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Old 06-28-2009, 02:17 PM   #26 (permalink)
dfkrug
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Join Date: Feb 2004
Location: NorCal
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Default Re: John Deere 4300 complete rebuild

Quote:
Originally Posted by johndeere4300 View Post
Should i be getting the "valve adjustment" done with the hours i have on it ??
Valve adjustment? Well the maintenance schedule prob does call for them....
I do not know the frequency. If an engine goes a REALLY long time without
adjustment, eventually you can get valves that do not fully close, so you
get a loss of compression, resulting in hard starting, and maybe even burnt
exhaust valves. Or the lash gets greater, which is not as big of a concern. On a gas engine, you can hear excessive lash (tick, tick, tick), but it is hard
to hear on a Diesel.

The bigger concern for you guys with a JD 4200/4300/4400, and maybe the
4x10s is that you could be in for a split air hose. This event will cause
the engine to eat dust, eroding your cylinders, with quick failure. As the
engine starts to get lower and lower compression, it will be harder to start
and you will get more black smoke, due to partially burned fuel. Checking
your hose can only be done if you remove the fuel tank.

BTW, draining your fuel and rinsing out the sludge is not hard at all, so you
may want to do this bit of preventive maintenance.
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