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[Kevin Wood]

Thanks ken.

The burnt carbon appears quite extensive.  Think of extremely burnt toast and you got the picture.

Tested to see how bad this was and now believe scraper only way to go.  Have a gasket scraper but  will have to be very carefull, or as advised may have to get a plastic scraper/spatula to do job to prevent damaging crowns

Put a bit of grease round the edge of the piston to block the gap and prevent the crud from falling into the gap between piston and bore and then use a scotchpad / non-metallic kitchen scouring pad, perhaps with a little oven cleaner, to clean the crown.

At the end of the day, it doesn't need to be spotless, and, if it has built up an excessive amount of carbon due to poor stem seals, it will soon be burnt off on the first motorway run once the engine is running OK again, so don't risk damaging anything to get the piston crowns clean.

Kevin

[sotmh]

thanks ken will try that although they did feel quite hard to the touch

[sotmh]

Got head back and have ordered some bits from Andyc.

Was in my local autofactor to get coppergrease and got copperease (commas brand) and was speaking with him about use of sealant.  He said to use sealant with head gasket to get proper seal, but have heard on here only gasket was to be used.  Can anyone say which is correct.  He also was offering high temperature sealant for this and on the remainder of the work eg manifolds etc.  I thought I would ask you guys about that. :-/

Whilst there I asked about the burnt oil on piston crowns and was informed it was use of poor quality oil and not good oil changing.  If burning quite bad (toast burnt to cinders) then rings also probably damaged and should also be changed . I am now wondering if this is right or is he wanting to sell more stuff?

From what I have seen from my time of ownership I believe previous owner did not service it properly and probably only topped up with cheap oil.  

Thoughts anyone

Thanks in anticipation