kb0nly
06-15-2012, 03:12 PM
First time i have seen this problem so i will ask... Has anyone had a CDI/Pulse Gen Rotor that seems to be worn to the point of loose?
I put a new exhaust on my 84 200ES and that quieted it down so much that i was now hearing the engine noises, figures right? But i knew what it was, valves or timing chain. So i adjusted the valves, knew that was .05mm or .002 inches by heart i have done it so many times. Half the noise gone.. Then i adjusted the timing chain, got even quieter. But there is still this odd ticking noise.
Doing a little probing i found that my redneck stethoscope, screwdriver to ear, was telling me under the cover for the pulse gen. Pulled that off and sure enough the noise got louder. Instinct said pull it, clean it, lube it, re-assemble. So i did that. Hmm it rattles yet. It has a lot of end play on the bushing that goes between the rotor and the camshaft end. That is, the rotor can be grabbed and pulled in and out in other words sliding on the camshaft. Side play doesn't seem bad for its age its pretty tight on the bushing.
Just as a test i took a piece of plastic shim material and put between the washer on the bolt of the end of the cam and the rotor to hold it back tightly, i know this defeats the advance movement of it but i just wanted to see if at idle its quiet now. Sure enough fired it up and its quiet as can be, so its the pulse generator rotor rattling on the bushing that sits on the camshaft.
Which unfortunately looks to be an all in one piece on these, so i would have to replace the entire advancer assembly to fix the slop and the noise. Unless someone else has a better suggestion?
I put a new exhaust on my 84 200ES and that quieted it down so much that i was now hearing the engine noises, figures right? But i knew what it was, valves or timing chain. So i adjusted the valves, knew that was .05mm or .002 inches by heart i have done it so many times. Half the noise gone.. Then i adjusted the timing chain, got even quieter. But there is still this odd ticking noise.
Doing a little probing i found that my redneck stethoscope, screwdriver to ear, was telling me under the cover for the pulse gen. Pulled that off and sure enough the noise got louder. Instinct said pull it, clean it, lube it, re-assemble. So i did that. Hmm it rattles yet. It has a lot of end play on the bushing that goes between the rotor and the camshaft end. That is, the rotor can be grabbed and pulled in and out in other words sliding on the camshaft. Side play doesn't seem bad for its age its pretty tight on the bushing.
Just as a test i took a piece of plastic shim material and put between the washer on the bolt of the end of the cam and the rotor to hold it back tightly, i know this defeats the advance movement of it but i just wanted to see if at idle its quiet now. Sure enough fired it up and its quiet as can be, so its the pulse generator rotor rattling on the bushing that sits on the camshaft.
Which unfortunately looks to be an all in one piece on these, so i would have to replace the entire advancer assembly to fix the slop and the noise. Unless someone else has a better suggestion?