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Unread 05-29-2007, 07:18 PM   #1
eyebrowski
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2000 Cherokee Oil Pressure

I am getting a low oil pressure reading when warm and idling. Where can I tap in to check the oil pressure mechanically? There is a plug on top of the oil filter assembly with a brass fitting, can I tap in here? Does anyone know the thread size? Thank you.

Greg

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Unread 05-29-2007, 07:19 PM   #2
Dannyboy18
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How low? My brother's dips down to around 20-30 when it's fully warmed up and idling. Mine does the same.
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Unread 05-29-2007, 07:24 PM   #3
curtjames37
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ENGINE OIL PRESSURE CHECK
(1) Disconnect connector and remove oil pressure sending unit.
(2) Install Oil Pressure Line and Gauge Tool C-3292 or equivalent. Start engine and record pressure.

The FSM states that a min of 13 psi at 600 rpm and 25-35 psi at 800 rpm is required. The first step listed in diagnosing low pressure is the replacement of the sending unit.
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Unread 05-29-2007, 07:27 PM   #4
eyebrowski
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It reads practically nothing on the oil pressure gauge and the check engine light comes on. There is no noticeable mechanical noise to indicate a problem and I just had the oil pump replaced.

Is the oil pressure sending unit the connector on the filter assembly I am referring to in my first post?
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Unread 05-29-2007, 07:28 PM   #5
curtjames37
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Quote:
Originally Posted by eyebrowski
It reads practically nothing on the oil pressure gauge and the check engine light comes on. There is no noticeable mechanical noise to indicate a problem and I just had the oil pump replaced.

Is the oil pressure sending unit the connector on the filter assembly I am referring to in my first post?
Yep. Chances are it just needs replaced. They are kind of notorious for going bad.
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Unread 05-29-2007, 07:46 PM   #6
eyebrowski
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Does anyone happen to know the thread size/type on that fitting?
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Unread 05-29-2007, 08:05 PM   #7
eyebrowski
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1/8 NPT maybe?
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Unread 05-29-2007, 09:08 PM   #8
severous01
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Quote:
Originally Posted by eyebrowski
1/8 NPT maybe?
no, it's a special socket designed for chrystler only sending units. you can use a metric (18 or 19), but it's not a direct fit and if it's on there good you'll round the corners. i had to 'borrow' a special socket for mine....didnt want to come off.

but if you're talking about the metal part that's attached to the metal part that actually screws into the oil filter adapter...that's a standard pipe fitting...NPT, and i'm thinkin maybe 1/4 or 5/16.
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Unread 05-29-2007, 09:12 PM   #9
curtjames37
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Yeah, I think it is a little bigger than 1/4 so 5/16 might be it. Don't quote me on that though I am just going from memory so it might not be accurate.

I got the sending unit off with a pair of channel locks.
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