** Message reposted on behalf of Lio **
From: "Malcolm Bagley" <[Email address removed]>
=> Malcom, I agree with your statments.
Nissan, I did find some swarf from manufacturing present in the head,
but wear in the cam / followers is often oil related and as there was
no sign of overheating from lack of oil so the suspicion is that the
oil broke down and provided inadequate lubrication.
=> What I have seen is camshaft wear due to lack of oil due to
insufficent oil pressure + LACK of oil temp AT IDLE.
Diesel engines tend to cool down "too much" when ran at idle for an
extended period of time, if on top of that you add a poor lubrication
of the top of the engine at idle, you quickly get cams and camshaft
bearing wear. I record Toyota B engines are prone to that kind of wear,
if you let them idle too long and too often of course.
I recall a story on DTLC where UPS delivery trucks were fitted with 3B
engines which lost all their power around 50K miles! Apparently due to
the long idle periods these trucks were seeing.
That's why I personnaly don't let my truck idle when cold to warm it
up. I rather start it, let it run dle for 30sec then drive on light
throttle till it warms up. I see too often people starting their diesel
cold and let it idle for 5 to 10min (while finishing their coffee or
loading the trunck...), thinking it's good to let it warm up before
driving off.
Lio
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Skype: julianvoelcker
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift