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Compression Tester |
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PDehring
Bronze Level Joined: 06 Jun 2018 Location: Central MI Points: 93 |
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Posted: 13 Jan 2020 at 2:47pm |
I was looking to buy a compression test kit/tester but would like to have one that works well on the 301 & 426 engines. I know it needs to have a higher pressure rating (1000psi) for diesels but that's about it. I've never messed with one but I understand the concept of what is being done.
Anyone have a recommendation or a make/model that works well for these engines?
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1937 M Crawler, 1963 D21, 1964 D21, 1965 D12 SIII, 1970 220, 1976 185
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DougG
Orange Level Joined: 20 Sep 2009 Location: Mo Points: 7943 |
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Pretty sure - if on an Allis your good at 500 psi and less on a compression tester, seems I'm wrong- sorry!
Edited by DougG - 13 Jan 2020 at 5:48pm |
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Joe(TX)
Orange Level Joined: 11 Sep 2009 Location: Weatherford. TX Points: 1682 |
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A diesel compression tester needs to be 1000 psi. You will also need the adapter for the type of injectors you have.
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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DrAllis
Orange Level Access Joined: 12 Sep 2009 Points: 19472 |
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600 psi is enough on any A-C diesel engine. When you use the starter to check any 426, you'll be less than 400 psi. Your adapter thru the injector hole will be the same for 301 and 426 EXCEPT for those 301's and 4-cylinder turbo engines that have a copper injector sleeve in the cylinder head.
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PDehring
Bronze Level Joined: 06 Jun 2018 Location: Central MI Points: 93 |
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Is the adapter for a 301 & 426 a 'standard adapter' that would come in a kit or is it something more exotic?
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1937 M Crawler, 1963 D21, 1964 D21, 1965 D12 SIII, 1970 220, 1976 185
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DrAllis
Orange Level Access Joined: 12 Sep 2009 Points: 19472 |
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I made my own, so I can't tell you on that. I would think it could be very similar to some IH or JD engines injectors, but like I say, I don't know for sure.
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ACinSC
Orange Level Joined: 16 Dec 2015 Location: South Carolina Points: 2514 |
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Just checked my 40 year old Penske comp gauge out of curiosity . It goes to 300 . Never checked a diesel . Interesting post . Thanks
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SteveM C/IL
Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 7967 |
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Book proceedure for DDA was install tester and run engine. Don't remember speed. was time consuming for all 8.
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Lonn
Orange Level Joined: 16 Sep 2009 Location: Назарово,Russia Points: 29773 |
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If I remember right, you warm up the engine first then test at idle speed running while checking for each cylinder. Called a running compression check. I think we did this in school way back when. If so I know I never did it again but I'd think a running compression check would be more accurate than a cold cranking test (book would specify at what speed the engine had to be cranked at for that too IIRC) but maybe the repair manual would specify the correct pressure for one or the other...........................................Or I could be all wet and remembering things I never did at all.
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DrAllis
Orange Level Access Joined: 12 Sep 2009 Points: 19472 |
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Running is how AC wanted it done too, but if you are diagnosing a hard starting engine, a cranking compression test is better. AC provided no specs for this, so I compiled my own data. You'll find 350 to 375 psi with the starter is pretty normal for a used engine.
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SteveM C/IL
Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 7967 |
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LOL Lonn...I remember a lot of stuff that never happened
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