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ohiohatteras

ohiohatteras

Well-known member
Joined
Apr 20, 2005
Messages
447
Status
  1. OWNER - I own a Hatteras Yacht
Hatteras Model
36' CONVERTIBLE-Series I (1969 -1977)
Back in the day we repowered our 34 with 3160 cats. The 36 was out at the time and we were able to copy what Hatt did on it. We took out the 290 Chryslers and sold them and the gears. The whole project in 1972 $ was $13k the 34 is a lot lighter than the 36 and we could run circles around them. The difference in range performance and safety was impressive. Of course Diesel was .17c back then and gas was .34. Our mission back then was fishing 70nm offshore in the NE canyons. The conversion also let me develop a semi profitable charter finishing business. Unless you use the boat a lot or are one of us that the boat is more than just a bunch of plastic and metal it might not be feasible. The naysayers will now way in!
BTW a friend of mine Tommy Eccle did a few yanmar repowers on 34s back in the 90s
 
A friend repowered a 31' Bert years back with 4cyl. Yanmars. Ran good, economical, cruised about 19kts. Also, a Yanmar service dealer told me they are maintenance intensive with expensive parts.
 
These Yanmars aren't powerful enough, and the parts for servicing are expensive. The only remans to put in these boats are Cummins B series one, FROM CUMMINS, which are reasonably priced and fit and work beautifully. If you want to do it, those are the engines to do it with.
 
If money is the only deciding factor the diesels won't make sense. The re-power will cost more than replacing or rebuilding the gas engines. Are you adding in the cost of a new generator? The engines you posted may be good but unless you know who rebuilt them and how they stand behind them, it's hard to say if they're a good deal. Cost for those engines will be over 40K when done. If you read the add you'll see you need to add a 7K core charge and buy gears. I have no idea what gears for those engines would cost but my Twin Disc 5111A retailed for about 11K back in '02. Your tanks are set up for diesel so that will be an easy upgrade. What size shafts do you have? If they are smaller than the diesel powered 36C you may need bigger shafts. A high RPM engine wouldn't need as large of a shaft as a slow turning one so those Yanmars may make sense. Don't forget the cost of new props either. They are pretty pricey even if you can find the right set of reconditioned used ones. Add it all up and compare the cost. Only you can determine if it's worth the extra cash. Try and talk to others that have done it and see what the pros and cons are.
 
Not sure what engine will fit but I did just see that Cat is selling Re-man 3116 and 3126 with full warranty. These were the troubled Mexican 350-425hp cats that had head problems if I remember right. Cat had a bunch of them returned and not sold so they engineered a fix. Cat guy told me $18K each no gears.
David
 
jim rosenthal said:
These Yanmars aren't powerful enough, and the parts for servicing are expensive. The only remans to put in these boats are Cummins B series one, FROM CUMMINS, which are reasonably priced and fit and work beautifully. If you want to do it, those are the engines to do it with.
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Why do you think they're too small? I would think 315HP would be good in that boat. He should get better cruise performance than with the gasers.
 
dastahl said:
Not sure what engine will fit but I did just see that Cat is selling Re-man 3116 and 3126 with full warranty. These were the troubled Mexican 350-425hp cats that had head problems if I remember right. Cat had a bunch of them returned and not sold so they engineered a fix. Cat guy told me $18K each no gears.
David
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ohiohatteras said:
However, after doing some research, looks like you can get remanufactured diesels for the same or less than a brand new gassers.
Click to expand...

A complete big block crusder ALL new with fuel injection is probably 10-12k each. This is probably MSRP with no rebates or deals. I'm sure you can find alternatives out there that are cheaper. These would likely drop right in.

Another option is just do a long block. That would probably be 2-3k each engine plus labor. I could be slightly low though. Nothing wrong with carburetor engines.

I don't see any purpose to switching to diesel unless you run a lot of hours a year.

http://www.crusaderengines.com/repowerspecial.html (only goes up to 6.0, but that may be a good engine for you as well)
 
rsmith said:
Back in the day we repowered our 34 with 3160 cats. The 36 was out at the time and we were able to copy what Hatt did on it. We took out the 290 Chryslers and sold them and the gears. The whole project in 1972 $ was $13k the 34 is a lot lighter than the 36 and we could run circles around them. The difference in range performance and safety was impressive. Of course Diesel was .17c back then and gas was .34. Our mission back then was fishing 70nm offshore in the NE canyons. The conversion also let me develop a semi profitable charter finishing business. Unless you use the boat a lot or are one of us that the boat is more than just a bunch of plastic and metal it might not be feasible. The naysayers will now way in!
BTW a friend of mine Tommy Eccle did a few yanmar repowers on 34s back in the 90s
Click to expand...

Tom was the muscle behind my repower, good people. I have agree with Jim on servicing the yammys, much more $$$ in the long run. Hard to beat the long proven track record of the B series Cummins, I love mine.
 
When I was looking at repowering my boat, I did look at Yanmars. The 315 hp engines were out there, but Yanmar dealers locally discouraged me- said they didn't have enough torque, they would work too hard, etc. They suggested the 350hp model. Then I found out they had d/c'ed the 315 anyway....

I would not have Cat remans, not of those engines. I owned a pair of 3116s and they stank. A close friend had 3126s in a 36C and replaced three engines. Quite a feat in a two-engine boat. One cracked block, one broken crankshaft. I think I'd rather row or convert to OBs.
 
+1 on the 3116/3126 Cats. I wouldn't accept a pair as a gift. They may be just fine now but their reputation scares off many buyers.
 
I forgot to mention the dreaded BTS, Black Transom Syndrome..... five minutes out of port and the freshly-cleaned transom is already sooted up....now I wash the transom once a season, whether it needs it or not....the Cummins engines run much cleaner. No comparison.

There is a device that opens the rack on 3116/3126 Cats as the boost comes up and supplies more air. We could never get it set to that point where the air and fuel supply were matched so that the engines didn't soot up the boat.

To be fair, a friend's old 36 convertible is still chartering out of Hatteras village with the 3126s and seems to run fine.

+2 on what Eric said- having 3116s or 3126s or 3176s seems to make a boat very difficult to sell.
 
So Ohio Hatteras, what did you decide to do about the engine repower? Did you consider the Crusader 6.0 EFI's @375 horsepower ( and only 930 lbs)?
 
Just for fun, I have to ask what the viability (or not!) would be of J&T 6-71N's (310hp vs 315hp mentioned above) or the blown versions at higher hp. Or are they too large dimensionally, etc.?
 
I'm still on the fence.......If I go gasser again, it will be Big Blocks tho.


lake of the woods said:
So Ohio Hatteras, what did you decide to do about the engine repower? Did you consider the Crusader 6.0 EFI's @375 horsepower ( and only 930 lbs)?
Click to expand...
 
I'd never put gas in a Hatteras on purpose. That goes double for gas engines.

We just finished replacing tanks on a Chris that has gas engines. Gas is not good for long term boat use.
 
Boatsb said:
I'd never put gas in a Hatteras on purpose. That goes double for gas engines.

We just finished replacing tanks on a Chris that has gas engines. Gas is not good for long term boat use.
Click to expand...


please explain. My last Chris Craft had 43 year old 327's that were still running well. A friend has a gas Hatteras with 1992 454 Mercs with 1500 hours and going strong.
My neighbor had 454 Mercs in his Bertram and removed them at 3400 hours. They mercs went into another boat and my neighbor put new Crusaders in the Bert.
I repowered a Carver in 1994 with new Crusaders. I was on the boat a while back and it has 1500 hours on it and runs as new. Still pull 4500 rpm.
 
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