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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

timing issues

Old Feb 29, 2012 | 04:11 PM
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85 f-250 7.5l
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timing issues

have 85 f-250 and the timing keeps changing. thought it was the distributor so i replaced it. i had it set to 8 btdc like the sticker said. the truck kept its timing while running turned off the motor than back on and still kept time. let the engine cool than started it up again and now its at about 20 atdc. any ideas???
 
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Old Feb 29, 2012 | 04:41 PM
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Your harmonic balancer may be slipping. The rubber breaks loose, and lets the outer ring slip around, and that's where the timing marks are. If the timing really was slipping, then you should notice a difference in how it runs.
 
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Old Feb 29, 2012 | 04:49 PM
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The idle speed and the differnce in the marks is the only difference
 
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