Date: Sat, 16 Jun 2007 19:53:45 -0700
Reply-To: David Kao <dtkao0205@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Kao <dtkao0205@YAHOO.COM>
Subject: Re: Is this the cause of my engine compression problem?
In-Reply-To: <29306606.8961111182046421109.JavaMail.root@vms076.mailsrvcs.net>
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All 4 pistons have a blue dot and STD word on the top.
All rings were already on the pistons. All pistons were
already in the cylinders. I did not remove the pistons
from the cylinder when I install the liner.
It seems unlikely any of the rings can be wrong. It's a
new set of Cofap liner in a Cofap box.
David
--- **************************** <vw4x4@verizon.net> wrote:
> 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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