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12-09-2013, 18:39
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#1
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Registered User
Join Date: Sep 2012
Location: Maine
Boat: Bristol 24
Posts: 101
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Replacing A4 With a Yanmar 8HP Diesel
When I do this, should I also add some form of vibration pads under the engine mounts?
By the way, in replacing everything - engine, transmission, shaft, prop, fuel tank, hoses, wiring, gauges, exhaust - you know, everything.
While I've never done this before I'm a glutton for punishment and have a bit of mechanical sense to me.
Any advice would be greatly appreciated.
Thanks,
Dan
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Keep Calm & Carry On
Dan
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12-09-2013, 19:42
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#2
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Moderator Emeritus
Join Date: Aug 2005
Location: Carlsbad, CA
Boat: 1976 Sabre 28-2
Posts: 7,505
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Re: Replacing A4 With a Yanmar 8HP Diesel
The Yanmar motor mounts are huge soft rubber affairs. Not a problem with vibration on my 3GM. If they use those mounts on your engine, shouldn't be a problem. The Yanmar mounts are horribly expensive and not so long lasting however. The Yanmar mounts themselves had delaminated with under 400 hours run time though quite a few years. Changed to after market mounts when I reinstalled the engine to get more room among other things.
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Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
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14-09-2013, 10:13
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#3
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Registered User
Join Date: Sep 2012
Location: Maine
Boat: Bristol 24
Posts: 101
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The boat that I took the yanmar out of didn't have any vibration pads. Thought that was a bit odd, but, wasn't sure. Three Catalina that I've just picked up is the first boat that I've had with an inboard.
While I've got the old A4 out, I'm going to redo the sound proofing. There are openings to the sail locker - think I should build some sort of door there?
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Keep Calm & Carry On
Dan
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14-09-2013, 13:08
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#5
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Registered User
Join Date: Sep 2012
Location: Tacoma, WA
Boat: Catalina 27 std rig
Posts: 25
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Re: Replacing A4 With a Yanmar 8HP Diesel
Hi, what are you going to do with the A4 engine that you removed? I might be interested in buying it if the price is right. PM me if--?
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14-09-2013, 13:33
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#6
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Registered User
Join Date: Sep 2012
Location: Maine
Boat: Bristol 24
Posts: 101
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Quote:
Originally Posted by CAELESTIS
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I've got a bubbler that came with the yanmar. That looks like the same kind of thing as that muffler. Not sure, though. The bubbler is a stainless tank that the exhaust routes through. it ends up with water in it. I thought it was about cooling the exhaust, but, maybe it also helps to quiet things down.
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Keep Calm & Carry On
Dan
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14-09-2013, 17:35
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#7
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Registered User
Join Date: May 2009
Location: Massachusetts
Boat: 40' Silverton Aftcabin with twin Crusaders
Posts: 1,792
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Re: Replacing A4 With a Yanmar 8HP Diesel
Quote:
Originally Posted by Muscongus
When I do this, should I also add some form of vibration pads under the engine mounts?
By the way, in replacing everything - engine, transmission, shaft, prop, fuel tank, hoses, wiring, gauges, exhaust - you know, everything.
While I've never done this before I'm a glutton for punishment and have a bit of mechanical sense to me.
Any advice would be greatly appreciated.
Thanks,
Dan
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Dan--
If that engine has a horizontal piston, you will be sorry!!! I had a Yanma 12HP in my sailboat, what a PIG! I had to redesign the entire motor mount structure to keep the life lines from resonating and when they did so, they swung up and down at an unbelievable rate.
Again, if it has a horizontal piston learn more about it before you install it. Worst of all, the pig cannot even be converted to a decent anchor!
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14-09-2013, 21:54
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#8
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Registered User
Join Date: Nov 2008
Location: Seattle
Boat: Wauquiez Centurion 49
Posts: 783
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Re: Replacing A4 With a Yanmar 8HP Diesel
Quote:
Originally Posted by Muscongus
I've got a bubbler that came with the yanmar. That looks like the same kind of thing as that muffler. Not sure, though. The bubbler is a stainless tank that the exhaust routes through. it ends up with water in it. I thought it was about cooling the exhaust, but, maybe it also helps to quiet things down.
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Not the same thing. That is the standard water lift muffler. The separation muffler drops the sound another 20db and is secondary to the waterlift. These are commonly used with gensets.
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17-09-2013, 03:43
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#9
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Registered User
Join Date: Sep 2012
Location: Maine
Boat: Bristol 24
Posts: 101
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Another concern is the angle of the shaft. I'm thinking that there will be a difference between the two motors.
Is there a flexible coupling or something that can make that variation no big issue?
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Keep Calm & Carry On
Dan
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17-09-2013, 03:46
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#10
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Registered User
Join Date: Sep 2012
Location: Maine
Boat: Bristol 24
Posts: 101
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I've got the shaft and prop (and stuffing box for that matter) from the Hunter 27 that the yanmar was in. I tried to take everything so that the problems would be minimized.
__________________
Keep Calm & Carry On
Dan
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