With someone at the helm in open water, watch the engine carefully as the engine is shifted from forward to reverse. If it jumps, mounts are bad.
On my old Plymouth I'd open the hood, put the engine in gear with one foot firmly on the brake and hit the gas with the other. If the engine lifted up, the mount was bad. Chrysler eventually put steel straps around the mounts. On Tue, Jul 10, 2018 at 6:43 PM, Bruce Whitmore via CnC-List < cnc-list@cnc-list.com> wrote: > Ok, so now you folks have me wondering - how would I determine if my motor > mounts are bad or getting ready to fail? > > I have not noticed any untoward clunking or vibration, but I'm relatively > new to the boat... > > Thanks! > > Bruce Whitmore > 1994 C&C 37/40+ "Astralis" > (847) 404-5092 (mobile) > bwhitm...@sbcglobal.net > > > ------------------------------ > *From:* Josh Muckley via CnC-List <cnc-list@cnc-list.com> > *To:* cnc-list@cnc-list.com > *Cc:* Josh Muckley <muckl...@gmail.com> > *Sent:* Monday, July 9, 2018 10:33 PM > *Subject:* Re: Stus-List Engine mounts > > 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 > > _______________________________________________ > > 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 > > > > > _______________________________________________ > > 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 > > > -- Joel 301 541 8551
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