N14 Problems

Daniel, the N14 is notorious for injector issues. When one goes out replace them in pairs. I have two of them, once you get the bugs worked out they are great engines. Heck you can overhaul the whole thing for under $10,000. Throw in some new injectors and you have a new machine again. They just start getting all kinds of flaky things when the get over 1M but so do all of them.

I have 5 of them. great engines after you figure them out. Injectors are the biggest issue. I've tried all kinds of rebuilders and cummins remans. I would not recommend the cummins remans becouse of cost and had real bad luck with them. The best ones I've found are from interstate-mcbee. I get mine from highwayandheavyparts.com. Real easy people to work with and send a shipping label for cores.

Biggest thing is to make sure you buy clean fuel, clean that little filter on top of pump, I run a fuel filter with a water drain and keep them drained off once a week. We run howes fuel treat and/or some 2 stroke oil in fuel. Injector cups can go bad and allow water in fuel, not .good for injectors. I have a good machine shop that can cut out old one and press in new. Also had trouble with old injector harness, or the drivers in the ecm can go bad and kill an injector. And if you took it to the wrong person to turn up power and got some bad tune. That will really couse trouble.

Get an an extra injector and keep in truck. If your out on the road and one goes out, where ever you go won't have the one you need and they'll burn you on having to order one. There not hard to change done it many times on the side of road.

And like alfred said cheap to rebuild. I saw an add the other day the cummins dealer would inflame an n14 for 8999.00. If they can do it for that I should be able to do it my self for 5k.

There is no way you should have to replace all 6 again. There is another problem. O rings got messed up or were not put on right. There could be a blockage somewhere. Why do you believe they need replaced again

Don't use TA fuel with that motor. U will go through injectioners .

we dump a quart of atf in the fuel every other fuel up to help lubricate the injectors

also another thing I do with mine is run a bottle of power service year round usually every two weeks I have almost 300k on a overhaul and have never had to open it up yet just a thought motor has been in the truck for over a mil

I have an N14 and I took the radiator cap off & found a black sludge overflowing out. Any ideas where to start? Truck runs fine.

That's what I thought, hopefully that's all.

Thanks guys

well i got the truck out the shop brand new injectors its running good
i use the ATF on the fuel hope that helps
Thanks all u guys for the advice hope things go good for all u folks out there....

Daniel, I forgot to mention put a couple of bottles of rubbing alcohol in your tanks once a month. This will kill off the algea from the bio fuel, we were having problems with one of our N-14's, I had to take all the fuel lines off and clean them out, there was so much algea in them from this new fuel. I had told the operator that he needed to put in the alcohol at least once a month, he had not done so for three months and then we started having the problems. The N14 does not care for this new fuel, use the alcohol trick once a month, ATF once a month ( which one quart in each tank will disipate the dye does not even show up). You will find your fuel tanks, lines, and injectors will remain clean and lubricated. We have been doing this for quite a while after we noticed the black buildup inside out tanks. Much more cost effective than the other additives, and this one is right in the Volvo owners manual.

Oil cooler is bad. Guaranteed.

Stay away from Cummins "reman" injectors, heads, ect. Your rolling the dice if you get a good one or not . In efforts to save money their quality control went to s***. I've done that song and dance on a reman complete engine. N14 ISX all the same issues. I bought new injectors for my crate engine now it runs like a top. 3 of 6 weren't right but still passed "computer" cut out test. ISX heads are the same. Reman are 50/50 chance there not cracked . I know this by experience . ...

This time of year (with the winter blend) about once a month, sometimes more depending on the quality of fuel.

I guess if I was experiencing premature injector failures I would start looking at fuel lines, they have about a 10 year life span, after that they can start breaking down and send debris to the injectors or just getting a little air in the fuel lines is hell on injectors. As far as adding ATF, I make it in to Walmart now and then to buy gallons of 2 stroke oil. About a quart per 100 gallons I've been adding. Pretty cheap insurance for today's dry fuel and never a chance of looking like died fuel even though I've never heard of ATF turning the color of fuel.

I took a little time to think about the 2 stroke oil about 8 years ago, and I've been using it without incident since. My thoughts were that I needed an additive that would lubricate and also was intended to be mixed with fuel and be burnt in an engine. My cat sure likes his "treat" at 870k unmolested miles besides normal overhead adjustments.

I put a FASS FUEL system on, since then, knock on wood, no injector troubles what so ever. Also use good fuel filters. Fleetgaurd 1000.

I Find on my cat engine when adding a quart of 10w30 to my engine oil it makes the injectors run smoother the blowby goes away!

The best advice gorgeous n-14 problems is to get a cat a 3406 or 6nz should fix you right up

Seen that before and was tampered fuel. Fuel tank vandalized with sugar. Clean tanks. I run n14’s for years with no issues.