Repowering - Cummins or Yanmar Engines

[slymeso44]

Hi Everyone,
We have a 1984 55-ft Lin Hwa Trawler; Full displacement; 78,000 LBS; that we absolutely love. Its time to re-power. The original 185 hp twin Perkins have no more life left in them, gears are equally worn out. A couple of different mechanics have looked at them, including the local Perkins dealer, and all recommended replacing as they are not even candidates for rebuilding. Given that Perkins stop making parts for its motors relatively quickly after the model is produced we are not interested in pursing Perkins motors. We are looking at equivalent 250 BHP engines from Cummins and Yanmar. For Cummins its the QSB6.7 (not sure why Cummins 4 cylinder motor is not being recommended by the boat yard) and we are exploring twin Yanmar's 4LV 250 HP motors on our own before we get back to our boat yard to have more discussions with them. Our top speed is 8Kts but usually try to stay around 4 to 6. Any thoughts on 4 cylinder motors for our size boat and Yanmar versus Cummins? Thank you in advanced.

I just rebuilt my Perkins parts and having the head plane and rebuilt was less than 3k each! They are wet sleeves that you can remove and it’s a fairly simple build! I think they are just trying to make a new engine sale and install to maximize their profits!

 

[Jeff F]

Sure. Maybe they offer remans. No need for more than 135 HP IMO and remans are allowed for repowers.

I've been curious about this, and a quick check on Deere Canada showed the full range of 4045s. Not sure of availability in the US but they should be compliant for repowers.

The TFM50 is a full mechanical injection.

 

[mydacha]

i vote for Cummins QSB6.7

 

[keith c]

I have read there are manually controlled yanmar 4 lha marine engines available. If so I would suggest that route