Oil pump . - JeepForum.com

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post #1 of 29 Old 07-11-2013, 02:59 PM Thread Starter
Jramos43
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1996 ZJ 
 
Join Date: Feb 2013
Location: El Paso
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Oil pump .

How do I go on about changing the oil pump ? Can I do it myself or do I have to go to a shop. ?


96 ZJ
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post #2 of 29 Old 07-11-2013, 03:15 PM
AnotherRedZj
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That depends on how mechanically inclined you are....its do'able for sure.....but a pita!

96 ZJ sittin up 6" on 35's with 4:56's and a 12k winch. Cuz...why the hell not!?
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post #3 of 29 Old 07-11-2013, 03:17 PM
newfieZJ
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Depends on how comfortable you feel with your tools , what you have for tools , what kind of set up you have to be safe to work under the jeep , and your sense of adventure , .

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post #4 of 29 Old 07-11-2013, 03:40 PM
Glasssplinter
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Drop the pan, then 2 or 3 bolts for the pump and you're done. Pan can be a PITA though getting the gasket lined up.

'94 ZJ, 4.0L, 231 TC
Icom V-8000 with 1/4 wave
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post #5 of 29 Old 07-11-2013, 04:55 PM
AnotherRedZj
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Quote:
Originally Posted by Glasssplinter View Post
Drop the pan, then 2 or 3 bolts for the pump and you're done. Pan can be a PITA though getting the gasket lined up.
Hahaha yea, drop the pan. that's the pita!

But after that Jus put some gasket maker around the rear of the block and a cpl dabs in the front corners (I went thick in the back), make sure its seated in the back, then put the gasket on alone finger tight. let it sit up long enough to hold up the gasket when the bolts come out, slip the pan back on and torque to spec.

96 ZJ sittin up 6" on 35's with 4:56's and a 12k winch. Cuz...why the hell not!?
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post #6 of 29 Old 07-11-2013, 05:41 PM
Glasssplinter
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Quote:
Originally Posted by AnotherRedZj View Post

Hahaha yea, drop the pan. that's the pita!

But after that Jus put some gasket maker around the rear of the block and a cpl dabs in the front corners (I went thick in the back), make sure its seated in the back, then put the gasket on alone finger tight. let it sit up long enough to hold up the gasket when the bolts come out, slip the pan back on and torque to spec.
Dropping it is the easy part. Getting it out is another story lol. Can't say how much I fought with it because I couldn't take the steering stabilizer stud out. Good fun and glad it's done.

'94 ZJ, 4.0L, 231 TC
Icom V-8000 with 1/4 wave
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post #7 of 29 Old 07-11-2013, 05:58 PM
Kevinyj95
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Don't forget to prime the pump. When your done take the coil wire off and turn the engine over by starter until you reach oil pressure. Then put the coil wire back on and fire her up. Are you sure its the oil pump? A lot of people do it because the oil pressure drops slowly when the engine warms up. This is a symptom of warn camshaft bearings.

Last edited by Kevinyj95; 07-11-2013 at 06:00 PM. Reason: I aint not speeled it right
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post #8 of 29 Old 07-12-2013, 12:16 AM Thread Starter
Jramos43
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Quote:
Originally Posted by Kevinyj95 View Post
Don't forget to prime the pump. When your done take the coil wire off and turn the engine over by starter until you reach oil pressure. Then put the coil wire back on and fire her up. Are you sure its the oil pump? A lot of people do it because the oil pressure drops slowly when the engine warms up. This is a symptom of warn camshaft bearings.

I get 0 oil pressure reading, I turn on the truck and it marks about 1/4th up the gauge then drops back to 0 and stays on 0 no matter what. I would assume its the pump.

96 ZJ
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post #9 of 29 Old 07-12-2013, 06:54 AM
Kevinyj95
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I would check it with a gauge. How old is the sending unit? Its either the sending unit the gauge or the pump. I would check before going through the bs of getting the pan off. Sending unit takes 5min. Don't run it without oil pressure. Common sense I know but some people like the po of my yj apparently didn't know.
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post #10 of 29 Old 07-12-2013, 07:26 AM
newfieZJ
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I'd check the sending unit also
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post #11 of 29 Old 07-12-2013, 09:50 AM
jnicewan
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The sending unit is cheap and easy to replace, and while its removed you can screw in a mechanical guage to test the actual pressure. It is also a known problem of sludge/debris collecting in the oil passage that the sender screws into. Most people clean this out by using things like pipe cleaners and/or start the engine for a couple seconds with the sender removed to allow oil pressure to blow the hole out ( this method should make a mess of oil so be prepared for that)

If you do decide to replace the oil pump then I would recommend replacing the rear main seal too, you would be right there. Also use the one piece molded rubber pan gasket, not even sure if the other gaskets are still avail.
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post #12 of 29 Old 07-12-2013, 11:37 AM Thread Starter
Jramos43
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How do I check that ?

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post #13 of 29 Old 07-12-2013, 09:56 PM
Kevinyj95
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Either replace it. OR remove it and hook a pressure gauge up to the engine its place to test the oil pump. Its behind the intake manifold. I would almost assume the pressure sending unit. My oil pump in my first 5.2 went at like 300k. You will have to buy a special socket for it. Its cheap. I think sending unit is cheap as well. May want to just replace it.
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post #14 of 29 Old 07-12-2013, 10:48 PM Thread Starter
Jramos43
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Quote:
Originally Posted by Kevinyj95 View Post
Either replace it. OR remove it and hook a pressure gauge up to the engine its place to test the oil pump. Its behind the intake manifold. I would almost assume the pressure sending unit. My oil pump in my first 5.2 went at like 300k. You will have to buy a special socket for it. Its cheap. I think sending unit is cheap as well. May want to just replace it.
People keep telling me that the sending unit and the oil pump are the same thing, whats the difference ?

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post #15 of 29 Old 07-12-2013, 11:41 PM
jnicewan
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Quote:
Originally Posted by Jramos43 View Post
People keep telling me that the sending unit and the oil pump are the same thing, whats the difference ?
The sending unit is what measures oil pressure and turns that into an electrical signal for the oil pressure guage. It is located right behind the distributor and above the oil filter, its a round can looking sensor with a one wire connector on the end. They are known for leaks and failure, also mentioned above some people have had problems with sludge/gunk buildup inside the passage that the sending unit screws into. The pump of course is inside the oil pan.
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