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I have a Craftsman YTS 3000 21 HP &S engine model #917-289244

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I have a Craftsman YTS...
I have a Craftsman YTS 3000 21 HP B&S engine model #917-289244 serial#040-810D010741. It has an oil leak at the bottom crankcase split of the block. It had this problem during warranty and the gasket was changed, but that did not correct the problem for long. Now that the unit is out of warranty I would like to try and repair the problem myself. Can you give me any idea as to what may be creating the problem? I was a service rep. for OMC for 24 yrs and I am not unfamiliar with issues that come up from time to time in manufacturing. I would like to know if an Anerobic sealer may work better than the gasket? Are the parts out of spec.? I have machinist abilities to put that in order if I knew what was needed. I can just go it alone if I can't get any ideas from you, but someone must know something about this issue. Thanks for listening.
***** *****
Submitted: 2 years ago.Category: Small Engine
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Answered in 10 minutes by:
7/7/2015
Technician: Donald, Small Engine Technician replied 2 years ago
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,217
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
Verified
Hello and thank you for choosing Just Answer. My name is ***** ***** I will do my very best to get you the answer you need to your question.
Do you have the model numbers for your engine? Model and Type numbers.
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Customer reply replied 2 years ago
Donald, I am looking at the engine and it has no other markings on it other than what was under the seat on the mower. I figured that was the chassis number, but found no others. Where might they be located on the engine?
Technician: Donald, Small Engine Technician replied 2 years ago
There will be a shiny cover on the rear of your engine, with OHV stamped in it. Your model, type, and code numbers will be engraved in the top of this cover.
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Customer reply replied 2 years ago
Hold please!
Technician: Donald, Small Engine Technician replied 2 years ago
No problem Dan ...
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Customer reply replied 2 years ago
I do not have that availble to me as I thought at this moment. The mower is 2 yrs old. Can you give me any general info as to what the problem might be? I am going to dis-assemble the engine and may find the problem on my own. Just was looking to see if a gasket material change had been made or if any parts were out of spec keeping the case from closing completely.
Technician: Donald, Small Engine Technician replied 2 years ago
Dan, I would like to make some suggestions.
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Customer reply replied 2 years ago
OK, shoot!
Technician: Donald, Small Engine Technician replied 2 years ago
The most common reason for gasket leaks in this area of your engine, is due to your bolts loosening, and slightly backing out, due to vibrations during normal operation. I do believe that if you thoroughly clean your oil sump, and crankcase mating surfaces, your OEM gasket will work for you. Clean your bolts and bolt holes, and put some Blue - Medium Strength Loctite on each, to secure them.
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Technician: Donald, Small Engine Technician replied 2 years ago
Would you like to have the torque specs for your bolts?
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Customer reply replied 2 years ago
According to the technician who last fixed the mower this was done. Now I have no way of checking the quality of his work. I did demand to meet the repair person after it failed again (from Sears) and I was not impressed with his shop or credentials.
Yes I would like to have the torque specs. Thank you, Donald!
Customer reply replied 2 years ago
If there nothing else going on with the engine I will be happy to just replace the gasket and torque the bolts with blue loctite.
Customer reply replied 2 years ago
Does the gasket require any adhesive of any kind?
Technician: Donald, Small Engine Technician replied 2 years ago
Briggs and Stratton does not recommend using an adhesive. I personally do not use it either. I just make sure both surfaces are totally free of old gasket material. I also make sure mu surfaces are true. I am gathering your torques specs.
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Technician: Donald, Small Engine Technician replied 2 years ago
Click on the link. Let's see if it opens for you.
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Customer reply replied 2 years ago
I will make sure the surfaces are true including any raised areas if the bolt holes were over torqued. I will also straight edge the entire surfaces to make sure they are true. That gasket doesn't look to be much more than newspaper, but I haven't had one in my hand yet. I am use to two strokes.
Technician: Donald, Small Engine Technician replied 2 years ago
I understand. It is not very thick, but it is the actual recommended gasket. I do believe this will work out for you. I have been personally running one of this series of engines for over four years, without leaks.
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Technician: Donald, Small Engine Technician replied 2 years ago
As long as your bolts remain tight, your gasket should not leak.
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Customer reply replied 2 years ago
Yes it did, 220 lb-in. Thank you very much, Donald. Let's hope this puts this to rest. I should be able to just lift the sump off without disturbing any other comonents, right. Again, I am a two-stroke guy so we don't have all those valves, cam, and timing to keep up with. Thanks so much for your help. I'm pretty sure I can do this.***** *****
Technician: Donald, Small Engine Technician replied 2 years ago
You are very welcome! Yes you can lift your sump without disturbing your internal parts. Just watch for your Governor Gear. It seats on top of your cam gear. You do have mechanical experience, so, yes you can do it. Just take your time.
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Technician: Donald, Small Engine Technician replied 2 years ago
Dan, I am also attaching a link to a free service manual for you to use. It will cover your engine. Service Manual - Click Here
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Customer reply replied 2 years ago
I don't know how, but I ended up getting an email from two techs. Curtis B. and you Donald. You both basically told me the same thing except he (Curtis B.) told me to use aviation cement (Permatex) on both sides of the gasket. I know what you said and I am familiar with this adhesive, just wondered who is correct? I have the copy of the service manual and will be checking to see what is recommended. The model #331877 type #1371 it turned out to be. I have an OEM gasket #697110 on the way. Thanks for all your help. With the manual I do not think I will have any problems.
Dan in TN
Technician: Donald, Small Engine Technician replied 2 years ago
Hello Dan. I have rebuilt several Briggs and Stratton engines over the years, and I have never personally used a sealant on sump gaskets. Curtis is very sharp, and does have advanced knowledge of small engines. If he recommended, using aviation cement, then I am sure it will work for you.
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Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13,581
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Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

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