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Re: Re: Re: Smoky diesel...
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Posted by Bob M on March 11, 2003 at 08:23:24 from (165.170.128.66):
In Reply to: Re: Re: Smoky diesel... posted by Tim Malin on March 10, 2003 at 16:50:04:
Tim - "Bad" compression - "low" compression would have been a more accurate term - will result in exhaust smoke, missing on one or more cylinders, excessive crankcase blowby and hard starting. Low compression caused by worn (or broken) rings is evidenced by a noticable quantity of smoke/vapors escaping from the crankcase vent tube when the motor is running. What happens is air leaks by the rings and into the crankcase as the piston rises on the compression stroke. Similarly combustion gases leak into the crankcase during the power stroke. These gases then escape the crankcase through the crankcase vent tube. You will also see blowby escaping thru the oil filler if you remove the filler cap with the motor running. The only fix for a ring problem is to replace them. Best way is to install new pistons/sleeves (or reboring the cylinders and installing new oversized pistons/rings if the motor is not sleeved) Email me off line if you still have questions!!
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A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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