72 Ford F-100

Old 12-21-07, 01:55 PM
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72 Ford F-100

Posted this in the wrong section before. I have a 72 Ford F-100 that has some black coming out of the exhaust. It has done this for a while but the other day I left it running for a while and it got on the garage door. It was in the shop a while back to have the oil pump and the oilpan replaced (had to be fabricated). They didnt say anything else was wrong but a friend said that it might be oil coming out cause the valves are bad. Anybody know about this? Are there anyother signs or ways to see if this is the problem.
Old 12-21-07, 02:32 PM
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Black residue on the exhaust is a rich condition, How does the truck run? How is your gas mileage? It sounds like you need a tune-up, carb adjustment, and/or timing adjustment
Old 12-21-07, 03:38 PM
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Ya, that's where I'd start - a complete tune up including carb adjustment. Also possible the choke is sticking.

Bad valves will affect preformance but shouldn't affect oil usage. Blue smoke would indicate oil seeping past the rings.
Old 12-23-07, 09:14 AM
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Ya' I'd be looking at choke adjustment & lubrication of linkages etc. That's where I'd start. As indicated in other posting, blue/white smoke for oil burning. If you do see blue smoke after choke etc, taken care of, and oil usage, you have 2 most likely causes. Yes, oil seepage past rings, but you could also have bad/worn valve guides &/or seals. Let's face that if & when, it comes to that. Continuous blue smoke while driving, I'd lean toward bad rings. Blue smoke more evident at idle, valve guides or seals, or both.

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