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Unread 04-11-2010, 09:31 PM   #1
boyce1911
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1977 FSJ Wagoneer 
 
Join Date: Jun 2008
Location: Kingman, Arizona
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need tips for oil pressure sending unit.

Tonite I was priming the oil pump on my freshly rebuilt 258 and when the pump caught prime the oil pressure sending unit started spurting oil out. Is there any tips or advice for changing this out?? like special thread sealant, can I spin the whole unit out of the block (2 switches on a big square brass looking fitting) or do both switches come out independantly?

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Unread 04-11-2010, 10:04 PM   #2
ritjobbie
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The whole thing spins right out of the block. It's a PITA to reach sometimes. If you have a REALLY REALLY deep 1" (or 1 1/8"?) socket, that'll fit.
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Unread 04-11-2010, 10:04 PM   #3
92yjpittman
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1992 YJ Wrangler 
 
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yes you can take it out best thing to do is buy a mechanical gauage and install it so you dont have to worry about the sending unit going bad and leaking oil everywhere. i installed mine yesterday cost around 20 bills and is pretty easy to install
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Unread 04-11-2010, 10:13 PM   #4
boyce1911
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So, if I go with a mechanical guage I can do away with both of those switches at that location along with their wires?
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Unread 04-11-2010, 10:58 PM   #5
92yjpittman
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if its like my 2.5 you can
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Unread 04-12-2010, 06:26 AM   #6
dodger889
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You have two sending unit? That is sorta odd but not uncommon. One goes to the gauge and the other sounds like it goes to an light for if the pressure drops below a set point. This would have been an add on item that was done by some one. Which would be an easy way to get your attention in case of an pressure loss or a kill switch. Now you could remove the two sending unit and tighten down the block and pipe to where it is seated.
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Unread 04-12-2010, 07:33 AM   #7
RollTideYJ
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Quote:
Originally Posted by boyce1911 View Post
So, if I go with a mechanical guage I can do away with both of those switches at that location along with their wires?
If yours has two wires coming out of it, then one is for the oil gauge, and the other operates the electric choke. Thats how my 4.2 works.
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Unread 04-12-2010, 11:47 AM   #8
wendell
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A mechanical gauge isn't a fix all as far as oil leakage. The plastic line can get a leak from the engine to the gauge. It can get a leak under the dash and get on the floor. If you go the mechanical route, just make sure the oil line isn't pinched or in a place where it will get rubbed alot.
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Unread 04-12-2010, 06:03 PM   #9
boyce1911
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1977 FSJ Wagoneer 
 
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Guy at parts store looked both pieces up and one is oil pressure and other is oil light. $44 for both but mechanical guage is $15 so thats what I walked out with. Only to come home and read that other part might go to electric choke?? if that is the case all I have to do is take out the plug I bought and get the right part.
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