Tom, The original Yanmar mounts have a fatal flaw in that if the rubber degrades it can tear and leave the engine un mounted. Some race regulations actually require wire or chain ties to restrain the top and bottom parts should the rubber fail. PYI makes a replacement mount which is positively captured so that even if the rubber breaks down the mount can't separate. The leading cause of the rubber to fail is fuel saturation. The PYI mounts are designed with a metal shroud to shield the rubber.
I ran into Yanmar mounts that were soft enough that the thrust of the prop drove the engine forward. There was enough movement that it opened up the dripless shaft seal. Granted the seal was old and needed tightened or replaced but it was still quite telling to see the fountain of water. I would guess that the engine was shifting about 1/2". PYI calls the Yanmar mounts "marshmallow mounts" and they are designed as such to minimize noise and vibration. I can't sat that I'm upset by the noise and vibration of the PYI mounts. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mon, Jul 9, 2018, 8:49 PM Tom Buscaglia via CnC-List < cnc-list@cnc-list.com> wrote: > I just made an appointment to get them all replaced in a few weeks. I > found a great machinists in Sidney BC. Superior work and currency exchange > discount. > > > Tom Buscaglia > S/V Alera > 1990 C&C 37+/40 > Vashon WA > P 206.463.9200 > C 305.409.3660 > > > On Jul 9, 2018, at 5:04 PM, Ron Ricci <ron.ri...@1968.usna.com> wrote: > > Two of mine were bad and I replaced all four. The parts were inexpensive > and the only issue I’ve had is corrosion on the steel parts. > > Regards, > > *Ron* > > Ron Ricci > > S/V Patriot > > C&C 37+ > > Bristol, RI > > ron.ri...@1968.usna.com > > > > > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] *On Behalf Of *Tom Buscaglia via CnC-List > *Sent:* Monday, July 9, 2018 12:47 PM > *To:* cnc-list@cnc-list.com > *Cc:* Tom Buscaglia > *Subject:* Stus-List Engine mounts > > > > One of my engine mounts on my Yanmar 3HM35F is hopelessly seized. As > they are over 25 years old anyway, I’m wondering if I should just replace > the one that’s messed up or all 4. > > > > Do these things go have an effective life? > > Tom Buscaglia > > S/V Alera > > 1990 C&C 37+/40 > > Vashon WA > > P 206.463.9200 > > C 305.409.3660 > > > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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