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John Deere Tractors Discussion Board

Re: Compression tester

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Posted by BushogPapa on January 26, 2013 at 09:10:28 from (

In Reply to: Compression tester posted by Mark Poss on January 26, 2013 at 03:51:45:

Compression is so low on a Hand-Start JD that a compression test should not be necessary...YOU can tell if the cylinders are Leaking down badly..

Maybe the appropriate question should be: How fast of a leak-down would be too much..
If you need to turn it over fast, to feel is leaking down too fast..!!
You should feel little, to no leak-down with a good Fresh engine..
Accumulated carbon, debris and burning from leaking gases will allow valve leaks long before ring wear would be the cause..BUT...
If the time of the last re-ringing is totally unknown, put new rings in when the head is off for is pretty easy and may not be as good as a re-bore, but with GOOD Honing, will improve the compression for many years..certainly until it needs another Valve-Job...
A "GOOD" Valve Job is not necessarily what you will get at JD..
I had to re-do a JD 50 head that JD had done...
They had simply dropped New Intake valves on to UN-re-conditioned seats, and those seats were the absolute worst-looking rusted, pitted seats you will see (and they called it a "Valve Job")..
Take it to someone who Will do a good job..!!



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