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Cleaning Exhaust Valves 

 

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 Post subject: Cleaning Exhaust Valves
Posted: Wed Jul 25, 2007 4:44 pm 
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Hi All
Anyone know of an effective way to clean the hard, crusty cr*p
from under the bottom of the exhaust valves.
Thanks
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Posted: Wed Jul 25, 2007 6:22 pm 
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gutza wrote:
Hi All
Anyone know of an effective way to clean the hard, crusty cr*p
from under the bottom of the exhaust valves.
Thanks
yea mate .put the valve in an electric drill .use afile to get the worst off then use some emery tape to finish them off. same on the top . helps if youve got a drill press
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Posted: Wed Jul 25, 2007 6:31 pm 
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I cleaned it all off with oven degreaser. Probably shouldn't have (because its strong s**t) but it didn't seem to effect my head.

 

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Posted: Fri Jul 27, 2007 11:31 am 
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Thanks Guys
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Posted: Fri Jul 27, 2007 3:08 pm 
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make a caustic mix of ordinary caustic soda available from the supermarket cleaning aisle and boiling water. Wear eye and skin protection.

this s**t will move anything and left all my collets, retainers and springs looking like new!

 

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Posted: Fri Jul 27, 2007 5:04 pm 
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I've got a wire brush on my bench grinder... Got one for the drill aswell, polishes them up nicely.
You're obviously doing a head gasket? DO NOT clean the tops of your pistons whatever you do.
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Posted: Fri Jul 27, 2007 5:13 pm 
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Walker wrote:
I've got a wire brush on my bench grinder... Got one for the drill aswell, polishes them up nicely.
You're obviously doing a head gasket? DO NOT clean the tops of your pistons whatever you do.


Hi Walker
Are you saying do not clean the tops of the pistons at all ??
Or just don't use a wire brush attachment on them ??
Thanks
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Posted: Fri Jul 27, 2007 5:18 pm 
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why not clean the top of the pistons??? obviously not while they are down in the bore. but if they top of bore whats the problem????? Honestly just wondering. any time i done a XF head i cleaned the top of my pistons.

 

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Posted: Fri Jul 27, 2007 6:08 pm 
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The carbon on the pistons actually seals them, clean it off and you'll have to rebuild it or fill it with oil every week lol.
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Posted: Fri Jul 27, 2007 6:13 pm 
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Oh ok i didnt know that. i thought thats what the rings were for. sorry not being a smart a***. but i dont see how that can be the case? i admit i dont fully know the ins and outs but based on your theory wouldnt a new motor be no good then? i dont understand how carbon on top of a piston can "seal" it? sory if i apear horibly Naieve

 

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Posted: Fri Jul 27, 2007 7:02 pm 
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On a newer tighter engine it's not so bad, as they wear they become loose, as silly as it sounds it does actually seal them.
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Posted: Fri Jul 27, 2007 7:06 pm 
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Well there ya go. Learn something new everyday. or in the case of this site learn multiple new things a day

 

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Posted: Fri Jul 27, 2007 9:08 pm 
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Walker wrote:
On a newer tighter engine it's not so bad, as they wear they become loose, as silly as it sounds it does actually seal them.



sorry mate that makes no sence at all. carbon on top of the pistons does nothing to 'seal' anything.

in some cases carbon behind the rings and help to keep the rings against the bore

 

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Posted: Fri Jul 27, 2007 9:25 pm 
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Well mate, go clean the carbon off the top and put the head back on and see what happens.
I've seen it happen more than once.

I can't remember exactly why as i've been out of the car game for a while, forgotten a lot... But it's a definate NO NO to clean them, they start to blow by.
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Posted: Fri Jul 27, 2007 9:45 pm 
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Walker wrote:
Well mate, go clean the carbon off the top and put the head back on and see what happens.
I've seen it happen more than once.

I can't remember exactly why as i've been out of the car game for a while, forgotten a lot... But it's a definate NO NO to clean them, they start to blow by.



i have done it many times, my own engines included, and many of them regular customers, none have had a problem after.

the extra compression from shaving the head can cause dramas but cleaning the TOP of the piston (wich never seals against anything and never touches anything) will not effect the piston rings sealing ability.

by you reasoning running a carbon clean or as some people do using water in the intake to remove carbon building should cause the same problem but it doesn't.

i really would expect better then a post like that from a mod

 

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