SOHC.co.uk Forums > CB500/550
how to clean valves properly
Nurse Julie:
The valves look like the seating are burnt. It is advisable to re- face the valves and re-grind the valve seats. Check the valve guide to valve stem clearances are within spec.
We find a good result de-coking valves by soaking in thinners for a day and wipe off.
RBoss:
Thanks for the advice!
--- Quote from: Nurse Julie on January 09, 2022, 07:48:37 PM ---The valves look like the seating are burnt. It is advisable to re- face the valves and re-grind the valve seats. Check the valve guide to valve stem clearances are within spec.
We find a good result de-coking valves by soaking in thinners for a day and wipe off.
--- End quote ---
@ Julie what is een-facing the valves?
Nurse Julie:
--- Quote from: RBoss on January 09, 2022, 08:48:37 PM ---Thanks for the advice!
--- Quote from: Nurse Julie on January 09, 2022, 07:48:37 PM ---The valves look like the seating are burnt. It is advisable to re- face the valves and re-grind the valve seats. Check the valve guide to valve stem clearances are within spec.
We find a good result de-coking valves by soaking in thinners for a day and wipe off.
--- End quote ---
@ Julie what is een-facing the valves?
--- End quote ---
Do you mean re face?
RBoss:
Do you mean re face?
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Yes! Autocorrect on a smartphone…
McCabe-Thiele (Ted):
FWIW except when I have had to have new valve guides on car cylinder heads I have found most valves will seat ok by just going throught the two grades of grinding paste. Coarse to remove the worst bits then fine for the final seating. It's tedious but I've always managed to get the surfaces back to where they should be. Professional engine r-ebuilders often re-face the seats as it's more cost effective but if your labour is free then its worth a shot.
It's time consuming but unless you have serious pock marks on the seating face they usually clean up okay. Your fist grind with coarse paste will usually reveal if the pock marks are too deep so need re-facing.
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