- Jul 5, 2020
Opinion seems fairly polarized on installing valve spring insulators (part-no: 06.7845) under the intake valve springs. I know these get shipped in packs of four and the parts manual shows they should go under ALL the springs. Like a number of owners, when I stripped my 850 Mk3 there were only insulator washers under the exhaust springs and not under the intake springs. The exhaust valve seating allows insulators to sit snugly under the exhaust springs but the profile is more dished on the intake side of which the base valve (steel seat) washer fits perfectly without an insulator washer. If you try to sneak in insulator washers underneath the exhaust side the whole assembly has no secure seating, sits too high and allows too much side movement in the assembly. What could happen if you leave the valve spring insulators off the exhaust side? Any thoughts greatly appreciated.