millenniumtree
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| posted on 12/11/05 at 07:22 AM |
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White buildup on exhaust valves
There is a very hard chalky buildup on the exhaust valves.
The buildup is 1/8 to 3/16 inch thick, and is ONLY on the exhaust valves of ONE piston.
The compression test revealed nothing unusual about that piston at all, in fact it compressed every bit as well as the others.
Any idea what this crud is and what has caused it?
130,000 miles on the motor.
This is the problem cylinder, look carefully at the lower (exhaust) valves.
 
Valves Cylinder 2
Compared to cylinder 1, which looks fine.
 
Valves Cylinder 1
[Edited on 12/11/05 by millenniumtree]
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SeaBass
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| posted on 12/11/05 at 09:17 AM |
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Did this engine have a head gasket failure before tear-down??
What is the engine? Has it been running with twin carbs where mixture could be different?
Cheers
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Syd Bridge
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| posted on 12/11/05 at 10:22 AM |
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If its got EFI, then I would be looking for a faulty injector. Have them all cleaned and flow tested.
Also, check the cam followers and cam for irregularities on the relevant valves.
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GeoffT
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| posted on 12/11/05 at 10:24 AM |
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The white deposits on the exhaust valves look completely normal for a high mileage engine - in fact the other three cylinders look abnormally wet and
oily. I suspect that all four cylinders are alike, but during or after removal, three of them became contaminated with the stray oil and water that
often accompanies this operation. You've probably got nothing to worry about.
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jollygreengiant
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| posted on 12/11/05 at 11:52 AM |
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The valves look absolutely fine & probably only want lapping-in. However I would suggest that looking at the cylinder chamber (central in the to
picture), that the slight cleaning of the chamber face just above the inlet valves is indicative of the start of haed gasket failure (and steam
cleaning effect) between the water way and the cylinder.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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jollygreengiant
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| posted on 12/11/05 at 11:53 AM |
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should have had this attached
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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