N14 preventive maintenance

You have a great engine in the N-14.My last truck I had was
an N-14. Put 1.7 million miles on her with 39,500 hrs on it. I changed my oil every 12,000 miles and added a gal of Lucas every oil change.
I finally spun a bearing because my oil pump gave up. I should have changed it at the million mile marker, mistake I made.
It was a strong engine, always loaded to max. It would occasionally blow an injector but they were easy to change, did it in a parking lot in Kalamazoo one rainy morning. Changed it in a half an hr. Easy to work on. Yeah, you have a good one.

 

Keep the top end properly adjusted and replace the speed timing sensor periodically.

 

I never have used Lucas in my fuel, would always put about a cup of automatic transmission fluid in the tanks when I fueled.
Kept the tips of my injectors just like new and was great for my fuel pump, never replaced or repaired the fuel pump.

 

Yes, makes the fuel darker for sure, depends on how much you put in, sure helps er to run free.

 

Keep a timing sensor with you, and yes, the fuel check valve in the ecm cooling plate outlet is common to fail or become contaminated. Not all had the check valve though.

15k on oil change.

Buy water pump and fan belts, cause they're often hard to find on the road.

Keep an eye on oil leaks around the accessory drive, and don't let them go too long. If the seal has to be replaced, make sure they do the bushing too.

Injectors mentioned earlier. If you're going to keep the truck, go ahead and buy one. They are getting hard to find.

 

Yes there is a check valve, Main fuel line taking fuel to the injectors has a check valve, this can get small pieces of rubber caught in the check valve itself.
The check valve on my N-14 had the valve going into the block, there inexpensive. Will make your engine run smoother when you remove these object's, if you have any in there. Actually, there are professionals on here who can explain it better than I. Ex: where it is located and it's purpose and so on. Easy fix.

























;