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Discussion Forum

MD Injector Pump Timing

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07-10-2001 20:18:03

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I just talked to the guy at Central Fuel Injection Service in Iowa and he said the occational miss I have on my MD may be due to the timing of the injector pump. I recently rebuilt my MD including the injector pump and injectors. He said timing an injector pump on the old Farmall MD's is a matter of trial and error. The question I have is, what is the best procedure to use when doing the timing. I moved the pointer one mark ahead (advanced the timing) and the missing seems to have stopped, it ran better on cold startup, and after warm. I don't know if I should try more adjustments or not as there is a little smoke when it is idling. Any advice? Roger

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07-11-2001 05:50:36

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 Re: MD Injector Pump Timing in reply to Roger, 07-10-2001 20:18:03  
Roger: I would have thought IHC would have a prescribed method of setting the timing rather than hit or miss. For trial and error method you might consider hooking up to a dino and adjust for max power at full rated PTO speed. I did the trial-error method with a perkins diesel running at full PTO RPM under heavy load as a referance. Got less black smoke and more power. Too far advance seemed to hear combustion rattle more at idle. R.

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Red Rider

07-10-2001 21:39:59

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 Re: MD Injector Pump Timing in reply to Roger, 07-10-2001 20:18:03  
On my 600 Diesel I because of normal ware I started at 0 and advanced one mark. Tried that for a while and then advanced it one more mark. It runs perfect 2 marks advanced. I tried the third mark and it did not run as well as on the second so I just moved it back to the second.

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the tractor vet

07-10-2001 21:33:08

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 Re: MD Injector Pump Timing in reply to Roger, 07-10-2001 20:18:03  
the best resultes will be at around 5 degrees before top dead center.

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07-10-2001 21:10:10

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 Re: MD Injector Pump Timing in reply to Roger, 07-10-2001 20:18:03  
Here's what the owners manual says:
'To be sure of the best timing adjustment, operate the engine with the indicator on either side of the centre mark and set it in the position giving the most efficient operation'. They also say: The correct adjustment is obtained when the engine speed is maximum for a fixed load and engine operation is smooth, with clean exhaust.'
Sounds like you have to play with it a bit to get it just right.

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