How to clean Diesel 188 motor pencil style nozzle's

marlin54

Member
So I have to find out if the injector holes are all opened and not plugged on this late 60's Case 580 CK backhoe / loader D 188 motor . I Removed the injectors as it sat not running I think about 10 years in a barn or more and so looking at it I see at the top is 2 small nuts on a shaft so I removed it and tried to spray carb cleaner but nothing comes out the nozzle as is looks like its not a open passage to the tip and in both the supply line and also down inside the injector tube the manufacture has a design that is just not a open style ...Im sure it is desogned that way for a reason but you cant just look down inside it like a straw...so I have not been successful in blowing carb cleaner out the nozzle so far. At the nozzle end there is a white nylon o ring about 1/2 inch from the end and it appears that maybw the tip is screwed on and the shaft there is 2 different colors and so I want to try to unscrew it but might end up putting marks on the tube so I want to know if that nozzle screws off to clean it ? If it does not screw off then I might be trying to take something off that does not come off? So does that nozzle / end piece come off with the Plastic o-ring attached or not ? And also is the adjustment mechinism with the shaft and 2 nuts at the top something I can adjust or do I need to take it to someone wht has to do it on a bench test?
 
The purpose of an injector is to atomise the fuel, this is done by high pressure fuel from the pump lifting the needle valve off it seat allowing the fuel to exit the injector in mist form through the orifices in the nozzle, it is highly unlikely the injectors are blocked and as it takes 2500 + psi to lift the needle off the seat for the fuel to go through through them, if no fuel is been injected the most likely thing to be wrong is the metering valve is stuck in the stop position in the pump, was the stop control left pulled out while it sat, going by what you have stated I would advise you put the injectors back and have a mechanic look at it for you.
AJ
 
whoow, look at AJ. post! if anything the problem would be in the pump! what you are messing with is injection shop work.
 
Once had a 6 cyl MWM Murphy that sat up for years. Would run on 2 cylinders, only idle and do other strange things. I disconnected fuel lines at injectors, and put pump suction line in a can of laquer paint thinner. Spun engine a few revs and let set. Continued this several more times and one by one all 6 lines pumping fuel. Injector pump was just gummed up, saved a $700 trip to a shop.
 
Yep, tough to get 2000+ PSI from a rattle can...
Those rings are to be replaced any time you pull the injectors anyway, not to mention by rights the head needs special tools to clean the bores properly. Take the injectors to an injection shop or get new ones which are reasonably cheap. While at the shop, ask them how to check out your pump (give them the serial #) without ruining it & how you can fudge replacing the injectors in a dirty block.

EDIT: OMG, sucked into an old thread again...
 
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