As the title suggests I am assembling the parts to put a Cummins 4BT in my 98 TJ. I Have been reserved in starting a build thread just because I don't want this thread to become one which is started and then all of a sudden it just magically stops.
I look forward to sharing the information which I have learned and intend this thread to be a guide for people who also want their JEEP to roll some coal.
A little background on the Jeep first. I bought my TJ bone stock three years ago for 5K from a grandfather who was saving the Jeep for his grandson. As life would have it the grandson wanted NOTHING to do with Jeeps because they are loud, ride like log wagons and bad gas mileage. Personally I was happy the kid had a terrible opinion because I got the Jeep for a decent price.
I couldn't wait to start turning the wrenches on the Jeep which my wife named Oscar because of the forest green color and she thinks that the Jeep makes me grouchy when I work on it. The first on the to do list was a Rough Country 2.5 inch suspension lift with the 3/4 inch poly spacer, Advanced Adapters slip yoke eliminator, Tom Woods drive shaft ,stinger front bumper from TKH fab and 33x12.50x 15 BFG muddterrians on Cragar Soft 8's.
The Jeep has been pretty much this way until about the last year when I upgraded the rear Dana 35 to a Ford 8.8 limited slip and a front Dana 30 high pinion which is Aussie locked. Also re geared the axles to 4.10s. This pretty much brings the mod list to current minus small things like cab lights, and Raptor lining the tub.
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348.jpg
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348a.jpg
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348c.jpg
Approximately 5 months ago my stock 4.0 engine has been making some killer sounds. The lifters are crazy noisy ( which I know is common) I have been getting a very bad knock on the rear two cylinders. It was suggested by a couple guys at work that I was hearing piston slap. I dunno though they couldn't explain what piston slap was.. Also the engine has been running junky and honestly I was tired of chasing problems with the engine. I would get one issue fixed which led to another.
I contemplated doing a stroker and V8 and have been running through many pages of information on everything. I finally made my decision on a Cummins 4BT diesel. I will be very honest, the diesel is not the cheapest engine swap to do but for what I wanted the Jeep to be in the long run, the diesel was best choice.
I contacted Jeff Daniels Jeep (http://www.jeffdanielsjeeps.com) and spoke endlessly with Dan and Sean. Both Dan and Sean own the company and are EXTREMELY polite, personal and educated in putting Cummins in YJ's TJ's and even JK's. I was very impressed with both of their knowledge bases of the Cummins engine and Jeeps.
Dan found this engine for me.
http://i1223.photobucket.com/albums/dd506/10-3-tj/IMG00700-20120612-1708.jpg
This engine is from a bread truck and is 80,000 miles fresh from a Cummins Recon. The engine has an H1C turbo and is non-wastegated.
www.jeffdanielsjeeps.com
I look forward to sharing the information which I have learned and intend this thread to be a guide for people who also want their JEEP to roll some coal.
A little background on the Jeep first. I bought my TJ bone stock three years ago for 5K from a grandfather who was saving the Jeep for his grandson. As life would have it the grandson wanted NOTHING to do with Jeeps because they are loud, ride like log wagons and bad gas mileage. Personally I was happy the kid had a terrible opinion because I got the Jeep for a decent price.
I couldn't wait to start turning the wrenches on the Jeep which my wife named Oscar because of the forest green color and she thinks that the Jeep makes me grouchy when I work on it. The first on the to do list was a Rough Country 2.5 inch suspension lift with the 3/4 inch poly spacer, Advanced Adapters slip yoke eliminator, Tom Woods drive shaft ,stinger front bumper from TKH fab and 33x12.50x 15 BFG muddterrians on Cragar Soft 8's.
The Jeep has been pretty much this way until about the last year when I upgraded the rear Dana 35 to a Ford 8.8 limited slip and a front Dana 30 high pinion which is Aussie locked. Also re geared the axles to 4.10s. This pretty much brings the mod list to current minus small things like cab lights, and Raptor lining the tub.
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348.jpg
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348a.jpg
http://i1223.photobucket.com/albums/dd506/10-3-tj/0524121348c.jpg
Approximately 5 months ago my stock 4.0 engine has been making some killer sounds. The lifters are crazy noisy ( which I know is common) I have been getting a very bad knock on the rear two cylinders. It was suggested by a couple guys at work that I was hearing piston slap. I dunno though they couldn't explain what piston slap was.. Also the engine has been running junky and honestly I was tired of chasing problems with the engine. I would get one issue fixed which led to another.
I contemplated doing a stroker and V8 and have been running through many pages of information on everything. I finally made my decision on a Cummins 4BT diesel. I will be very honest, the diesel is not the cheapest engine swap to do but for what I wanted the Jeep to be in the long run, the diesel was best choice.
I contacted Jeff Daniels Jeep (http://www.jeffdanielsjeeps.com) and spoke endlessly with Dan and Sean. Both Dan and Sean own the company and are EXTREMELY polite, personal and educated in putting Cummins in YJ's TJ's and even JK's. I was very impressed with both of their knowledge bases of the Cummins engine and Jeeps.
Dan found this engine for me.
http://i1223.photobucket.com/albums/dd506/10-3-tj/IMG00700-20120612-1708.jpg
This engine is from a bread truck and is 80,000 miles fresh from a Cummins Recon. The engine has an H1C turbo and is non-wastegated.
www.jeffdanielsjeeps.com