Re: Don't want to start a diesel truck battle, but

Posted by stumpy on November 28, 2003 at 16:38:14 from (208.255.65.214):

In Reply to: Don't want to start a diesel truck battle, but.... posted by Tom on November 28, 2003 at 06:50:16:

Yes sir!
Fuel mileage,operating temps,power and glow plug/fuel injector life all can be shortened by improper timing! Not doubting any work that was done, but when the pump(s) were put in were they properly timed(With a tach and time)? My 93' 2500 6.2L didn't have the most hair on it's chest, but I found a few simple problems with it.
1. O.P. switch has 2 circuits, one for O.P., the other is proof circuit to turn on the electric fuel pump. Beleive it or not the injection pump will pull fuel from the tank, however a major power will be present.
2.If the injection timing is not spot on the truck will overheat,and a loss of power will result(not to mention burning off the tips off the glow plugs and injectors)
3.The older pumps were designed for sulpher in the fuel, low sulpher fuel will cause the injection pump to stick/ repsond slowly(lack of power) Add a fuel supplement with lubricating properties to your fuel now and then.
4.The viscous drive fan is a major source of aggrevation, Is the grill blocked in front of the bi-metal spring on the front of the clutch? Does it lock up when the truck is running hot? Is the radiator plugged up? Has it beeen recored or replaced with a rad with the improper fin/ tube count? The 6.2/6.5 mechanical engines used a very large radiator so all the fins and tubes are very important.
I just want to relate my dealings with 6.2/6.5's in my prior fleet, both in trucks and vans. I really miss them they are a fairly straight forward engine to work on. Most of mine had 140,000 plus when they were sold, I sorry you have had such a bad time, hope this post helps.
Stumpy

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