dave1123

Anybody got a source for Viton o-rings for the filter adapter for the XJ? I can find any number of rubber ones, but I only want to do this ONCE!

robertj

What's wrong with Mopar?



Three years ago and still no leak.

I've never heard of an alternative to rubber seals. Please enlighten me.

dave1123

Highly volatile fluids like petrol or hydraulic fluids need Viton or Nitrile o-rings that don't deteriorate or turn brittle from high heat or the components in the fluid. These are mostly used in aviation or high pressure hydraulics. If you use natural rubber in aviation, you're asking for a fire. For instance, the o-rings used on fuel injectors are Viton. I know for a fact that I can get a standard set of Mopar o-rings and take them to a hydraulics shop and get Viton o-rings the same size, but that takes time and wasted money for the stock set. I know the ID of the stock rings, but I don't know the diameter (gauge) of them. are they 1/8, 5/32, 3/16 or equivalent metric sizes? Also what is the size of the big one? I prefer to do this once.

I've been thinking. XJ's seem to have a problem with low oil pressure at idle, more than the late model WJ's which have the filter screwed directly onto the side of the block. I'd be willing to bet this is caused by the 2 small oil holes in the side of the banjo bolt that mounts the adapter. If you drilled 2 more holes or made them larger, you'd weaken the bolt. I'm saying these holes restrict the oil flow at idle. Just my opinion.

s346k

i think no matter which ones you get they’re only going to be good for 125k +/- miles. i did mine at 129k miles and i noticed it starting to slobber again around 260k. i’m at 270k now and it’s leaking pretty good. i used a mr gasket o-ring last time, it fit and worked perfect for a good bit.

Stevo1971

4 years ago I got a combo set of o rings and gaskets for various makes and models (including the XJ 96-87) at Advance Auto.
Just did the job today and needed a 9/16 bit not a T60
I've got a 93 XJ

robertj

I've seen low oil pressure at idle for a couple of the 4.0s (One TJ and the other an XJ) I've owned. Oddly enough, they were both brand new purchases and low mile vehicles. My current '96 with nearly 200k miles keeps 35 to 40 PSI with no problems at any temperature or RPM. I have no idea what the low pressure at idle issue is on some 4.0s, but I'd be interested in reading about people that have improved that by any method.

dave1123

My 2000 XJ had 126K miles on it when I bought it last February (2018) and it had 30 psi cold at idle but went down to 10 hot. I put Rotella T6 5W40 oil in it and changed the oil pressure sensor with a Mopar one. Now it holds 30 psi hot at idle and jumps to 50 at anything over 30 mph. I'm using a Purolator One filter and changing the oil every 5K. I'm watching the coolant like a hawk because it's got the 0331 head on it and I don't want to lose the motor!

BTW, I just bought a Mopar set of adapter o-rings (part # 0472 0363) for $16.20 + tax. (made in Mexico) I'll get the sizes and numbers for Viton or Buna N rings for next time. Buna N are used in high pressure hydraulic systems and Aerospace applications.

dave1123

Okay, here's the skinny on the o-rings. Mopar are Buna N Nitrile which is the most common material for o-rings. The AS568 series numbers are 017, 212, and 230. The 3 sizes are;

017--.070 X .676 X .816

212--.139 X .859 X 1.137

230--.139 X 2.484 X 2.762

IDK what other suppliers o-rings are made from, but I've been lead to believe most o-rings made for petroleum are Buna N Nitrile at least. The reason I questioned this is Rockauto lists them as rubber. Nobody uses natural rubber for o-rings anymore. They probably never did!

BTW, the temperature tolerance range of Buna N is +250*F to -30*F

robertj

Thanks for the information and research. Let us know how this project works out.

dave1123

I think this project has taken care of itself. Buna N Nitrile is good enough for motor oil so anything else is just overkill. Why go to the expense of some exotic material for no gain. Stock o-rings will last long enough for our purposes. The whole point I wanted to make is buying them from a hydraulics shop they will cost about 50 cents each whereas buying them from Mopar the 3 piece kit costs $16.

awg

I think its the big one that causes a leak. I had what appears to be a viton outer in one of mine..it was squashed into a flat section, and leaked cause of that,
the specialist assured me it would have started round. I live in an Industrial town and can buy most seals, bearings, o-rings etc etc over the counter, usually way cheaper

Also, in a kit I ordered, none of the smaller o-rings fitted one of the inner o-ring positions on one of my '96

DFlintstone

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

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

The generic assortment "kit" from Orilies was worthless for my Renix.

BlueRidgeMark

Sounds reasonable. I notice that my new WJ (2002) does not have the right angle adapter. The PO has a shorty filter on it. I'll be changing that to a larger filter with the next oil change. Should be interesting to see what the oil pressure is before and after.

dave1123

I'm using the Purolator One P14670 (?) on both my 2000 WJ and my 2000 XJ. It's the same size as the Mopar specific one. I am using Rotella T6 5W-40 Synthetic Diesel oil in both. They both hold 50 psi on cold start-up and 50 psi at anything over 1500 rpm. However, the WJ holds 45 at idle hot and the XJ will drop down to 30 at idle hot. When I bought the XJ about a year ago, the oil pressure was 40 on startup and 15 at idle hot. It went up to only 35 at over 1500 hot. It had an unknown oil in it that looked like 10W-30 and had a leaky oil pressure sensor. I spent $70 for a new Mopar specific oil pressure sensor and the present oil. It has 130K miles on it now whereas the WJ has 253K miles on it. The WJ has a serious problem in one cylinder that I think is a cracked piston skirt so it's getting a rebuilt shortblock.

I don't think the size of the filter has any effect on oil pressure, but a small one will load up with contaminates faster. Any filter with a 3/4-16 thread and a 2.750" gasket will work on the 4.0.

89Laredo

74 cents