Meesh:
Originally posted by Meesh
Why do you have to lube the rockers before each session? I thought the fuel lubed them.
The fuel mixture coming into the engine will lube the inlet valve stem, and the excess oil will lube the exhaust valve stem. But for the rockers to get oil it has to come through the valve guides, or past the tappets and work its way up the pushrod tubes.
The amount of oil that actually gets there is so small that it almost can not be measured.
The engine designers chose materials to give long life in this almost dry environment, so the engine will last a good while without oiling the overheads, and the bottom end was designed with the same thoughts. But wear is a fact of life.
By oiling everything regularly, the actual lubrication is a lot better than relying on the piston blowby, and you will find engine wear is almost non-existant.
Again, as stated, the pre-oiling is not necessary. After run oil also is not necessary. But by doing both, your maintenance expense will take a real nose-dive.
Bill.