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Tractor Talk Discussion Forum

Stuck diesel injector causing crankshaft to break?

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frankiee

10-17-2006 05:59:23




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On a Detroit diesel "Series 92", will a stuck fuel injector cause a crank shaft to completely shear off? The break occurred just 2 inches back from the damper.
The engine had 25 hours use on it from an "engine rebuild".
It was at my work so I do not know all the details of what was done to the engine.
The engine drives a 150 kw generator.
When I got back to work, the generator had a failure. When we took it apart we discovered that the exciter armature had been rubbing against the stator and grounded out. We sent it away suspecting a cracked or bent shaft caused by the crank when it broke.
So my question is, has anybody heard of cranks breaking because of sticking injectors of a diesel?

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dan wc ne wyo

10-17-2006 18:03:36




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 Re: Stuck diesel injector causing crankshaft to br in reply to frankiee, 10-17-2006 05:59:23  
Hi Capt Ron, if the injector stuck, it was not able to make another stroke to inject any more fuel same as removing a spark plug wire on a gas engine. I would look at the vibration damper as already said. Also fan belt too tight, causing a bending in the c/s or c/s reground without the proper fillet radius. Was there a sharp hook at the break?If the break is at #2 main possibly too tight fan belt or other drive belt from the c/s pulley. If it is at the rear(#4) look at generator alignment to the f/w housing and possible rear engine and generator mounts, if both are used. Many generators are mounted at the generator side and f/w housingmounts and pivot on the connecting bar, using a front of the engine mount for a 3point mount. Also should check c/s deflection at the rear 2 counterweights as directed in the service manual.HTH dan wc ne wyo

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CaptRon

10-17-2006 08:52:20




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 Re: Stuck diesel injector causing crankshaft to br in reply to frankiee, 10-17-2006 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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RodInNS

10-17-2006 08:12:44




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 Re: Stuck diesel injector causing crankshaft to br in reply to frankiee, 10-17-2006 05:59:23  
Are you talking stuck injector as in the plunger was stuck, or stuck injector as in the RACK was stuck. If the rack stuck in a Detroit, it sticks all the injectors. If it was accelerating, and at max delivery.... anything could happen. Lots of those things ran away like that. Dunno if that's why the crank broke here or not. I think the harmonic balancer idea makes more sense really.

Rod



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oldcraneguy

10-17-2006 07:37:53




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 Re: Stuck diesel injector causing crankshaft to br in reply to frankiee, 10-17-2006 05:59:23  
Im not real familar with 92's but if theyre like a 53/71 I dont see how a stuck injector would cause a crank to break, once the rocker pushes the plunger down and it sticks I wouldnt think it would squirt any fuel after the intial shot hence youd get a dead miss on that cylinder not the greatest harmonics I guess, but break the crank? I kinda doubt it... but I been wrong before just ask my wife.

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jmixigo

10-17-2006 06:44:22




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 Re: Stuck diesel injector causing crankshaft to br in reply to frankiee, 10-17-2006 05:59:23  
I've heard of it, but have never seen it. Because of where this one broke I don't think that was your problem. When a crank fails at or near the very front (especially on a "fresh rebuild") it it usually because the damper was not properly installed. Some times there is a problem in the accesory drive also. Often when engines are rebuilt the crank used won't be the same one that came out of the engine cause the original was offered as a core for a "kit". Often stationary engines like are used in generators have bit different balance factor than a truck engine, and so use a different damper. Those "Silver 92" series Detroits don't have the world's best reputation for reliability in trucks but make great pump and generator units.
At least it ain't yore money down the tube.

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Bob/Ont

10-17-2006 08:32:17




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 Re: Stuck diesel injector causing crankshaft to br in reply to jmixigo, 10-17-2006 06:44:22  
If one injector's rack sticks they used to run away and blow up. About 30 yrs ago they installed spring loaded fuel control shafts so the rest could come back to low fuel and not have a runaway. The stuck one however would over fuel and that cyl hit hard. That would make vibration and vibration will make things crack.
Later Bob



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