350 small cam Cummins, can I run OTR with this?

Binderdavemays1 · Mar 5, 2025

Engine pics

ElmerFudpucker · Mar 5, 2025

https://dai.com.au/docs/855-CPL-matrix.pdf

Binderdavemays1 · Mar 5, 2025

Binderdavemays1 · Mar 5, 2025

ElmerFudpucker said: ↑

https://dai.com.au/docs/855-CPL-matrix.pdf
Click to expand...

It says notes B, D
Do you have those notes?

ElmerFudpucker · Mar 5, 2025

Binderdavemays1 said: ↑

Engine pics
Click to expand...

That indeed is a small cam.

ElmerFudpucker · Mar 5, 2025

Binderdavemays1 said: ↑

It says notes B, D
Do you have those notes?
Click to expand...

I do not.

Binderdavemays1 · Mar 5, 2025

Is it a good engine to save and rebuild
Or big cam 400 with Jake’s?

Binderdavemays1 · Mar 5, 2025

little cat 500 said: ↑

what's the plans for this truck over the road ya better know how to work on it
Click to expand...

I’m doing the rebuild myself with an old school mechanic friend
I’m mainly going to haul trucks around with a tote

Binderdavemays1 · Mar 5, 2025

SmallPackage said: ↑

Those engines were in installed in 60% of all diesel trucks from after WW2 to mid seventies and are still around running strong. They made a million or so of them. What kind of bad rap can they have?
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That’s why I’m asking
I know people have a strong dislike for BC 4’s
Just testing the waters

Binderdavemays1 · Mar 5, 2025

Inderjit said: ↑

The small cam Cummins is a good motor! They were prone to leaking head gaskets at the rear of the centre head and the front of the rear head or cylinders 5 and 6. the liners would get loose in the block at that location and leak coolant. Air would also get into the coolant and the cavitation erosion around the liner packing area would cause a hole to form in the liner and coolant would get into the oil. Machining the block to lower press fit liners would help a lot with this problem.
The 855 small cam started as the NH250 and was naturally aspirated later it was fitted with a turbo and became the NTC335, the next version was equipped with a after-cooler and became the NTC350. The next version was equipped with a higher flowing coolant pump a lower compression ratio and was the NTA400. The NTA400 did not last it had camshaft injector lobe failures and had hard starting problems when it was cool out. Notice I did not say cold. The next step in the 855 Cummins evolution was to go from a 2" cam bore to 2 1/2" cam bore which allowed a bigger injector lobe on the cam with a longer ramp.
The 350 small Cam Cummins is a good motor if you leave it at a 350. Rebuild it to a 0021 or 0160 CPL and time the cam followers at .041".
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Thank you

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