On Thu, 16 Apr 2009 12:33:52 -0400, wrote:

On Thu, 16 Apr 2009 09:07:24 -0500, Randy wrote:

On Wed, 15 Apr 2009 07:51:00 -0700 (PDT), stryped
wrote:

SOmeone saif that doing a valve job on an old engine is a
gamble,becasue the increased compression will put increased stress on
lower end parts.

I am replacing the head gasket on a 3.9 dodge with 151,000 on it. I am
debating with having a valve job done or not. I will have it crack
checked and milled if necessary.

Or I thought about just laping the valves at home. I put fluid in one
of the heads and it seeped out slowly of every valve but one.


My experience, I did exactly that, pulled the heads, cleaned them
up, hand lapped the valves, and put on new valve stem seals, put heads
back on and I now had a rod knock. Guys I talked to said the bottom
end most likely had excessive clearance to start with and the better
valve seal and higher cylinder pressure now made I knock I could hear.
Local auto machine shop had a 10 week wait on crank grinding, I bought
a factory regrind and all was well.

OTOH, this was in a truck I had bought at auction, 90K miles and was
owned by the NJ/DE toll bridge commission so It most likely had
another 100K worth of wear sitting on the side of the road idling. Who
knows about oil changes.

If you are pulling the engine out, check the bearings, if you're doing
the heads with the motor in the truck then just try it. If you
maintained the oil you should be OK.

Thank You,
Randy

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Most likely had antifreeze get into the oil and take out the bearings.
Nothing to do with the valve job.

No antifreeze, I can guarantee that.
Thank You,
Randy

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