Jeep Performance Improvement Ideas
On a rebuilt engine or if just changing the oil pump, you can do considerable damage to the engine if you try to start it without oil pressure. It takes quite a few turns to purge the air out of the system on a new pump.
Continue reading “How to prime the oil pump on a Jeep 4.0”
I picked up my new engine form R&L carriers today. I figured it would be easier to pick it up at the freight depot than deal with getting a truck backed up to my shop.
Continue reading “New 4.0 engine unloading and unboxing”My son’s 1991 Jeep cherokee had a problem where when you put it in four wheel drive, it would stay there. Since he has a 231 transfer case, this was not good on dry pavement.
To get it out of 4HI, I had to crawl under neath and pop it out with a pry bar. I could see the problem right away. The bushing at the transfer case was worn out allowing the lever to move around on the rod.
I found that Amazon had the bushing so I ordered a couple. They are kinda expensive for a small piece of plastic but not too bad.
I finally decided to pull my engine and give it a refresh. 450,000 miles.
First I set the transmission on a jack and removed the cross member.
Next I removed the drive shafts and the exhaust.
Then I lowered the transmission slightly and removed the transfer case.
Next I placed a transmission jack under the transmission and removed it from the engine.
I then removed and inspected the flex plate which I suspected was making noise. It was cracked.
Then I disconnected all the wires and the other lines. I also removed the radiator and the fan to get a bit more room. I was not able to move the ac compressor out of the way so I had to disconnect the freon lines. But I was able to remove the engine with the hood and header still in place.
I then mounted the engine on a stand. I used two of the bellhousing bolts and some threaded rod for the upper two bolts.
I then removed the valve cover. I was surprised at the lack of sludge. I guess the castrol oil did pretty good.
Next I removed the rockers and push rods.
Then I pulled the head bolts. They were very difficult to break loose.
There is quite a wear ridge on the cylinder bores. I will measure them before I decide whether to rebore or get another block.
Next I removed the oil pan. I pulled the number one rod bearing cap to inspect. The bearing looked surprisingly good for it age.
My son bought this Jeep from his high school history teacher. He and my dad repainted it and Scott restored the interior using parts from Pull a Part and from another donor Wagoneer he found.
