If Your Engine Mount Is Broken . . .

[ato]

then it will look like this...

[chuckg5]

sharp photo. what alerted you? did you have vibration problems? I've got what looks like 30 year old mounts on a 85 hp lehman that makes me think of what happened to you
chuck

[marshmat]

I take it that's your mount, Ato, and that it failed at a very inopportune moment, and that you are not the least bit thrilled about the prospect of replacing it?

[ato]

yup, this is the forward port side mount on my engine. the others are still good. both forward engine mounts port&starboard will be replaced.

actually i did not realize this and was alerted only by the guys who change the prop shaft and cutlass bearing now. my engine had a slight vibration during low rpm, like between 1000-1500 rpm. i thought it was due to the failed cutlass bearing... at cruising 2200 rpm i did not feel any excessive vibration. due to the light rust coat on the shear surface it seems to have happened several weeks ago.

another problem that i can solve with money...

[ato]

One question: the port side engine mounts are type 150 and the starboard mounts are 100. Why the difference? I intend to replace the port mounts with 200, which hopefully goes well.

[senormechanico]

Different ones due to engine torque?

[ato]

It seems that on my boat the builder put two mounts type 150 on the port, two type 100 on the starboard side. I heard this from other Jeanneau owners as well. Might be due to the torque, as senormechanico suggested.

Now our Yanmar here recommends to put two mounts of the same type in front of the engine, and two of the same type behind the engine. That view is supported by our local boat yard mechanic as well.

2 different opinions, so who is right?

[NCboatrx]

Ato, I suggest that you follow the engine manufacturers recommendation for the flex mount location.
Stanley

[ato]

Done, we set 2x type 200 mounts (brand new) on the port, 2x type 100 mounts on the starboard side (original mounts), aligned everything, and the engine has very little vibrations now. i am very happy with the job done by my boat yard here!

[Triton106]

Ato,

I found the following information from the Yanmar manual. I don't know if your engine model match any of the following but it seems that the key is to match the same mount in the front or rear.

Engine model Front Rear
1GM 70 50
2GM 100 75
3GMD 100 75
3HM 100 100