How JustAnswer Works:

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

Ask Gil Your Own Question

Gil
Gil, Small Engine Technician
Category: Small Engine
Satisfied Customers: 37
Experience:  Master Service Technician for Kohler Motors. Certified Marine and Outdoor Power Equipment Technician
10094475
Type Your Small Engine Question Here...
Gil is online now
A new question is answered every 9 seconds

I have a Briggs and Stratton model 124702 /type 316701 ...

Customer Question

I have a Briggs and Stratton model 124702 /type 316701 that runs good, but hard to start, and uses a lot of oil, the air filter, oil,plug was changed. when used for a while it starts better but smokes a lot. My compresion guage is in for repair. What is your opinion of the problem It seems that the rings are stuck or worn.I fyoiu agree that therings are bad, I woulod like to know the procedure. Thank you     Jeano in Alaska
Submitted: 6 years ago.
Category: Small Engine
Expert:  Gil replied 6 years ago.

Hello Costa Rica 2

It certainly sounds like you may have a ring problem. It could also be that your cylinder head is carboned up and there is carbon built up around the valves. You may also have wear in the valve guides or you may have a loose valve seat. Is the motor very old? You could get an idea of compression by taking out the spark plug, putting your thumb over the hole and spinning the flywheel. The compression should be enough to pop your thumb off the hole.

You probably should pull the head off the motor and take a look at the cylinder. Check for any scoring or wear on the cylinder walls. Check to see how much movement the piston has from side to side in the cylinder. Check to see how much carbon is built up around the valves and in the cylinder head. Pull the valve or breather cover off and check the valve clearances. You should have about .007" on the intake and .011" on the exhaust when the piston is about 1/4" past top dead centre.

If there is any damage to the cylinder walls you may find that replacing the motor is the best option. However, everything else can probably be fixed if you are willing to try.

Let me know what you find in the visual exam and we can go from there as to the procedure etc. Do you have a Briggs and Stratton dealer somewhere near you to obtain parts?

Gil

 

Customer: replied 6 years ago.
Reply to Gil's Post: Hi Gil    thanks for the gey back.
Can you give me a short version on reringing. I am an old auto motive mechanic.
Thanks    Jeano
Expert:  Gil replied 6 years ago.

Hi Jeano,

All you have to do is clean off the end of the crankshaft and then remove the crankcase cover and the cylinder head. Note the timing marks on the camshaft and timing gear. Remove the cam shaft so you can get at the rod cap. Make sure you mark the con rod and rod end cap on one side with a centre punch before removing. Rotate the crankshaft to get at the rod cap bolts. Remove the bolts and rotate the crankshaft to push the con rod and piston up the cylinder. You don't need to remove the crankshaft from the motor. Push the piston out the top of the cylinder. Make sure you mark the exhaust side of the piston if it is not already marked. Remove the old rings. Check the new ring in the cylinder and check the end gap. Make sure the gap is within specifications.

Install the new rings in the order specified. The rings should come with directions as to which ring is which and which way up they go. If you have a ring expander all the better for installation. Check the cylinder. Do not hone the cylinder as it is an aluminum bore. You will do more harm than good.

I think you may run into a problem with installing the piston back into the cylinder if you don't have a ring compressor which is small enough. Install the piston with the marked side to the exhaust. Be careful with the rod as you come through the cylinder not to bang anything or scratch the cylinder. Be careful not to jam the rod onto the crank. Replace the rod end cap matching your marks. You will need some lock tight for the rod bolts. Apply the lock tight and torque the rod bolts to 100 inch/lbs. You will need a small torque wrench to get in the tight fit. Re-install the cam shaft matching timing marks. Clean off the crankcase and fit new gasket. I usually just grease the gasket first. I usually replace the pto seal if I've had the cover off. For the price it saves putting it back together and then having to pull it apart again cause the seal starts leaking. Once the new seal is in then replace the crankcase cover being careful of the governor mechanism and the oil slinger. As you re-install the cover, keep an eye on the timing marks. Some of the motors have a tendency to jar a little when the cover is almost on and this kicks the timing gear over one tooth. The cover bolts should be torqued to 90 inch/lbs. Replace the head gasket and torque head bolts to 150 inch/lbs.

Hope this helps. Let me know if you need part numbers or anything.

If this answers your question completely then please click on the green Accept button. If you have any more questions or need clarification, please let me know.

Gil

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. Jimmy Bagley, IA
< Last | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • http://ww2.justanswer.com/uploads/SM/SmEngPro/2012-8-5_3564_Rick1206290005Edit.fullres.logo.scrn.64x64.jpg Rick's Avatar

    Rick

    Factory Authorized Trainer

    Satisfied Customers:

    4126
    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • http://ww2.justanswer.com/uploads/GI/giftindex/2011-11-19_2715_JamesLWells500.64x64.jpg James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    2978
    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    2950
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/MR/mr2cycle/2011-3-12_03458_sears.64x64.jpg Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    2374
    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • http://ww2.justanswer.com/uploads/rheisnger/2010-12-31_010856_41385_100001225699183_7012_q.jpg RUSS's Avatar

    RUSS

    SERVICE TECHNICIAN

    Satisfied Customers:

    1723
    28 YEAR SERVICE TECHNICIAN
  • http://ww2.justanswer.com/uploads/BriggsEngines/2010-02-26_230200_n1834842973_4823.jpg CJBennett's Avatar

    CJBennett

    Small Engine Technician

    Satisfied Customers:

    623
    Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.
 
 
 
Chat Now With A Technician
Gil
Gil
37 Satisfied Customers
Master Service Technician for Kohler Motors. Certified Marine and Outdoor Power Equipment Technician