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CATEGORY LISTINGS > DETROIT > Big 8V92 marine engine Problems [ REFRESH ]
Thread Title:

Big 8V92 marine engine Problems


Created On Sunday April 20, 2003 12:33 Diesel Talk
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HenryD
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Joined: Apr 2003

Note Sunday April 20, 2003 12:33 View thread in raw text format
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HI

There is this Hatteras 46' hi-performance boat that I want to buy that had 8V92Ti in it with 650hp.
With wide open throttle it ran 28 kts with 3 blades nibral props and it has heavyduty transmission( I think the ratio is 1.5:1). The engines were in top condition.
Ok The current owner of the boat wanted the boat to go faster (35kts) so he sent those 2 engines to Miami and there they made some kind of a deal and they sent him 2 truck engines that were 8V92 Turbo intercooled plus aftercooled and they took the fuel modulator from the engines because they wanted the engines to get full blast of fuel all of the time. They put the engines in the boat and the first time they tried the engines on the sea one of them broke and the other one had backpreasure. He than bought 2 new engines with the same setup again (truck engines). When he tried it again, the same thing happened again. The left engine freezed ( got stuck) and the right engine has backpreasure. So now the left engine is compleetly disassembled but the guy ran out of money.
All the engines in the above story have bigger turbos and step up gear in the blowers I have been told that the mechanics fooled around with the governors too but that's not sure.

My first question is what is the difference between truck engines en marine engines?
My second question is what do you suggest that I do to make the engines back in running order?


I want to go 35 kts too if it's possible but I won't mind running 28 kts again

Thank's for your help!
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badges65
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Joined: Jul 2002

Note Sunday April 20, 2003 19:37 View thread in raw text format
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Hi,
Basically the only difference is in the Gov. marine units use a variable speed gov, with single weights havent got the manual on a V92 so not all that sure..
were the engines new or rebuilt or what.
what broke?? what caused the freeze??
did both right engines have back pressure??
are all 4 engines available??
would suggest you find a DETROIT DIESEL 2 STROKE MECHANIC and converse with him to what can be salvaged from what you have.
don

-------------------------
http://invertedvboats.741.com/
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HenryD
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Joined: Apr 2003

Note Monday April 21, 2003 11:26 View thread in raw text format
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Hi,

Thanks responding on my problem,


Uhm all the engines that they bought and put in the boat were rebuilt exept for the originals one's.
From both times one of the piston broke in the left engine and they suspect that the right was about to break both times meaning that the piston were about to break in one way of the other and they said that that was the reason for the back preasure they didn't disassemble them (the right engines).

Only the existing engines are available now.

I wanted also to know what the difference is between marine GOV and truck GOV.


thank you again.
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badges65
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Joined: Jul 2002

Note Monday April 21, 2003 17:11 View thread in raw text format
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Hi,
what broke in the piston?
would suspect that the rebuilds done were not up to scratch or the run in was not done correctly.
the main diff between gov's is the trucks have the speed control lever on the top and the marine on the side i havent got a scanner at the moment or would list a photo in my web page ..
my best advice is to get both engines out of boat and to a mechanic who knows 2 Stroke Detroits and get them rebuilt correctly and dynatested and run in before reinstalling them.
don

-------------------------
http://invertedvboats.741.com/
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busybart3
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Note Saturday July 26, 2003 15:12 View thread in raw text format
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Henry,You may want to check on something.In the twin diesel,twin screw,( I am assuming twin screw) boats that I have been around,The engines rotate in the opposite direction.I mean by this is that one engine rotates in the clockwise direction and the other in the counterclockwise direction.


I cannot tell you which go's on what side of the boat,but I have seen this many times.You may want to go back to the boats original build data and see if the original engine serial #'s are in it and check with your Detroit dealer to see if he can shed some light on this delema. Also,you can drag a lot more power from a marine diesel than a truck engine simply due to the fact that you can keep it cooler.The ocean (or lake) is one heck of a radiator when put up against a truck radiator.Power causes heat and to get any life you must be able to get rid of the heat.


Anyway,you might be farther ahead to go back to the original engines and go from there. Detroit Diesel is really good about mixing and matching parts to go fast.With all the parts that you have you should be able to build up some really good engines.Just remember,they are marine,not truck
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gato81
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Joined: Aug 2003

Note Friday August 22, 2003 11:47 View thread in raw text format
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Henry D
I want to upgrade my 8V 92 TI detroit diesel engines. I will sincerly apreciate you, for e- mailing me
the following information,related to yours engines.
Blowers speed. RATIO?
Step gears set parts numbers.
TURBOS.
Pars no..
INYECTORS
Size and parts no.

My e-mail is . cruzcol@prtc.net
THANKS ALFONSO CRUZ COLON


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