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Old 01-06-2023, 11:55   #1
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new injector pumps VP 2003T

i had an earlier post on identifying a original injector pump on my VP 2003T engine, with is VP PN858189 and the bosch PN 0414 070 999 i decided to buy 3 and had a question in regards to the cam follower spring clip that rides on the cam lobe. should i use the originals that are burnished on the lobes or not? does it matter? all the pumps are marked like the originals as +0.8 and i have the block without the soft shims, only hard stainless shims and rubber O ring. any special care or procedure you would recommend?
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Old 01-06-2023, 12:14   #2
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Re: new injector pumps VP 2003T

Either way would work OK but if using the new ones I would put some cam assembly lube on the surface of #12. The thickness of the washers determine the injection pump timing. Refer to the service manual for proper injection pump timing. Old school cam break-in would have you run the engine at no less than 2000 to 2500 rpm for 15 to 20 minutes so the parts wear in properly. Idling can knock the lobes off the cams if you have very heavy springs (which you do not) or a very high lift cam (which you do not) . Some manufacturers spec high zinc content oil for break in but that's typically on mechanical lifters. The injection pump is much more like a hydraulic lifter which is not as hard on cam shafts so I wouldn't be overly concerned about wear in. In other words don't worry about it. Use new or old. I'd just drop them in as they are but being old school retired master mechanic and having some in my tool box would use cam or engine assembly lube on them.
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Old 01-06-2023, 12:23   #3
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Re: new injector pumps VP 2003T

thanks, i think i'll just use the new ones as complete units. i'm getting some info on the bosch tag on injector pump, there's the bosch 10 digit number 0414 070 999 and a PFE number which on mine are PFE 1Q 75/43 but i've seen on online VP resellers with VP 2003T pump 858189, same bosch 10 digit code but the PFE is 1Q 70/36 ? would you know what that if anything designates? flow rate? plunger depth?
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Old 01-06-2023, 12:26   #4
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Re: new injector pumps VP 2003T

Not a clue. Ask a Bosch injection rebuilder. Or a Bosch engineer.
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Old 01-06-2023, 13:12   #5
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Re: new injector pumps VP 2003T

It doesn’t matter if you use the new spring retainer clips or the old clips because the retainer clip doesn’t ride on the cam shaft. The clip sits on a roller tappet and the roller tappet rides on the cam lobe. The tappet is retained in the block and indexed by a bolt which is located in the block outside and below the injection pump.

When you reinsert the pump back into the block make certain the pin on item#5 is located in the notch in the fuel control rod. Otherwise you will bend the fuel rod and bind everything up.
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Old 03-06-2023, 09:08   #6
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Re: new injector pumps VP 2003T

Just an update. I ordered 3 new Bosch pumps from Merlin diesel in the UK and also a new pump spring for the broken one on my original pump. I called Bosch tech line and got differing answers on the PFE number on the pumps. One said it didnít matter and two others said it was a sub group of the same pump and did matter in terms of how it operated, flow etc. So they came with correct PFE number 1Q 75/43 and a +4 stamped on body. From what I read on the manual this is 4mm and Iím supposed to find a corresponding stamp on block and add for shim thickness. Except I didnít find that on my block. Going to check my original pumps for this stamp and figure out either put originals back in or go with new Click image for larger version

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Old 03-06-2023, 09:54   #7
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Re: new injector pumps VP 2003T

Looking over some old (80's) Bosch Parts catalogs, the PFE number is probably an alternate inventory/parts ID number. The "UT" number is likely degrees from TDC for initial or possibly spill timing, If I recall UT is TDC in Deutschsprecht.

I doubt either number relates to how much fuel and what pressure it's delivered at. Bosch typically didn't number stuff that way, i.e. where the numbers make sense except for maybe spark plugs. I would ask a Bosch Rebuilder though. They may actually know.
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Old 04-06-2023, 15:52   #8
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new injector pumps VP 2003T

Thanks that was confusing as the picture for the pumps on Merlin Diesel had the PFE 1Q 70/36 so I thought I was getting the wrong ones. Anyway the old pumps donít have any stamped marks and neither does the block. I do have two SS shims per pump, one thicker 1mm and the other is .25mm for all 3.
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Old 13-06-2023, 07:34   #9
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Re: new injector pumps VP 2003T

well I replaced all 3 of my injectors and started her up. Bled the line and pretty much started right away. Sounds ok and no leaks so Iím happy about that. Used Merlin Diesel in UK for the Bosch pumpsClick image for larger version

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