Re: Are exhaust valve rotators mandatory?

Posted by Guido. on July 31, 2009 at 15:06:10 from (71.168.198.25):

In Reply to: Are exhaust valve rotators mandatory? posted by atlarge54 on July 31, 2009 at 05:03:21:

Hello atlarge54,

The reason you need to put the rotators back is that they extend the live of the valves and valve seats.
There are 2 types of rotators , positive and non positive. You clean all the ones that look good (ONE PIECE) and replace the ones that come apart or are broken.
To check them you need to do it when the engine is running. Before you start the engine you put a chalk mark on them. When you the engine is running, they will rotate/advance a bit at each valve movement. This action will keeps the seat clean. If you find that some are bad after the engine is reassembed, they can be replaced without taking the head off. A special valve tool and air into the cylinder is all you need to do that.
Guido.

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