Wheres the oil sending unit a 351M? - Ford Bronco Forum
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post #1 of 7 (permalink) Old 06-17-2010, 02:15 PM Thread Starter
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Wheres the oil sending unit a 351M?

I am kinda new with all this. I have been looking for the oil sending unit on my 79 with a 351M, I think I finally found it on the rear of the block. Buts its up high on the block, almost on the intake manifold. Normally they are on the front of the block near the oil filter on the driver side, right? Theres no plug there to take out and no sending unit lookin shapes. Any help would be great

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post #2 of 7 (permalink) Old 06-17-2010, 02:43 PM
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The oil sending unit on a 351M/400 is in fact on the top back side of the block nestled in right behind the intake manifold. It's easier to access with the carb off, but can be gotten with it on. Usually, I just grab a vice grip and get the sending unit to break loose, then it should be easy enough to spin off. You can also get a, I wanna say 1/2", stubby wrench on the bottom of the sending unit as well, but at about an 1/8 of a turn of clearance, you'll be there a little while.
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post #3 of 7 (permalink) Old 06-17-2010, 03:56 PM Thread Starter
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thanks alot, I spose I should have put this question here thanks whoever moved it.

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post #4 of 7 (permalink) Old 06-17-2010, 05:03 PM
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Just make sure you clean off the top off the block around the sending unit as best as possible before you remove the sending unit. A lot of dirt likes to collect around it and you don't want to knock the dirt into the sending unit hole.

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post #5 of 7 (permalink) Old 06-18-2010, 12:09 AM Thread Starter
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I got it all off, and put on the new pressure gauge thanks guys

79 rocking a 351M, 3 inch lift
05 Yamaha Raven R6
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post #6 of 7 (permalink) Old 05-16-2018, 10:53 PM
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THANK YOU!!!!!
I have been looking at schematics and diagrams and everything was down near the fuel pump and oil filter. Now I can swap out the
sending unit and verify that the gauge is working. Yes, I got the unit that is for gauges not dummy lights, apparently, they are different units.

All gauges and speedo working now on my 1978 f150 super cab, tomorrow I strap the 38-gallon tank on, I modified the sending unit using compression fittings!!! better than trying to solder the copper.
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post #7 of 7 (permalink) Old 05-17-2018, 08:51 AM
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Originally Posted by Barnfinder1978 View Post
THANK YOU!!!!!
I have been looking at schematics and diagrams and everything was down near the fuel pump and oil filter. Now I can swap out the sending unit and verify that the gauge is working. Yes, I got the unit that is for gauges not dummy lights, apparently, they are different units.
All gauges and speedo working now on my 1978 f150 super cab, tomorrow I strap the 38-gallon tank on, I modified the sending unit using compression fittings!!! better than trying to solder the copper.
Yo Barnfinder,
For posterity, here is a pic;

"Oil Pressure Sending Unit
This picture shows the oil pressure sending unit on the top rear of the block. The arrow indicates the oil gallery that feeds the sending unit from the rear end of the main distribution gallery (right side lifter gallery).
An external oil line can feed pressurized oil into this port, providing higher oil pressure for the last two main crankshaft bearings.
Using an external oil line will improve the longevity of the main crankshaft bearings, even on a stock-level rebuild."

From Bubba's M-Block Ford V8 Workshop by Dave Resch @ Bubba's M-Block Ford V8 Workshop
See much more info.

Also see 1979 Bronco/F Series Electrical & Vacuum Troubleshooting Manual via topsig (Ziggy) @ 1979 Ford Bronco Wiring Manual pictures, videos, and sounds | SuperMotors.net
Very similar to 78.

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