Replacement of Yanmar Engine Mounts

[ITMaster]

After doing the forum search I didn't come across one specific to my question. Has anyone replaced their engine mounts with mounts other than the Yanmar mounts? If so, did you find them to cost more or less and were you pleased with the results? More or less vibration and or noise? I'm hoping that someone may have done this within the last year or so. 3JH3E is what I"m working with, 40 HP 3 cylinder.

Thanks, Tom

 

[woodster]

it is best to use original mounts as opposed to after market you will wish you had in the long run these little engines have some rpm spots that make them shake like the devil and the factory mounts relive that trauma with great success i know they are expensive but you can get about 10 years life out of them if you do a good alinment on the install and check it annually

 

[Ralph Johnstone]

Has anyone replaced their engine mounts with mounts other than the Yanmar mounts?

They couldn't possibly be more expensive. This is for a 2GM20F and I'm sure your three cylinder would be even worse. However, as Woody says, don't go with substitutes.

Ever since I had to replace this little bugger in 2009 because of a small fuel leak, I've treated all of them like the holy shroud. All of them are still good after 15 years (except 6 for the replacement) and showing a clearance of about 3/8". My tell-tale for deterioration is in the alignment check every other year. Engine is just not dropping .................... or maybe the stern tube is dropping at the same rate .

Once you replace them, keep them sterile and they should last for a good number of years.

 

[woodster]

you can get them in p cola at bells marine for about 160.00 apice check with mastery in clearwater and see if they have some take offs from having to modify something

ps the mounts are the same on the 2 cylinder as on the 3 cylnders

 

[ITMaster]

Thanks; this is what I wanted to know. Actually PPI makes a replacement mount that costs more than the Yanmar Mounts do I believe. I need to replace the PSS Shaftseal and I am still running the original mounts and know they need to be replaced. Figured that I would go through the alignment process only once since it is such fun to to LOL

 

[Ralph Johnstone]

Figured that I would go through the alignment process only once since it is such fun to to LOL

Be sure you do this either in a remote location or very late at night. The language can get a might testy :cussing:.

I changed out the one mount without lifting the engine and depending on your access, you could probably do all four without lifting the engine.
It was the mother of all creation (just due to access) but in the end, everybody was nicely aligned.

I remember aligning the engine a year after purchasing the boat new in 1999 and was blown away by the misalignment. Didn't even bother to measure, it was so bad. Mind you, when you consider the boat had never seen water before that, it does make complete sense. Makes you wonder what other new boats are like which have never been aligned .

PS - have to ask why the mounts need replacement after only 11 year ?

 

[Allan12210]

After doing the forum search I didn't come across one specific to my question. Has anyone replaced their engine mounts with mounts other than the Yanmar mounts? If so, did you find them to cost more or less and were you pleased with the results? More or less vibration and or noise? I'm hoping that someone may have done this within the last year or so. 3JH3E is what I"m working with, 40 HP 3 cylinder.

Thanks, Tom

Just to be the contrarian I replaced my motor mounts with non OEM the second set of Yanmar specific mounts got too squishy. The post is here.

http://hunter.sailboatowners.com/in...&cat_id=1000&aid=7569&page=article&mn=General


After about 9 years, they are still providing a smooth, vibration free experience. What else can I say?

The model number I used was the Barr 8-0001. I've seen them in photos on other engines (Volvos, Westerbekes, Universals), so they must be good enough for my Yanny. One source is here:

https://www.marinepartssource.com/p...cat1=5&mcat2=0&mcat3=0&Category=Engine+Mounts

A filler piece is needed to elevate these mounts to the same height as the OEM mounts, but that is easy to fabricate.

 

[Ralph Johnstone]

Just to be the contrarian I replaced my motor mounts with non OEM the second set of Yanmar specific mounts got too squishy.

Always some one has to start confusing things with facts .

Interesting, the complete difference in design of the two mounts. The original Yanmar looks as if it's more far more flexible (even with harder rubber) due to the large cross sectional shear while your replacement mount is based on vertical compression of a relatively small surface area.

Without a complete study of the two, I have no idea which is better. However, as you say "After about 9 years, they are still providing a smooth, vibration free experience. What else can I say?" Case closed as far as I can see.

Did you allow for the fact that the rear mounts are heavier than the front mounts ? I believe the heavier rating is for the transmission.

 

[Waybad]

I did not like the Yanmar mounts, as I did not trust them as fail safe. I also bought bar mounts and used a spacer. I apparently put to stiff of mounts in as the harmonics was terrible. I only had a few RPM I could run at.
I just bought new mounts from fisheries that are from R&D, they have a spacer so they fit and also are a better replacement and are fail safe if I ever rollover. I will try to attach a pdf. Good luck
Later
http://forums.sbo.sailboatowners.com/attachment.php?attachmentid=87938&stc=1&d=1431368198

does not look like My PDF attached, instruction on downloading need improvement. PYI carries R&D mounts and couplings good stuff

 

[kloudie1]

I replaced my Yanmar mounts with new Yanmar mounts a couple of years ago. Price was so close to non-oem that I went oem. Of the four mounts I changed out, three were still OK .. after 25 years. The thing about the originals is that they are really stiff fore-aft and really soft port-stbd.. and kind of in between in vertical. The fronts are a different stiffness from the back ones..This kinda tailors them to the peculiar vibration patterns of an in-line three cylinder (an in-line 6 can be pretty much perfectly balanced in primary and secondary... an in-line 3, not so much!) .. The difference between the oem and good non-oem mounts probably can be measured with instruments, but probably not much seat-of-pants difference on the boat.

 

[Allan12210]

Always some one has to start confusing things with facts .

Interesting, the complete difference in design of the two mounts. The original Yanmar looks as if it's more far more flexible (even with harder rubber) due to the large cross sectional shear while your replacement mount is based on vertical compression of a relatively small surface area.

Without a complete study of the two, I have no idea which is better. However, as you say "After about 9 years, they are still providing a smooth, vibration free experience. What else can I say?" Case closed as far as I can see.

Did you allow for the fact that the rear mounts are heavier than the front mounts ? I believe the heavier rating is for the transmission.

Ralph,

I know, leave it to me to be different. When I was a kid in the boy scout parade, my mom said "Look everyone is out of step except Allan!"

I got the idea from Fred Ficcara who was a very prolific poster many years ago. I still miss his sage advice. He had gone that motor mount route and had good success with them. Each Barr mount is rated for 350 pounds, so I felt they were adequate all the way around. I think the OEM mounts are different front and rear because they do flex so much and additional weight bearing is required on the back ones.

One thing that appeals to me on the Barr Mounts is how low I can mount the engine on the studs. That was through the choice of the spacer I have underneath them. It decreases the leverage that the motor can exert on the mount so it is very stable. My motor runs pretty smooth on its own, so I'm not appreciably transmitting vibrations into the boat. As my OEM mounts would wear out, the motor seemed to wobble so much that the prop shaft contacted the stern tube. I just thought I would try something different and it has been acceptable. Of course it's purely subjective and I have no real vibration data to present. Can't beat the price though.

Allan

 

[rpwillia]

FWIW

On my Universal as the OEM mounts were unavailable I used these and they have been great. http://www.avproductsinc.com/mobile-marine/mounts.html

They made a significant different in sound and vibration. Additionally, the bolts to hold the engine are not welded on so if you need to replace something there is no need to pull the engine up. Going on 3 or 4 years with them with no problems at all.

 

[ITMaster]

Thanks everyone for what I consider to be good input; all of it and I see both pros and cons with both the OEM and the Aftermarket. Strange thing that I find is that my OEM mounts are different in that there are 200's on the front and 150's on the rear. And at this time the front mounts seem to be brand new after 10 years and close to 1500 hours and the rear mounts are shot; the back of them has the support bar sitting on top the base of the mount. From my perspective the rear has far more force to deal with and those mounts should be at least as robust as the front ones are. I've seen the PPI aftermarket mounts and I want to look at the Barr's as well. I know that Mastery up the road will hold a gun to my head and have me hold my hands up in the air during the transaction so who knows what I'll do at this point.

I appreciate your good replies from all of you; sorry I just got back here, been busy. Thanks again, Tom

PS: Allan; I swear if you weren't out in California, I would say you were one of the kids in my troop that was the ever constant non-conformist. Don't worry, I kicked sand on all the other kids when I played in the sand box

 

[arf145]

When putting in a new shaft and getting new mounts on my last boat the shop decided on their own to use some non-Yanmars. Cost was similar. They liked them because they kept the shaft steadier. I guess that was true, but they didn't mention the added benefit of the constant deep tissue massage I got every time we ran the engine. I had them go back to Yanmars.

 

[Benny17441]

it is not a job you would want to do more frequently than necessary. Motor mounts are components that may seem or look to be good when in reality they could be shot. If you are getting undue engine vibration and they are 10 years or older I would say replace.

 

[ITMaster]

They are definitely shot since they are sitting on bottom. Sounds like I may want to go back with the Yanmar's however I'm thinking that the rear ones are not as robust as the front ones are. Stampings on them are; Front: 200 Rear: 150

 

[woodster]

those mounts are 148.53 each at toad marine

 

[rpwillia]

On my Universal as the OEM mounts were unavailable I used these and they have been great. http://www.avproductsinc.com/mobile-marine/mounts.html

They made a significant different in sound and vibration. Additionally, the bolts to hold the engine are not welded on so if you need to replace something there is no need to pull the engine up. Going on 3 or 4 years with them with no problems at all.

Here were my numbers
RPMs Ambient 1000 1300 1550 2500
Cabin - Old 39.2 87.7 76.7 82.8 88.3
Cabin - New 42 83.2 94.9 95.9 94.9
Cabin - Cover Open - Old 39.2 92.2 93.4 94.9 93.1
Cabin - Cover Open - New 42 95.1 88.4 84.1 91.9
Cockpit - Old 55 84.7 68.5 76.7 80.7
Cockpit - New 52 71.7 75.1 70.6 77.2