need help for engine replacemet

stevebirch2002 · Feb 13, 2005

Hi Akif

You need to keep to 25mm diameter for the shaft as this is the original size of the sterngland and stern bearing systems. A length of about 1.2 metres is needed which can always be cut to size as it will be a little bit too long. Prop should be about~:

2 blade 13x9 RH

3 Blade 12x8 or 12 x9 RH

Which Yanmar were you thinking of using:

1GM10 has about 9HP
2GM20 has about 18HP

Have a look at the Beta BZ482 as well. Many have been installed into Vegas (over 100 fitted in the last five years)

Kind Regards

Steve Birch

pelagicasd · Feb 13, 2005

I did the Yanmar replacement a few years ago. Used a 1" diameter shaft,
(just about 25mm). If my memory serves me 1" is 2.57cm. Still haven't got
the prop completely dialed in. Proper size is going to depend on how much
weight you have on board. If I was going to do it again I'd go with the
Beta. Fuel consumption was much higher than I expected. Water pump impellor
changes require removal of the pump. Oil changes are also difficult as
access to the drain sump can't be visualized. (the dip stick is on the side
of the engine and after it's installled you can't see it) I put in the 2GM20
and it has more power than you need. Extra power is fine for a planning hull
but on a displacement hull its just a waste. I'm pretty sure that the Beta
also weighs less and the less weight a displacement hull has the faster it
will move. There will be times when you want to move as quickly as possible.
Installation will require fabrication of a new bed for the mounts. From
others I have talked with boatyards charge about the same price as the
engine costs to install it.
Good luck with whatever you choose. Walt, S/V Lyric

mphalv · Feb 13, 2005

We used a one inch shaft on 1GM10. Did it ourselves with minimal adjustment
to the engine mounts. Powers ok but could use a little more.
Will proably got with a Beta when this one dies.

Paul
Double Fantasy
Bangor Me.

mphalv · Feb 13, 2005

Steve,
Where did you get the prop recommendations? The prop on our Yanmar 1GM10 is
three bladed and the same size as the two blade. I always wondered how they
came up with that size.

thanks for the help.

Paul

wxt8981 · Feb 13, 2005

Hi.:

I've replaced the 0-21 Albin engine with a 1GM-10 Yanmar.
Please be aware, it requires a new engine mount foundation.
I did it all myself, its a dusty job, but not difficult.
Like Steve writes, get a 25 mm shaft (and keep the stuffing
box). I have a 13" 8" prop. The Yanmar's operation speed is
from idle at about 900 RPM to 3600 RPM. At 3000 RPM it
pushes me 6.5 mph (calm sea, no wind); at idle I have
enough headway to enter the slip.

About exhaust system: I replaced the mixing elbow with a
10" riser; this helps to eliminate of having any water
getting into the engine. And get a Vetus Waterlock and
vented loop.

The 1GM-10 should cost you about $4,900.00 + another 200
for piping, waterlock etc.

Good luck, Wilhelm, V-257

mphalv · Feb 13, 2005

Wilhelm,
Have you had a problem with installing a secondary fuel filter on the IGM10.
I had to add a secondary fuel pump to get the fuel from the bilge fuel tank
to the engine but still frequently have a problem with aair requiring extra
and frequent bleeding. For the last two years, I took the secondary filter
entirely out of the system and "presto changeo" no more air. But it worries me
not thave a decent secondary fuel filter.
What kind do you use? And lift pump if any.

Paul
Double Fantasy
Bangor Me.

mphalv · Feb 13, 2005

Wilhelm,
Forgot to ask.
What size prop.

Paul
Double Fantasy
Bangor Me.

stevebirch2002 · Feb 13, 2005

Hi Paul

There is a calculation for the size.

You need the following:

HP of engine (Beta 13.5)
Reduction of the gearbox (Beta 2:1)
RPM of the engine (max) (Beta 3600rpm)
waterline length of the boat (23 fwwt Vega)
Type of displacement of the hull (Long Keel - Heavy Displacement)
Weight of boat (Vega is about three ton)
Maximum Aperture of blade that can swing in the space less 10% (Vega 14")
Number of blades

Have a look on the web for the calculation

Hope this helpsSteve Birch

wxt8981 · Feb 13, 2005

Hi.:

me again.. sorry, I was a little low on the cost estimate.
The 13"8" (right hand) prop about $250.00, 25 mm shaft
(I've got that one from Holland) about $200, machine shop
cost for prop- cutting to correct lengh- about $50,00,
Morse single lever control + cable about $ 300, riser for
exhaust about $50,00, hoses, clamps etc another $100.00

Make sure to get new a new pushing for the stearn bearing,
it costs little, but since the shaft is out, it's easy to
replace! And take a look at the stuffing box- if it needs
any replacement of the bush or rings... do it!

Wilhelm, V-257

imbissfrank · Feb 13, 2005

Hi Steve,

This has nothing to do with engine replacement. But it is something that has been driving me crazy for months. I know what "Lang may yer lum reek" means, but what the hell does "Och aye the noo" mean?????

Frank Gallardo
Cin Cin V-2184
Fair Winds and Following Seas

Steve Birch steve@... wrote:
Hi Paul

There is a calculation for the size.

You need the following:

HP of engine (Beta 13.5)
Reduction of the gearbox (Beta 2:1)
RPM of the engine (max) (Beta 3600rpm)
waterline length of the boat (23 fwwt Vega)
Type of displacement of the hull (Long Keel - Heavy Displacement)
Weight of boat (Vega is about three ton)
Maximum Aperture of blade that can swing in the space less 10% (Vega 14")
Number of blades

Have a look on the web for the calculation

Hope this helpsSteve Birch

stevebirch2002 · Feb 13, 2005

Hi Frank

From Nick who lives in the Western Isles

Oh yes, quite right - at this moment in time.

- Nick

Cheers

Steve B

imbissfrank · Feb 13, 2005

Thanks Steve, at last I can sleep
Steve Birch steve@... wrote:
Hi Frank

From Nick who lives in the Western Isles

Oh yes, quite right - at this moment in time.

- Nick

Cheers

Steve B