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The oil pump on my '79 4x4 351M gave out last night. The oil pressure has been going down for the last couple of weeks. I checked the gauge operation and it works fine; but, does not register any oil pressure when engine is running.
My question, can you remove the oil pan without pulling the engine? If I unbolt the pan, will it clear the crossmember? I am sure I will have to remove the exhaust manifold pipe because left side maniflod pipe crosses under the oil pan.
Thanks for the help
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'79 150 4x4; '86 150 4x2; & '96 150 4x2 all with 300's and '85 SB 4x4 w/ 302 FI.
It'll drop down enough to get a hand in there and check to see if the pump is still on the tube. Depending on your firewall clearance, also a way is to let the motor mounts loose and jack the engine/transmission up as far as it will go. That'll give you at least a few more inches to check it. But, as far as I know,, the oilpan wil not come out without serious dismantling of the drivetrain. Did you check for current from the sender unit? Put it on a meter with the truck running. You might want to go to a junkyard and pick up a different gauge and see if it registers on that one before going to all the hassle of getting into the bottomend. Also, pull the sender and clean it up, check it out. They are dirt cheap too, try replacing that. If the engine isn't making any noise like it's starved for oil, then it's more than likely just in the system, not in the pan. Always check the easy stuff first
I removed the sending unit and rigged up and adapor and put 50# air pressure to it and the gauge came right up. I also cranked the engine for about 15 seconds and almost no oil came out the sending unit opening.
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'79 150 4x4; '86 150 4x2; & '96 150 4x2 all with 300's and '85 SB 4x4 w/ 302 FI.
Time to drop the pan then, you've either got a clogged/shot/disengaged pickup or problems farther up the tube. Take the screen out and see what you find.
I am not looking forward to this job - I wonder if I wouldn't be better off just pulling the engine. I did a search on oil pan removal and there are several "horror" stories on oil pumps & pan removal.
Thanks for the info.
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'79 150 4x4; '86 150 4x2; & '96 150 4x2 all with 300's and '85 SB 4x4 w/ 302 FI.
If you are willing to take the time and have the equipment necessary, it's always better to pull the engine with something like this. Give everything else a good once over while it's out. Save ya headaches in the future. Most importantly, lol, if it looks questionable,,,, Replace It!!!
On a 79 4wd the oil pan should be easy to get off. The crossmember is under the pulley area of engine. If you need more room between engine and axle you can jack up the frame. The horror stories you read are from 2wd trucks and 80-later which have a large crossmember directly under the engine.
I got back under the front end and the crossmember is more to the front of the engine. The truck is a factory "high-boy" and there is plenty of room between the axle and bottom of pan. I will have to remove the exhaust manifold pipe; but, that's a lot easier than pulling the engine.
Thanks for the follow-up information - I was starting a parts for sale sign when I checked back for messages.
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'79 150 4x4; '86 150 4x2; & '96 150 4x2 all with 300's and '85 SB 4x4 w/ 302 FI.
on mine here is what I did I jacked my truck up where the wheels was off the ground blocked it up with railraod ties not pieces whole one from on side to the other where the wheel would dangle (to get more clearence) un did the exhauste motor mounts
used a floor jack with a peice of wood on the harminc balacer to lift my motor and slid the pan out... that was then now I have a shop with a cherry picker this was a driveway fix when I was young and dumb
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