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Sun, December 22 2024, 01:05 [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, [9] ]

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Date Posted: - Wednesday - 08/ 2/06 - 7:10pm
Author: Chuck
Subject: We did it
In reply to: Peter Karczmar 's message, "Repowering M40" on - Tuesday - 08/ 1/06 - 10:05pm

Peter, we re-powered a few years ago with a 4JH3E and used the existing transmission from our 4-108. The re-power went quite well and we have been very pleased with the results. twice the power of the 4-108. You are probably only getting about 27 HP at the prop. we can do 7 knots and 6 in a choppy sea. Now have 1200 hours on the engine and it still chugs along. I have dad Yanmars for many years and am a marine tech by trade. It is the only engine I would consider for a sailboat but that is just my opinion. We advertised the Perkins in BoatUS magazine and could have sold a dozen of them if we had them. The phone rang for over a month after the engine was sold. Good luck.

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Replies:

[> [> Repowering M40 -- Peter Karczmar, - Wednesday - 08/ 2/06 - 10:15pm

Chuck,
Thanks for your thoughts. Did you consider the 75HP version of the Yanmar when you repowered? It seems to be roughly the same size and not too much heavier than the 4JH3E.
Thanks.
Peter


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[> [> [> Yes -- Chuck, - Friday - 08/ 4/06 - 11:19pm

The 75 is just the 56 with a turbo. The turbo runs hot and we did not need to generate more heat in the engine compartment. In addition the turbo usually cuts the life of the engine by about half. The hull speed for Sea Trek is just a little over 7 knots so enough HP to push her over that is just wasted. The turbo also offers more chances for things to break down. We are firm believers that simpler is better.


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[> [> [> [> Repowering M40 -- Peter Karczmar, - Saturday - 08/ 5/06 - 7:42am

Thanks for the advice. That's very helpful.
Peter


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[> [> Repowering M40 -- Peter Karczmar, - Saturday - 08/ 5/06 - 8:06am

Hey Chuck,
One more question. Did you change your prop when you repowered? We have a 16" fixed 3-blade prop. I've been thinking about going with a feathering prop (MaxiProp)although I've heard people both raving about them(especially about their power in reverse)and others saying that they're overkill and a waste of money.
Thanks, Peter


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[> [> [> No we did not -- Chuck, - Monday - 08/ 7/06 - 9:52pm

We are currently running a 17" and I believe it has a pitch of 8 or 9 to get the 3500 RPMs the engine must turn for Yanmar to warranty. Ours is 3 blade with the Mickey Mouse ears. We decided to save the money for cruising and not have another mechanical device to worry about repairing. Good luck


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