Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

I have a craftsman 9 HP snow blower. It has a Tecumsehmotor…

Customer Question
I have a craftsman...

I have a craftsman 9 HP snow blower. It has a Tecumseh###-##-####motor on it. I had the carb rebuilt at a local small engine shop but when I started it up it "loaped" for a bit and then started spurting/back firing intermittently. There was also a glow in the muffler with the occasional spark.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Like what I thought I explained it pretty clearly.

Submitted: 2 years ago.Category: Small Engine
Show More
Show Less
Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I bought this snow blower second hand. I put the throttle linkages back into the holes they came from but I cant speak for the previous owner. The blower runs and operates but is not idling right. The sputtering/back firing is still present.
Answered in 37 minutes by:
2/27/2016
Technician: Curtis B., Technician replied 2 years ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,896
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
Verified

Carburetor is a none adjustable model. Only adjustment is idle speed. The needle valve and float, control the fuel flow into the bowl.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

With this engine, you may have a valve sticking or that needs to have some clearance. Problem with that, is the valves have to be removed from the block and ground off to add clearance.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I may have a valve sticking.
Technician: Curtis B., Technician replied 2 years ago

You can check valve clearance by removing the valve cover, that the vent hose comes off of, and see if valves are too tight. .006 will be good. Zero causes problems.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Service manual.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I have already found this online. I will look into it here and be back with you in a minute.
Technician: Curtis B., Technician replied 2 years ago

OK>

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Can you be more specific concerning the valve cover please
Customer reply replied 2 years ago
I looked through the manual before this conversation and just now and still have not seen a diagram/any other information that applies directly to what im after
Technician: Curtis B., Technician replied 2 years ago

Engine breather page 87, is where you remove and check valve stem and springs for clearance between valve stem and lifter.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
ok thanks i will look into that quick here
Technician: Curtis B., Technician replied 2 years ago

OK>

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
basically I'm going to have to take apart the whole motor to see if the valve may by flush or may not in which case I would be back at square one?
Technician: Curtis B., Technician replied 2 years ago

You can check them, but not adjustment them without disassembly!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I have a side mounted breather. Such as in Figure 49 on page 87 but after taking it apart I still dont understand how this helps me. I dont see any valve such as in the other diagram.
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

#172 is the cover shown for your engine, the cover and baffle have to be removed, and you should them see the valves and springs and lifters

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Take it off, go deeper!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
ok i will be back in a minute
Technician: Curtis B., Technician replied 2 years ago

OK>

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Thats it. The valve stems and the lifters, You want to measure the gap between stem and lifter. Use feeler gage and see if you can slip at least .004 between the two parts, you will have to turn engine until the valves are closed,

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I dont have a feeler gage. perhaps I can get one tomorrow?
How do I turn the engine with that sort of accuracy?
And you know when they are closed because they are in the lowest position they can be?
Technician: Curtis B., Technician replied 2 years ago

Accuracy is not that close. You can turn engine and hold gage against the two parts, if there is clearance ,the gage will slip through when valve reaches its lowest point. As long as it has clearance it should work, and not cause the misfire. Zero is when it causes the problem/

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Im sorry and maybe im being dense but I still dont fully understand where exactly Im supposed to be measuring.
Customer reply replied 2 years ago
or with what. I dont have a feeler gauge
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Here is Utube video.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
if I can get a feeler I can check that.
If it does not have clearance than I need to take the head off. Remove the stem and grind it down a bit.
What if it does have clearance?
Customer reply replied 2 years ago
I will have access to a feeler gauge tomorrow.
Technician: Curtis B., Technician replied 2 years ago

You can still have valve problem, valves may not be seating, and would need to be reseated.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

I will be here tomorrow , most of the day. Let me know what you find with clearance.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
ok how do I contact you? I have not used this before.
Technician: Curtis B., Technician replied 2 years ago

There will be a link in your Email to get back.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
ok cool.
Technician: Curtis B., Technician replied 2 years ago

Good night!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Ok so here are some pics of when the stems are up. Even when the stems are up there is no gap. they travel through the bottom.
Also I removed the belt cover to be able to turn the shaft easier and I noticed that at a certain point it became very hard to rotate. There was a good deal of resistance. It will of course make the full rotation.
Technician: Curtis B., Technician replied 2 years ago

Only time there would be a gap is when the valves are all the way down. When you were turning engine, did you have spark plug removed? If not you were feeling the compression. But with no gap, the valves need to be (adjusted).

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I watched the youtube video 3 more times and the best I can see is that the stems in the video stops before the bottom of the box. He slides the feeler gauge between the bottom of the box and the bottom of the stem to get the measurement. However in my case as shown in the pictures, the stem goes through the bottom of the box. I took the picture while the stems are up to illustrate this. Or am I missing something?
Customer reply replied 2 years ago
Its also my understanding that I could also take the engine apart and see if the stems rotate. If one or both of them do then I would know that they are sitting against the bottom and need to be ground down. Right?
Technician: Curtis B., Technician replied 2 years ago

The bottom part of the (stem) is the lifter, the upper part is the valve, you have to measure the distance between them, Take a screw driver and lift up on the valve spring to see the gap. Then you will know where the measurement is made, between the two parts!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
OK I think I have a bead on it now. When the lifter presses up of coarse there would be no gap. Im going to go get the gauge and check it.
Technician: Curtis B., Technician replied 2 years ago

Correct!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
One of the things that confused me is that in the youtube video the lifters are flush with the bottom but with mine they are elevated. I found the separation point and will be proceeding to the store shortly to get a gauge. My gut reaction is that they are flush but I cant be sure till I get the gauge. If that is the case then I have to pull it apart, get the head off, get a spring puller and remove the springs to remove the valves and then grind them down a tiny bit. Presuming that this will be the outcome how would you advise I grind them down?
Customer reply replied 2 years ago
Do you think I will need to replace any gaskets after the disassembly? Such as for the head?
Customer reply replied 2 years ago
Or are they usually reusable if you are careful?
Customer reply replied 2 years ago
I got the feeler gauge and could not get even the smallest between them. As per my previous questions, how do you think I should go about grinding down the valves?
Customer reply replied 2 years ago
I tore down the motor. After seeing the piston and placing it at the top I still could not get the .008 gauge between the two. However the two valves do not turn when closed like in the youtube video. They appear to be flush on top and only are able to be turned when up. I would assume that the valves still need to be removed and ground down?
Technician: Curtis B., Technician replied 2 years ago

Yes, until you can get the proper clearance, Do NOT take but a slight amount at a time, and while valves are out, reseat the valves in the block.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
I have been doing research and I do not have the capacity to grind them down with the accuracy and fine finish that I have found it will require to work properly. I would need a machine shop to do the job right from what I have been reading. I noticed that when asked you did not have any instruction as to how to grind them down only that they needed it. This forum would appear to be geared toward the novice which in my opinion is really not equipped for that sort of modification. It is my feeling that my $18 would have been better spent if you had simply outlined the whole of the process, giving me the opportunity to see the pitfall and just take it to a shop before taring it down to asses a problem I was ill suited to fix. That being said I have found your patients to be good albeit fruitless. I am either going to take it to a shop in pieces and see if they would like to finish it with their compliment of tools or pass it off for parts or repair in a auction or something. This is the end of the project for me. next time I will just spend more and take the rest of the day off. I would have gladly paid $18 for someone to tell me not to attempt this and saved me half a day, which I think would have been well worth it.
Technician: Curtis B., Technician replied 2 years ago

I sent the service manual. That is all the help that you should need to get the basic points. You can grind the valve tips with a sharping stone or a good file, they don't have to be perfect.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

I work out in the country and always try t figure out how to do it , without having to go to town! Like i'm stuck in the desert and have to get home! Good luck with it! Thanks,

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Please accept to close!

Ask Your Own Small Engine Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Curtis B. Your Own Question
Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,896
31,896 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

Curtis B. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

31,896 satisfied customers

have worked on and around most engine models for 35 yrs./Polaris ATV expert

Rick

Rick

Factory Authorized Trainer

4,218 satisfied customers

Outdoor Power Equipment technical trainer since 1990, covering eight states.

Jon K.

Jon K.

Small Engine Diagnostic Expert

2,995 satisfied customers

Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines

James W

James W

Small Engine Troubleshooting Expert

2,986 satisfied customers

7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

Vince O.

Vince O.

Small Engine Technician

2,927 satisfied customers

Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers

Wayne

Wayne

Engine Rebuilder

2,041 satisfied customers

many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines

RUSS

RUSS

SERVICE TECHNICIAN

1,723 satisfied customers

28 YEAR SERVICE TECHNICIAN

< Previous | Next >

Related Small Engine Questions
Craftsman snow blower model with tec. modelthat when trying
Craftsman snow blower model with tec. model###-##-####that when trying to rope start after three pulls back fire thru exhaust. I have replaced the coil and key too in flywheel. Carb has been rebuilt. … read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
2,041 satisfied customers
I have a chance to purchase a never been used 2002 1028 STE
I have a chance to purchase a never been used 2002 1028 STE snow blower for $900 dollars. Is this a reliable machine, what type of performance can I expect. What was the purchase price back i 2002. Ha… read more
Briggs-Fan
Briggs-Fan
1,280 satisfied customers
Hi. As per your advise on the snow blower problem,
Hi. As per your advise on the snow blower carburetor problem, i decided to change the carburetor. I placed the order and i should get it delivered tomorrow. Is there anything i should watch for? Or so… read more
Briggs-Fan
Briggs-Fan
1,280 satisfied customers
I need to replace the engine in my craftsman snow blower.
I need to replace the engine in my craftsman snow blower. It is a Briggs & Stratton engine, Model # XXXXX Sears says that B&S no longer makes the engine. Is there a comparable model that will fit? It … read more
Briggs-Fan
Briggs-Fan
1,280 satisfied customers
I have an older Snapper snow blower, model 10302, with a 10
I have an older Snapper snow blower, model 10302, with a 10 horse Tecumseh engine. My throttle linkages are not right. It will start and idle but the throttle lever has no effect on the engine speed. … read more
Briggs-Fan
Briggs-Fan
1,280 satisfied customers
I have a large Sears snow blower with a Tecumseh engine. There
I have a large Sears snow blower with a Tecumseh engine. There are two electrical grounding interlocks. One on the throttle and on near the starting quadrant where you must insert a plastic key. Both … read more
Chris
Chris
Senior Mechanic & Technician
Factory Training
826 satisfied customers
I have a Toro Mower Model 20692 that I have owned for about
I have a Toro Mower Model 20692 that I have owned for about 25 years. This is the first year I've had problems with it. Gas seems to be leaking from the muffler until the gas tank is empty. Last time … read more
Vince O.
Vince O.
Small Engine Technician
High School or GED
2,927 satisfied customers
I have a Craftsman snow blower 208cc 26inch cleaning path.
I have a Craftsman snow blower 208cc 26inch cleaning path. model #247.886910 i just purchased used. It was used last year about 4 times due to no snow last year. It started right up on choke but when … read more
Jon K.
Jon K.
Small Engine Diagnostic Expert
Some College, military training,
2,995 satisfied customers
I have a Sthil BR320 back pack blower. Problem is when full
I have a Sthil BR320 back pack blower. Problem is when full power is applied, engine sputters then stalls after about 3 seconds. If open carb a bit, engine runs ok. Replaced carb with new one (not reb… read more
Jon K.
Jon K.
Small Engine Diagnostic Expert
Some College, military training,
2,995 satisfied customers
I have a craftsman snow blower m#536.881851 and it will only
I have a craftsman snow blower m#536.881851 and it will only run for less than a minute and stalls. I changed spark plug, new gas, oil is fine. I bought a new craftsman beacuase I only by craftsman to… read more
Bluextc89
Bluextc89
Owner
Vocational, Technical or Trade Scho
243 satisfied customers
I have an ariens 11528 snow blower. It was running great this
I have an ariens 11528 snow blower. It was running great this morning, but started sputtering and shut down.Now it doesnt seem to be getting fuel. I put a little gas in the sprak plug and it fired rig… read more
Rick
Rick
Factory Authorized Trainer
Vocational, Technical or Trade Scho
4,218 satisfied customers
I have a tecumseh snow king 9hp. Model LH318SA, spec 156587H. Got
I have a tecumseh snow king 9hp. Model LH318SA, spec 156587H. Got about 5 hours on it or so and I got new gas in it, clean plug. Yet it starts right up but pops and back fires with an uneven idle. Do … read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
Got a sears 24 snow thrower with a Tecumseh 5 hp engine.
Got a sears 24 " snow thrower with a Tecumseh 5 hp engine. Dies under heavy load. Will move and throw some snow but under full moving and throwing it sputters and dies. Will restart with some effort. … read more
Vince O.
Vince O.
Small Engine Technician
High School or GED
2,927 satisfied customers
I have a craftsman snow blower with a 5.5 hp tecumseh overhead
I have a craftsman snow blower with a 5.5 hp tecumseh overhead valve engine. ModelNNN-NN-NNNNserial XXXXXXXXX It bacfires and wants to pull the recoil rope out of your hand. We have good spark and we … read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
I have a craftsman snow blower with a Tecumseh LH3185SA engine
I have a craftsman snow blower with a Tecumseh LH3185SA engine could please help me the adjustment screw for the carberator. I can not get the engine to run steady. I have already replaced the spark p… read more
RUSS
RUSS
SERVICE TECHNICIAN
Vocational, Technical or Trade Scho
1,723 satisfied customers
I have a Craftmen Snow Blower Model number 247.886640 / SN
I have a Craftmen Snow Blower Model numberNNN-NN-NNNN/ SN: 1H302B40143 with a 5 HP Tecumseh engine (model #:NNN-NN-NNNN The shaft dimensions are as follows: from face of engine the total length includ… read more
James W
James W
Small Engine Troubleshooting Expert
Bachelor's Degree
2,986 satisfied customers
I have an 8 horsre tecumseh on a john deere snowblower. It
I have an 8 horsre tecumseh on a john deere snowblower. It idles very eraticly and keeps stalling. The last time I used it the muffler started to glow red! Any ideas or suggestions to get it running b… read more
Dan Oostdyk
Dan Oostdyk
Vocational, Technical or Trade Scho
89 satisfied customers
Craftsman push mower runs OK for 5-10 minutes. After it warms
Craftsman push mower runs OK for 5-10 minutes. After it warms up it will start to sputter and die when cutting. If I tilt it up or move it to flat surface when it starts to sputter the engine picks ba… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x