roller cam thrust button?

[slimtastic]

hey whats a safe ammount of allowable thrust on the positive roller thrust button (not the spring loaded one) for a roller cam? .015? .020?




or are people just throwing the cover on and if the cam slightly moves its good?

 

[forcefed3.8's]

.004" to .011". I would go around .005". Too much in and out is hard on the timing chain.

 

[pacecarta]

make sure the cover is dead flat where the cam button bearing runs , oE platic buttons will leave the surface high in the center and thats no good , have the cover spot faced flat
take out the shims on the roller bearing and install cam with the timing gear torque the cover with a gasket inplace and you can check the clearance with a dial indicator through the hole in the block , measure the shims with a caliper and add what you need to get in the ball park at .008-011 , when you retorque the gasket will crush a little more and you should be about .005-008,