Cummins NTC 350 Help

[DMiller]

Basic PT Injectors.

 

[Truck Shop]

Standard injector for small cam, What you called brass are actually called coppers and seal out the coolant jacket. There is a special cone shaped brush for cleaning the coppers.

But I'm going to step back and let others finish this thread. Good luck.

 

[Junkyard]

Standard injector for small cam, What you called brass are actually called coppers and seal out the coolant jacket. There is a special cone shaped brush for cleaning the coppers.

But I'm going to step back and let others finish this thread. Good luck.

Better stay....you’re the resident expert sir.

 

[DMiller]

I agree, I just throw down what I can remember as my biggest headaches.

 

[kshansen]

View attachment 208541

Yep just plain old PT injectors none of that new fangled top-stop stuff! Am I showing my age here or what?

To be totally honest spent many years working on small cam and other Cummins engines but only ever touched one that had top stops! Company got away from doing our own engine work and also leaned much heavier towards Kittiy Cat for most off-road equipment right around the time Cummins came out with the top stops.

Also we used the dial indicator method for setting injectors, seemed to have better luck than the torque method.

One point on those push tubes. If you find them full of oil, would expect more than a couple, be careful what you do with the junk ones. At a Cummins factory class I went to many moons ago was told that a guy had decided that tubing would be handy for some homemade tool. Not sure if he used a chop saw or cutting torch but which ever when he was cutting off one end the oil inside flashed and he got burned real bad.

So if you decide to cut one use a hand powered hack saw for the first cut then wash out!

 

[kshansen]

I agree, I just throw down what I can remember as my biggest headaches.

Same here, been so many years since I really worked on a small cam or any Cummins I forget how big a hammer to drive those injectors in with!

 

[Junkyard]

Made many a center punch with the pushrod off a Cummins injector.

 

[kshansen]

Made many a center punch with the pushrod off a Cummins injector.

I'm thinking you mean the plunger out of the injector? Or would that be the short rod from rocker arm to the plunger?
Just might want to wear eye protection when hitting them believe they are pretty hard steel!

 

[Junkyard]

I typed plunger. Didn’t proof read it, evidently my phone liked pushrod better. I’ve actually never had an issue with one making shrapnel.

 

[Vetech63]

I still have all the complicated timing tools for those engines. I can’t even remember the last time I even got them out!

 

[Junkyard]

I still have all the complicated timing tools for those engines. I can’t even remember the last time I even got them out!

I’ve got em too

 

[Truck Shop]

Better stay....you’re the resident expert sir.

Thanks Junkyard-But it looks like I'm going to be free spooling some cable here soon, just waiting on the phone to ring with{You ready -trucks 434 and 438 stuck at Walmart Hermiston
but first stop at the last exit west bound off ramp in Pendleton truck 460 is in trouble on curve}. It's that time and snowing hard, so if he has a question you guys answer it.

 

[kshansen]

I still have all the complicated timing tools for those engines. I can’t even remember the last time I even got them out!

What was always fun was if you had to replace cams or timing gears in a 1710. Used the same tools with the exception that you had to do it twice and if it was off you had to figure out how much it was off and which direction then pull cam and press off the gear(s) and remove the original cam key and then determine which way the new offset key had to face. Then heat the gear up and reinstall it and hope you got it right the first time. Then repeat on the other bank!

At least the KT1150/19 engines we had only had one cam. Never worked on a V engine KT.

 

[DMiller]

Always had the old welding mitts in the box for a gear install, even then was a race to get it on before cooled too far or burnt the crap out of my hands, Three Guys!!!! One held cam, I grabbed gear, other swung Dead Blow onto Wood block or a PAR-X socket to set the gear.

Wrecker work is NEVER Done, sucks to be you tonight in the slick with the idjits.

 

[Junkyard]

Thanks Junkyard-But it looks like I'm going to be free spooling some cable here soon, just waiting on the phone to ring with{You ready -trucks 434 and 438 stuck at Walmart Hermiston
but first stop at the last exit west bound off ramp in Pendleton truck 460 is in trouble on curve}. It's that time and snowing hard, so if he has a question you guys answer it.

Holy buckets. Busy man! Be safe.

 

[BrianS11388]

Ok everyone, first and foremost thanks for all the helpful tips and knowledge. Its greatly appreciated and needed. I'll get the brush to clean the coppers. I pulled the head off #1 and #2. Found lots of coolant ontop of piston #2. I ordered Injectors today as well as push tubes. What could be causing the coolant on the pistons? I'm assuming there may be more than one with this issue..

 

[BrianS11388]

Cylinder #1 cylinder #2

 

[BrianS11388]

Thermostat housing.... definently some sealing issues somewhere...

 

[petepilot]

So those are conventional?

yes not top stops

 

[petepilot]

time for a set of recon heads and lots of very close inspection