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Old 12-02-2008, 06:28 PM
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Default 28 bertram diesel repower

I am considering a 1973 28 bertram repower. Will cummins 6bts fit?. I know yanmars will, but they are pricey. any other suggestions are welcome. I don't have the cash for brand new engines so I am looking for rebuilts or low to medium hour somethings. Thanks.
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Old 12-02-2008, 06:50 PM
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Default RE: 28 bertram diesel repower



I'm just sayin'
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Old 12-02-2008, 06:54 PM
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Default RE: 28 bertram diesel repower

One of the diesel guys will be along shortly.

In the meantime, try www.boatdiesel.com; in fact, on the homepage, there is an article about repowering a Bert with Yanmars.

good luck!

Randy
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Old 12-02-2008, 06:59 PM
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Default RE: 28 bertram diesel repower

If your Bertram came with gas engines from the factory, the 6BTs will not fit. If it came with diesels then you would have the larger engine room and they would fit.

I am in the process of repowering my 1972 Bertram with 350 Mercruisers. Unless you need the range, a diesel repower doesn't make economical sense with fuel prices where they are today.

Cliff
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Old 12-02-2008, 08:00 PM
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Default RE: 28 bertram diesel repower

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coolmc999 - 12/2/2008 6:59 PM If your Bertram came with gas engines from the factory, the 6BTs will not fit. If it came with diesels then you would have the larger engine room and they would fit. I am in the process of repowering my 1972 Bertram with 350 Mercruisers. Unless you need the range, a diesel repower doesn't make economical sense with fuel prices where they are today. Cliff
IMO a 28' Bert would be one of the few cases where resale is a important factor in considering a diesel repower. Also here on the left coast red dye diesel has always been cheaper than gasoline so it depends on where you are in factoring fuel savings.
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Old 12-03-2008, 04:16 AM
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Default RE: 28 bertram diesel repower

The 240 hp Yanmars are perfect, I have a friend who repowered his bert from gas to them. He runs charters and has over 8K hours with no troubles. Make sure you upsize your shafts.
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Old 12-03-2008, 04:47 AM
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Default Re: 28 bertram diesel repower

Why don't you look at the Cummins Diamond 4B-250's. They will fit with no issues, and 250 hp will be more than equal to the twin 5.7 gassers that came with most of the 28's. Plus, I think you can still get them as factory recons (essentially new motors)? which are about 40% less than new with full warranty from Cummins.
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Old 12-03-2008, 06:24 AM
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Default Re: 28 bertram diesel repower

Cummins 4B are a great choice if you like a boat that shakes like a wet dog. I would look at yanmar, styer, and nanni. Cummins 4b's are shakers.
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Old 12-03-2008, 06:25 AM
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Default Re: 28 bertram diesel repower

boater11. There is NO WAY a 6B will fit in a 28 Bertram. I own a gas powered 28 Bert FBC and a 31 Blackfin Combi with 6Bs. The gas V8s "just" fit in the 28 BERT.
Two suggestions for you.
1. Go to www.sbmar.com website and take a peek @ the repowers Seaboard has done. They just did a 28 Bertram with 4 cyl. Yanmars, all details are the. Cummins 4B's will fit. Either way it will be VERY expensive. In addition to engines, your talking new gears, shaft logs, shafts, struts and props, gauge package, wiring...and that's just the start of it. Figure easily 40-42K just for the engine/gear package. All else plus labor, figure another 10K to be safe.
A better option.
2. Simply buy my turnkey creampuff 77 Bertram FBC. Take a look, make me an offer, lots cheaper and you won't be disappointed. Here's the link:
http://boatdiesel.com/Forums/Thread....hread_ID=28768

Either way, good luck.
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Old 12-03-2008, 02:06 PM
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Default Re: 28 bertram diesel repower

Another choice would be the Volvo D-4 common rails, the highest HP version is now up to 310 and the engine at 260 HP has proven very reliable. They will fit but they will cost much more than the Yanmar 4LH's. rebriel makes some good points regarding the conversion from gas to diesel that you really need to do the math and then see what the payback would be with the diesels. There is a lot more to this than the cost of engines.
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Old 12-03-2008, 04:14 PM
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Default Re: 28 bertram diesel repower

online, absolutely dead on.
It's real easy (like falling in love) to get bit by the "boat fever"......one simply loses his mind.
The fever gets to you....you are blind to the $dollars$ or future $problems$....before you know it......you are married to a VERY expensive boat/project.
Me...been there and have LEARNED!!

As far as boating.....I'm on my second marriage....1st 28 Bert....2nd 31 Blackfin...before I'm dead....2nd divorce and a 3rd new marriage to a DE build!

As far as funding$$money$$ for the boat divorces....been...and will be married to one woman 35+ years.

It's all about the $funding$

Regards, Bill
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Old 12-04-2008, 12:01 AM
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Default Re: 28 bertram diesel repower

While I agree the Cummins-apart are shakers it is really only an issue at idle. Reman 4Bs are pretty bulletproof and are likely the cheapest engines of the options listed in this thread. It won't be a speed demon though.
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Old 12-04-2008, 02:52 AM
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Default Re: 28 bertram diesel repower

Yes they Cummin 6B will fit. I have a customer with a 28 with them in it. We had to pull one last fall to do a trans rebuild, they are shoehorned in but will fit.
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Old 12-04-2008, 03:58 AM
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Default Re: 28 bertram diesel repower

If price isn't the overiding factor - how about Cummins QSD 4.2-310's - they are common rail, light weight, a little cheaper than the Volvo D-4's to buy, significantly cheaper for parts later on, and will make the Bertram 28 a 30 kt cruise speedboat.
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Old 12-04-2008, 06:06 AM
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Default Re: 28 bertram diesel repower

thomas70, 6Bs in a 28 Bertram??? Maybe I'm wrong, with all due respect, I'd have to see a pic of that install.
Additionally a 6B with ZF 220a trans weigh 1500 lbs wet. That would be 3000 lbs. of iron in that hull. That's an extra 1000 lbs of weight vs gassers or something smaller.
Here's a link on a 28 repower with 4cyl Yanmars http://sbmar.com/Repowers.cfm
I can't see a pr of 6Bs with gears fitting.
Bill D
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Old 12-04-2008, 06:25 AM
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Default Re: 28 bertram diesel repower

If the Bertram came from the factory with Volvo diesels, they have longer engine boxes than the gas models and the 6BTs fit. There are some of them around.

With the early 70s gas model, the 6BTs would not fit and the engine hatches would have to be raised for the 4BTs and you would have to factor that cost into the conversion.

Cliff
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Old 12-04-2008, 06:34 AM
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Default Re: 28 bertram diesel repower

Gentlemen:

I know the 28 Bertram very well and you will not get a Cummins 6BT/6BTA inside the factory engine room .. But, if someone wanted to modify the rear bulkhead, or cut into the front bulkhead and raise the decks, redo the log, etc., etc., then I guess you could say "it fits"..........The Cummins 6BT/6BTA is a great engine, but it's not for a 28 Bertram.. IMO, if you are going diesel, the Yanmar 4LHA was made for this boat, although the D4, Steyr, the 4 cylinder QSD, (and maybe the Yanmar 6LPA2 315 if you wanted a 30++++ knot rocket ship) , may also be a good choice.

I think someone above suggested the Cummins 4BTA 250 is available as a RECON?? Nope, it is not.... The 4BT 150 is, and although it is cheap, simple, and super tough, I do not believe it makes for a "nice to be around engine" for a light weight boat like the Bertram.. Also, performance would not be where it should be to compliment such a fine vessel..

BTW, I did some research last week through my factory contacts, and found out there are 6 remaining factory new Yanmar 4LHA 240's left in this country... Better hurry !!

Tony

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Old 01-13-2009, 07:40 AM
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Default Re: 28 bertram diesel repower

Hello,
We looked at re-powering our B-28 with Yanmars, and decided that, at the end of the day, we would never get back out what we put in, and the diesels wouldn't pay for themselves until about year 8 or 10. But we run low hours annually. You have to want to keep the boat virtually forever to consider diesels. Even gas repowering costs more than the boat is ultimately worth. We put in Crusader 300s, and love them--very fuel efficient, and very quiet. We also put in a new Atlantic Custom Welding fuel tank at the same time. Our boat can be seen at www.bertram28online.com.
Best,
--John Glynn
Bertram 28, Proud Mary II
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Old 01-13-2009, 07:57 AM
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Default Re: 28 bertram diesel repower

Just buy a used boat that has been repowered.
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Old 02-04-2009, 05:46 PM
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Default Re: 28 bertram diesel repower

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thomas70, 6Bs in a 28 Bertram??? Maybe I'm wrong, with all due respect, I'd have to see a pic of that install.
Bill D
Ask and you shall receive. Here's the starboard side at the time of my survey.



Here it is after thomas70 reinstalled it.



And here's the port side. Note a short teak riser was installed to accommodate the coolant reservoir cap (all you can see is the white PVC cap).
The hatch itself appears to have been worked down a little at the reservoir.
Also, a doghouse was cut into the rear bulkheads to accommodate the gears.



Here's how they perform:

RPM's / Knots

800 / 6.0 (Idle)
1200 / 8.0
1800 / 15.5
2100 / 20.2
2300 / 21.6
2400 / 22.5
2700 / 26.5 (WOT)





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