Oil Pressure
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Senior User
Joined: Nov 2004
Posts: 195
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From: Wilton, Ca
Oil Pressure
On my 77 351M as it warmes up the oil pressure dropes.It runes on the low side of the normal range.Is this a ok thing.It has about 27000 on the engine and I have always kept the oil changed and run Valaline 10/30. When its cold it's HI.
I think I'm fine but would like an opion. Thanks Don
I think I'm fine but would like an opion. Thanks Don
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
the factory gauges are more like idiot lights than actual gauges, the only way to tell whats really going on is to put in a mechanical gauge. Most likely your fine though, as long as your not getting any lifter clatter etc.
New User
Joined: Jan 2008
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Sounds normal to me.
There a few variables in Ford gauging systems.
SU/ground/Power impulse
The Engine oiling on 351M/400's was considereda weak point,
Check in the 335 engine forum though as this topic is about the engine not the truck.
There a few variables in Ford gauging systems.
SU/ground/Power impulse
The Engine oiling on 351M/400's was considereda weak point,
Check in the 335 engine forum though as this topic is about the engine not the truck.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Look at your oil gauge and see where the needle rests when the power is off. For many years, Ford has used gauges where the needles rest below the last mark. The only complaint I'm aware of concerned the 1964/66 T-Birds.
The needles on the oil gauges of 64-66 Birds rested 1/4 inch below the low mark when power was off, so the gauge never got anywhere close to the middle except when the engine was first started.
Ford solved the problem by using a different sending unit that read higher than normal...in effect: a false reading gauge sender.
C6SZ-9278-A Sender, Oil Gauge
Have a direct reading gauge that reads low? Use the above sender (if you can find one) for piece of mind. It worked for T-Bird owners.
The needles on the oil gauges of 64-66 Birds rested 1/4 inch below the low mark when power was off, so the gauge never got anywhere close to the middle except when the engine was first started.
Ford solved the problem by using a different sending unit that read higher than normal...in effect: a false reading gauge sender.
C6SZ-9278-A Sender, Oil Gauge
Have a direct reading gauge that reads low? Use the above sender (if you can find one) for piece of mind. It worked for T-Bird owners.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The gages will always read below the last mark when off. That is because LOW oil pressure does not mean ZERO oil pressure. That low mark is probably around 5-10PSI. About the point where the idiot light went ON.
Personally I use a temporary mechanical gage when trouble shooting but I like the stock gage system rather than aftermarket stuff. I also like to hook up an idiot light for a better failure warning. I hook the idiot light to oil as well as temp switches.
There is lots of info on the 351M oiling system in the 335 series engine forum.
Personally I use a temporary mechanical gage when trouble shooting but I like the stock gage system rather than aftermarket stuff. I also like to hook up an idiot light for a better failure warning. I hook the idiot light to oil as well as temp switches.
There is lots of info on the 351M oiling system in the 335 series engine forum.
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Senior User
Joined: Nov 2004
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From: Wilton, Ca
Thanks.
A lot of good info.That is what is good about this forum. Not being a machnic I know I will get the answere. Sometimes it's not what you want to hear,But that's the way it goes.
PS Sorry for the two post(gauges) I lost one while writing it. It was GONE,So I posted another.So goes the back to back post.
Don
A lot of good info.That is what is good about this forum. Not being a machnic I know I will get the answere. Sometimes it's not what you want to hear,But that's the way it goes.
PS Sorry for the two post(gauges) I lost one while writing it. It was GONE,So I posted another.So goes the back to back post.
Don
Mountain Pass
Joined: Feb 2007
Posts: 152
Likes: 1
From: Truth or Consequences, NM
Originally Posted by RDON
Thanks.
A lot of good info.That is what is good about this forum. Not being a machnic I know I will get the answere. Sometimes it's not what you want to hear,But that's the way it goes.
PS Sorry for the two post(gauges) I lost one while writing it. It was GONE,So I posted another.So goes the back to back post.
Don
A lot of good info.That is what is good about this forum. Not being a machnic I know I will get the answere. Sometimes it's not what you want to hear,But that's the way it goes.
PS Sorry for the two post(gauges) I lost one while writing it. It was GONE,So I posted another.So goes the back to back post.
Don
As always JMHO
Last edited by rjent; Feb 20, 2007 at 11:11 AM. Reason: spelling
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New User
Joined: Jan 2008
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It can be as simple as a piece of carbon up against the orifice of the S/U too.
The 351M/400 had a reputation of having oiling problems.
My suggestion: Go with the T'eed in mechanical gauge at the SU on the engine as a reference for when the dash gauge acts up.
The 351M/400 had a reputation of having oiling problems.
My suggestion: Go with the T'eed in mechanical gauge at the SU on the engine as a reference for when the dash gauge acts up.
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