Oil Pressure woe's
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Oil Pressure woe's
I've read through the other threads on this but still have a question. Just installed a manual oil pressure guage on my 351M, on start-up was able to watch the oil fill the tube, took about 30 seconds. Then the needle just moved off the stop, about 6 psi, at rpm. After warmup next to nothing, even at rpm.
The engine sat in a shed for about a year on its backside, flywheel, before install. Lifters are all noisy at startup and even worse after warmup.
Aside from pickup tube and bearings, what are the odds that the oilways are plugged, and if so is there a way to "blow them out"?
Anything is appreciated.
The engine sat in a shed for about a year on its backside, flywheel, before install. Lifters are all noisy at startup and even worse after warmup.
Aside from pickup tube and bearings, what are the odds that the oilways are plugged, and if so is there a way to "blow them out"?
Anything is appreciated.
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Junior User
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Paid a mechanic to do the install, so I couldn't say. Ignorant question, will the pump prime itself eventually, i've got about 75 miles on it since install. Was plannin on pulling the pan this weekend to make sure that nothings clogging the pickup tube. I know enough about turnin wrenches to get myself in trouble
Laughing Gas
Joined: Apr 2001
Posts: 868
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From: New Glasgow, Nova Scotia
If you are getting oile pressure on the guage then the pump is providing flow, you can remove a valve cover and see how much oil is comming up through the push rod and lifter. But since it's a 351M , I'm willing to bet that the main and rod bearings are shot. I've had a few 351M's and had to replace the bearings in 3 of them. My current 351M had no oil pressure at all after it was running for about 5 mins, replaced the main and rod bearings and no have great oil pressure even when hot at idle. |Cost is about 200 for parts, labour could be expensive if it's not a 4X4. Good luck
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Ok, I'm a little curious now about my engine. I have a 79 f250 that I assume has a 351m. It has a poinst distributor, which it shouldn't, but that coulda been swapped in. My question is, the oil pressure. I read about the 351m having no pressure, but mine has really high pressure. On a set of Sunpro gauges, it would run 50-60 psi at cruising speed then drop to 20ish at idle. I changed the oil to Valvoline 5w30 conventional and now it starts cold up to 70-80psi, then drops to 50-60cruise and 20-25 at idle. What the heck does that mean?
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Ok, I'm a little curious now about my engine. I have a 79 f250 that I assume has a 351m. It has a poinst distributor, which it shouldn't, but that coulda been swapped in. My question is, the oil pressure. I read about the 351m having no pressure, but mine has really high pressure. On a set of Sunpro gauges, it would run 50-60 psi at cruising speed then drop to 20ish at idle. I changed the oil to Valvoline 5w30 conventional and now it starts cold up to 70-80psi, then drops to 50-60cruise and 20-25 at idle. What the heck does that mean?
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I was just wondering why my pressure was that high when I hear about the 351m having really low pressure. Nice to know it's not just me.
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Speaking from personal experience you need new main and rod bearings and a high volume oil pump. I can't even count the number of 351m and 400 engines in my family that have needed this. My 1977 F-150 with 351m acted just as yours is.
And this last part is my opinion and is the route I went. I don't think a 351m is worth spending $5 on and I'd just swap to a 460 and never worry about your engine again and double the power at the same time.
And this last part is my opinion and is the route I went. I don't think a 351m is worth spending $5 on and I'd just swap to a 460 and never worry about your engine again and double the power at the same time.
Laughing Gas
Joined: Apr 2001
Posts: 868
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From: New Glasgow, Nova Scotia
Speaking from personal experience you need new main and rod bearings and a high volume oil pump. I can't even count the number of 351m and 400 engines in my family that have needed this. My 1977 F-150 with 351m acted just as yours is.
And this last part is my opinion and is the route I went. I don't think a 351m is worth spending $5 on and I'd just swap to a 460 and never worry about your engine again and double the power at the same time.
And this last part is my opinion and is the route I went. I don't think a 351m is worth spending $5 on and I'd just swap to a 460 and never worry about your engine again and double the power at the same time.
What he said. Pefect idea, I removed the 351M and put in a 429, same gas milage but fastest truck I ever owned.
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So what issues are there swapping in a 429 or 460. Currently running a 4 speed. Been told, no experience, that you can't bolt a 460 up to the 4 speed.
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So I found the problem. After pulling the oil pump I had it sitting on the bench, I was walkin by latter when I actually looked at it, 3 of the 4 bolts that hold the plate on were loose letting the plate gap by just under a 1/16 on 2 sides. Tightened them up, put it back together and now after warmup I've got about 25psi and around 50 at rpm. Thanks for the input but it looks like swapin in a 460 will have to wait 
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