Patrick,
>Where would you slide the angle iron? Under the rear mounts? The forward >mounts are the ones visible in the picture in the link I sent (in the >drivetrain photo) >Yes it is a v-drive, so that's fwd and the rear of the engine. Those are the >mounts I want to remove. >The very bottom of the engine (oil pan) has only about 1/4" clearance above >the prop shaft log so I suppose I could put something in there. Lifting the engine: When I mentioned using the angle iron I had the engine perspective reversed. I do not recommend you put a load on the prop shaft log unless you are certain it is strong enough. Is there room to put some lumber alongside the shaft log to take most of the load? I have pulled upward with a block and tackle off the boom on several boats that had a lifting eye and clear access. I could not determine from the pictures if you have lifting access to the boom. If you do and use a block and tackle off the boom, support the boom with the main halyard not the topping lift. I know a guy that broke a topping lift that way. >I figured out today that lag screws are like wood screws, and your issue with >them might be that in theory they could pull out of the stringers. I don't >know what the current screws securing the mount to stringer >are, but >hopefully they are lag screws because otherwise I don't know how I'd get them >out. I'll find out when I take them out. > I'm expecting the existing mounts may be hard to get out because the > bolts/nuts look a bit rusted on. Lag bolts: When I earlier referred to poor quality engine mount bolts I was trying to keep the story short. What I found was a mix of SS lag bolts and miss-threaded or stripped bolts. A prior owner used likely the lag bolts when the originals stripped out. I went up a size in bolt and to a more coarse thread and re-tapped the original holes. I installed one engine mount at a time using the other three to keep the engine under control and to give a good base line for mount location. I used the scissor jack to support and raise/lower the engine in small increments. Looking at your pictures I expect you have bolts tapped into the steel channel wrapping the top of the engine beds. It is also possible there is a nut welded under the steel channel wrapped over the engine beds. Before putting a big wrench on those bolts I recommend using PB Blaster or similar penetrating oil and maybe some gentle heat to reduce the chance of breaking the bolt heads off. If the threads strip out it appears there is enough space around the mounts to tap new threads. Feel free the email me direct with any follow up questions. Calypso is moored at Shilshole, E dock in case you are in the neighborhood next Saturday afternoon and want to discuss engine mounts. Martin Calypso 1971 C&C 43 Seattle ________________________________ From: CnC-List [cnc-list-boun...@cnc-list.com] on behalf of Patrick Davin via CnC-List [cnc-list@cnc-list.com] Sent: Tuesday, August 11, 2015 8:29 PM To: cnc-list@cnc-list.com Cc: Patrick Davin Subject: Stus-List Yanmar engine mounts replacement 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<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> at deyoungmfg.com <mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> Wed May 22 13:38:22 EDT 2013<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> 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.<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> 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.<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> 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.<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> 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.<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> Martin<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> Calypso<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> 1970 C&C 43<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E> Seattle<mailto:cnc-list%40cnc-list.com?Subject=Re%3A%20Stus-List%20Yanmar%20Engine%20Mounts%20-%20aftermarket%20replacements%3F&In-Reply-To=%3C23EAE197CC1B594FA8793397EBCD357D7B48ED%40DMI3.DMI.local%3E>
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