Tears or cracks in the rubber wound be the final and most absolute indication. Before that you might notice the top metal bottoming out on the bottom metal along with the sounds of metal on metal vibration. The early indicators would be an inability to keep or get the engine properly aligned at the shaft coupling along with a lot of rocking at low speed. The backlash on the 3HM35F is pretty high and when any single engine mount isn't pulling its weight the whole engine rocks pretty violently - particularly at low rpm. If you have a dripless shaft seal you might also start to notice more leakage than usual, particularly when in forward and at high load. A very very early indicator might be a persistent tar/grease/oil substance which doesn't seem to be removable or a crumbly rubber material.
The PO replaced my mounts with a hydraulic dampened mount by vetus. When I got the boat the forward stbd mount had split open and goo was spilling everywhere. https://www.mauriprosailing.com/us/product/VTSMITSTEUN.html?gclid=CjwKCAjwspHaBRBFEiwA0eM3kdwS7oYWiGTGMeWclFhP4WDm2BPaVOIZD0FtPZs4OprHxT5BE_0OnxoC4p4QAvD_BwE https://store.pyiinc.com/products/yanmar-engine-mounts Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Tue, Jul 10, 2018, 6:48 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 > >
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