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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32989
Location: Reading Pennsylvania
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 Posted: Sat Nov 02, 2013 4:33 pm Post subject: Read this 2.1 Head |
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Here is a Photo of my 86 2.1 head for cylinders 3 & 4.......
I was sitting and looking at the coolant "residue" and noticed the darker areas.
I wonder, does this color variation tell a story?
*Hot spots caused by the design of the heads cooling passages?
*Head gasket leakage where errant exhaust gases have super heated areas?
*Just one of those funny yet curious unexplained things that happen?
Also, Both heads have a "yellow paint" residue as seen by the coolant intake. Is that a sealer used during initial assembly?
To my knowledge, having only 116,000 miles and with me being only the 3rd owner, with the second owning it for 21 years, the engine hasn't ever been apart.
Dave
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Last edited by djkeev on Sat Nov 02, 2013 4:36 pm; edited 1 time in total |
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Phishman068
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Joined: February 19, 2007
Posts: 2000
Location: Pittsburgh PA (ish)
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Sat Nov 02, 2013 4:51 pm Post subject: |
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Many vangons were serviced at dealers for head leaks via a recall when they were only a year or few old. I know of two vanagons that had that happen back in the day, my dad's and a my Boss at work both had new 1986 vanagons that had this done.
the deposits you see are deposits. often deposits settle at low spots via gravity, collect at cool spots, or flow causes them to collect in some areas more than others. look like c\gravity has caused much of the deposits to collect in low areas, the photograph of shows the head upside down.
that is my read on it, no worries |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32989
Location: Reading Pennsylvania
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Sat Nov 02, 2013 5:46 pm Post subject: |
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| djkeev wrote: |
Yes, the head is indeed photographed upside down, it sits better that way on the bench.
What I find curious is the dark spot at the top of the cylinder #3 (left bottom in the photo) it makes me wonder why cylinder #4 hasn't a similar discoloration,
Dave |
well that cylinder may have leaked a little compression, as the sealing ring is black the other one is not.
there also is normally variations in mixture cylinder to cylinder, a set of injectors may have a 5% variation in flow and that could cause one to be richer than the other. also the rings may allow more oil to enter one cylinder than the other form wear, and uneven valve guide wear may allow more oil into one cylinder than the other on manifold may have a slight intake leak. It is not unusual to see different colors between cylinders in a used motor, lots of potential causes, some of which are considered normal variation. don't read too much into this, it ain't horrible, besides I assume your rebuilding her anyway. with all new rings, guides, pistons, valves, get the injectors cleaned a flow tested etc... you should be fine, that's what I did.
I good diagnostic just for kicks would be to run a leakdown test prior to rebuild, but what's the point if you already know you need to rebuild and you intend to do a complete job?
On my motor I knew #4 had a weak cylinder as my compression tests for the two years prior showed a gradual reduction in compression on #4, I rebuilt the motor when the compression hit about 60-70 psi, on #4 while the others still were 110 +psi. My oil pressure was also getting low, motor had about 178K miles on it.
I se nothing unusual here, no worries! |
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AtlasShrugged
Samba Member
Joined: October 30, 2008
Posts: 1605
Location: Decatur, Ga. USA
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| Posted: Sat Nov 02, 2013 5:56 pm Post subject: Re: Read this 2.1 Head |
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| djkeev wrote: |
Here is a Photo of my 86 2.1 head for cylinders 3 & 4.......
I was sitting and looking at the coolant "residue" and noticed the darker areas.
I wonder, does this color variation tell a story?
*Hot spots caused by the design of the heads cooling passages?
*Head gasket leakage where errant exhaust gases have super heated areas?
*Just one of those funny yet curious unexplained things that happen?
Also, Both heads have a "yellow paint" residue as seen by the coolant intake. Is that a sealer used during initial assembly?
To my knowledge, having only 116,000 miles and with me being only the 3rd owner, with the second owning it for 21 years, the engine hasn't ever been apart.
Dave |
Looks like the metal head gasket seal was not sealing very well on the left hand side..when compared to the combustion chamber on the right.
Black residue on the head gasket sealing surface on the left..nice shiny sealing surface on the right.
More deposits on the head water jacket area on the left too.
The yellow paint was used by VW on replacement heads during warranty or service replacement.
Don't know what the yellow paint is for, other than it is very slippery and hard to remove. Don't know why. |
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