Originally Posted By: tomcat27
I've had an engine fail - and to this day I dont know the whole story - other than the main and rod bearings were excessively worn. It was a 1989 Jeep Comanche with the 4.0L engine.
Here are the facts, but I dont know the real reason for failure:
- I religiously changed the oil every 3k miles
- lots of highway miles, towed alot. mostly a snowmobile trailer and sometimes a 3000 lb boat.
- I had a Jeep tranny cooler installed
- bought the truck used with about 17k miles on it
- in 2000 the motor failed with approx 125k miles on it. I was running down the highway and it just bogged down.
- 1 week prior to the engine failure, I had the oil pan replaced by an independent shop. pan was replaced due to rust thru.
- prior to failure, the engine made no unusual noises and used no oil.
- the truck only had idoit lights, so I cannot comment on the oil pressure leading up to failure
so.... did the shop that replaced the oil pan reinstall the oil pump incorrectly?
or did the motor just wear out?
was its demised hastened by the original owner?
I am fanatical about maintenance and was floored by the failure. yes, I had the actual engine rebuilt by Accurate Engines of GR MI and I personally put another 50k+ on it before selling it to a relative who really needed a truck. but to this day I still wonder.....
Sounds like fuel or ignition...not oil. How did you diagnose that it was oil related ? I would not think replacing oil pan requires any action on pump.
I would have asked the shop to witness mid-stream teardown to examine fail modes myself, I did this on a tranny rebuild. In retrospect they showed me a sun gear starting to crumble but when I examined the pan only fine grounds..no chunks. So I paid for new sun gear. They are the experts but that just means they can fool you more easily.