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Old 02-08-2009, 14:14   #1 (permalink)
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351M 10W-30/ 89 octane in the pan

got a 79 F150, drivin it last week, and it quit on me. pulled the stick out and found about a 40/60 gas/ oil mix when a few days before it was low a quart and very much straight oil. changed the oil and replaced the plugs (all 8 were oil fouled) tried everything to start it, ignition system, fuel system, timing, everything checks out but still no combustion. did a cranking vacuum test and got a fluctuation of 2-3 inches. thinkin it's either in manifold gasket, rings or valves. any ideas so i can no what to rip apart?
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Old 02-08-2009, 23:42   #2 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

Not sure if I can answer this one but I would start at the fuel pump, it probably failed and backed up into the crankcase.??? Don't know...just a place to start.
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Old 02-09-2009, 11:16   #3 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

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Not sure if I can answer this one but I would start at the fuel pump, it probably failed and backed up into the crankcase.??? Don't know...just a place to start.
Yep, sounds like he has more dumping in the oil pan than going to the carb.
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Old 02-09-2009, 13:32   #4 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

tested the fuel pump, it's an aftermarket electric (the cam lobe for the mechanical is too worn to pump) got maybe 1 PSI. So that's the cause of the truck not running, so i must have somethin else goin on that fuel is gettin in the oil???
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Old 02-09-2009, 14:13   #5 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

So the old pump is totally bypassed?
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Old 02-09-2009, 14:27   #6 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

Well if your using an electric fuel pump and the fuel is from the tank to the pump to the filter then to the carb, I can only think that your intake is leaking from underneath and spilling into the lifter valley and then into your oil. Could be why it won't run or have sufficient vacuum also.

If you have another intake try it first to make sure that is the problem, if not take the intake to a machine shop and they can test it for leaks.
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Old 02-10-2009, 00:34   #7 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

ok thanks ill try that. could that be tied to oil fouled plugs in all cylinders or is that a separate problem?
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Old 02-12-2009, 22:34   #8 (permalink)
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Exclamation Re: 351M 10W-30/ 89 octane in the pan

Moved to Cleveleand section, 351M is not an FE.
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Old 02-15-2009, 02:30   #9 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

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Moved to Cleveleand section, 351M is not an FE.
Do we even have an Cleveleand section
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Old 02-15-2009, 13:19   #10 (permalink)
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Re: 351M 10W-30/ 89 octane in the pan

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Do we even have an Cleveleand section
Yep, we're in it.

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