whiskey357
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so when you get a chance to do it again in a year be sure to post some pics....looking good so far .....this one is a long story hehehe
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Swapping a Cummins 290 into a M939 series truck
- Thread starter Vintage iron
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Vintage iron
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Just finished putting the Turbo Big Cam Cummins 290. In my M936 Wrecker. My good buddy Martin Cox was selling his wrecker and I couldn't let it pass. I took the 250 Cummins out of the wrecker and put it in my old M923 that Capecoastie now owns. This is a very difficult swap, I would not recommend it for the average mechanic. I have about 250 hours into the swap.
Made a new front motor support mount, relocated the oil filter, made new 5" intake, new 5" exhaust, new expansion tank mount, new power steering setup, 1 3/8 body lift, new fan mount bracket, new dual fuel lines, rebuilt the the wrecker injection pump and had to make a ton of new hoses and lines.
Made a new front motor support mount, relocated the oil filter, made new 5" intake, new 5" exhaust, new expansion tank mount, new power steering setup, 1 3/8 body lift, new fan mount bracket, new dual fuel lines, rebuilt the the wrecker injection pump and had to make a ton of new hoses and lines.
162tcat
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The easy method is to just swap the turbo parts over and do the dual fuel mod. I run mine at 335 spec and tow heavy with no issues. So how does the wrecker pull now with big cam power? Are you going to turn it up more?
Vintage iron
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The benifits are worth the work. The motor is pushing 350 HP and 1150 Ft lbs of torque. Plus it has piston squirter, huge oil cooler and Jacobs brakes.
162tcat
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What transmission are you running?
Vintage iron
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I am running the stock Allison 5 Speed. My Customer Steve in Ct. Has been running a 450 HP Big Cam in his M929 and runs 1600s for two years with out issue.
Vintage iron
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I want to Thank all the guys that helped me out on the swap, Martin Cox, Greg Smith, His brother in law Andrew, Glenn and his son. Also want to thank my new Mechanic Tim, it is great to have a fellow Marine working in the shop with me, Oorah and Semper Fi.
Vintage iron
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Sorry, I can't get pictures to load to SS. You will have to check them out of my FB page A&H Recon shop
Oldworldtenacity
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Is he also running it with the stock 5 speed Allison?
Vintage iron
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Yes, steve is running the stock Allison 5 spd. Too.