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Old 03-09-2016, 09:29 AM   #21
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Sure, no doubt Gardners are wonderful motors, but a rebuilt one prices at about $10,000 to $15,000 more than brand new, modern iron - like a Deere or a SISU or similar. Budget, emissions, etc., all come into play when it comes to making that decision.
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Old 03-09-2016, 11:38 AM   #22
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Old 03-09-2016, 12:01 PM   #23
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Am I on the right track to think Twin Disc is the more common among the size boats we talk about here?

Do most engine builders seem to stick with the same gear makers through the product line? ie; Cummins coupled to TD. Or is the gear choice one that the boat designer/engineers make?
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Old 03-09-2016, 12:17 PM   #24
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VOLVO MS-3 all mechanical transmissions. I had one slipping a couple of years ago, pulled it out of the boat, and lapped in the shifting cones. Popped it back into the boat, no problems since. A really enjoyable DIY project.
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Old 03-09-2016, 12:47 PM   #25
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Velvet Drive(s) - appear original and unmolested, zero issues, consistent good oil analysis results, ~ 1700 hours
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Old 03-09-2016, 01:12 PM   #26
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Quote:
Originally Posted by Hawgwash View Post
Am I on the right track to think Twin Disc is the more common among the size boats we talk about here?

Do most engine builders seem to stick with the same gear makers through the product line? ie; Cummins coupled to TD.

No. They aren't. Just that the Twin Disc guys like to flaunt it and rest of us are green with envy, grovelling away in the background keeping our mouths shut. Twin Disc's are common on commercial vessels. Many of the older trawlers are equipped with Ford Lehman 120 or 135's coupled with Borg Warner Velvet drives. That's what I have. One of my commercial fisherman buddies suggested I take off "that light weight thing and put on a Twin Disc." If the BWVD ever failed, my choice would be a Twin Disc with a trolling valve.

True story. Just before we got PH, we purchased a former Geoduck boat, 42'. It had something we wanted so we took what we wanted off and gave the boat away to a prawn fisherman from Lasqueti. It had a 671 with low hours and a Twin Disc. I was frightened by the salvage issues at the time. Knowing what I know now, maybe I would have towed it to Shelter Island and done the salvage myself. But hey, I had just retired and was overwhelmed with my shiny new to us boat.


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Old 03-09-2016, 01:25 PM   #27
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Old 03-09-2016, 01:47 PM   #28
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BW 2.5:1 been there since '62 as far as I know. No problems. Only 50 HP though.
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Old 03-09-2016, 02:46 PM   #29
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Brooksie,
Perkins I spose. Is it the smaller of the two old fours bigger than the 107/108? How many tons per hp do you have? The W30's are well powered but I think all the 40's are a bit overpowered.
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Old 03-09-2016, 03:29 PM   #30
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Old 03-09-2016, 04:52 PM   #31
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BW velvet drive at 1.9:1
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Old 03-09-2016, 05:29 PM   #32
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No. They aren't. Just that the Twin Disc guys like to flaunt it and rest of us are green with envy, grovelling away in the background keeping our mouths shut.....


....snip.....


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I wouldn't be jealous...a lot of BW velvet drives out there doing just fine.

The BW Velvet Drives on the assistance towboats I used to run took more abuse in one season than most trawler guys would put them though in a lifetime. The one on the tow boat I ran only got oil changes probably every 1000-1500 engine hours....still going strong.
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Old 03-09-2016, 05:51 PM   #33
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Kanzaki KM3P4 2.61:1 bolted to a 56hp Yanmar 4JH3E. Seems just fine at 1,700 hr. This trans has a 'torque limiter' (a slip clutch) on the output flange that is supposed to protect things somehow. Time will tell
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Old 03-09-2016, 06:57 PM   #34
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Allison MH 20s on my sporty, huge gears, indestructable, only fit DDs. BW Velvet Drives in my trawler 2.91s. Not my favorite gear, kinda light.
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Old 03-09-2016, 07:05 PM   #35
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Original Allision MH 30 (that's 3:1) behind the original GM 3-71 in Skookum Maru. Which will go first, the trans or the engine? No sign of it happening anytime soon, 60 years, 9,000 hours so far.

I wish there was a trolling valve for it though.
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Old 03-09-2016, 07:36 PM   #36
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I've got a ZF 25A. Drop centre and a 7 degree down angle, which allowed me to mount my engine level. The gearbox is a bit of overkill for 42hp, but the cost wasn't much higher than the ZF15A suggested by the dealer.

I would have preferred a higher ratio than my 1.98:1 but I was too impatient to wait another 4 weeks for a 2.7:1 to come in. Just had to pitch the prop to suit.
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Old 03-09-2016, 08:27 PM   #37
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Perkins 6.354 4M w/ BW VD 10-17 2.57:1 at 4600 hrs. Still going...
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Old 03-09-2016, 08:57 PM   #38
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Hurth 630A 2:1
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Old 03-09-2016, 11:57 PM   #39
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BW VD at 6000 hours, still going strong, no issues.
Xs:"I would kill for a 6 cyl Gardner. Once you buy one, you have to polish them and once you've done that you need to take it out of your boat and put it in your living room, next to the 1970 Bonneville and the BSA Gold Star."
Out cycling the other day and my old car was about to left turn in front of me. I shouted " Hey, that was my car in 1969!" he "well its mine now" and away he went. 1965 GTO convertible. 389 quad, 4 speed. 345hp, no power accessories, not even power brakes. All power to the rear wheels. I sold mine when it was totally worn out, in about 1972. Would be worth almost as much as my boat if in as good condition as the one I saw.
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Old 03-10-2016, 12:02 AM   #40
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Twin disc MG509 2.47:1 on Cummins 555's, 2" shafts
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