Date: Sat, 16 Jun 2007 21:13:41 -0500
Reply-To: **************************** <vw4x4@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: **************************** <vw4x4@VERIZON.NET>
Subject: Re: Is this the cause of my engine compression problem?
Content-type: text/plain; charset=UTF-8
Typically a problem like this is caused by the wrong
size rings/cyl. Did you check the parts before assembling?
From: David Kao <dtkao0205@YAHOO.COM>
Date: 2007/06/16 Sat PM 06:49:23 CDT
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Is this the cause of my engine compression problem?
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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