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Research
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Posted by popcornhill (My Page) on Thu, Sep 2, 10 at 19:32
Since it seems to be slow going on here right now it might be a good time to research a project I plan in about a month. And that would be to change out a leaking gasket on a 11hp briggs and strattion engine.
Model 252707 Type 0624 01 Code 87012110
It leaks enough to be a mess under the tractor after a couple of days. The oil is coming from a bolt on the under side. I believe that holds the slump tank on. Also a little oil shows coming from the head gasket. I have tightened the bolts.
I have the illustrated parts list for this engine. There seems to be two major gaskets: Head gasket and crankcase gasket. Is there a slump gasket or it that the same as a crankcase gasket?
As usual...any help greatly appreciated.... |
Follow-Up Postings:
RE: Research
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- Posted by canguy British Columbia (My Page) on
Thu, Sep 2, 10 at 20:21
| If oil is leaking from the head gasket, the engine is either overfilled or parked at a serious nose down attitude. |
RE: Research
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| Pop: Are you experiencing any unusual Oil Consumption or excessive smoking upon start-up ? Could be Blow by (rings) or Valve Seals and residual (gas/oil) leakage via the Head Gasket Deterioration . Otherwise I would concur with CG and the Overfilled Issue . As far as Crankcase and Sump can be synonyms but there is the Cylinder base Gasket on numerous Models also as opposed the the Head Gasket. You have not indicated the State of Repair or Performance of the Engine . Is the Spark Plug Indicating any of the Symptoms of the cause suggested ? You may wish to remove the Head to validate same . Perhaps a Compression Test 1st ? You know the History of the Unit Best ! :) |
RE: Research
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| Tks canguy and ewalk. When I bought this WH tractor it was not running and was very oily and dirty underneath. I took it apart, cleaned, painted and reassembled. It runs good after I got over some electrical problems. No smoke and it is not using oil. As I said, it is just leaking some oil out that makes me think it needs a new gasket. And from canguy's comment I think it is the bottom gasket. The tractor is not a worker. It is a grand kids ride and a growing hobby for me. |
RE: Research
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| Pop: Spray some carb cleaner (know you have some lol ) on the engine oily surface area for decreasing to determine exact location , since oil can creep and sometimes make source a little tricky. Also snug up all fasteners involved. Since your not experiencing any noticeable oil consumption its just residual , but probably could start to mess up your nice clean garage floor. Should gasket replacement be necessary , don't hesitate to go with liquid gasket method should OEM gaskets be hard to locate . Loctite is making great Product within this requirement . I always try to replace with Graphoil Product but they make be a little to much $$ for your application . Hope You and the Kids enjoy the Ride and Hobby :) |
RE: Research
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| Will do ewalk. By liquid gasket, are you talking about something that I would just pour into the oil such as stop leak? I never thought about that. Also I ran across this on an old tread. "The most common place for oil leaks is the sump/crankcase cover gasket. A torn gasket will allow oil to escape. A common cause could be a blown head gasket putting too much pressure in the crankcase." So I think you are correct in the dual name sump/crankcase gasket. But my problem is not that large yet. Your suggestion of a liquid gasket will probably fix me up. Which store would carry this product? Tks |
RE: Research
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You can't use "liquid gasket" to replace the sump gasket because the gasket is also a "spacer".
The gasket is offered in 3 different thicknesses.
.015" standard, .009", and .005".
The appropriate thickness gasket is chosen after first assembling the sump to the crankcase WITHOUT a gasket (or the crankshaft oil seal) in place and then measuring the amount of "end play" that exists between the crankshaft and the crancase/sump assembly.
Or.......you can just use the same thickness of gasket that you are replacing, but the gasket needs to be measured with a micrometer to determine which gasket it has now.
If you order the gasket from a small engine shop, the service department should be able to tell you which gasket you have. And no, the liquid gasket product is not something you add to the oil. It is a product that can be used to replace OEM gaskets in many locations on an engine, but this type of sump gasket, and head gaskets, do not fit into the list. And one more thing, your engine is a "flat head" or L-head design. A leaking head gasket on this type engine will not pressurize the crankcase, it will leak to the "outside" of the engine if it blows, and you probably would have no trouble seeing that! It would be a compression and combustion leak, not an oil leak. |
RE: Research
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| OK..three different sizes on the the crankcase gasket. When I check on the gasket sets, I see three crankcase gaskets and I could not imagine where they would go. So I guess they send the three different sizes and you use the one you need. That makes since. Also, now that I think about that little leak, it comes from a bolt that is recessed and also not on the edge of the pan. Closer to the middle of the pan. When I had the engine off, I cleaned the bolt...let it set a day or two...and had to clean it again. And those gaskets do not look like they would have anything to do with that bolt.?? After remounting the engine I can no longer see the bolt, but the oil sort of oozes out. |
RE: Research
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| Popcorn: Good to see you have narrowed down the origin of the leak . Does the Hex head fastener (bolt) not have a o-ring or or fibre washer or gasket ? Also the "Liqiud Gasket" Is a gasket sealing Product. Used for yrs in Europe on Mercedes and Bmw ..etc. Made it way to the North American Market in the 80's. I have used it as a gasket dressing on troublesome thermal cycle leakage applications and also by itself on intake , base and various valve cover and oil pan applications. Not recommended for Heads for obvious Pressure and temperature reasons. As for Liquid additives for oil consumption don't believe in them . I have faith in Top end Lubrication and Clean Products but for Stop Leak Products Power Steering Additives is as far as I have found any success on Dry Seals causing a Problem . Sorry just back in from Setting up Deer Camp for the Bow Season , would have answer you sooner Bro ") |
RE: Research
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| Hey ewalk don't worry about the timing....that's why the repair will be later on. Just getting ideas on it now. You know when I had the motor off and saw the oil on that bolt, I tightened it without ever taking it out. So I am not sure what sort of washer or sealer is on it. That is a place to start for sure when I take the motor off again. Yesterday my two in-town grand kids came over and rode that tractor until after dark. It never missed a beat and used very little gas! They really enjoyed it...almost as much as I did watching. I have a S-I-L that bow hunts. I don't do the hunting but I do help with the hamburgers etc. Have a good deer huntin season ewalk. |
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