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8N Front-Mount Distributor Cam Shaft Play

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Mike C - Seven

07-06-1999 10:00:54

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I bought a replacement breaker plate for my front-mount distributor and installed it following the Shop Manual. The old plate (which didn't look all that old) fit loosely into the distributor housing, held in place only by a wire clip in a groove around the housing circumference plus the timing adjustment screw. The plate could be rotated freely in the housing with one finger. With the old plate, the camshaft rotated very freely (could give it a spin with two fingers and it would turn 1 or 2 revs). New plate looks exactly same as old one (clearly the right part) but fits extremely snugly (has to be tapped in and can only be rotated with force from a screwdriver. With new plate, the camshaft is very tight and can only be rotated with difficulty using fingers. This is partly because the new cam contact is not worn in and the new spring is stonger, but I also suspect the front brass-lined bearing sleeve on the plate is not aligned exactly right with the rear bearing sleeve.

Has any of you experienced folks run into this before? Will this thing "burn in" or "burn up" if I go ahead with it?

Mike C
Seven Fountains VA

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Claus

07-06-1999 11:48:12

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Re: 8N Front-Mount Distributor Cam Shaft Play in reply to Mike C - Seven Fountains VA, 07-06-1999 10:00:54

I ran into a similar problem with mine. Although I did not replace the breaker plate assy, I replaced the cam and weights assembly as well as the bushings. I kept working the breaker plate assembly on the shaft until it got a little looser. Your theory may be correct that the centerline of the 2 bushings do not line up perfectly, since the front bushing holder is riveted on to the plate. If you have the older cam and weights assembly, remove the screw in back and oil the wick that is inside. Also, check the hole in the front of the shaft, this usually gets carboned up. Also in the back bearing part, clean out the oil groove. Happy Motoring
Claus

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Mike C - Seven Fountains VA

07-09-1999 14:33:19

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Re: Re: 8N Front-Mount Distributor Cam Shaft Play in reply to Claus, 07-06-1999 11:48:12

Thanks - got it loose enough using your method that I think it will not ignite. I'm following your lead on the oil grooves etc. also.

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Claus

07-09-1999 19:21:01

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Re: Re: Re: 8N Front-Mount Distributor Cam Shaft Play in reply to Mike C - Seven Fountains VA, 07-09-1999 14:33:19

Well, you want it to ignite, the fuel that is.. Hopefully then, it will be the only thing it will ignite... Happy Motoring
Claus

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Mike C

07-12-1999 06:35:05

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Re: Re: Re: Re: 8N Front-Mount Distributor Cam Shaft Play in reply to Claus, 07-09-1999 19:21:01

I set the camshaft up on the vise, put the new plate on the shaft in the inverted position, and rotated it with a ruler held on top. Could easily see the front bushing was misaligned. Using a second ruler held upright on the bench to measure the deflection, and working the plate around with a pliers, I got the error down to more or less invisible in about five minutes. Installed it this weekend and she runs fine -- front bushing was not hot at all after idling for awhile!

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Mike C

07-12-1999 06:32:08

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Re: Re: Re: Re: 8N Front-Mount Distributor Cam Shaft Play in reply to Claus, 07-09-1999 19:21:01

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