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Re: What's normal blow by?
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Posted by Jerry/MT on June 03, 2006 at 11:17:04 from (67.72.98.45):
In Reply to: What's normal blow by? posted by tim(sd) on June 03, 2006 at 11:02:24:
Boy that's a tough question! You're looking for a definite answer to a subjective problem. With 5800 hrs of heavy farm work, I'd expect a diesel tractor to have some blowby from normal wear and it should increase as you demand more power from the engine because the combustion pressure increases. How much is normal versus how much is abnormal is a judgement call. The best way to determine the condition of the cylinders/rings is to do a compression test. To do that you need a diesel compression gauge and adapters and you need to remove the injectors. I don't know how I would describe serious blowby but I'd probably know it if I saw it. If the tractor starts well in cold weather and otherwise runs fine and if the blowby just looks like a vapor (not bluish smoke) with no oil dropets in it and it doesn't feel like a real rush of gas out of the vent pipe I'd say it was normal. Hope this helps you.
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