I have a new to me 96 with the 4.0, went to throw on a new filter (mopar mo-090). Same one I have used on my TJ and verified the fit at auto zone . Wouldn’t you know it doesn’t fit!? The filter that came off the xj was a wix 33390 (m20/1.5 threads). Looking at the two filters the thread size is obviously different and the mopar is wider. I don’t see the wix 33390 being a comparable filter for the 4.0 any advice on what’s goin on here?

 

see link...
https://www.quadratec.com/jeep-repla...ilters.php#nm2

you apparently have on early XJ oil filter adaptor on your engine. the 1990 takes the k and n hp 2007 filter with the metric thread. the 1996 is supposed to use the hp 2004, which uses SAE threads.

https://www.knfilters.com/hp-2004-oil-filter

https://www.knfilters.com/hp-2007-oil-filter

wix 3390 appears to be a tractor filter, no bypass is listed for it, not correct for cherokee, dont use it, see below...

https://www.wixfilters.com/Lookup/PartDetails.aspx?Part=140588



wix 51626 is correct for early jeep xj, it has a bypass, see below....

https://www.wixfilters.com/Lookup/PartDetails.aspx?Part=102374

click on "all application" key on above links to see that 51626 is correct for early cherokee, and on 33390 link to see it is NOT listed for any cherokee, rather tractor or industrial engines ( which may have an engine bypass)



I run the hp 2007 in my early xj, a 1990. i cut filters open and found k and n to make very nice filters i run them on many of my cars. wix also makes good filters.

likely any filter rated for a 1990 jeep xj will work for you.

remember just cause the filter fits the threads, and seals on the engine, that does not mean it is correct. bypass pressure maybe different, ( sometimes bypass is done in the engine rather than in the filter) and maybe the filter includes or excludes a drainback valve, depending on filter orientation the valve may or may not be required. Thus the wix 33390 you have although it fits, is NOT correct for any cherokee.
. So always get a filter that matches or exceeds original factory specification.

keep jeeping

 

well that makes sense. I will give that a whirl and see how it works out. I appreciate the response

 

ps see added info in my prior post, your wix 33390 is not correct either, it fits, but wrong specification. see edited post.

 

As usual I am totally confused.
Why does it look like that Wix filter is a spin on fuel filter?

https://www.google.com/search?q=3339...TF-8#cobssid=s

 

It is a fuel filter...good googling!..lol

 

So it gets weirder! I got a metric filter and put it on. Filled up the oil and finished the change. Went to start and the jeep blew the filter off!?. It also high revs but I am sure that’s cause of the lack of oil pressure or oil leaking.

 

You might want to take the block casting number off the motor and decode it.

The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.
Build Date Code
The digits of the code identify:
1st Digit-The year (8 = 1998).
2nd & 3rd Digits-The month (01 - 12).
4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
6th & 7th Digits-The day of engine build (01 - 31).

 

53020515 N.V.H

is the number on the block the drivers side by the motor mount

 

The correct filter for a 1996 is a Wix 51085, which has a 3/4" thread. An M20 is slightly larger than 3/4" and will probably thread on but will likely pop off. That's why they added stickers on the firewall warning that the filter thread changed. The correct filter might be reluctant to thread on if the threads are buggered from using the wrong filter.

That 33890 fuel filter is a 10-micron, versus 20-micron for the 51085. They both have similar flow ratings, but I suspect a fuel filter might cause lower oil pressure because it will not flow fast enough and likely plug up faster.

 

The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.

 

Or 1988 - My '88 has 806MX29

 

Here's the simple fix:CRUISER'S MOSTLY RENIX TIPS

RENIX OIL FILTER TO SAE FILTER

JANUARY 3, 2016 CRUISER54 9 COMMENTS EDITTired of having a poor selection of oil filters for your Renix Jeep? Limited availabilty a pain for you? 20mm threads? We don’t need mumblemeter threads on our oil filters.

Here’s a simple mod that allows you to use the very popular SAE threaded oil filters which are more readily available. The old standard 3/4″ SAE thread.

You can purchase a new oil filter nipple from the dealer for under $10 and never be bothered again. Part number 53007563AB. It’s the one on the left.

Or, grab one off a 91 and later XJ at the junkyard. Be forewarned though. You need a 7/8 wrench to remove a Renix nipple, but a 15/16 wrench for the later style.

And just in case you need to replace your oil filter adapter o-rings, here’s a handy guide.

Oil Filter Adapter O-Ring Sizes
87-90 Renix Model O-rings

0.799 x 0.103 AS568 size -117
1.296 x 0.139 AS568 size -219
2.484 x 0.139 AS568 size –230

Dealer Part Numbers for Renix. Sold individually:

33002970, 33002971, 33002972

Renix kit from Crown Automotive-33002970K

91-01 HO Model Orings

0.676 x 0.070 AS568 size -017
0.859 x 0.139 AS568 size -212
2.484 x 0.139 AS568 size -230

 

Note from DJ

If you gave the starter an oil bath my advice is remove the starter and take it apart and give it a bath with brake cleaner! Then lube the bearing area then reassemble the starter and reinstall the starter.

The starter hates a bath in oil and shorting its life considerable.

 

Motorcraft FL1A is what I use.