Questions on oil filter adapter fix - Chevy Impala SS Forum
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post #1 of 25 (permalink) Old 09-13-2010, 03:54 PM Thread Starter
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Questions on oil filter adapter fix

I tried the search, but didnt "really" find the answers I was looking for. First question. What size are the two hex heads holding the adapter to the block? Second question. Do I have to drain the oil to do this fix? Third question. Do I have to disconnect the oil cooler lines from the adapter? If so, what size is the nut and how do I get a wrench or socket in between the two lines? It seems pretty tight in there. Fourth question. What o-ring do I use from the kit? The round or square one? Sorry for all the questions. Thanks for the help!
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post #2 of 25 (permalink) Old 09-13-2010, 04:48 PM
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Not sure what size the heads are, i didnt pay attention when i did it to a buddies car this weekend. Get a set of allen head sockets, use an extension and it will make like easy.
I would do an oil change anyways unless you just did one.
Yes i would disconnect the adapter from the lines so you can clean the gasket surfaces, get ALL of the old stuff off. Your also going to need to clean the engine block side. Prolly best to use a razor blade since its kind of tight up there.
You cant use a wrench, your going to use a 15 mm deep or shallow with a extension and ratchet. Make sure you loosen the 15 mm nut BEFORE undoing the allen heads bolts holding the adapter to the engine block

1996 Impala SS DGGM-Blueprinted and balanced 355, forged wiseco's, Level II heads, LE cam, U2-55ed, budget headers, 2500 stall, built 4L60E,CAI,PCMforLessed, Sprint springs, Walbro 255
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Originally Posted by Cracka Ass Crackuh
"Yea. You're wearing my underwear backwards. SO the hersey highway is on the front with easy access to the rear"
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post #3 of 25 (permalink) Old 09-13-2010, 04:57 PM
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Ahh yes the Oil Filter Adapter Gasket Fix, why does that sound familiar. To start off, I would recommend doing it when you need to change the oil as well, as you have to remove the oil filter, and why put the old oil filter back on, plus you are down there already and not much more work to do an oil change. You do have to disconnect the oil cooler lines, and again being a fan of not putting oil stuff back on I would change the oil cooler lines as well. You need a long reach 15mm socket with extension. For the Allen head bolts its a 1/4" hex head, most auto parts stores sell them along with Harbor Freight so you can use it with a standard 3/8" drive ratchet wrench. There also happens to be a write up for the repair on The Herd's website at Oil Filter Adapter Gasket Fix. Note the part numbers for the gasket and O-ring have been consolidated since that write up was made and the GM part number for the kit is # 88893990 and should be around $5 from your local dealer, or a little less from RMS Auto Parts but you got to pay shipping with them which unless you are ordering other parts will outweigh the extra dollar or two your local dealer charges. Also despite what I wrote 11 years ago when I did that write up you probably don't have to remove the catalytic converter I put that in as I felt removing the catalytic converter may make for more room, but doing so will probably break off some of the studs in the exhaust manifold so don't do that. Also another thing to replace while under the car is the oil level sender that's in the oil pan right above the oil drain plug it simply screws out and the new one screws in its place and is about $20-30 from your local dealer part # 12603782 . Also I don't know what square O-ring you are talking about as in the o-ring gasket kit there are exactly 2 parts an orange O-ring and a black fiber gasket. - Peter

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post #4 of 25 (permalink) Old 09-13-2010, 06:03 PM
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Everything else seems pretty much covered, except which O-ring to use. The Fel-Pro kit does come with 2 O-rings. When you take the adapter down, it will be fairly obvious. I believe all of the B-bodies use the orange rounded one. Be sure to get ALL the old gasket material out, or you'll still be leaking.

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post #5 of 25 (permalink) Old 09-14-2010, 06:53 PM
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I'm also getting ready to do this and wanted to make sure which gaskets to use. My Fleetwood has the "square" O-ring but the one in the Fel-Pro kit is almost twice as thick (same diameter) as the stock one, is it supposed to be? Also which paper gasket do i use because it doesn't have one on there now? Thanks
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post #6 of 25 (permalink) Old 09-14-2010, 07:49 PM
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You have a paper gasket, its probably stuck up in the block. Pretty certain my Fleetwood used the round gasket. It had been squished to the point of having flat spots, but the edges were still round. If yours looks different, though, you could try the other one.

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post #7 of 25 (permalink) Old 09-14-2010, 08:59 PM
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Ive always used the square bigger one out of teh felpro kit when ive done them....going on 6-7 of these and no leaks. The small circular one doesnt seem to fit very well

1996 Impala SS DGGM-Blueprinted and balanced 355, forged wiseco's, Level II heads, LE cam, U2-55ed, budget headers, 2500 stall, built 4L60E,CAI,PCMforLessed, Sprint springs, Walbro 255
1996 Impala SS DGGM (moms)-chrome stockers, flows, charcoal carpet
2006 Suzuki GSXR 750
Impala SS Owners Association of Hawaii (ISSOAH)
Originally Posted by Cracka Ass Crackuh
"Yea. You're wearing my underwear backwards. SO the hersey highway is on the front with easy access to the rear"
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post #8 of 25 (permalink) Old 09-14-2010, 09:59 PM
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post #9 of 25 (permalink) Old 04-26-2014, 07:28 AM
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Oil cooler adapter

When I pulled my engine I noticed when I took off the oil cooler adater there was no o-ring or gasket it has never been removed since the car was new and never leaked. I'm putting a new engine in. The gasket kit from gm should be used. maybe the factory guy fell asleep when assebling this car.
has anyone ever seen one without the o-ring or gasket the adapter has a groove for the o-ring.
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post #10 of 25 (permalink) Old 04-26-2014, 07:41 PM
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Did a oil change last week on my car because I wanted to flush whatever the previous owner had in it (just bought it couple weeks ago). I went to advanced auto parts they looked up the right size for my 96 and gave it to me. Once I got back to my car drained it and took my old oil filter off ( its a FRAM ) I noticed that the frams hole was bigger than the one that they gave me. I went back to the store and compared the FRAM hole to 3 other filters and they were all smaller. Is the store wrong? Is my filter too big? Or did i miss a step??

Last edited by DCMSS_Kola; 04-28-2014 at 08:17 PM.
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