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Allis Chalmers Discussion Forum
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262 deisel compression check.

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frosty

12-09-2004 17:17:51




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How do you do it?





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Don Dittmar

12-13-2004 05:02:17




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 Re: 262 deisel compression check. in reply to frosty, 12-09-2004 17:17:51  
If the engine is indirect injected, you can also go in through the glow plug



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Kevin (FL)

12-12-2004 07:10:09




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 Re: 262 deisel compression check. in reply to frosty, 12-09-2004 17:17:51  
Frosty,

Never checked our '59 diesel, but the only way I know to check diesel compression is to remove the injector and install an adapter fitting. I've seen them made from old injectors with 1/4" pipe fittings welded where the fuel line would go and the return fuel fitting welded up. Also would have to unscrew the tip end and remove the "guts" of the injector to allow the air up to the gauge line. If you don't want to go the shade-tree route, you can also buy adapters that work.

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Gatz

12-14-2004 10:18:50




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 Re: 262 deisel compression check. in reply to Kevin (FL), 12-12-2004 07:10:09  
On the 262 engine there are "power cells" right below the intake/exhaust mainfold.
(These are what the fuel impinges on in the indirect-injection engine)
You could make an adaptor that bolts in place of the cell which is nothing more than a hat-shaped piece of hardened steel with a hemisphere on the chamber side.
You'd have to rig up an air gauge that has a check valve to get "high reading" and this gauge should be snubbed.
I dont know if a standard compression gauge made for gas engines would work, because you're dealing with a diesel.
I talked to my brother who is retired from Caterpillar Engine R&D, He mentioned that an estimate of what to expect from a diesel is to multiply the compression ratio (#:1) by 15.
For instance if your compression ratio is 16:1 use 240 as the top reading. Obviously, this number would be "ideal"
Thus, your gauge would have to be rated around 300 psi or more. And as I mentioned, the gauge should be snubbed to avoid damaging it.

Just talked to a local diesel repair company...they said the gauges for use on a diesel should be available form Mac or Snap-On sales.

Gatz

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