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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

How to check compression on diesel engine

Author  [Modern View]
Brad in WI

05-30-2008 15:34:02
24.208.60.64



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What is the easiest way to check the compression on the diesel side of an MD. I know using a gauge for a diesel is a good start but how would I insert it into the injector hole and have minimum leakage. Any advice on this is good advice as I am stumped. I can check it on the gas side by threading into the spark plug hole and checking like that. I will not get a reading with out the diesel injectors in place though and they are removed currently.

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Janicholson

05-30-2008 20:42:54
64.83.197.176



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 15:34:02  
Find or make an adapter that will allow your Gas compression gauge to be placed in the Injector hole.
Leave the plugs in, set it to gas side operation and crank it All pressures will be equal in a closed system, so it will be as if the injectors are in. JimN



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the tractor vet

05-30-2008 17:17:01
76.212.239.147



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 15:34:02  
To do a proper comp. test ya have to remove the injectors clean the injector well and have the proper fitting that looks like a injector and use a new sealing ring and torque it in just like you would when ya install the injector. then you hook up your gauge and turn the engine over. Then move to the next hole.



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Brad in WI

05-30-2008 19:44:37
24.208.60.64



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 Re: How to check compression on diesel engine in reply to the tractor vet, 05-30-2008 17:17:01  
is there another way I could check for compression? I am sure that I do not have anything near what I need to do it somewhat properly.



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the tractor vet

05-31-2008 14:26:40
76.212.239.147



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 19:44:37  
The only thing you can check with out the proper tools is the comp. on the gas side ain't no other way . Go find and old injector and gut it and install a fitting into it then you can do the job wright.



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billde

05-30-2008 16:24:13
72.26.91.191



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 15:34:02  
keep the injectors in, close the decompression valves, check just like it was a gasser. Bleed off fuel beforehand.



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Allan In NE

05-30-2008 15:47:57
148.78.243.26



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 15:34:02  
Down, fast and dirty.

If it's getting fuel and air but won't start, it probably has bad compression.

Allan



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Brad in WI

05-30-2008 19:43:33
24.208.60.64



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 Re: How to check compression on diesel engine in reply to Allan In NE, 05-30-2008 15:47:57  
one would figure that ;) but how do I tell if the injectors are out now and I do not have an injection pump yet.



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TomA

05-31-2008 15:18:10
64.118.118.129



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 Re: How to check compression on diesel engine in reply to Brad in WI, 05-30-2008 19:43:33  
Cat does not use a compression check to diagnose engine problems. They recommend a leak down test. I made a leakdown tester from an air blowgun and 1/4" pipe fittings. Tee in a pressure gauge. Set the cyinder at TDC and put it in gear or lock the engine somehow. Pressurize the cylinder through the injector hole. I used the tip off of a gas compression gauge which fit on a 1/4" pipe nipple. You can easily hold it against 100 psi.

Use your compressor to presurize the cylinder to your max pressure. Shut off the air and see if it will hold. If air leaks try to locate where it is going. Intake or exaust manifold indicates valve. Into crankcase, piston or rings. Or into the dreaded cooling system may mean cracked head.

Tom

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