Need info on 251 engine

[Bob Carriere]

Bonjour Michel

The oil line that goes to the oil filter has the pressure sensor conencted there..... the line that leaves the bottom of the filter is the return clean oil line to the engine and has even lower pressure.

It could be the electrical connector is contaminated with oil and you have a bad connection.

Have you tried installing a cheap mechanical gauge from Canadian tire.

You just need to instal a tee fitting between the oil line and the filter...connect the mechanical gauge to the tee fitting and you should get a reading that you can compare to the electrical gauge. If you have no knocking sound to the engine the temporary gauge may be a good way to do a test to see if the electrical guage is good.... or you maybe able to remove the existing sensor switch and instal a fitting to connect the mechanical gauge.....

Good luck

Boob

[Michel D]

all ready did it! same thing! the thing is this engine is not connected like yours
the 2 others are connected like yours.
this one is connected near the front of the engine under the alternator!
I would like to no if other pepole are connected like this!

[Bob Carriere]

Hi Michel

I went back to look at your diagram...... are you saying you have an external oil line that runs from the front of the engine,,,,, somewhere behind the big generator.....???

I have never seen that before...... not typical of any Dodge flat head whether it is a 207, 230, 251 or 265.......

Do you have a digital picture of the set up.......must go back to check some books....

Bob C.

[Michel D]

This is the picture!
i think this may be the problem i also have a 237 in a welder and has the same problem!

[Michel D]

I was wondering if the engine bearings and pistons are the same on a
251 1967 wm300 power wagon


Engine parts list:http://www.power-21.com/federalmogul...aspx?pc=Engine

[Michel D]

Well i think this engine will need to be restored!
20w50 seems to be better the pressure is at 25 psi hot!

Dose some body no were y could find a cummins 4bt

[Phil Waterman]

Was just talking to one of the guys in our MV club who is a old line Dodge Nut. Was asking him what he saw on his M37 as oil pressure. Read him a couple of the posts.

He had two good questions:

Have you dropped the pan yet to see if you have sludge? I could not remember if you said the engine had been apart. His thought was if the screen is picking up a sludge this could cause the fluctuations.

His second thought about the fluctuations was is it the correct filter and is it in new?

All this from a guy who is talking on his phone stuck in a traffic jam in Boston.

Cheers

[Lynn Eades]

Try pulling your oil pressure bypass valve out. Make sure it moves freely in its bore, and that the spring is not broken or catching.
I am not familiar with this model, but the pressure characteristics indicate excessive clearances. If you tear it down, don't overlook the cam bearings.