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Yes I basically agree with everything you’ve said all along. I don’t have 20 or 30 years to live for that matter LOL I am 62. Would be nice to believe that. If I could get 10 years out of this ship I would be pretty happy. We are not chartering fishing partys or anything like that. Simply a...

The pump system on this motor is a low pressure system the pressure comes from the rocker are pressing the plunger in the injector. I am simply trying to find a fuel leak around the O-rings. Don’t know how much fuel pressure it would take to achieve that. But I wouldn’t think much.

You know I hadn’t thought of that, really good idea. These motors were said to have been rebuilt a few years ago and then never really used as the owner fell sick and eventually passed away. The boat sat here in the harbor for a good four years maybe longer before we bought it. I would imagine...

I am starting this job Monday morning going to remove the injectors first. I feel that the O-rings will probably tell me everything I need to know. The information you sent me is golden and I really really appreciate it. As I said I have been a mechanic for more than 40 years but diesels have...

Yes at this point I am going to send the injectors and the PT pump out and have them rebuilt I do not know enough about them to do it myself. Not like rebuilding and Edelbrock carburetor or something LOL also I think it would be impossible to detect a fuel leak from the injector without some...

I received the manual but was disappointed when it did not cover the breakdown of the injector pump and injectors for that matter. But I have read a lot of it thus far. The rocker arms and rails and inside the heads look super clean. This could be from leaky injectors also or just that the...

Yes It really does I am understanding more and more about the system from this form. I finally received a repair manual but it did not cover the injector pump or injector is very disappointing on that. At this point I think I am going to start by just simply removing these injectors and having...

Yes I completely understand that I have never witnessed it but there is nothing good about a runaway motor :(

Thankyou so much I really Appreciate your help in this situation.

OK so what you’re saying is if there isn’t a cracked diaphragm in the fuel pump in the injector pump that could allow fuel to get into the crank case then it could possibly be O-rings on the injectors and they would allow fuel to get into the crank case via what? Passed my Pistons or is there...

No such animal on this 903 V8. If there is a fuel pump and diaphragm it is going to have to be in the injector unit somewhere. Tracing the fuel line going into the injector pump goes to a filter from there the line goes right to the fuel tank. No in between ‘s.

Thankyou all good ideas�� I am looking it over now . The rocker arm assembly’s are super clean and no sign of Diesel coming up and into the head from around the injector. This is not like working on a small block Ford or Chevy LOL there is not a conventional fuel pump mounted to...

Although I have been a gasoline mechanic most of my life I have worked on some diesels from time to time and I drive a turbo charged four-cylinder diesel truck. I have restored many boats this is the largest one I have owned I lived on a 35 foot sailboat that had a Yanmar three cylinder diesel...

Sorry about the voice dictation

I am not familiar with the 3208. The fuel lights coming off of the injector pump go into a y One goes into a fitting is the front of the head and the other does the same on the other side. Best I can tell is that there is a port running through the head feeding the injectors. In other words...

That is exactly how I feel too. It is a V-8 so there are eight injectors. But as I said before I have been a mechanic my whole life just not working on diesel motors. I ordered a repair manual but it has not arrived yet. My original thought when I was told that it probably has a cracked injector...

As I said previously I am a long-time mechanic but not a diesel mechanic. But I do understand the fundamentals of a motor. I understand the injector pump and what it does for the diesel motor. I understand the injectors and what they do. Without proper fuel pressure to the injectors the motor...

Thank you very much for replying. I have been a mechanic for 40+ years but not on diesels. I have been told I probably have a injector issue. But I like your idea with this fuel diaphragm. I have a hard time believing that that much fuel from a injector is getting past my piston. Your answer...

Thank you for getting back to me. The fact of the matter is these motors have not run for a long time but are what appears to be very good shape. I bought the boat a year ago and I am now firing the motors for the first time. I have been a mechanic for 40 years but not a diesel mechanic. The...

Newbie from Monterey Bay, CA. I own a 1973 Uniflite 47ft power boat with 2 Cummins 903 v8 engines. I'm getting diesel fuel in my port side motor oil. Has anyone run into this problem or know what the issue might be? Greatly appreciate any input.

Hello all! A friend suggested this forum. Looking forward to collaborating and getting insights from seasoned boaters. My wife and I own a 1973 Uniflite double cabin 47 ft power boat in Monterey Bay, CA. Thank you, Eric