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Allis Chalmers Discussion Forum

AC diesel engine compression check

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week N warrior / MO

01-03-2004 08:56:30

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I have an Allis Chalmers 11000 diesel engine that I'm going to have to pull to replace the oil pan. Before I do I want to check the compression to see if I need to go though the engine. The overhaul kit is about $1600 so I don't want to do it if not needed. The engine will only crank if starting fluid is sprayed in it first. Then it seems to run good but won’t idle. Injectors probably need cleaning. I thought all diesel engines had Glow plugs. But I don't see any on the engine. Does it not have them? How would I check the compression? Though the injector holes? Anyone know what the compression should be for this engine? I have the Owners, Shop and Parts manuals and none of them say what the compression should be. Nor do they minion Glow plugs

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01-15-2004 14:47:26

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 Re: AC diesel engine compression check in reply to week N warrior / MO, 01-03-2004 08:56:30  
just performed a compression test on my hd16 allis dozer. i had a machinist make me a hollow shaft off a pattern of one of the injectors. had to buy a 1000 lb guage and a screw on hose with a valve stem made in it to attach to the end of the tester. worked fine. my compression on this engine was 415lb and was within specs. what you look for mostly with this test is a big difference in compression from one cylinder to another. for instance a 30psi or more would be a concern. i hope this helps some. i want to add that you can use an old or scrap injector that is the right size for the engine to make a tester out of. all you do is take the guts out of it so it is hollow, adapt the hose and guage and you got it. i could'nt locate one anywhere for mine or that would have been the simplist way to go.

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01-03-2004 10:31:14

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 Re: AC diesel engine compression check in reply to week N warrior / MO, 01-03-2004 08:56:30  
As I recall, the Allis 11000 series engine is actually a Buda engine. AC made a deal, or bought the company - and put their own name on the engine after having a fight with Detroit Diesel. I have an HD6 with the 6000 engine which is a four cylinder Buda 344 cubic inches. I think your engine is the six cylinder version of the same engine with 516 cubic inches (86 cubic inches per cylinder). Early engines have "energy cells" to help starting - something like a precombustion chamber, but not quite. I don't believe a compression check will tell you very much. It will show if you have some really bad cylinders, but it also can show proper compression and yet still be worn out. Blowby and unusually hard cold starting is a pretty good indicator of engine problems. Most of the engines I've seen of this type are direct injection and do not use glow plugs (glow plugs are only used in precombustion-chamber engines). Ether or a block heater is used as a starting aid, and some of these engines also use a heater in the intake manifold that also works as a fuel-primer.

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01-03-2004 09:05:14

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 Re: AC diesel engine compression check in reply to week N warrior / MO, 01-03-2004 08:56:30  
Don't know if its like my 190XT but it had a intale manifold heater on it, as far as compression you need a speacial gauge to check that and you do it from the injector holes but I don't know what it should be

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