Engine failure, rebuild, with turbo, jakes.

[Iceman3005]

.
So, is the NTC-400 a bolt in replacement for the NTC-250 ?

While gathering info, I found a place called NPDDiesel.com and they sell re-manufactured power. Cummins and CAT. The NHC-250 was surprisingly reasonable compared to a "good takeout". Of course there is a range and I haven't taken the time to dig very deep.

Does anybody here have experience with these folks?

The big cam isn't excatly a drop in, but close enough for me. Especially since I want the power and reliability of the big cam. So the hassle of making it work far out weigh just rebuilding the nhc250.

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[Mullaney]

The big cam isn't excatly a drop in, but close enough for me. Especially since I want the power and reliability of the big cam. So the hassle of making it work far out weigh just rebuilding the nhc250.

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.
Upgrades are always a plus! Especially if it "almost fits" .
That gives incentive to work a little harder to make it better!

 

[simp5782]

You can reuse the nhc250 bellhousing you have to drill one of the bolts in the rear..

Front mount is not the same at all. It's easier to cut the front mount where the nhc250 mounts and weld in some steel plate for the front mount to rest on and bolt it down.

 

[WillWagner]

NTC likes to eat cams too if it is over fueled.

 

[US6x4]

Can the BC2 long block be used with the 250's oil cooler & other external accessories swapped over to minimize the amount of modifications needed?

 

[WillWagner]

IIRC, 2 different lube systems, one is FFC, full flow cooling, the other DFC, demand flow cooling. One has a stat that controls oil flow through the cooler to only flow when upwards of 230 degrees, DFC. Hard to see if the BC has that system from the pictures. Even though the BC is probably older than the SC, the better of the 2 systems is on the BC even if it is still FFC. I don't remember if the lube pump on the BC will accept the later style of pick up tube so it allows you the install a 9 gallon capacity stamped steel oil pan that is front sump for front axle clearance. If you do reuse the pan that is on the BC or or replace it with the SC pan, don't install the 6 buttress bolts, the ones that go from the pan thru to the flywheel hsg. They tend to make pans and flywheel housings crack, especially in vehicles that do frequent twisting events/off roading.

 

[Iceman3005]

If anyone wanted to know, a bigcam weighs 3200 lbs.

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[Superthermal]

If anyone wanted to know, a bigcam weighs 3200 lbs.View attachment 845593View attachment 845594

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This is the big cam 400 at 3200 lbs vs the nhc 250 at ??? lbs? Is anyone here making a motor mount kit to ease the pain? If this goes into a M813 or M923 is there some hood modifications needed?

 

[simp5782]

This is the big cam 400 at 3200 lbs vs the nhc 250 at ??? lbs? Is anyone here making a motor mount kit to ease the pain? If this goes into a M813 or M923 is there some hood modifications needed?

Big cams and small cams are a few hundred pounds of weight similar

 

[Iceman3005]

Haven't been working on this project much. Other things keep taking up my time. Got all the push tubes and exhaust cross tabs for the jake brakes. Now working on finding a good set of rocker boxes with matching jake brakes. One of my rocker boxes needs a rebuild and the set of jake brakes I got have broken tab ears.

Got the gantry crane finished. Works really well!

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[WillWagner]

Speaking of push tubes. Again, IIRC, the small cam and big cam are different lengths. Don't mix them. Again, IIRC, SC are longer. Funny how you know things and when what you know isn't used, it goes away.....

 

[SCM35A2]

Subscribed!

 

[Iceman3005]

Sorry you'll....been a crazy few years. This project has been on hold. Bought complete heads, jakes model 30E, push tubes for a big cam II 400. Going to at very minumum replace every gasket. Depending on what pistons look like when I get the heads off, may turn into an inframe. I promise this is going to get done by this summer. I want my 5 ton back on the road!

 

[WillWagner]

DO NOT put BC push tubes in a small cam, the lengths are different and things will go south quickly!

 

[simp5782]

Also be sure you center your bellhousing when you swap it from the small cam.

TikTok - Make Your Day

 

[WillWagner]

Also be sure you center your bellhousing when you swap it from the small cam.

TikTok - Make Your Day

Yes, that is VERY important too, unless you like to camp out on the side of the road!

 

[87cr250r]

You really should install dowel pins after doing this.

 

[WillWagner]

You really should install dowel pins after doing this.

You don't need to, they are installed so that if the FW hsg is removed, you don't need to dial it in again, but that is a common thing to do anyway, but it is a good idea to install them and peen the holes....think of the Dodge killer dowel.

 

[Iceman3005]

Pulling the 250 cummins this Sunday! Will get pics up.

 

[Iceman3005]

Everything unbolted, unhooked! Ready to pull!

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