Re: Engine rattle

Posted by Owen_Dyneto On 2008/12/20 19:25:46

A friend mentioned vacuum advance as well. He says disconnect hose, suck air, watch spring move, put tongue in way to plus hose, and see if spring moves. If so, could be leaky diaphragm. I am paraphrasing out of memory, but sounds easy, too, so I will check as well.

Actually, you don't have to remove the distributor cap and watch for the breaker plate to rotate to check, though that's a good method and checks the distributor internals as well. Simplier test is to determine if the unit will hold a vacuum; put a rubber hose over the steel line to the diaphram, draw a vacuum with your mouth and immediately put your tongue over the end of the hose. Wait a few seconds and release your tongue; if you hear the hiss of air going back into the unit, it held vacuum and is OK.