frog

What causes the deposits you can see on the pictures below (pistons #3 and 4) ?
How can it be fixed ?







Thanks in advance
Greg

frog

UP UP UP for the night owls

velocity

looks like burnt oil to me.maybe valve guides or stem seals,or rings also looks like the valves kissed that piston a few times leaving the tell tale smiles. .might want to find the cause of that first

wimwerf

indeed, the valves are hitting the pistons.

Stu @ M Developments

iTrader: (12)

Oil or excessive fuel.

frog

Thanks peeps, the contact is due to a cambelt failure, hence the head being off, having stripped the head, we found that the valve guides were worn to say the least.

Are the deposits a long term problem or just one of those things ?

Stu @ M Developments

iTrader: (12)

The deposits may simply be down to the valve guide wear as a worn giude will allow oil ingress into teh combustion process.

Its also worth checking the fuelling is not excessive once the engine is reassembled.

frog

Thanks Stu, that makes me feel a little more comfortable, does the above mean a rolling road tune or a mapping session ? I am running a stage 1 chip from power engineering at the mo.

Cheers

Stu @ M Developments

iTrader: (12)

Certainly not a mapping session at stage 1 mate, just a check over by someone with the right equiptment and the competence to use it correctly.

frog

Thanks stu, will do that once it's back on the road.
PS: Did you get my cheque for gold membership ?
Thanks

Stu @ M Developments

iTrader: (12)

Sorted about 20mins ago.. many thanks pal

frog

yes sir can see it now - thanks for the prompt attention