bkdrocks Posted January 18, 2010 Share Posted January 18, 2010 My 88 MJ 4.0 had a STP filter on it when I bought it(part #3985 I think),I bought a Wix and a Napa filter (51626 and a 1626)neither fit,but it was the correct part number.I bought another STP it screw right on??? I didnt know if maybe someone changed the filter base or if its a common problem.I need to post a pic of the filter base . Has anyone else ran into this? Link to comment Share on other sites More sharing options...
1986Comanche Posted January 18, 2010 Share Posted January 18, 2010 My 88 MJ 4.0 had a STP filter on it when I bought it(part #3985 I think),I bought a Wix and a Napa filter (51626 and a 1626)neither fit,but it was the correct part number.I bought another STP it screw right on??? I didnt know if maybe someone changed the filter base or if its a common problem.I need to post a pic of the filter base .Has anyone else ran into this? I don't understand why the Wix 51626 or the Napa 1626 (Also made by Wix) wouldn't fit. The STP S3985 cross references to the Wix 51626 and the Napa 1626. The filter adapter has metric threads. Are you sure the STP filter that was on it was an S3985? Link to comment Share on other sites More sharing options...
Eagle Posted January 18, 2010 Share Posted January 18, 2010 Is the oil filter on your engine upside down, or horzontal? Link to comment Share on other sites More sharing options...
bkdrocks Posted January 19, 2010 Author Share Posted January 19, 2010 Horizontal,I tried 2 different ones from wix thinking that maybe I had gotten filter with bad threads or something.But the STP went right on??? I'm thinking somewhere along the way the filter adapter or atleast the threaded piece has been changed out.I guess my next trip to Pull a parts I'll look for a filter adapter that has a 1626 filter installed.... Link to comment Share on other sites More sharing options...
Eagle Posted January 19, 2010 Share Posted January 19, 2010 Horizontal,I tried 2 different ones from wix thinking that maybe I had gotten filter with bad threads or something.But the STP went right on???I'm thinking somewhere along the way the filter adapter or atleast the threaded piece has been changed out.I guess my next trip to Pull a parts I'll look for a filter adapter that has a 1626 filter installed.... Right you are. The '88 oil filter is a metric thread, and the filter mounts upside down (threaded opening toward the ground). Chrysler changed to an SAE thread on the filter in 1991, and at the same time changed the filter adapter so the filter sits horizontal (threaded opening facing forward). The filters are NOT interchangeable. If you have the horizontal mount, you probably need a filter for a 1991 thru 2001 Cherokee. Link to comment Share on other sites More sharing options...
87Warrior Posted January 19, 2010 Share Posted January 19, 2010 Try the Napa Gold 1515 or Mobile1 M1-204. These are the filters I run on my '92 MJ and '03 TJ. Link to comment Share on other sites More sharing options...
1986Comanche Posted January 19, 2010 Share Posted January 19, 2010 Horizontal,I tried 2 different ones from wix thinking that maybe I had gotten filter with bad threads or something.But the STP went right on???I'm thinking somewhere along the way the filter adapter or atleast the threaded piece has been changed out.I guess my next trip to Pull a parts I'll look for a filter adapter that has a 1626 filter installed.... If you have the horizontal filter mount then you can't have the STP S3985 filter on there. The STP S3985 comes up as the correct filter for a 1988 Jeep Comanche with a 4.0L, This filter will not fit the horizontal filter mount because it has metric threads. Link to comment Share on other sites More sharing options...
j440 Posted January 19, 2010 Share Posted January 19, 2010 I ran into the same problem in the early '90's when I had an '87 Wrangler with a 4.2. Neither Wix nor Fram (I wouldn't buy a Fram now anyway) would fit. I had to buy a filter made by Purolator or go to the dealership. Even though the number on the others say they would fit, they would not. If you will look, I would bet that the number listed on the Wix is the same as the number listed for a '91 or later. As far as how the oil filter adaptor is turned, I have a verticle filter on my '92 4.0 engine and it has the standard threads. It does't have anything to do with the question but here is a very interesting article on oil filters. http://minimopar.knizefamily.net/oilfilters/index.html Link to comment Share on other sites More sharing options...
1986Comanche Posted January 19, 2010 Share Posted January 19, 2010 I ran into the same problem in the early '90's when I had an '87 Wrangler with a 4.2. Neither Wix nor Fram (I wouldn't buy a Fram now anyway) would fit. I had to buy a filter made by Purolator or go to the dealership. Even though the number on the others say they would fit, they would not. If you will look, I would bet that the number listed on the Wix is the same as the number listed for a '91 or later. As far as how the oil filter adaptor is turned, I have a verticle filter on my '92 4.0 engine and it has the standard threads. It does't have anything to do with the question but here is a very interesting article on oil filters. http://minimopar.knizefamily.net/oilfilters/index.html Wix lists on their site the 51085 for the 1991 and later 4.0L and the 51626 for the 1987-1990 4.0L. Link to comment Share on other sites More sharing options...
j440 Posted January 20, 2010 Share Posted January 20, 2010 Oh. I had never checked the part numbers. I never was a very good guesser. :oops: Link to comment Share on other sites More sharing options...
Eagle Posted January 20, 2010 Share Posted January 20, 2010 As far as how the oil filter adaptor is turned, I have a verticle filter on my '92 4.0 engine and it has the standard threads. Got a photo of your engine? Can you read the build code off the passenger side? It shouldn't have a vertical oil filter, but it may be a replacement engine, or it may be a replacement oil filter adapter. Link to comment Share on other sites More sharing options...
Geonovast Posted January 20, 2010 Share Posted January 20, 2010 Every 4.0 my family's had (4 Renix, 5 HO) had a vertical oil filter. Link to comment Share on other sites More sharing options...
mvusse Posted January 20, 2010 Share Posted January 20, 2010 My 87 Comanche is vertical, as is my buddy's 90 Cherokee. My 94 Cherokee as well as a friend's 96 are both horizontal. Link to comment Share on other sites More sharing options...
bkdrocks Posted January 20, 2010 Author Share Posted January 20, 2010 Well mines horizontal,I will get pictures later of the filter adapter.the s3985 fits and the 1626 won't... I don't know if the engine has been replaced I do know it was an automatic truck in its earlier days. So when I get to work I will try to get a picture of the filter base and find the number on the block to se what year the engine is. Link to comment Share on other sites More sharing options...
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