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XJ Ask the Question Thread
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Properly functioning cap will allow coolant to be sucked in from the reservoir bottle. Overheating can be a lot of things.
Junior Member
Joined: Feb 2014
Posts: 88
Likes: 1
From: Washington
Year: 1990
Model: Cherokee
Engine: 4.0
At the JY the other day picking up some "new" fender flares and other misc pieces for my daughters '90 XJ. Decided to grab a power steering pump for my S-I-L's '97 XJ as his was squealing pretty bad. Walking by a '98 ZJ, saw identical pump, pulley, etc made me think about his.
I pulled it out and took it home. It had red fluid in it, and after getting home and doing a little google searching I see that this was probably the correct stuff and not ATF like I was thinking some idiot must have put in it. (Never seen or dealt with red p/s fluid before!)
Since his XJ runs the older clear...ish fluid, I flushed and cycled the pump before installing it. Will this cause him any grief later on, or are the two fluids compatible? (I cycled the pump until it ran clear, so not really any red left in it anyways).
I pulled it out and took it home. It had red fluid in it, and after getting home and doing a little google searching I see that this was probably the correct stuff and not ATF like I was thinking some idiot must have put in it. (Never seen or dealt with red p/s fluid before!)
Since his XJ runs the older clear...ish fluid, I flushed and cycled the pump before installing it. Will this cause him any grief later on, or are the two fluids compatible? (I cycled the pump until it ran clear, so not really any red left in it anyways).
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
At the JY the other day picking up some "new" fender flares and other misc pieces for my daughters '90 XJ. Decided to grab a power steering pump for my S-I-L's '97 XJ as his was squealing pretty bad. Walking by a '98 ZJ, saw identical pump, pulley, etc made me think about his.
I pulled it out and took it home. It had red fluid in it, and after getting home and doing a little google searching I see that this was probably the correct stuff and not ATF like I was thinking some idiot must have put in it. (Never seen or dealt with red p/s fluid before!)
Since his XJ runs the older clear...ish fluid, I flushed and cycled the pump before installing it. Will this cause him any grief later on, or are the two fluids compatible? (I cycled the pump until it ran clear, so not really any red left in it anyways).
I pulled it out and took it home. It had red fluid in it, and after getting home and doing a little google searching I see that this was probably the correct stuff and not ATF like I was thinking some idiot must have put in it. (Never seen or dealt with red p/s fluid before!)
Since his XJ runs the older clear...ish fluid, I flushed and cycled the pump before installing it. Will this cause him any grief later on, or are the two fluids compatible? (I cycled the pump until it ran clear, so not really any red left in it anyways).
Seasoned Member
Joined: Oct 2012
Posts: 414
Likes: 3
From: Minnesota
Year: 1998
Model: Cherokee
Engine: 4.0 Liter Inline 6
Very good, you learned basic high school fluid dynamics. Do you want a gold star?
When the oil pump is pushed to create more flow, there is greater resistance against that flow because bearings and clearances do not get larger. The relationship is not linear. As a result, the pressure increases.
When the oil pump is pushed to create more flow, there is greater resistance against that flow because bearings and clearances do not get larger. The relationship is not linear. As a result, the pressure increases.
And the reason the oil pressure sending unit reads a higher pressure is because it is not located inside the engine where the oil is flowing with a higher velocity right?
Like a narrow nozzle on a garden hose. The water in the hose right before it narrows (where the oil pressure sending unit is metaphorically) has a higher pressure than the water flowing through the narrower nozzle because it has a lesser velocity and is "pushing" it into the narrower nozzle? Like the oil pump pushing the oil through the engine correct? And the pressure keeps getting greater exponentially with more force from the oil pump?
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6