renzo1234567 Posted January 2, 2021 Share Posted January 2, 2021 Hello, I have a 1990 Jeep Comanche with a 2.1 renault diesel engine and manual transmission. I am located in northern Italy and wanted to swap out my current engine for a Cummins diesel one. My question is, Is this possible? If so what specific cummins engine fits best and what all do I need in terms of parts to be able to pull this off. Thank you Link to comment Share on other sites More sharing options...
MiNi Beast Posted January 2, 2021 Share Posted January 2, 2021 i think the weight may be an issue. perhaps using a 4bt maybe best option. and pics? welcome to the club eh. Link to comment Share on other sites More sharing options...
Pete M Posted January 2, 2021 Share Posted January 2, 2021 there are a few different diesel engine swaps in here: https://comancheclub.com/forum/41-mj-hardcore-tech-epic-journeys-to-greatness/ Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 2, 2021 Share Posted January 2, 2021 Wait hold the phone. A 90 MJ with a 2.1L Renault TD? Anyone here know if Chrysler kept selling the engine across the pond? I know the catalog shows the TD up until 90 but Chrysler just kept the catalog the same for all 84-90 XJs and 86-90MJs. Link to comment Share on other sites More sharing options...
SoCalManche Posted January 2, 2021 Share Posted January 2, 2021 I'd say your best bet is the Cummins R2.8. I always wanted to do the 4BT swap in my TJ, but I believe the R2.8 is quite a bit lighter? Some people go wild for the 6BT. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted January 2, 2021 Share Posted January 2, 2021 2 hours ago, renzo1234567 said: Hello, I have a 1990 Jeep Comanche with a 2.1 renault diesel engine and manual transmission. I am located in northern Italy and wanted to swap out my current engine for a Cummins diesel one. My question is, Is this possible? If so what specific cummins engine fits best and what all do I need in terms of parts to be able to pull this off. Thank you The 2.1 Renault uses an AX5 manual transmission. It will NOT hold up to a bigger engine. You will need to do a conversion to an AX15 or NV3550 from behind a late model 4.0 with an Advanced Adapter transmission mount kit. Again it will NOT hold up. Period. I put a buick 3800 in my 86 in front of the AX5 that was in it. Admittedly I was a lead foot, but even when I calmed down a bit and started driving like a reasonable person, I ended up getting 1500 miles out of the transmissions tops before they'd launch the front counter-shaft bearing. In your neck of the woods, the best bet will be to purchase a jeep cherokee KJ with a 2.5 or 2.8 VM engine and manual transmission. Get the engine mounts from a 97+ XJ diesel and then mount the KJ engine in it. I'd go for the 2.8 turbo diesel and take it from there. Link to comment Share on other sites More sharing options...
Torq_Shep Posted January 2, 2021 Share Posted January 2, 2021 1 hour ago, SoCalManche said: I'd say your best bet is the Cummins R2.8. I always wanted to do the 4BT swap in my TJ, but I believe the R2.8 is quite a bit lighter? Some people go wild for the 6BT. I second the R2.8. However, I am not sure what Italy's emissions laws are. The 2.8 was never a factory installed engine in anything and is only regulated to 1999 US EPA standards on repower. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted January 2, 2021 Share Posted January 2, 2021 1 hour ago, eaglescout526 said: Wait hold the phone. A 90 MJ with a 2.1L Renault TD? Anyone here know if Chrysler kept selling the engine across the pond? I know the catalog shows the TD up until 90 but Chrysler just kept the catalog the same for all 84-90 XJs and 86-90MJs. Export 2.1 renault through the entire production of MJ, and through 94 to 96 in XJ before picking the 2.5 VM up in 97 Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 2, 2021 Share Posted January 2, 2021 35 minutes ago, JeepcoMJ said: Export 2.1 renault through the entire production of MJ, and through 94 to 96 in XJ before picking the 2.5 VM up in 97 I had a feeling about this but never knew if they did. I did know about the 2.5L TD. Link to comment Share on other sites More sharing options...
Sir Sam Posted January 2, 2021 Share Posted January 2, 2021 41 minutes ago, JeepcoMJ said: In your neck of the woods, the best bet will be to purchase a jeep cherokee KJ with a 2.5 or 2.8 VM engine and manual transmission. Get the engine mounts from a 97+ XJ diesel and then mount the KJ engine in it. I'd go for the 2.8 turbo diesel and take it from there. XJ Diesel engine mounts WILL NOT allow you to bolt in a KJ Diesel engine. Link to comment Share on other sites More sharing options...
Sir Sam Posted January 2, 2021 Share Posted January 2, 2021 44 minutes ago, JeepcoMJ said: Export 2.1 renault through the entire production of MJ, and through 94 to 96 in XJ before picking the 2.5 VM up in 97 VM 2.5 came along in 94 or 95, and got a revision in 97. The KJ VM 2.5 shares nothing with the XJ VM 2.5. Completely different design. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted January 3, 2021 Share Posted January 3, 2021 Being a European Jeep, I would search for a MB OM617 setup. Easier to get parts for. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted January 3, 2021 Share Posted January 3, 2021 Or a drivetrain and wiring swap from a late model Euro spec XJ with the 2.5 diesel option. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 4, 2021 Share Posted January 4, 2021 Nothing is gonna be the least bit easy.............. Link to comment Share on other sites More sharing options...
89 MJ Posted January 5, 2021 Share Posted January 5, 2021 Anything is possible with enough time and money. What purpose is the truck going to serve for you? Link to comment Share on other sites More sharing options...
MercManche Posted January 16, 2021 Share Posted January 16, 2021 On 1/2/2021 at 10:35 AM, renzo1234567 said: Hello, I have a 1990 Jeep Comanche with a 2.1 renault diesel engine and manual transmission. I am located in northern Italy and wanted to swap out my current engine for a Cummins diesel one. My question is, Is this possible? If so what specific cummins engine fits best and what all do I need in terms of parts to be able to pull this off. Thank you Why not do a 606 or TDI swap? You have the 90s Jeep Cherokees with the VM 2.5 why not just swap that entire drivetrain over? They are very good engines as well and should bolt in relatively easily. Link to comment Share on other sites More sharing options...
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