guckingfuy Posted August 13, 2011 Share Posted August 13, 2011 So I dropped my oil pan and found this chunk sitting in the bottom with some metal shavings. responses on my project page say it's a piston skirt, I've looked online and no one has any how to's I'm thinking with my limited experience wrenching I'm not going to tackle this head on. (without a tonne of research) Have any of you guys taken apart a 4 banger for similiar reasons, and am I kidding myself with this seemingly complex job? Link to comment Share on other sites More sharing options...
guckingfuy Posted August 13, 2011 Author Share Posted August 13, 2011 Link to comment Share on other sites More sharing options...
shawn Posted August 13, 2011 Share Posted August 13, 2011 there's this: jeep comanche - $800 Date: 2011-07-05, 12:13PM PDT Reply to: sale-rjb2z-2478387833@craigslist.org [Errors when replying to ads?] I have a 1987 Comanche i was going to fix up replaced floor boards and is solid (common problem) Has a 4.0l inline and 5 speed red short box and comes with canopy. I also put in 2000 Mazda b4000 seats with are really comfy. I have the entire black (rare) interior in the bed of the truck as i was doing seats and floor boards. great little truck lots of potential but i ran out of time and I am getting married. I also have a NV3550 h/d trans that i was going to swap in $900. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 13, 2011 Share Posted August 13, 2011 that's a bad break. no way in hell you've got good compression, no way and hell the cylinder wall is good. motor is going to need machine work. buy a motor or get a parts vehicle. Link to comment Share on other sites More sharing options...
Incommando Posted August 14, 2011 Share Posted August 14, 2011 The only fix is to replace the piston. Depending on any potential cyl. wall damage a rebuild may be in order. If the engine was knocking or something which lead to you dropping the pan i'd say you need a replecament engine or engine rebuild most likely. Link to comment Share on other sites More sharing options...
guckingfuy Posted August 15, 2011 Author Share Posted August 15, 2011 Ok so I'm feeling like I'm going to have to buy a 4.0, mostly because the engine rebuild would cost about the same as an upgraded engine. Link to comment Share on other sites More sharing options...
tbrand Posted August 16, 2011 Share Posted August 16, 2011 If you keep an eye out, you may find an XJ that the owner rolled and is selling for parts. Swap the drivetrain, sell off some parts, and scrap the rest - if you buy it right, you may end up coming out ahead on the deal. The problem with just buying a 4.0 longblock from eBay or wherever is that you'll need a transmission too - whatever is bolted up behind your 2.5 won't last long with all the torque from the six. Usually cheaper to find a running/driving XJ than to buy separate. Link to comment Share on other sites More sharing options...
Geonovast Posted August 16, 2011 Share Posted August 16, 2011 If you keep an eye out, you may find an XJ that the owner rolled and is selling for parts. Swap the drivetrain, sell off some parts, and scrap the rest - if you buy it right, you may end up coming out ahead on the deal. The problem with just buying a 4.0 longblock from eBay or wherever is that you'll need a transmission too - whatever is bolted up behind your 2.5 won't last long with all the torque from the six. Usually cheaper to find a running/driving XJ than to buy separate. You don't have to worry about the trans not lasting long, because it won't bolt up. Besides, you need waaaay more than just the motor. The wiring, cooling, and vacuum system is different between the 4 and the 6. Along with almost everything else in the engine bay. Really, your best option is to find a good running 2.5 to just replace yours with. A 4.0 conversion is a lot of work, and a lot of time. Link to comment Share on other sites More sharing options...
guckingfuy Posted August 16, 2011 Author Share Posted August 16, 2011 If you keep an eye out, you may find an XJ that the owner rolled and is selling for parts. Swap the drivetrain, sell off some parts, and scrap the rest - if you buy it right, you may end up coming out ahead on the deal. Thats the best case scenario for sure. Besides, you need waaaay more than just the motor. a long block and the parts would be extremely time and money consuming, So I'm thinking baby the 2.5 and start up a savings account for the 4.0 (As my wallet is exceedingly flat these days) This reminds me of last year around this time a guy had a 2.5 and an ax-5 together for $250 I thought I could talk him down to $200 and ended up insulting him. :doh: Link to comment Share on other sites More sharing options...
guckingfuy Posted August 16, 2011 Author Share Posted August 16, 2011 Although if a 2.5 comes along cheap enough it would be fun to do my first engine swap with the little guy. Link to comment Share on other sites More sharing options...
guckingfuy Posted August 16, 2011 Author Share Posted August 16, 2011 What do you know?!!!! Theres a running 4.0 WITH an ax-15 for $200 They're from an 89 XJ Usedvictoria I love you Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 17, 2011 Share Posted August 17, 2011 ok. what are you going to do about the wiring? cause everything in the engine bay is different, engine computer is different, does it come with the crossmember and trans mount? how about the driveshafts? Link to comment Share on other sites More sharing options...
tbrand Posted August 17, 2011 Share Posted August 17, 2011 89 XJ could be a Peugeot tranny - they switched midyear. Be sure to double-check, if that's the route you go. Link to comment Share on other sites More sharing options...
87Chief Posted August 17, 2011 Share Posted August 17, 2011 get a 2.5 from a YJ Link to comment Share on other sites More sharing options...
guckingfuy Posted August 17, 2011 Author Share Posted August 17, 2011 I think the guy can throw in the wiring and computer. the crossmember, transmission mount, fuel pump, radiator, transfer case, driveshafts, I still have to grab at a junkyard or there are a few XJ's being parted out by fellow jeepers. (they want top dollar for engines and transmissions though so thats why I'm jumping on this usedvic ad) Link to comment Share on other sites More sharing options...
guckingfuy Posted August 17, 2011 Author Share Posted August 17, 2011 although I'm not trying to throw this engine in right this second, It would be good to know what pieces have to be swapped out and which can be saved. Is there a list of things that I can check off or a really good writeup? Link to comment Share on other sites More sharing options...
guckingfuy Posted August 17, 2011 Author Share Posted August 17, 2011 Wow just looked through MJjeffs swap thread. that was an impressive write-up :bowdown: here's a basic list of what I need If I'm missing something small or obvious let me know. Engine Transmission (and mount) Wiring harness ECU Driveshafts Gas pedal (and throttle cable) Fuel pump (and hoses) Hvac fan Heater control valve Radiator (and hoses) Transfer case mount (and linkage) Coolant reservoir gauge cluster Link to comment Share on other sites More sharing options...
mjeff87 Posted August 17, 2011 Share Posted August 17, 2011 :cheers: glad to help..... You're gonna need the frame horns and engine mounts from the 4.0 as well. The 2.5 ones look the same, but they are not. All of the bolt holes/studs are there in the framerails, just line the 4.0 ones up and bolt them in. Jeff Link to comment Share on other sites More sharing options...
guckingfuy Posted August 18, 2011 Author Share Posted August 18, 2011 You're gonna need the frame horns and engine mounts from the 4.0 as well. The 2.5 ones look the same, but they are not. All of the bolt holes/studs are there in the framerails, just line the 4.0 ones up and bolt them in. ok sounds good I'll have to get those from another xj I guesss theres another ad for three xj's with various parts. I think thats where I'll strike up a few deals. been riding around on the forum and learning lots stuff that relates to my setup. Link to comment Share on other sites More sharing options...
guckingfuy Posted August 28, 2011 Author Share Posted August 28, 2011 So here's some shots so you guys know what I'm talking about a little more clearly. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 28, 2011 Share Posted August 28, 2011 I fail to understand what valve train has to do with the piston skirt. You need to pull the head off to discover the damage Link to comment Share on other sites More sharing options...
guckingfuy Posted August 31, 2011 Author Share Posted August 31, 2011 :doh: Yeah I spaced out on that one..... I was focusing on the chips and chunks of metal missing in the photos, and assumed that was where they came from. I think I should do WAY more homework before asking so many questions. Link to comment Share on other sites More sharing options...
tbrand Posted August 31, 2011 Share Posted August 31, 2011 Are you thinking that the area around the pushrod has been losing metal? That chunk you showed in the original post looked bigger than any of those holes could have provided. Link to comment Share on other sites More sharing options...
danno Posted August 31, 2011 Share Posted August 31, 2011 I wouldn't call that missing metal, just rough casting. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 31, 2011 Share Posted August 31, 2011 I'd be more worried about the loose metal sitting in the rockers, to be honest. looks to me like that motor should be tossed. loose metal in the rockers + piston skirt in oil pan = metal running through oil passages = high chance of detonation without acid dipping the block...and even then you can't trust it. that's a complete rebuild you're looking at. it honestly doesn't matter what it looks like under the head. $#!&-can the motor, either swap another 4 banger in or do a 4.0 swap using a complete parts vehicle. Link to comment Share on other sites More sharing options...
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