Re: Stuck diesel injector causing crankshaft to br

Posted by CaptRon on October 17, 2006 at 08:52:20 from (71.48.22.31):

In Reply to: Stuck diesel injector causing crankshaft to break? posted by frankiee on October 17, 2006 at 05:59:23:

Water in the fuel is usually the reason for a stuck injector along with the spray tip being blown off.
All of the stuck injectors that I have dealt with had the plunger stuck in the bore and the rack locked in position. This also locks the other injectors at what ever throttle position that the engine was operating at the time. The locked injector will not be injecting fuel in the cylinder since the rocker arm isn't depressing the plunger. The plunger will be locked in the down position and the spring doesn't have enough force to return it.
So a stuck injector is like pulling the wire off a sparkplug on a gas engine. I doubt that this would cause the crankshaft to fail. I would suspect the vibration dampner and the role of the rebuild.

Some shirt tail relatives of mine own and operate several large ocean going tugs and where having problems in the engine room of the 110' boat. They had a 6-71 driving a generator that supplied the power for a hydraulic pump which operated the towing winch. When I looked at the generator I noticed that the engine block was a different color than the other parts. They told me that they had to buy a shrot block in Brasil because the crank had broken...again. Moving around to front I could see a bare crankshaft sticking out so I ordered a vibration dampner and installed it, end of problem.
I asked how long the dampner had been gone and no one seemed to remember ever seeing one on the shaft.

As far as the relationship between the 53/71 series and the 92 series, the 92 is a big brother as is the 149 series. The number indicates the displacement of a cylinder. The number preceeding is the number of cylinders (4-53, 6-71, 8V-92, 16V-149). The V is the type of block arraingement other than inline.

CaptRon

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