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Old 27 September 2005, 13:28   #11
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Country: Norway
Town: Farstad
Boat name: Searafting
Make: Humber Offshore 8,5
Length: 8m +
Engine: 2 x 250 Suzuki
Join Date: Jul 2004
Posts: 68
We have Yanamar 315 engines and we have run 250 without any problems, the same charter boats in sweden run 600-700 hours a year with out any engine problems.
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Old 27 September 2005, 14:45   #12
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Country: UK - England
Town: Southampton
Boat name: Darwin
Make: Ribeye
Length: 6m +
Engine: 150hp Yamaha
Join Date: Jul 2004
Posts: 382
RIBase
Quote:
Originally Posted by Flavio
I don't know if the Hydradrive is better than a Bravo 1 or Bravo 3. Certainly Yamaha has a veru good reputation for reliability and the Bravo 3 drive has a chequered history.
I have been running the Hydradrive leg for 2 years with no problems. OK, so I'm running it on the 4 cylnider 370 sti, but it is the most wonderful leg I've ever used. I drive a lot of boats during the course of a year, mainly with either Volvo or Mercruiser legs - when I get back on my own boat it is such a pleasure not to have to wait for the grinding or cruching - I LOVE MY LEG!!!

I would spec any boat now with Yamaha, my 370 is now on 920 hours, it is not even run in! It starts first time every time, it runs like a dream with no smoke and I can talk at normal voice when at the helm. It's economical - 0.8 litres/nm. There is no massive turbo lag as on the Yanmar - bugger all happens up to about 2.5 k revs then turbo kicks in and it leaps of liek a scolded rabbit - part of the reason why the Bravo 3 has suffered, particularly with the 315!

I'm a Yamaha convert, as far as I'm concerened it's the only engine/drive package to have.
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Old 28 September 2005, 04:07   #13
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Country: UK - England
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Quote:
Originally Posted by Solent Ranger
bugger all happens up to about 2.5 k revs then turbo kicks in and it leaps of liek a scolded rabbit - part of the reason why the Bravo 3 has suffered, particularly with the 315!
Please tell us more, I'm always eager to learn.
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Old 28 September 2005, 04:51   #14
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Country: UK - England
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When I was talking to the Yam guys they were saying the first 315 in the country was fitted to the one of the fishing type boats on the pontoons, it was a USA/Candain built, West coast. I'll try to find the name tonight.

I was told that the new transom shield had twin seals on the stearing shaft unlike the old ones with a single seal.
Jelly
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Old 28 September 2005, 09:07   #15
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Country: Other
Town: Bizerte
Boat name: gourck
Make: GulfCraft
Length: 10m +
Engine: diesel i/o
Join Date: Mar 2005
Posts: 15
Craig,
you're right, you'll have no problems with your 3.7 l engine in particular if it's not on a heavy boat. figures are 3.7 liter for 165hp give a ratio of 44-45 hp per litre and 300hp with a 4.2 liter has a ratio of 71-72 hp per liter that is considered very high for diesel engine ( "norm" is around 50-60 hp / liter).
For instance with Aifo 300hp are delivered with a 5.6 l engine for the most powerful version of the block (54 hp/ l)
Cummins/mercruiser 4.2 l are in the 300hp range (same as Yanmar) and use is limited to 300 hours / year with 1 hour of full load (200rpm less than max) for every 8 hours reduced load. Same block is also available in 200hp light duty version to be used up to 500 hours / year! why such a difference??? the answer is the market demand for light and compact engines that deliver enough power to compete with gas engines.
All commercial engines have less than 50hp/l and rpm less than 2800.
The other problem is that reliable stern legs are not available for high power engines. Better go for shaft if above 300hp (or service and service and service again)
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Old 28 September 2005, 09:16   #16
DGR
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Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
Where are all these restrictions listed?

My Yanmar 315HP does way more than 1 hour in every 8 at max continuous (3600 rpm) and both it and the B2X leg currently appear to be in good health (touch wood, fingers crossed, ). It's also done 200+ hours in the last 8 weeks.

Nowhere does the manual differentiate between operating procedures for commercial and private usage. The limits I observe are to service on time, no more than 2 minutes at max revs (3800) at a time, and to let it warm up and cool down properly on startup and switch off (at least 5 minutes).

D...
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Old 28 September 2005, 09:21   #17
DGR
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Country: UK - Wales
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Boat name: Blue Marlin
Make: Ribcraft
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Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
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Posts: 827
Quote:
Originally Posted by hamadi
Piston problem info I got is from AIFO marine dealer who had the problem on his LUHRS (yanmar / shaft) and did a market investigation to find similar problems.
OK - shaft and cracked piston...

Quote:
Originally Posted by hamadi
The other problem is that reliable stern legs are not available for high power engines. Better go for shaft if above 300hp (or service and service and service again)
OK - so shaft and cracked piston?...

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Old 28 September 2005, 09:52   #18
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Problem 1: high power / l should be avoided
Problem 2: better go for shaft when have 300hp or more
I was referring to the load on transmission and not to the correlation between type of propulsion and engine displacement.
most inboard engines with high power run less than 2800rpm and have a power/ displacement ration under 50/1
sorry for the confusion
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Old 28 September 2005, 10:42   #19
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Quote:
Originally Posted by DGR
Where are all these restrictions listed?

My Yanmar 315HP does way more than 1 hour in every 8 at max continuous (3600 rpm) and both it and the B2X leg currently appear to be in good health (touch wood, fingers crossed, ). It's also done 200+ hours in the last 8 weeks.

Nowhere does the manual differentiate between operating procedures for commercial and private usage. The limits I observe are to service on time, no more than 2 minutes at max revs (3800) at a time, and to let it warm up and cool down properly on startup and switch off (at least 5 minutes).

D...
I had the information when opting for yamaha sterndrives. 240hp for 500hrs / year and 270hp for 200hrs/year.
similar 4.2 l engine is on cummins/mercruiser packages. The restriction is clearly stated on their PDF files (technical specifications) for all powers available with the same block.
the 500 hours/year is clearly stated in the document through the following link:
http://www.cmdmarine.com/PDFs/mercur...d_warranty.pdf
4.2 l delivering 200hp is described for recreational and light duty use
http://www.cmdmarine.com/PDFs/4081834_1104.pdf
same engine delivering 320hp is limited to 300hrs /year
http://www.gce.cummins.com/mce/mce_4...f?SMSESSION=NO

Similar information is available on AIFO datasheets for 5.6 l diesel inboards. 500 hours when power is 230hp and 200hrs when power is 300hp!!!
newer AIFO engines / pleasure duty allow up to 300hrs/year
http://www.maesco.com/products/mar_p..._pleasure.html

the
the 200 hours/year is also clearly stated
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Old 28 September 2005, 11:19   #20
DGR
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Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
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Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
OK - thanks for that.

It may be me being pedantic - but that is the Mercruiser Diesel warranty - not the Yanmar - they don't say that in theirs (even if it does share the same engine block).

Wouldn't those 'rules' make it very difficult to claim anything under warranty? If you can only go at 3600 RPM for 7 and a bit minutes per hour, it is quite limiting!! And if it is defined (by Yanmar) as the Max Continous Operating Speed then that isn't very continuous...



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