Valve cover installation help 06 2.4

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07-18-2018 | 01:31 PM

#41

RJ_RS_SS_350

Moderator

Joined: 05-01-2014

Posts: 8,173

From: California

Quote:

Originally Posted by Oldblue

The oil has to get down the valve stem past the guides to lubricate the guides but as the wear to much oil can be sucked in during the intake stroke.

I'm tending to agree with you that leaky valve guides can't be diagnosed with a leak down test. I'd like to hear sleeper's theory, though.

07-18-2018 | 02:12 PM

#42

Cat Man HHR

Senior Member

Joined: 08-03-2010

Posts: 3,564

From: Lake Ronkonkoma, N.Y.

Quote:

Originally Posted by sleeper

True, but loose clearance on valve guides will definitely be detected on a leak down test.
It can tell one if it's the guides, or the rings. You just have to listen during the testing.

How, when both are closed for a leak down test?
I guess it's time to show how a leak down test is done.
Here is one youtube about it:

07-18-2018 | 04:32 PM

#43

BLKHHRSS

Member

Joined: 06-27-2017

Posts: 44

From: Saskatoon

I think that you can do a leakdown test by pulling the air on the other side of the valves, using a plug and a vacuum. Not really a leakdown test though, and only done when the head is off the motor and sitting on the bench. Or at least that is the way I remember it being done, and then I'm still not sure if that shows up the worn guide. Just throwing that out there. But I'm going with the rest of you on this.