The advantage to using a small scissor jack is that you can make small
adjustments that will hold position while aligning the engine with the
propeller shaft. I used one when changing the mounts on my engine and found it
to be useful for that reason.
Steve Thomas
C&C27 MKIII
Port Stanley, ON
----- Original Message -----
From: Robert Boyer via CnC-List
To: cnc-list@cnc-list.com
Cc: Robert Boyer ; Patrick Davin
Sent: Wednesday, August 12, 2015 06:00
Subject: Re: Stus-List Yanmar engine mounts replacement
Patrick:
The yard replaced all four of my mounts when my fuel tank was replaced over a
winter. If I recall correctly, they replaced one at a time and didn't need a
jack. The two aft mounts were the toughest.
Bob
Sent from my iPhone, Bob Boyer
On Aug 11, 2015, at 11:29 PM, Patrick Davin via CnC-List
<cnc-list@cnc-list.com> wrote:
Anyone have tips for replacing engine mounts on a Yanmar 3HM? In terms of
the logistics, like how to prop up the engine, get the old mounts out, etc.
I have the transmission out now for a rebuild (fwd clutch failed) so it's
the perfect time to replace mounts. I'm just going to do the forward two (back
end of v-drive engine) because those are the two the mechanical inspection
(purchase survey at the start of this year) said were delaminating. Plus
Gallery Marine in Seattle has two in stock, not four. If this goes easily maybe
I'll consider replacing the aft two.
I'm going to go with the OEM mounts instead of PYI since several online
reviews said Yanmar OEMs were significantly better (and they look it too - a
lot more rubber for vibration dampening). The engine vibrates a fair amount
now, and a slight misalignment might be what caused the transmission premature
wear.
Copying a mail from Martin below in 2013 on the list. Martin, I'd be
interested in hearing more if you still recall the work you did (even though
your engine is a Perkins, so the mounts are different). What did you mean by
the existing engine mount bolts didn't meet your standards? I'm ignorant of
what the issue with lag and stripped threaded bolts is. I'm expecting the
existing mounts may be hard to get out because the bolts/nuts look a bit rusted
on.
I saw your suggestion of a scissor jack, but I'm not sure where I would
place that? The engine doesn't have super good flat surfaces between it and the
hull. And the plates the mounts attach to look too small to fit a jack in. I've
read that the mount nuts can just be used to raise the engine until its raised
enough to slip the mounts out (block it with scrap wood at that point). Is that
actually the best way? I have some pictures I could upload.
Thanks! Hoping to do this project in the next two weeks, which is how long
it will take Harbor Marine to get to the transmission. I thought boats knew not
to break in the summer months, but I guess not!
-Patrick
S/V Violet Hour, LF38
Seattle, WA, now in Elliott Bay marina
------------------------------------
Martin DeYoung mdeyoung at deyoungmfg.com
Wed May 22 13:38:22 EDT 2013
I replaced all 4 of Calypso's engine mounts (Perkins 4-108) a while back. I
used the R&D Engine Mounts offered by PYI, Inc. As none of the existing engine
mount bolts met my standards ( a combo of lag and stripped threaded bolts) the
job became slightly more complex than imagined at the start.
In 1970 Bruckmann's was laminating a steel plate on top of a wood base to build
up the engine support frames. Once I understood what was under all the
fiberglass and paint I decided to drill and tap new bolt holes, using the older
ones if possible.
The results when finished were worth the effort. I did re-align the
engine/reduction gear to the prop shaft. The engine vibration transmitted
through the hull was significantly reduced with the added benefit of being
confident that the engine would stay put if the boat broached or was knocked
down in a heavy sea.
One of the least expensive tools to purchase that may help is a small scissor
jack to be used in holding the engine in place while changing the mounts. Let
me know if you want more info on how I approached the process, but there is
much already written about the topic available.
Martin
Calypso
1970 C&C 43
Seattle_______________________________________________
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