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Old 01-29-2014, 04:10 PM   #1
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Oregon Jeeper needs local tech advice ASAP!!!!

Okay just had rear main seal done and still leaking fresh oil, I just got off of the phone with my mechanic and he said there may be a groove in my crank shaft causing a bad seal even on new RMS, is this true? He said basically would need a whole new engine or is there a fix for this. 1999 TJ 4.0L Auto. I am pretty devastated. I take it in to be looked at again to see if something else may be causing this.

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Old 01-29-2014, 05:41 PM   #2
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It's common for some to damage the new seal upon reinstall, especially when the seal reinstall tool is not used. If you don't have the tool, I know people have used a straw with a silt cut along the length of the straw, to help guide/slide the seal in the groove without being damaged.


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Old 01-29-2014, 06:41 PM   #3
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Yea I had RMS done last week and 2 days later poof leak again and they looked at it seemed to have fixed it and poof 3 days again leak tomorrow to take it back to mechanic. I would love to pay someone beer Pizza and Cash to help me sort this out lol.

Mechanic told me via phone that there could be a groove in the crank shaft damaging the seal but I believe that is something that should be checked and or noticed upon exposure of the cranks shaft end knowing the age of the vehicle.
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Old 01-29-2014, 06:50 PM   #4
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Island is dead on accurate! I have seen far too many professionals screw that little job up and then turn around and blame a scored crankshaft! That's why you always ask for the old parts!

That is a great video and pretty much how I have always done it (last time was my '72 El Camino's 350) except I always shot oil up over the crank with an old time oil can.
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Old 01-29-2014, 07:09 PM   #5
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Island is dead on accurate! I have seen far too many professionals screw that little job up and then turn around and blame a scored crankshaft! That's why you always ask for the old parts!

That is a great video and pretty much how I have always done it (last time was my '72 El Camino's 350) except I always shot oil up over the crank with an old time oil can.
I have decided tomorrow if he blames that on a scored crankshaft to have me look at it with him when he has it apart or I will give him my phone for a great photo op. He has to do it free because he has a guarantee on his work and I am well within the means of that.
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Old 01-29-2014, 08:06 PM   #6
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Good plan! By all means, keep us informed!

Mac
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Old 01-29-2014, 08:14 PM   #7
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Good plan! By all means, keep us informed!

Mac
I SURE WILL
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Old 01-30-2014, 07:36 PM   #8
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Was not seated properly all is good!!!!
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Old 02-02-2014, 12:27 PM   #9
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I can't get the vid to play ( flash player crap... ) But having rebuilt engines for a good number of years I know all about the Groove that wears into the Cranks....
Don't panic about a "Whole new Engine " ! You can remove the crank and have it ground smooth again at the seal surface. If it needs to be built up at this point, they will do that before grinding..
Also this can happen on the Front Crank seal, here you can go to an auto parts store and get a "Ready Sleeve" , this is a very thin stainless steel sleeve that is slipped over the pulley or wear surface and gives the seal a new surface to wear on...
Sometimes on the FRONT seals, you can "adjust" the seating depth of the seal lip so it just misses the wear groove...sometimes your lucky here, sometimes your not.
Sorry, I'm not real familiar with the Inline Jeep engine rear seals...
Main thing here is to be sure you LUBE that seal when you put it in....I like to smear grease on it and the shaft....That thin seal lip can burn up real quick on start up if it's dry... good luck, I hope your fixed.... "BH"

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