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White desposit on valves
Topic Started: 27 Mar 2012, 02:32 PM (195 Views)
Cobb
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Dorset Dubber
Currently working on the head of my 1985 1.6 Carb.

Four of my valves have this white deposit on them.
It seems pretty rock solid! Is it carbon?

How do I remove it?
Do I need to remove it?

The valve stem seals were pretty shot, they just fell apart when I pulled them.
The head gasket looks pretty good, came off in one go!


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s3_luke
VAG SLAG
At a guess maybe buy a bottle of redex and empty it into a cup , leave the valves in that overnight let it soak
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vdubant
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Tidy Whore
yeah its carbon. not personally had to deal with it that bad but a brass wire wheel in a bench grinder should get it off.

obviously they will need re-seating when they go back in.
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Cobb
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Dorset Dubber
Came off really easily with a brass wire wheel.
Lapped the valves back in.
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mr_mr
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"substantially quicker than yaaaaaouw"
is it on the exhaust valves? white deposits are normally because of high cylinder temps because of lean mixture. make sure the injectors/metering head are working fine.
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scooterboy67
Tidy Newbie
mr_mr
5 Apr 2012, 07:25 PM
is it on the exhaust valves? white deposits are normally because of high cylinder temps because of lean mixture. make sure the injectors/metering head are working fine.
as he said running to hot due to lean mixture
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