MiNi Beast Posted January 5, 2021 Posted January 5, 2021 all good. ive been swapping parts on mine for over 10 years now and it sat for a few years. that will never happen again. i believe neglect to be abuse. my poor baby. on the road again.
Jesse J Posted January 5, 2021 Posted January 5, 2021 yeah 400 might come quick going to moab every other weekend
jeepsouth Posted January 23, 2021 Posted January 23, 2021 (edited) I got 224,000 on mine. Owned it from 154,000. No issues with motor or ba-10 trans. Most reliable truck i've owned so far. Edited January 25, 2021 by jeepsouth
Proama Posted January 30, 2021 Posted January 30, 2021 My 91 2wd 4.0 5-speed has 280,000 runs pretty well
jeepsouth Posted January 31, 2021 Posted January 31, 2021 Nice! 2 hours ago, Proama said: My 91 2wd 4.0 5-speed has 280,000 runs pretty well
bruce9 Posted February 1, 2021 Posted February 1, 2021 On 4/14/2019 at 12:29 PM, gogmorgo said: Well 498,400km on the first 4.0 in my first MJ before I pulled it puts me in the 300+ club, by just. I also added one for the ~270,000km that are now on the engine that replaced it (240,000 of which were accumulated by the XJ it came out of). I've also got 172,000km on the other MJ's original 2.5 when it came out, but it's death was due to neglect from the previous owner. Sometimes when your crusty old radiator is leaking, the fact it quit leaking on you doesn't have much to do with the stop-leak you were pouring in the top as quickly as the coolant was coming out, and more to do with there only being a finite amount of coolant in the system... My 87 MJ - 154K, My 90 XJ 252K, My 98 XJ 335K
oleskool Posted October 4, 2021 Posted October 4, 2021 I just picked mine up and its sitting at 114k. Hoping to refurb it and make it my new DD.
XJFOX Posted October 20, 2021 Posted October 20, 2021 1988 Comanche 4.0L 4x4 Manual 44~k miles on it Greetings from Puerto Rico!
HellFighter55 Posted November 4, 2021 Posted November 4, 2021 175k on the 1986 Jeep Skamanche 4x4 with original [GM 2.8l v6 LR2] <- POS ENGINE [IMO] I hate the 2.8l v6 or it's the Varajet II Carburetor. Whatever power you thought you had is now gone at the ax5... It's perfect if you wanna do 35 mph on the main road. My 95 XJ had 390k on the engine before I bent 4 rods and flattened the cam and lifters. Currently sad that I have to rebuild the original motor. But it never blew the head gasket. So I am pretty impressed with the 4.0l H.O. engine. Guess you shouldn't pull 3/4 ton & 1 ton trucks. Now it has 390k on the Body with a built 4.6L L6/Ax15/Np231 SYE kit... and other add on's....
Clay Perrine Posted January 24, 2022 Posted January 24, 2022 I have 298000 on the original 4.0 engine. My father bought it new in 88. I drove him to the dealer to pick it up. Valve cover and pan have never been off the motor. I know it needs either a rebuild or a replacement, as I am running straight 50 weight and it still takes a few seconds for the oil pressure to come up in the morning. It has had a long hard life pulling trailers with very heavy vintage Chevys on them. Question, do I rebuild it with new bearings and rings, or do I just buy a rebuilt 4.0?
Pete M Posted January 24, 2022 Author Posted January 24, 2022 54 minutes ago, Clay Perrine said: I have 298000 on the original 4.0 engine. My father bought it new in 88. I drove him to the dealer to pick it up. Valve cover and pan have never been off the motor. I know it needs either a rebuild or a replacement, as I am running straight 50 weight and it still takes a few seconds for the oil pressure to come up in the morning. It has had a long hard life pulling trailers with very heavy vintage Chevys on them. Question, do I rebuild it with new bearings and rings, or do I just buy a rebuilt 4.0? drainback valve leaking?
lippetd Posted March 3, 2022 Posted March 3, 2022 My 1986 Comanche got a little over 90K out of the original 2.8l Chevy V6. (Threw a rod.) My replacement 3.4l has a little more than 75K on it. It is running strong, but it is time to ditch the crummy carburetor!
Mgd13 Posted April 13, 2022 Posted April 13, 2022 On 4/14/2019 at 2:33 PM, Pete M said: partly playing with the poll feature, partly looking for a graph showing how the stock engines are doing. multiple choice answering is allowed for guys owning more than one. If your trucks both have 175k, then I don't know how to accommodate that
MiNi Beast Posted April 14, 2022 Posted April 14, 2022 1 hour ago, Mgd13 said: Stock engine no combustion, water and oil mixing. What is blown head gasket? Alex, for $600 please.
gvthnks Posted April 28, 2022 Posted April 28, 2022 171k on the stock 4.0. After sitting for 11 years, I pulled the engine and head to replace a dead lifter that just wouldn't pump up as well as all of the expansion plugs.
pizzaman09 Posted May 12, 2022 Posted May 12, 2022 Purchased mine just recently, has 252k on the original engine. First owner put 237k on it in 16 years. Then it became a parts runner for the original selling Jeep dealer for 15 years getting few miles but probably beat on. Now I beat on it. 🙂
Classy Comanche Posted June 19, 2022 Posted June 19, 2022 177k original miles and growing strong. Bought on Halloween on 2020 from my grandfather because his vision is getting terrible and wanted it to go to a good home where he knew it'd be taken care of. When he does see it pull in the driveway. He always smiles. Been owned by him since '87
Otarn Posted July 13, 2022 Posted July 13, 2022 300000. Just replaced the rear main seal and pan gasket, runs perfect, used as a everyday work truck. But I’m retired and just work on a property I’m going to be building a new home.
hassyfoto Posted September 5, 2022 Posted September 5, 2022 My 91 has 153,000 original miles on the 4.0 motor.
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