Vlv Clearance question
Posted June 11, 2010 - 06:47 AM
Rather than get new pads I simply took them to work and ground .002" off of the exhaust and the outer two intake pads which brought me to the high side of the tolerance. Intake tolerance is .004-.006" and exhaust is .008-.010"
However I ground .005" off the middle intake pad and after installing I am still unable to get .0015" between the lifter and cam.
since I was unable to determine the exact gap or lack there of I started at grinding .005" off the pad and since its still tight I plan on grinding off another .005" tonight at work. Is this unusual to have all other gaps be near spec and have one that is way out?
Thanks in advance,
Posted June 11, 2010 - 08:12 AM
Allowing the engine to run like this is to risk dropping a valve head into the engine at speed; an exceedingly ugly experience.
Posted June 11, 2010 - 08:17 AM
Posted June 11, 2010 - 08:46 AM
You will probably have to provide the parts yourself, since the shop will generally be a small machinist business without a big parts department. The valves will have to be replaced, since they cannot be refinished. The seats do need to be refinished, which is the primary reason you need the machine shop. How well the seats are finished is the key to how long the valves will last.
Before you hear otherwise, you absolutely cannot just drop in a new valve and lap it to the seat, no matter what the manual or anyone else says. It damages the hard facing on which the Ti valves depend, and does a poor job of refinishing the seats.