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Old 09-04-2018, 02:48 PM   #1
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"Mack" engine in a Californian?

https://www.boattrader.com/listing/1...eti-103315396/

I see this has a Mack engine in it.... is this some sort of a backyard or shop project refit? I work on my own tractor trailers and this kind of caught my eye. Thanks.
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Old 09-04-2018, 03:34 PM   #2
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Mack had 2 different marine engines I believe. They had a good reputation for longevity but I don't think they are around anymore in marine applications. I don't know about parts support.

The original Tuna.Com (38 Duffy I believe) had a Mack in it.
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Old 09-04-2018, 03:41 PM   #3
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I see. They usta make a serious, low RPM high torque truck engine. Now everything is ECM / computer stuff. Thanks for info.
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Old 09-04-2018, 04:35 PM   #4
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Now everything is ECM / computer stuff.

Too bad.
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Old 09-04-2018, 06:34 PM   #5
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In 2000 Mack expanded into marine applications with the ME7 and ME9. The boat is a 1989, this makes it a repower. Hard to say if you got something very cool or something that is an orphan.

I am rather conservative so I would approach it like it needs new engines until proven otherwise.
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Old 09-04-2018, 07:13 PM   #6
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A few companies have marinized the Mack engines. The 7 is a 12 liter straight six, the 9 is a 16 liter V8. I ran into one V8 that had internal problems, and the pistons were no longer available. I think the compression ratio was lower on the 900hp marine. I think the guy bailed on the Mack and re-powered.

They are good engines and I think the six is still somewhat supported as that engine (and the V8) are still out there working. But the marine specific parts might be a big problem.
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Old 09-04-2018, 07:47 PM   #7
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Mack must be one of the very few diesel engines that are not in the Boat Diesel database. I have looked at a catamaran locally that has the ME7's in it. Performance appears very good, but I am wary of buying a boat with them, given their rarity.
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Old 09-04-2018, 09:42 PM   #8
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In 2000 Mack expanded into marine applications with the ME7 and ME9. The boat is a 1989, this makes it a repower. Hard to say if you got something very cool or something that is an orphan.
Agreed. I was with Mack when they began selling the E-7 for marine application, including to Merlin. The E-7 was an awesome performer. It had a 5” main bearing diameter. If they’ve been cared for at all and are under 650 HP, they should give good service. Torque ratings of even the truck version of the EM7-300 was 1460 at 1020 RPM so stringers and motor mount condition is critical. Some were re-cammed and timed to take some of the low grunt out of lighter boat applications. I may have some literature stuffed away somewhere if you know the HP.
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Old 09-07-2018, 01:54 PM   #9
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https://www.boattrader.com/listing/1...eti-103315396/



I see this has a Mack engine in it.... is this some sort of a backyard or shop project refit? I work on my own tractor trailers and this kind of caught my eye. Thanks.


I’m replacing the shaft bearings y self and was thinking of pre ordering them but it has become apparent I should wait till I have hauled the boat so as to measure what’s there .
Thank you for your reply
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