Thread: Power loss 300Tdi - found the problem

I hate to have to say this but a mate of mine has had no end of trouble with work done to his vehicle by the Romsey crew. He's now pretty much given up on trying to chase things up with them.

I'd be checking anything they did very carefully.

Originally Posted by MacMan

I hate to have to say this but a mate of mine has had no end of trouble with work done to his vehicle by the Romsey crew. He's now pretty much given up on trying to chase things up with them.

I'd be checking anything they did very carefully.

What did he get done? Just had my injector pump tweaked there which dosent really take much to do.

Has anyone else had trouble after removing the plastic stopper/ring from the diaphram from within the pump. I got a spare and now thinking to put it back in.

Yes, had this same problem with my boost compensator.
I did all the adjustments you spoke about and "no power"
Found the pin was stuck. Used a spray lubricant called "bitron".
Some "magic" formula which penetrates and lubricates.
Anyway, it fixed the problem and it has been fine ever since

Originally Posted by brianwood

Yes, had this same problem with my boost compensator.
I did all the adjustments you spoke about and "no power"
Found the pin was stuck. Used a spray lubricant called "bitron".
Some "magic" formula which penetrates and lubricates.
Anyway, it fixed the problem and it has been fine ever since

Anything special about "bitron" or can I spray some good ol wd40 onto the pin? Have you removed the plastic stopper? Do you think it really helps while itsbeen removed?

I can't remember whether I fully removed the stopper or just shaved some off it. Seem to think I might have shaved some off it.
And yes, it makes a HUGE difference.
I guess WD40 would do the trick, because that area of the pump doesn't get any lubrication from the diesel, it gets quite dry. The bitron is actually quite oily, whereas the WD40 tends to evaporate. Maybe squirt some engine oil in there too for good measure.

Originally Posted by brianwood

I can't remember whether I fully removed the stopper or just shaved some off it. Seem to think I might have shaved some off it.
And yes, it makes a HUGE difference.
I guess WD40 would do the trick, because that area of the pump doesn't get any lubrication from the diesel, it gets quite dry. The bitron is actually quite oily, whereas the WD40 tends to evaporate. Maybe squirt some engine oil in there too for good measure.

So I take it then it's safe to spray in there? Won't cause any damage to the pump?

No, no damage. Interestingly, the chamber does vent to atmosphere, so when steam cleaning engine etc, some crud may end up in here.

Found this info about the stopper that might be helpful:

"After doing some serious testing and checking I've found a way to improve the around town power that doesn't require flooring it. Under the diaphragm there is a nylon stop. It looks like a thick washer. This stops the eccentric from traveling down too far. I noticed my fuel pin wasn't traveling all the way up the taper so I wanted to see what would happen if it did. So I shaved .090" off it. WOW!!! part throttle power went way up. I checked with Northland diesel and they said it would not effect my max power settings so it should be safe and no, the pin will not travel too far. It can't by design. I'm very happy with this little adjustment."

Check out the full write up and diagram at: Turning up the pre 94 Ram diesel injector pump