TIP: Click on subject to list as thread! ANSI
echo: automotive
to: Roy Witt
from: Mark Hofmann
date: 2012-04-13 16:35:06
subject: Re: Odd rumble in Durango solved.

RW> I did a power flush with a system cleaner, so anything like that would
RW> have ended up in the flush machine. Harry wouldn't have been a very happy
RW> camper if that was the case.

I'm sure the Durango power flush of the antifreeze and transmission put
some nasty goop in the flush machine...

RW> The problem could have occured when people used tap water instead of
RW> adding more Dexcool to the system when it was low on coolant.

Most of the cases I heard involved Dex-Cool eating away at the gaskets and
leaking.  The one mechanic said you can almost guarantee the early Dex-Cool
cars to have a coolant leak before 80k.  

RW> If you spend a lot of money maintaining your vehicles with them, they're
RW> going to take care of you as a good customer should be.

Yes, they don't take advantage of people and run a nice shop.  This is why
they are always busy and you have to schedule an appointment to bring your
car to them.

RW> There's nothing to be afraid of, there's just a bunch of rocker arms
RW> 'rocking' away opening and closing valves under those covers. With
RW> hydraulic lifters and after the initial adjustment with the engine
RW> running, there's no need to R&R the covers again.
RW> 
RW> For solid lifter engines, especially that 30/30 Duntov cam, required
RW> valve
RW> adjustments about once a week; or after a hard run on race day.

Is there an adjustment that can be made to stop the "cold engine value
tap" or whatever it is called?  

It really isn't worth taking off the re-sealed value covers at this point. 
I think I'm going to try the 0W-20 synthetic on my next oil change.

- Mark


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