Question about Troy Bilt, Tuffy, Rear - Tine Tiller, 4.0 Tecumseh Engine

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Oil blows out of tube

I have a 8 hp tecumseh snow blower when running at full power it blows crank oil out of a breather tube next to carb any ideas

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You either have a head gasket going bad or your piston rings are shot which causes air to go down into the crankcase building up pressure which exits through the breather tube.

Posted on Feb 01, 2009

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mmm interesting.after comming up to temperature engine experiences excess blow by into crank case .doutfull if it has the wrong size rings for the cylinder as there would be other syptoms as well.think some thing is going on with the reed vave sticking open causing pressure build up into crank case

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Ran perfect last yr , gas was stale drained carb bowl and replaced gas it started up right away then cuople mins later it started blowing oil out of the oil over flow tube


Sounds like the Needle valve in the carburetor is stuck 'down' letting gas continually run from gas tank into carb. When the valve can't go up (Close) gas will run past the carburetor and into the crank case I bet your oil is full of gas. Check oil level see if it is overfull

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hello ,your engine is a tecumseh HMSK90-156525D, Sounds like carb. may need adjusting. Take the heat box off to expose carb. the heat box is the metal box surrounding the caeb., there should be 2 adjustment screws- 1 on the bottom of the bowl and 1 on the side of the carb just above the edge of the bowl ( depending how the carb sets off the engine - if the carb comes straight out it will be on the side facing towards the front of the snow blower or if it goes towards the handles then standing other side of the snow blower the screw will be facing you), turn both screws in til they just bottom out the turn them out 1 1/4 turns out then start the machine. While the machine is running at low idle turn the screw on the side of the carb. in (clockwise) a little at a time listening for the engine to start to rev up and then start to rev down, bog or studder then turn back slightly to bring idle back up. Once the idle is up then the screw on the very top of the carb. turn that out to lower idle to a normal idle. Repeat those adjustments till you cant get the idle to go up anymore. Now for the screw on the bottom of the bowl- move the throttle up to max and turn the screw in till you hear it rev up higher and starts to bog or sputter then turn it back slightly to bring the high rev to a smooth rev. That should take care of it. If it does not solve it then the carb may need cleaning then the adjustments done again. If you need more help on this please feel free to ask. Sometimes you have to do process of elimination and you start with the easiest first. Also the adjustments should help with the carbon build up on the plug.692509.pdf (application/pdf Object)
i have included the manual to give you a good understanding of the carb, page 7 to 25, hope this helps,don't forget the 4 thumbs up,any comments welcome,thank you.~~

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Runs good but oil is running out of carb


I would start by removing the valve breather, it is held on by 2 screws, and cleaning it with parts cleaner, blowing it out with compressed air and let it dry.

With the breather removed, you can spray parts cleaner through the long tube running from the valve breather to the carburetor.

You may also need to drain the carburetor bowl by removing the carburetor bowl nut located on the bottom of the carburetor.

If that does not help.The next step would be,Your breater or (PCV) valve is gone. Follow the hose from the carb breather to the crank case breather. There are two screws that holds it into the valve case. Remove and replace it along witht the gasket

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We have Tecumseh TSH 359/22272/81 motor on a Stiga snowblower. It did start and work but blew most of the oil out. Now it wont start. Where can I find new motor or parts, motor seems to have two axels...


Hi and welcome to FixYa. I am Kelly.

The fact that the engine blew out most of the oil during normal operation is an indication that there is a problem with the crankcase breather. You can usually resolve this by removing the breather from the side of the engine at the base of the valves and cleaning it with engine degreaser and carb cleaner. What I think happened was there was a bit of condensation in your breather and it FROZE in the closed position forcing the crank case to over-pressurize and porting the oil into the breather.

If by chance you over-serviced the engine oil before the last operation it will present the symptom you describe. Also if you tipped the unit more than 30 degrees.

It most likely will not start now from an oil fouled plug.

You can use this manual for locating "How to" repair your engine:
http://www.cpdonline.com/692509.pdf

Here is what the service manual says on page 82.

BREATHER PASSING OIL

1. Check the oil level, make sure the engine is not overfilled. Also verify that the viscosity rating on the container of

the oil being used is to specification.

2. Check the angle of operation. Avoid prolonged use at a severe angle.

3. Check the engine R.P.M. setting for excessive R.P.M. using a vibratach or other tachometer and compare it to the

R.P.M. settings found on microfiche card # 30 according to the engine model and specification number. Adjust the

high and low R.P.M. as necessary.

4. Check for leaking or damaged gaskets, seals, or "O"-rings. External leaks may not be evident; however, the leak

may prevent the engine from achieving a partial crankcase vacuum.

5. Check the breather for damage, dirty condition, or improper installation. The oil return hole(s) must face down.

6. Check the engine compression using a compression tester. If the engine has weak compression, determine the

cause of weak compression: worn rings, leaking head gasket, or leaking valves. Follow the compression tester's
procedure.

I can help more... the engine number you passed did not cross.

Thanks for choosing FixYa,
Kelly

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