Hi All, I recently purchased a steel boat in Florida which has a '78 Mitsubishi/Samofa 4DQ50 diesel in it. I remain hopeful that I can fully rebuild this motor but there are not too many in the US - it was built in Holland. Samofa was purchased by Mitsubishi in the late 80's. I have a parts manual now but I am not able to find an operators manual written in english. These motors were sold in tractors and electric generators. Any help in downloading the operators version would be appreciated.

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Motor Service Manual 4 Dq 50 doc and Mitsubishi Motor Service Manual 4 Dq 50 epub for Mitsubishi Motor. Service Manual 4 Dq 50 read online or you can.

Jay Here is a photo of the new steel horse in her former years - she is in rough shape now. It is now being readied for a full refit. Jay, I have a boat w a Mitsubishi engine marineized by Klassen Engine Co.

You can contact them at They should have all the connections you may need to Mitsubishi to get parts and manuals pretaining to the basic engine. If the engine is recent Klassen will be able to supply you w other than Samofa marine parts (Klassen parts) to run on your engine.

The only aluminum part I have on my engine is the valve cover. The exhaust manifold on my Klassen engine is welded steel. They last a very long time and that feature is one of the reasons I chose the Klassen. Thanks for the tips. The current manual I have is written in dutch. I tried to run it through one translator and it said there was too much text.

Maybe I can find another. If you know of a good one please let me know. I happen to see that this engine does have an aluminum valve cover and manifold. It is keel cooled (one large bay under the motor is a sealed tank of cooling water) so the engine never is very close to brine if all is running well. With that in mind are the aluminum manifold and cover and?

Going to be a problem? I am going to look into Klassen right now. Try this link for Samofa manuals, including a parts list. It is a bit strange to log into - I find you have to wait the full 20 seconds as instructed before the page opens up but just be patient.

The rewards are worth it. I would love to hear of others thoughts on this diesel engine.

Good, bad, etc. I would imagine the 4DQ50 is a fine machine. It seems very simple, heavy duty and well worth the hours to restore.

I ended up with this motor after having purchased the boat that it was attached to. A surveyor called it a 'throwaway' since he had never heard the name before here in the U.S. Upon closer inspection, it appears to me to be a real jewel in the rough. Only 1100 hours on it! I look forward to this winter to pull it apart and clean it up! Samofa 4DQ50 ( Mitsubishi ) Hi Jay, Yes, I got it, and downloaded it, and have listed a few essential part numbers in my manual. You have no idea how useful this is, and thank you very much.

Like you, we just acquired this beautiful little ( 30 ft ) Dutch river/canal cruiser, a real 'little ship', and the engine came with the deal. Just for your information I am a marine engineer of over 30 years standing, and as well as major commercial ships I also was a pleasure yacht constructor ( building in Taiwan ). Thus I have quite a bit of experience, all well bought and paid for! I believe that this engine is a gem indeed, this one is running, and beautifully I might add.

I am running through various things like completely renovating the fuel system, the boat is 30 years old after all. The extraordinary thing is that, having stripped the old system down, I have no idea how it ran at all!

The amount of goop in the tanks, pipes, filters and so on should have prevented any flow at all, but not at all, it purred from the get-go. And will probably only get better with time and good, regular maintenance. So, in conclusion, I think that you have a great machine, and if you can restore it without breaking the bank ( assuming you can find one that isn't broken already!

) then you will be very satisfied. I am in the middle of Holland at the moment and all of the workshops and brokers praise this engine's reliability and longevity to the highest level. If I can help with anything just let me know, David.

Thank you so much David for your input. It is wonderful to have finally confirmed my thoughts that this will be a wonderful and reliable diesel. I am now excavating (with my son) a large area at my home to raise a used steel roof that will shelter this restoration project. I am looking at a nine year period to complete the work (all the while maintaining a healthy family lifestyle with my wife and kids).

Then I hope to sail her many, many, many miles. I know this vessel can take us anywhere. And I hope to live long enough to make that happen!

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The photo below is of the vessel shortly after her arrival here after a 1300 mile overland trip from Florida to Vermont (northeastern US). As I said above: she is a true 'jewel in the rough', yet she will one day be as lovely as the day she was first launched. I have been looking for this boat for 30 years!

I wish I lived closer so that I could climb aboard and take a closer look at many of the nice features I can see in your photo. The split forward nav windows, the roomy cabins and the anchor rode set-up and more. Would you tell me what you did prior to your first fire-up of the Samofa? I believe you mentioned you cleaned out a lot of yuck somewhere? Was that all in the fuel system? Or did you pull the head or pan? Just curious.

Nice to hear she runs like a champ. I am excited to hear ours run but that will not be for quite some time! I am jealous you are on the water. How nice it must be!

Clear, printable PDF Instant download Covers: Mitsubishi 4DQ50 2.1L Diesel Engine Pages: 141 Format: PDF File size: 31mb Compatibility: Windows/Mac/Tablet Notes: Instant download only (no printed copy). This shop manual contains the specification, construction, operation, adjustment and service procedures of the model 4DQ50 diesel engine for service mechanics engaged in servicing of the Mitsubishi diesel engines. Topics in the Mitsubishi 4DQ50 Diesel Engine Repair Shop Manual: CONSTRUCTION AND FUNCTION 1. Description 2.

Cylinder head 4. Main moving parts 5. Timing gear train 6.

Lubrication system 7. Fuel system 8. Cooling system 9. Electrical system MAINTENANCE AND ADJUSTMENT 1. Inspection and adjustment 2. Cylinder head 4.

Main moving parts 5. Timing gear train 6. Lubrication system 7. Fuel system 8. Cooling system 9. Electrical system 10. Bench tests DISASSEMBLY AND ASSEMBLY 1.

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General precautions for disassembly and assembly 2. Rocker arm shafts 3. Cylinder head 4. Timing gears 5.

Lubrication system 6. Water pump (including thermostat) 7. Flywheel and ring gear 8. Fuel filter 9.

Injection nozzles 10. Injection pump and governor 11. Main moving parts 12. Starting motor 13. Alternator 14. Preheating system MAINTENANCE STANDARDS Tightening torque Application of sealers TROUBLESHOOTING SPECIAL SERVICE TOOLS.