30-03-2018, 02:49 PM
These two photos show the extent of the valve seat recession on the exhaust valves, and the concentric ridges on the sealing faces, where I would expect a dull grey smooth surface. You can feel the ridges under your finger nail. Chris has identified my dilemma - I would really like to get the block skimmed and renew the valve seats, but this is my first Seven and I want to get it out on the road. My plan is to buy a new set of valves and and a valve seat cutter, which should enable me to then lap the valves in with the minimum removal of material from the block.
An alternative in the short term would be to put everything back together as is and see what happens. Compressions were all about 80psi (cold, dry, starting handle, manifolds off), except when the valves were sticking. Adding oil made no difference, so I am confident the piston rings are OK.
Interested in the thoughts of them as knows though.
An alternative in the short term would be to put everything back together as is and see what happens. Compressions were all about 80psi (cold, dry, starting handle, manifolds off), except when the valves were sticking. Adding oil made no difference, so I am confident the piston rings are OK.
Interested in the thoughts of them as knows though.