Those injection nozzles were pretty crude on those M diesels. The valve in the nozzle can be taken apart and lapped to get a decent sealing surface so they don't leak and the actual spray pattern is the hole in the orfice plate which is seperate. I would doubt that they cannot be put back into service with no noticable loss of performance. They didn't go to a more precision style until the open nozzle in the 450 diesel and I cannot honestly say they ran any better . A precup engine does a really good job of breaking up that fuel once it gets good turbulence when warmed up and up to speed. I used to have a little spacer gauge to get a pretty close opening pressure setting as it is adjustable with a double lock nut on the stem of the nozzle. I think you need to get a hold of an old guy to clean and test them who is familiar with that style nozzle. None around here anymore in the diesel repair shops that is for sure. Got to have the feel for them.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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