[C320-list] Motor mount change out

[Ken]

Thanks Greg!  Not having to lift it will certainly simplify the project.  Do you remember if the “mounting bolts” you removed were the horizontal ones that hold the brackets to the engine or only the vertical ones that hold the bracket to the rubber mount itself?
Thanks again for the response.
Ken
MoonDancer 1089
2006

Sent from my iPhone

> On Jun 23, 2022, at 9:56 AM, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
> 
> Hi Ken,
> 
> I changed out my mounts 2 years ago. Your boat is only slightly newer than mine so you’ve done well with yours. I did this with a friend who also happens to be a diesel mechanic certified by Yanmar. We did not need to lift the motor. We loosened all the mounting bolts (needed a breaker bar for a couple) and then replaced the mounts one by one. With that kind of help it took less than an hour. He then adjusted each until the engine was perfectly aligned with no “chattering” of the drive shaft throughout the RPM range. This was really just fine tuning the mounts.
> 
> Good luck,
> Hoop Dancer #1076
> Sidney, BC
> 
> Greg
> 
>> On Jun 23, 2022, at 6:13 AM, Ken <kspir4 at cox.net> wrote:
>> 
>> Ahoy,
>> Looking for advice on motor mount change outs. During shakedown this year I noticed some vibration in the shaft and heating in the shaft seal. Once in the slip, I put trans in neutral and could easily turn the shaft in both directions by hand from down below (so it’s not the seal). Started the engine (yanmar 3ym30) and shaft vibrated in what appeared to be a bit up/down and left to right. Engine starts easily and sounds good when running (so doesn’t appear to be a cylinder issue). I checked the motor mounts and all seem to be in various states of wear. One or two appear o have upper metal cover in contact with lower metal base. Fairly certain mounts are the root cause.
>> I’m ordering two 100s for forward and two 75s for aft. Is there any advice on:
>> (1) how to lift the engine (e.g., where the lifting points are To lift from above or what kind of Jack fits underneath and where to place it to lift from below)
>> (2) is it necessary to remove the support brackets (The bracket that connect the top of the mount to the engine) for each Mount? Likely have to remove that bracket for the port aft mount due to accessibility (or lack there of).
>> (3) any other advice for the changeout or the subsequent alignment? I have the basic process down for alignment but welcome any advice not included in the owners manual.
>> Many thanks,
>> Ken
>> MoonDancer 1089
>> 2006
>> 
>> Sent from my iPhone