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451 turbo with bad blow-by


 
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Brokengun
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PostPosted: Mon Jul 26, 2010 6:27 pm    Post subject: 451 turbo with bad blow-by Reply to specific post Reply with quote

I am looking at an 1175 case tractor. I noticed that there is a lot pressure coming from the breather tube.

The breather tube is the tube that sets on top of the valve covers.

There shouldn’t be pressure on this tube but it feels like a compressor pumping air.

Normally my first thoughts are that a head gasket is blown or there is blow-by from worn compression rings.

But the engine runs fine, does not smoke and there is NO water in the engine oil or extra pressure on the radiator.

Normally an engine with this much pressure would smoke badly or have water in the oil.

Instead it starts and runs fine.

Any ideas?

The engine is a 451 turbo charged engine.
 
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MDMO
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PostPosted: Mon Jul 26, 2010 6:41 pm    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

Possible bad valve spring or valve
 
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olgentdc
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PostPosted: Mon Jul 26, 2010 7:45 pm    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

DO THE CHEAP STUFF FIRST. Speaking from HARDKNOX Mechanix Sckool... . pull the valve covers , LOOK CLOSELY AT EACH VALVE SPRING,anything that does not look perfectly right as the others is the culprit,, you can change out valve spring with air pressure thru the injector port, JUST MAKE SURE THE PISTON IS NEAR TOP OF STRoKE .. , and while there look for moisture gonky goop on the valve covers ,,. if water filth present.. you have a blown head gasket OR WORSE a cracked head .. should run a compression check at injector port to be able to tell which head set is the problem ..check the injectors for proper spray pattern while they are out ,,BAD INJECTORS HAVE sidelined and sometimes RUINED MANY GOOD ENGINES BY CEASING THE RINGS IN THE SLEEVE . Diesel mechanic up the road told me . Pencil injectors have a life of 20 years regardless if they are running or setting,,. don't know if thats really true in all tractors using pencil Injectors..but seems to be from my shop .
 
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case trader
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PostPosted: Tue Jul 27, 2010 3:33 am    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

i will agree with j on the easy stuff first but that said i generaly find if tractor runs fine starts good uses very little oil the second ring will be broke thus scoring liner i"ve run them all summer thinking it might get better but in the end nock out the pistons have had as many as 4 pistons w broke rings i blame it on starting fluid (go to a tractor auction and watch the help try to start tractors)bad valves w/push compression in ex. or intake.
 
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dwag
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PostPosted: Tue Jul 27, 2010 3:57 pm    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

451 turbo is known for blow-by, and prone to cracked/broken crankshafts in our area. This tractor could be dealing with an issue of moisture in oil due to long time of non use and "boiling off" moisture in crankcase. That said, moderate blow-by is a non-issue. I'd screw it down on a dyno before purchase.
 
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Agri King
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PostPosted: Tue Jul 27, 2010 6:11 pm    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

Broken crankshafts is not at all common.
 
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Agri King
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PostPosted: Tue Jul 27, 2010 6:25 pm    Post subject: Re: 451 turbo with bad blow-by Reply to specific post Reply with quote

There are proble broken piston rings and worn valve(s) seats and guides, it's and old tractor. If it doesn't have a miss or rattle and has good oil pressure....... Run it. Case tractors seem to breath heavy anyways, compared to the lesser red and green colored tractors.
 
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