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Unread 11-22-2007, 12:51 PM   #1
Havasu Living
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1980 CJ7 
 
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Location: Lake Havasu AZ
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Timing marks jumping

1980 CJ7 258 with about 100k miles. Had the head redone several years ago. I warm up the engine hook up the timing light. While I watch the marks they stay steady for several seconds then the timing will jump to about 15 btdc for a revolution then go past the 0 timing mark by 6 degrees for a second and then return and steady out. This repeats over and over. It's not a purring engine, but pretty good at idle.
Would this be a worn out timing chain? Thanks

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Unread 11-22-2007, 01:11 PM   #2
79cj7reny
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Yup.
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Unread 11-22-2007, 04:57 PM   #3
high51977
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do you have the vacuum advance disconnected? are the mechanical advance springs good? if you answered no to either one of those questions check there first then suspect the chain
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Unread 12-09-2007, 05:55 PM   #4
Havasu Living
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1980 CJ7 
 
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It was the dizzy shaft. It was wobbling severly. Not sure why yet. Anyway installed a spare and now working like a champ.
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