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post #1 of 12 Old 09-20-2013 Thread Starter
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motor mounts

How big of a deal is it to replace the motor mounts on a Yanmar 18HP 2GM20F? How expensive, how labor intensive?
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post #2 of 12 Old 09-20-2013
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Re: motor mounts

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Originally Posted by timangiel View Post
How big of a deal is it to replace the motor mounts on a Yanmar 18HP 2GM20F? How expensive, how labor intensive?
The mounts run about $150-$165 a piece. Changing them isn't terribly difficult (depending on how much room your particular installation allows you), until you start realigning the engine and shaft. Even then, it's more tedious than difficult.

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post #3 of 12 Old 09-20-2013
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Re: motor mounts

$150 each is for the Yanmar brand. Others in the 50 range.

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post #4 of 12 Old 09-20-2013
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Re: motor mounts

Slowbutsteady nailed it. I prefer the Yanmar mounts to 3rd party. You will need to disconnect the shaft from the transmission. When I did my 2GM20F I used a small car jack with a board under it to get the little clearance you need to slip a new mount in.

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post #5 of 12 Old 09-23-2013
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Re: motor mounts

I too like the original Yanmar mounts and had to change just one. Occasionally they break. Honest!



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post #6 of 12 Old 09-24-2013
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Re: motor mounts

Wow! If I'm seeing that right, that's an amazing failure! That post bolt is something like 3/4" diameter, right?

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post #7 of 12 Old 09-24-2013
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Re: motor mounts

engines are torquey and do break mounts. we just realigned my perkins engine while in water and re-did mounts--isnt easy , isnt hard to do --must lift engine to do it..one individual did mine solo. also lifted engine slightly high er than it was and secured it--omg a secure and in place engine--i dont know how my boat will get along now---yipes.....


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post #8 of 12 Old 09-25-2013
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Re: motor mounts

I went with Yanmar OEM. Pricey.

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post #9 of 12 Old 09-25-2013
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Re: motor mounts

I've found that if the weight isn't equal on all mounts after finishing alignment, the engine is supported on 3 points.This leaves one kinda bouncing on its rubber and fatigues the bolt faster than the others.
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post #10 of 12 Old 09-25-2013
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Re: motor mounts

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Originally Posted by arf145 View Post
Wow! If I'm seeing that right, that's an amazing failure! That post bolt is something like 3/4" diameter, right?
I was talking to a Yanmar mechanic who said he saw a boat come in with three of those bolts sheared.

I wonder what they were doing to cause that?

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