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Unread 01-27-2014, 10:49 PM   #1
4x4Sportsman
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Wj WJ First Jeep Engine Rebuild!

I am New to the site, I would visit off and on and decided to lift my 99 WJ 4.0 i bought in march of 2013 , So i really liked the looks of the meaner look of the WJ with a 2.5 lift or so . I then purchased a set of BFG Mudd Terrains 235/75 R16 and pretty much pulled her out and drove it back and forth to the mechanic while they was working on my girlfriends 2004 WJ getting ready for a trip she had to take, and it happened . The rattle from below. Oh how i hoped it was the flex plate , i listened to videos till i was hard of hearing trying to figure out what i was hearing. Well broken skirt #3 . Man i was sick about it , i really like my jeep and i was just getting her to how i wanted it! Well she is due back from the machine shop the end of this week (Rebuilt) and will be back in operation soon after.

I will be using castrol 5w 30 and lucas engine break in & a K&N Gold Premium Filter with magnets around it for the first 500 and then a clean run of 5w 30 for another 1000 miles or so and then change her again with a ZDDP additive again and through out the life of my jeep. Thanks to the EPA

Anyway i sure appreciate the insight form this site i have looked over and helped me make a few decisions .

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Unread 01-27-2014, 11:00 PM   #2
new2site
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Glad to hear you got it taken care of ....how many miles did it have when the piston skirt went out??
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Unread 01-27-2014, 11:18 PM   #3
4x4Sportsman
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It had 156,000 miles on it , I have heard anywhere from 120,000 to 175,000 is when it seems to happen. But who can say . I first priced used engines with more miles than that costing more then the rebuild!
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Unread 01-27-2014, 11:20 PM   #4
new2site
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I'm surprised.... I heard of a lot of them go until 300,000 before having it happen. I think keeping up on oil changes plays a big role.
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Unread 01-27-2014, 11:54 PM   #5
mycreativename
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Quote:
Originally Posted by new2site View Post
I'm surprised.... I heard of a lot of them go until 300,000 before having it happen. I think keeping up on oil changes plays a big role.
The early WJ 4.0's (99-00) had casting issues causing the exact same problem the OP had.
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Unread 01-28-2014, 05:18 AM   #6
99WJ539918
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Quote:
Originally Posted by 4x4Sportsman View Post
It had 156,000 miles on it , I have heard anywhere from 120,000 to 175,000 is when it seems to happen. But who can say . I first priced used engines with more miles than that costing more then the rebuild!
How much were you getting quotes for used engines? What did the rebuild cost you?
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Unread 01-28-2014, 07:32 AM   #7
4x4Sportsman
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The lowest used price for 120,000 m was $1000.00 plus shipping/// The highest priced was $2300.00 +S/H 88,000 mi // Avg price was $1200.00 S/H 176,000-223,000 mi and crate motors are $1700.00 -$2000.00 plus shipping and return the core $350-$575 up front/// core $ get it back when you send the core.

What turned me to the rebuild is the price of course. ITS NEW! and if i would have jumped and purchased the first used one i seen ,, how long would it be for the skirts bearings whatever in this one 5 miles? 50,000miles? who knows, that was the deciding factor. Why risk it . it still has to be swapped out by me or someone . i dont have the place for that so i have to have it done.

The rebuild tax out the door $1365.00 $500.00 install

Rebuild is being done by a good machine shop and a guy who knows his stuff . which came highly recommended , so i am not worried about that. which is a nice feeling. I am going to help with the install as well so i will save a few $ off the $500.00 install
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Unread 01-28-2014, 07:51 AM   #8
Jeeples
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IIRC, its been mentioned here and on the BITOG forums that the ZDDP additives/replacements aren't that great. Might look into running Rotella 10W-30 or 5W-40 synthetic instead.
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Unread 01-28-2014, 08:06 AM   #9
4x4Sportsman
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Quote:
Originally Posted by Jeeples View Post
IIRC, its been mentioned here and on the BITOG forums that the ZDDP additives/replacements aren't that great. Might look into running Rotella 10W-30 or 5W-40 synthetic instead.

I will have to do that , I have been reading/watching trying to decide that very thing , what to use. I really am on the fence still LOL , Thanks for the info on where to look and read up on this. The reason i did settle in on the this at first was the bounding property of conventional oil was the bounding properties it has to metal , which synthetic does not , synthetic is a better lube ball bearings etc. but doesnt stick to cams etc. as well. I dont know what to do really lol The Rotella i did plan to look at as well. Thanks for the Tip I will check it out.
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Unread 01-31-2014, 08:36 PM   #10
grussell
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When are you putting the new motor in? I pick my parts up from he machine shop net Friday and will put my engine back together next weekend. Block bored, reman crank, cam checked, new pistons and rings, new lifters, rods checked, head is done and I have cleaned and painted everything. Man was the intake gunky. it took me about 2 hours to clean that thing out. I am installing the motor in my garage. I just hope it warms up some by then. We have been getting blasted with snow this year.

Think these pistons have been up and down a few times?
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Unread 02-01-2014, 12:12 AM   #11
Krooser
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I'll be repairing my 4.0 next week… same nasty engine rattle.
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Unread 02-01-2014, 09:07 PM   #12
4x4Sportsman
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i am picking it up tuesday or thursday , he said she would be ready to go, I cant wait to get it back on the road
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Unread 02-01-2014, 09:09 PM   #13
4x4Sportsman
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I hoped for flex plate but no dice, I am putting a new one in as well do to the common problem there like the piston skirts.
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