tigwelditbro Posted March 16, 2019 Share Posted March 16, 2019 Looking to see what's my best option to put a new motor in. Most xjs are way past 100k or have sat for years. Is there a crate motor I can get or just rebuild mine. It run great but it is coming up on 300k Link to comment Share on other sites More sharing options...
Pete M Posted March 16, 2019 Share Posted March 16, 2019 and? we have a couple member's trucks exceeding 500k. engine blocks don't really just suddenly fail simply because they are old. typically it's a slower process of losing compression and oil pressure over the years. sudden failures are usually due to replaceable parts like seals, pumps or sensors. My 88 has hideously low compression and oil pressure and it still drives ok. (anything over 3500pms and the hp drops off and the blowby is so bad that I now have a big jug acting as a catch for the oil). what are your compression numbers? leakdown numbers? oil pressure? (checked with a mechanical gauge not the factory thingie in the dash that pretends to be one) Link to comment Share on other sites More sharing options...
Minuit Posted March 16, 2019 Share Posted March 16, 2019 300k is no big deal for a well maintained 4.0 engine. If it still runs to your satisfaction, has good compression, and makes some amount of oil pressure, run it and don't worry. Link to comment Share on other sites More sharing options...
omega_rugal Posted March 17, 2019 Share Posted March 17, 2019 rebuild it, unless theres something very wrong with it, it will work like new.... Link to comment Share on other sites More sharing options...
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