bhawkin2 Posted March 2, 2006 Share Posted March 2, 2006 I have a 86 Comanche 2.5L auto 4x4. I went to go to the store the other day, an on the way home my oil preasure droped to 0 psi. So I shut it off an had a buddy drag me home with a Chain. I pulled the oil pan off an there was about a 1.5 inch pile of sludge in the bottom. I pulled 1 main bearing an 1 rod bearing. The main looked ok but the top rod bearing was down to the brass looking material. The rod bearings are standard, but the main bearing is .001 undersize. I have called every parts an engine supplier I know of an no one has a .001 undersize. Has any one here ever seen this before? Should I just get a standard main set an plastigauge it an make sure my clearance is ok, or do I pull the engine an crank an have the crank turned 10.10? I live in a apartment complex with no garage, so the easiest way the better. Thanks for any info you guys can give me. Link to comment Share on other sites More sharing options...
Eagle Posted March 2, 2006 Share Posted March 2, 2006 There should be a letter code on the passenger side of the block, near the distributor, that will confirm the bearing size. The factory did use bearings that were .001 under, and as far as I know the dealer is the only source for them. On an old engine you could probably get away with running standard bearings. Gotta be tighter than the ones that were all worn away. Link to comment Share on other sites More sharing options...
Pete M Posted March 2, 2006 Share Posted March 2, 2006 I had a sudden drop to 0psi that turned out to be a failed Fram oil filter. Jeep on! --Pete Link to comment Share on other sites More sharing options...
pingpong Posted March 2, 2006 Share Posted March 2, 2006 Just swap in a nex crank kit for the motor. while you are at it, you might as well do the rings and oil pump. Patrick Link to comment Share on other sites More sharing options...
bhawkin2 Posted March 2, 2006 Author Share Posted March 2, 2006 Petermontie the oil preassure drop I'm sure was due to all the sludge, changed the filter an oil when I got the truck about a week prior to the preassure drop. Ping pong the engine is still in the truck I don't think I can get the crank out unless i pull the engine which I can't do where I live. Eagle I can see the numbers your refering to but will a jeep dealer have AMC parts? I'm going to try an put the standard bearings in tomarrow night, plastigauge it an see what the clearance is. Thanks for the info an advice guys I'll let you know how it turns out. Link to comment Share on other sites More sharing options...
Eagle Posted March 2, 2006 Share Posted March 2, 2006 The 2.5L engine was used in the XJ up through 2000, in the Wrangler through 2003 or 2004, and in the Dakota pickups. Any Chrysler, Dodge or Jeep dealer can order you the bearings. Link to comment Share on other sites More sharing options...
bhawkin2 Posted March 3, 2006 Author Share Posted March 3, 2006 Oh cool. I didn't know if it was the same engine used. I thought the newer engines were Diamler Chrysler. An the old ones were AMC. I'll give the local Jeep Dealer a call tomarrow an see if they can get the bearings. I'll try the standard one's I got first though. This is my 1st jeep with a 4 popper. The last jeep I had was the 2.8L Piece of Crap. I'd like 4.0 swap this one but the funds an lack of a garage won't allow me to at this time. Thanks for all your help. :D Link to comment Share on other sites More sharing options...
Pete M Posted March 4, 2006 Share Posted March 4, 2006 changed the filter an oil when I got the truck about a week prior to the preassure drop. Mine was fine for like 3 days and then the pressure just dropped off the gauge while on my way to a wheeling trip. It would partially come back if I revved the engine, so if yours doesn't show anything at all, then it might not be that. I mention this because a filter is real cheap and I changed a whole lot of things before I learned it might be the filter. Jeep on! --Pete Link to comment Share on other sites More sharing options...
bhawkin2 Posted March 4, 2006 Author Share Posted March 4, 2006 I'm going to change the filter an oil after I get the bearings back in tomorrow. I'll check the old filter see if I can see anything. My oil preasure dropped to 0 an I shut it off, I started it about an hour after it happened when I had the manual gauge hooked up to make sure it wasn't a bad sending unit or factory gauge. It had about 30psi for about 30 seconds an dropped to 0 reved it up once an the preasure stayed at 0. I'll definatey keep you guys posted. Thank you for the advice, i'm all ears an try anything once or twice. Pending it doesn't hurt to bad the first try. :lol: Link to comment Share on other sites More sharing options...
bhawkin2 Posted March 5, 2006 Author Share Posted March 5, 2006 Alright guys here's what I did. I installed New Rods an Main bearings, oil pump an oil pan gasket. I unplugged the coil an fuel pump, cranked the engine until I got about 60 psi of oil preassure. Hooked the coil an fuel pump back up an started it up. I now have 60 psi at a idle an it goes up around 75 psi when i rev the engine up. No knocks, banging, Clanging. Purring like a kitten an quiet as a mouse. Thanks for all the help an advice guys. Link to comment Share on other sites More sharing options...
Eagle Posted March 6, 2006 Share Posted March 6, 2006 Sounds great. Are those pressures just after a cold start, or after the engine is fully warmed up? Link to comment Share on other sites More sharing options...
bhawkin2 Posted March 7, 2006 Author Share Posted March 7, 2006 After a cold start. Once it warms up at a idle is 30 psi an about 60 psi at 60 mph. Its running pretty good so far. give me a week an I'll break something else I'm sure. :-D Link to comment Share on other sites More sharing options...
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