Date: Tue, 19 Jun 2007 10:22:06 -0400
Reply-To: Benny boy <huotb@VIDEOTRON.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Benny boy <huotb@VIDEOTRON.CA>
Subject: Re: Is this the cause of my engine compression problem?
David, now i feel bad because i told you NOT to check the rings...
Let's try another compresion test, remove rocker on that side to be sure
valve are fully close, pour a few spoons of oil (20W50) in that cylindre,
try another compression test. If compression is higher, it must be the
rings. It's NOT the piston pin circlip that came out and scratch the wall,
believe me, compression would be way lower than 90, i know :-)
Many have use COFAP and with great Success, BUT, sometime, they do have low
compression at first, pistons and rings can take more than 2000 miles before
they seat properly.
Ben
On Sat, 16 Jun 2007 16:49:23 -0700, David Kao <dtkao0205@YAHOO.COM> wrote:
>This is to keep everyone posted. I found the real problem eventually by doing
>a pressure test to the engine.
>
>I borrowed a compressor and coverted my compression tester into an adapter for
>pressure testing the engine. Found excessive leak in my #1 cylinder through the
>piston rings into the crank case. I could feel a strong flow or air coming out
>of the blowby breather hose, which has an opening inside the S shaped intake
>rubber bellow. I could feel a strong flow of air flowing from the crank case
>through the hose into the bellow. It pushed my finger out when I tried to block
>it off.
>
>Ouch..... It's a new liner there!!! How will it leak like that? When I did the
>same to cylinder #2 the pressure was only at 20 PSI and it pushed down the
piston
>and caught me by surprise. It could not push the #1 piston even at 50 PSI.
I had
>transmission in 1st gear and parking brake on with wooden blocks in front
of the
>front wheels. So the van did not try to run away but the tail of the van sank a
>few inches. There was no obvious air flow through the blowby breather hose when
>testing cylinder #2.
>
>Repeated the pressure test 4 -5 times and the results were consistant.
>
>The leak is less severe for cylinder #3. But the air flow is obvious there. I
>think these are enough to conclude that I have leaking rings on #1 and #3
cylinders.
>The leak was so bad it actually caused slight over heating during my
weekend trip
>of 320 miles.
>
>The liner is new, with 800 break-in miles. I have to conclude that Cofap is
junk.
>Or at least the set I got is near junk. Further breaking-in probably won't make
>any improvement as I have had 800 mile on it.
>
>My patience is running out for now. I won't try to fix it for the next week
or two.
>I don't think I did anything wrong in istalling the liner. I did not align
the rings.
>According to Benny this is not likely a problem. I have heard that Cofap
has a wide
>range of quality distribution between junk and excellent. Can anyone
confirm this?
>
>David
>
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