Oil Pressure and Water Temperature sending units

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
My gauges were not working and looks for a long time. PO installed an aftermarket mechanical temperature gauge which was way off on dial from it should be for JFJ40. I traced it down to the rear plug at the engine valve cover/block location. He installed also aftermarket pressure gauge, but never connected it.
I upgraded my dash with new electrical gauges. They do come with their sending units.
My question is where exactly OEM locations for Oil Pressure and Water Temperature sending units. I think different locations from OEM can put the measuring off, so prefer to add the to good spots.
Searched the web and forums and seen several places, but can't be sure which one is original.
I'll snap a few shots of what I have on my 2F now tonight.
Please help. find the right spots.
 

Pighead

Stop calling it an FJ
 
 
Joined
Aug 31, 2004
Messages
7,614
Location
Denverish
I'll snap a few shots of what I have on my 2F now tonight.
Please help. find the right spots.
Yes, pics would help.
Either of the 2 threaded ports on the top of the head will work for a water temp sender. Oil pressure sender could be in a couple of different places depending on what motor you have. If it really is a 2F motor, does it have an oil cooler? If you have an F engine, original for a '74, the oilpressure sender would be on the drivers side rear of the engine block. If it's a 2F, could be on the oil cooler or on the oil filter mount if you have no oil cooler.
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
It's 2F. Even the head has big "2F" stamp.
One of the PO replaced original F with 2F. I'm not sure what year is 2F, PO believed it was out of '78.
 
Joined
Jan 3, 2012
Messages
92
Location
Nebraska
i've got a 2F in a 77 oil sending is right below the filter single plug with 1 electric wire running to guage:excellent reading as well as the temp. like pighead said theres 2 threaded ports on the top of the head towards firewall thats where mine is works excellent. i do however have factory guages
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
Here are the pictures I snapped tonight.

Water temperature sensor:


Can't fin an Oil Pressure Sensor. Looked from underside on both sides, can't see. Here is the image from the top. Can someone point me a location and show how it suppose to look?


Here are the sensors from the CruiserUser Dash kit:
 

Pighead

Stop calling it an FJ
 
 
Joined
Aug 31, 2004
Messages
7,614
Location
Denverish
Can someone point me a location and show how it suppose to look?
Pay no attention to the oil leak I'm pointing at, look at the plumbing "T" and where it screws into the oil filter mount...that is one place your oil pressure sender could be.
here 002.jpg
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
Pay no attention to the oil leak I'm pointing at, look at the plumbing "T" and where it screws into the oil filter mount...that is one place your oil pressure sender could be.
It's kind of hard to see spot when on the vehicle. I have some sort of steel splash guard on top of the driveshaft mounted at around 30-45 degrees covering the right side of the engine from underneath. I looked yesterday at that side, didn't find anything, but I wasn't sure of location. Now I know where to look, so I can narrow my search.

I did try to change the Water Temperature sensor last night to realize that I need to drain coolant first as the sensor is not on the highest point, so as soon as I start unscrewing it, I got a steady flow of green "fall" on my engIne block.
I'd assume I'd need to drain oil as well for the Oil Pressure sensor...
 

Trollhole

THC
Supporting Vendor
Moderator
 
Joined
Mar 6, 2005
Messages
20,834
Location
Mauldin, SC
Depending on the year which if the parts on your 2f are correct your oil pressure port could be on the drivers side near the block drain plug. Early 2f's had it there.
 

Pighead

Stop calling it an FJ
 
 
Joined
Aug 31, 2004
Messages
7,614
Location
Denverish
Depending on the year which if the parts on your 2f are correct your oil pressure port could be on the drivers side near the block drain plug. Early 2f's had it there.

I did not know that, but I believe it. That's where the oilpressure sender was on my original 12/'74 late F engine. And my 2F block, 2F 098203, (mid '76) has a threaded hole there that accepts the oilpressure sender but apparantly does not communicate with an oil passage. Which can be somewhat disconcerting when starting a rebuilt engine.
So there ya go AlexJet, you got 3 choices of places to look for your oilpressure sender. Drop that splashpan, look around your oil filter. Did you ever tell us if you had an oil cooler or not? and look on the rear driverside of the block. Did you ever post the engine number of your mystery block? You know, we could probably magically tell you the month and year of that block if we only had the number...

Edit: looking at your pics again, and the lack of plumbing to that side of the block says no oilcooler...
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
I'm not sure it has oil cooler. I looked on-line and it refers to rectangular box mounted on the block rear of oil filter. I don't see it.
I need to see the engine number. Where should it be stamped?
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
Ok, I looked once more and still don't see the Oil Pressure sender... :(

My engine # 2F 424118
 

John McVicker

SILVER Star
 
Joined
Jul 11, 2005
Messages
2,716
Location
Big Pine, CA
Oil sending unit on my 2/'75 orig engine 2f is located :

1) Driver side (LHS) of the block.
2) Directly below the # 6 exhaust port.
3) On line with & just forward several inches, of the block drain plug.

Look there.

John
 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
I gone through my RHS of the block this afternoon - nothing, not a single trace of anything, plus my filter holder doesn't have a plug for a sensor as was mentioned here.

So I followed John's suggestion and examine the LHS,...and I did find something and that was all I found. Its an adapter or sort of it with a bolt screwed in as a plug, at least it looks like this. Location is 1/3 of the way up from the bottom of the block at the parallel level of the Master Brake Cylinder.
See pictures for details. Kind of bad quality cell phone, I'll try to shoot better with the camera.

Is it the point I'm in search for? Can it be that PO just removed the sensor as gauge wasn't working anyway?... probably...



 

AlexJet

 
Joined
Jan 29, 2008
Messages
1,328
Location
Toronto, ON
Better close up pictures:
I hope that's it, as I'm out of options....
Could someone take a look and confirm?



 
Top Bottom