Ron Lang
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| posted on 9/4/17 at 04:13 PM |
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Blacktop Head Gasket
Does anyone have any words of wisdom regarding head gasket replacement on the 2.0 blacktop? Following a coolant leak on a track day (not me I might
add!), it looks like the head gasket has gone. I have no idea if it needs a skim until I have it apart.
Should I just skim it anyway? I'm assuming it will be nigh on impossible for me to diagnose a warped head unless it's really bad (which it
isn't as it is still running, just about).
Also, while I have it apart, what else should I check for damage and what performance mods should I consider while I have the opportunity?
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tr7v8
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| posted on 9/4/17 at 04:36 PM |
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Good straight edge & skinny feeler gauge with a bright light will tell if its flat, if in doubt wazz it down an engineering shop to check.
Personally I skim 'em all as it gives a nice clean surface for the new headgasket. Check the exhaust manifold & its surface as well.
Make sure the block is nice & clean as well.
Worth recutting the valve seats & checking the valve guides & springs whilst you're at it. New valve oil seals (if it uses them) will
stop it smoking. Obviously check the bores whilst the head is off.
Jim
2005 Porsche Cayenne S
2000 Jeep Grand Cherokee Sold
2010 Maxda MX5 Sport Tech
2000 Porsche Boxster S (now sold)
Light travels faster than sound. That's why certain people appear bright until you hear them speak.
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Ron Lang
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| posted on 9/4/17 at 05:04 PM |
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I should have said that the engine has only done 4K miles. Would your advice still be the same?
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tr7v8
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| posted on 9/4/17 at 05:25 PM |
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quote:
Originally posted by Ron Lang
I should have said that the engine has only done 4K miles. Would your advice still be the same?
As for skimming probably not. Worth checking & I'd scrub it with some coarse wet n dry to give a key. A specialist could tweek the head
ports & seats to give some more power. Use a new cambelt, I was always taught & I believe Gates etc. say that once detensioned you
shouldn't reuse it.
Jim
2005 Porsche Cayenne S
2000 Jeep Grand Cherokee Sold
2010 Maxda MX5 Sport Tech
2000 Porsche Boxster S (now sold)
Light travels faster than sound. That's why certain people appear bright until you hear them speak.
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britishtrident
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| posted on 9/4/17 at 06:17 PM |
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The first thing to do if work out why the gasket failed, take a good look long and hard at the cooling system layout particularly that there is
sufficient by-pass circulation. By-pass ensures the thermostat open and works proplerly and the block and cylinder head warm-up more evenly .
I would strongly advise not to skim the head unless you have reason to suspect a problem with it, just check everything carefully one of the most
useful low cost tools for checking for surface damage to a head is a triangular ruler it can show up damage the sometimes won't show up with
precision straight edge.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Ron Lang
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| posted on 9/4/17 at 06:53 PM |
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Seems that the cooling system had a leak and the guy driving hadn't noticed the temp going up. He's carried on driving without coolant
essentially.
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cliftyhanger
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| posted on 10/4/17 at 07:38 AM |
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You need to get that head checked for flatness, if overheated it may have warped.
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