Posted by jacks on March 15, 2020 at 12:53:54 from (209.202.224.123):
In Reply to: Valve job posted by Gary Mitchell on March 13, 2020 at 08:27:19:
If you are planning to use the engine at lower engine speeds (typically less than 3000 rpm) you will not get much if any benefit by installing hardened seats. Most old farm tractors can do their work running in the 2000 or less rpm range. If the seats in the block can be cut or ground satisfactorily, they will be fine for lower rpm use as described. Gasoline engines which will see hard service above 3000 rpm should have hardened seats installed. On a diesel engine, as has been mentioned, seats cut too deep into the head will cause hard starting. Here is a link to a field study done by the SAE (society of automotive engineers) and the US department of Agriculture which arrived at the the conclusion stated.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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