Oil filter install problem - could the receiver screw have receded? - JeepForum.com
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post #1 of 35 Old 05-09-2020, 11:21 PM Thread Starter
CMahoney
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Oil filter install problem - could the receiver screw have receded?

It seems like a ridiculous thing to ask, but is it possible for the oil filter receiver bolt to screw further into the engine block? I purchased a CJ7 that's been sitting awhile and this is the first oil/filter change. The new filter literally fell off after I thought I completed the change and made a mess of a spill. The thing is I can't even seem to put the old filter on because the receiving bolt is so short. I've never had this problem before with an oil change, but both filters basically hit the block before they have a chance to make some threads. The only thing I can imagine is that I somehow tipped a few threads with the new filter and then the bolt just screwed further into the engine block.

What happened?

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post #2 of 35 Old 05-10-2020, 12:01 AM
80cj
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Yes, I see where it says Made In China. Have you tried another filter? Does the old one screw back on securely? How far is the thread protruding from the block?
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post #3 of 35 Old 05-10-2020, 12:06 AM
John Strenk
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Have you tried to unscrew the threaded section with your fingers?
Looking at the knurled sction on the treads makes me wonder.

Also,
That's an oil filter for the 2.5 liter CJ engine
You need K&N PS-1007 for the 4.2

https://www.knfilters.com/oil-filters/jeep/cj7

https://www.knfilters.com/oil-filter...l-l6-carb/1986


Get the stainless one, It's only $250.00
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post #4 of 35 Old 05-10-2020, 05:02 AM
keith460
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I couldn't find a good picture but where's your Bypass piece that is suppose to be inside the screw-on portion? And yes, that's the wrong oil filter.


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post #5 of 35 Old 05-10-2020, 05:31 AM
Hurricane4
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Try NAPA or WIX oil filters:

https://www.napaonline.com/en/p/FIL1...put=oil+filter

As John said those threads don't look to good.

Try here for parts:

http://www.americanpartsdepot.com/oilpan.htm
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post #6 of 35 Old 05-10-2020, 06:23 AM
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What p/n oil filter did you take off the engine? I bet the previous owner modified the oil filter adapter to utilize the later style versions of oil filters with an internal bypass and deleted the adapters internal bypass or your engine is an 87 or later 4.2l but it appears from your pictures that you have an 86 or earlier 4.2l with the internal bypass missing.

Info here
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post #7 of 35 Old 05-10-2020, 07:42 AM
pedal2themetai
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Hi Yes looking at the picture Keith posted its missing some parts to the by pass.. so maybe the center connection has been put in backwards? Because that knarwled spot should be against the block plate to lock it in place?? something don't look right??
good luck
tim
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post #8 of 35 Old 05-10-2020, 08:05 AM
jeepdaddy2000
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Somebody was definitely in there and gutted the bypass valve. The threaded end looks like a pipe adapter for a hot water heater........
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post #9 of 35 Old 05-10-2020, 08:55 AM
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That nipple should have a shoulder on it in the center, so it won't thread in too far. I bet it isn't the proper nipple, but something someone used in place of a correct one, and it's threading in too far.

Here's one, to utilize a newer filter-
https://www.ebay.com/itm/Oil-Filter-...72.m2749.l2649
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post #10 of 35 Old 05-10-2020, 10:10 AM
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If you decide to remove what you have, you could try an internal pipe wrench.

https://www.homedepot.com/p/Husky-In...B&gclsrc=aw.ds

It tool grips the internal part of the pipe and will tighten or loosen. If the nipple does not come out, you will not have damaged what you have.

You really need to get the correct parts installed.
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post #11 of 35 Old 05-10-2020, 11:49 AM
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Agreed, by the looks of pic 2 the nipple is in backwards. The shorter side should screw into the block where the knurling locks/stops the nipple, keeping the nipple from comming back out when the filter is unscrewed.
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post #12 of 35 Old 05-10-2020, 12:35 PM
StoneTower
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Based on the other posts, the nipple in the block is the incorrect part. The stock part has a hex center that should be used to tighten the nipple and also act as a shoulder to seat up against the bypass parts and hold them in place.

Quote:
Originally Posted by RiverandSand View Post
Agreed, by the looks of pic 2 the nipple is in backwards. The shorter side should screw into the block where the knurling locks/stops the nipple, keeping the nipple from comming back out when the filter is unscrewed.
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post #13 of 35 Old 05-10-2020, 01:50 PM
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Quote:
Originally Posted by jeepdaddy2000 View Post
Somebody was definitely in there and gutted the bypass valve. The threaded end looks like a pipe adapter for a hot water heater........

That's exactly what it looks like and probably the reason why the oil filter did not fit in the first place.

If I remember, the threads are suppose to be 13/16-20 as I looked into that while cross referencing oil filters 10 years ago but don't know for sure. It looks as though PO tapped it out to 3/4-10 pipe threads.
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post #14 of 35 Old 05-10-2020, 03:29 PM
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Quote:
Originally Posted by keith460 View Post
That's exactly what it looks like and probably the reason why the oil filter did not fit in the first place.

If I remember, the threads are suppose to be 13/16-20 as I looked into that while cross referencing oil filters 10 years ago but don't know for sure. It looks as though PO tapped it out to 3/4-10 pipe threads.
I think 3/4 NPT is 14 TPI but whatever's in there is not the correct part anyway. FWIW. Thats the worse thing about buying a used vehicle, you never know what the previous owner messed with.
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post #15 of 35 Old 05-10-2020, 07:52 PM
StoneTower
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If the threads are mucked up, he may have to have someone make a custom fitting to get it back to stock.
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