Re: valves

Posted by Bob on October 27, 2003 at 20:03:59 from (66.163.134.177):

In Reply to: valves posted by sod buster on October 27, 2003 at 18:06:54:

Some exhaust valves, and more rarely, intake valves are set up with rotators.

There is the Rotocap type, where the valve uses special keepers shaped like "C's", along with a Rotocap- a hardened steel cup that fits on the top of the valve stem. The action of this is when the rocker arm presses down on the Rotocap, the keeper is released by a few thousandths of an inch, allowing the valve to rotate a fraction of a turn.

The other type of rotator is the "positive type", where there are little ramps and springs in the valve spring retainer that rotate the valve a little each time the spring is depressed, also.

The purpose of either system is to rotate the valve to make it wear evenly, prevent "hot spots", and this action probably helps keep particles and buildup from lingering on the seat, which could cause the valve to burn.

As to your question, you make no mention of the type of engine you are ordering a kit for, which would preclude any guess as to whether your engine has rotators or not. You will have to disassemble it and check for yourself.

In some cases, engines that did not use rotators from the factory could possibly have been changed over during a previous rebuild.

If you are getting a complete valve kit, with valves, retainers, keepers, and possibly rotators you may be given the choice of either kit... rotators or not, and it would be your choice, depending on cost, but if you are just buying the valves, you will need to verify which you already have, to match the parts up correctly.

Are you doing the work yourself, or do you have a machinest lined up... he could probably tell with one glance what you need.

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