Date:         Sun, 22 Jul 2007 08:31:51 -0400
Reply-To:     Benny boy <huotb@VIDEOTRON.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Benny boy <huotb@VIDEOTRON.CA>
Subject:      Re: scratch on heads mating surface for cylinders

"""The rings (head gaskets) are made of stainless steel. The heads are
Aluminium. I think the rings will not compress."""

Yea, sure... i'll show you a few compress one / damage one.
Many head problem are due to poor ring installation, yea, when the head is
put back, the ring move out of it's position and get compress/damage between
the side wall of the head and the sleeve (where the green O-ring goes. But
yes, you are right, the head will also suffer.

Ben


On Sat, 21 Jul 2007 11:14:04 -0700, David Kao <dtkao0205@YAHOO.COM> wrote:

>The rings (head gaskets) are made of stainless steel. The heads are Aluminium.
>I think the rings will not compress. It is the heads that may yield to the
>extreme torque. But the torque is only 38 ftlb. It's enough to seal if all
>surfaces are clean and flat. Minor scratch may be fine. But if you can not
>eliminate the scratch by lapping it seems the scratch is deep.
>
>The only way to find out is to assemble the engine and do a pressure test
>or leak down test. Any leak into the cooling chamber means replacement of
>the cylinder head unfortunately. Whenever combustion gas is leaked through
>the head gaskets into the cooling chamber it will push coolant out of the
>cylinder head and raises the engine temperature by cooking the coolant.
>The temperature sensor will feel it. The temperature guage will show it.
>
>David
>
>--- Benny boy <huotb@VIDEOTRON.CA> wrote:
>
>> Hi Pascal, unless it's very deep and long enough so it larger than the ring
>> itself, i would not put nothing there, combustion temperature are so high
>> that most product will melt.
>>
>> That ring/head gasket will compress and sould fill the gap, but again, if
>> not to deep.
>>
>> Ben
>>
>> On Sat, 21 Jul 2007 13:28:13 -0300, Giasson, Pascal (DNR/MRN)
>> <Pascal.Giasson@GNB.CA> wrote:
>>
>> >I have some small scratches on my heads, I think they got there from
>> removing the metal gasket that goes between the cylinders and the heads, but
>> not sur as I was really careful when removing them.  Anyway I tried to
>> remove them with lapping compound and laping them with the cylinders, but no
>> luck.  Is there a sealant that I can use or maybe JB Weld?  Thanks
>> >
>> >Pascal
>> >'84Westy
>>
>
>
>
>
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