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echo: automotive
to: Roy Witt
from: Mark Hofmann
date: 2012-04-18 10:59:02
subject: Re: Odd rumble in Durango solved.

RW> No. One could make an attempt to fix that by removing said lifter, take
RW> it
RW> apart and clean it, maybe replace the spring. As long as there is engine
RW> valve spring pressure on that weak lifter, it will leak down and need to
RW> be pumped up by engine oil pressure before the valve tap goes away.

My original engine didn't have that cold engine tap - so I guess they used
different parts on the Jasper rebuild.  Not a big deal, since this is
really minor and not causing a problem.

RW> You might want to re-think that. By going heavier with your oil, rather
RW> than lighter. The heavier the oil, the less likely the lifter will leak
RW> down. Give 10w-40 oil a try.

I'll give that a try.  It isn't easy to find synthetic in 10w-40 - most are lower.  

My thinking was since it doesn't do the "cold engine tap" when it
is warmer outside, the oil is more lean and can be pumped up quicker when
you start the car.  

- Mark

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