Rear Main Seal
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Joined: Jan 2002
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From: GANS
Rear Main Seal
Ok, now, I am fired up. Get everything done with my beater '85 f- 150 300-6, drive it over to get inspected, and the oil pressure gets lower (a little under 10psi per 1000rpm), and if you bring it up to 2500 and run it easy, it knocks a little bit. So i check the oil, and it turns out to be 2 1/2 quarts low on oil. I shine my light down under, and discover that the tranny (and crossmember) is covered with oil. seems to be leaking out at a decent rate.
Now my questions are:
1) I am assuming that blowing oil out the rear will cause some loss in pressure? (at startup, I get about 40psi at idle, when its 50 out, when it warms up, it drops down to about 15 psi with a 1200rpm idle [cant figure out how to adjust the idle yet[)
2) How long do you think it would take a shop to change it? 4hrs?
3) Why do they go bad? Dry rot? or are the main bearings shot?
Now my questions are:
1) I am assuming that blowing oil out the rear will cause some loss in pressure? (at startup, I get about 40psi at idle, when its 50 out, when it warms up, it drops down to about 15 psi with a 1200rpm idle [cant figure out how to adjust the idle yet[)
2) How long do you think it would take a shop to change it? 4hrs?
3) Why do they go bad? Dry rot? or are the main bearings shot?
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Joined: Sep 2003
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From: Right Next to U
Years of age of heated oil soak rubbe....so far they last for 15 to 30 years depending if they are driven or sit in a enclosed garage and are driven by a little old lady to church or a mad road rage idiot that enjoys passing you and then turning left in front of you so you'll have to stop for the idoit......driven hard is whats FORD is all about...thats why Ford is a Top seller of Trucks.
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From: Right Next to U
Not in a V6 but the 351W has two halfs on the rear seal, had to lift the motor and drop the pan to get to it, looked like a rope with rubberized threads on it, guess it was in since new, no leaks now....tooked about 6 hours to do by myself.
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Logistics Pro
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From: GANS
Actually, I was looking at the haynes manual, and they said you don't have to drop the pan for a 300-6. They said if you have a 2 piece seal on the 351W, you have to drop the pan, but not on the one-piece seals. yay!
