Engine Trouble.

[osprey]

Hi, I need some input here. Took the boat out on the weekend, 46C with DD 8V92ti engs. Cruised about four hours at 21 knots, no prob. Slept on boat. Next morning drove about two hours at 14 knots then brought the boat up to 18 knots cruised for about twenty minutes, then right hand engine lost some power. Brought the boat to a stop and sat at idle, all seemed fine. In neutral, revved right engine, all seemed fine, brought engine (while in neutral) up to 1500 rpm for about 30 seconds, all seemed fine. Put engine in fwd. gear all good, but could not throttle up, rpm only rose slightly producing lots of black smoke. the strange thing is that it is almost impossible to move the throttle forward....

Regards, Peter

 

[Pascal]

Well, first check the throttle cable is clear and that it pulls the lever all the way

Then replace the fuel filters, both primary and secondary.

 

[rmatt]

If you are getting black smoke when you throttle up you are getting fuel. Sounds like lack of air for whatever reason. Air filters or if supplied a turbo.

 

[rsmith]

Governor or rack issue

 

[workingonadream]

I would have to agree with all of the above. go with the easiest first. start with the air filters to make sure they aren't clogged. then make your way from there. im not sure what is going on with your cable, but go down to the engine room and compare the throw with the cable from the other engine. I think the cable may just be a coincidence, but I hope im wrong because that would be an easy fix. it seems like it is an air ratio issue. good luck

 

[captddis]

First check the air door and make sure it is not tripped.
The throttle cable could be in the synch or the rack or governor. Could also be that the booster spring broke. Disconnect the cable from the governor and see how hard it is to move. then work your way up.
You could have a exhaust leak causing the smoke and the heat of the exhaust melted the cable.
Take lots of pictures and a better diagnosis can be given.

 

[miker29]

I have the 8V92s with the Glendenning synchronizer - your symptoms are very similar to a problem I had that turned out to be a synchronizer cable - just a thought.

 

[osprey]

OK, it goes like this. The loss of power was very sudden so it should have been more obvious where the problem was, but due to the fact that I had only just put the floor back down, I was reluctant to pull it back up. Saying that, I wasted time checking things I was sure were not the problem. As it turns out, it was in the governor, As soon as I removed the cover, there it was, or I should say "There it wasn't" The pin which holds the governor clevis to the long control rod going to the right hand injector control tube was missing. It must have unscrew itself and fallen to the bottom of the governor housing. So far I have not been able to find it, I will use a Boroscope later today and see if I can't locate it.In the meantime I will make a new one today at work Just in case the old one is useless. It was good to change the fuel filters and re-check the setup of the throttle delay mechanism. Also it was interesting to know that a 8V92 can run perfect on 4 cylinders with no load.

Thanks for the input gentlemen, I have learned a little more.

Pete

 

[Vincentc]

Glad to hear it was not a more serious problem.
Regards

 

[Avenger]

Back in the '70s International 9.0L V-8 engines ran on four cylinders at idle. It was supposed to be a selling point during the fuel crisis. Funny thing was that to overcome friction the four cylinders had to burn twice as much fuel to keep the engine running. Sure was a great marketing gimmick though.