Re: New Engine alignment in a SM



Mounts, or alignment.

I believe that even if the mounts were in poor condition, a good alignment would likely result in no vibration.

Did the technician "eye the alignment" (most likely), use the Vetus Coupling to perform the alignment, or use a fixed coupling to perform the alignment (unlikely)? 

If he did not use a "Fixed Coupling," I suggest that you start over with new mounts and a fixed coupling, which can be machined there. I do not have an engineered drawing, but do have a drawing that a machinist can use. Possibly you can buy one at SAV"at" Install new mounts and align with the Fixed Coupling using feeler gauges N, S, E & W. If you did not already, you should have replaced the rubber donuts inside the coupling (inexpensive--$25USD--using Vetus kit K018).

I hope this helps you.


Bill Rouse
720 Winnie St.
Galveston, Texas 77550

On Thu, Apr 18, 2019 at 7:26 AM Craig Briggs via Groups.Io <> wrote:
The "C" drive is in two assemblies:
  • the upper unit (that is coupled to the engine transmission) weighs, I would estimate, about 80 pounds. Below the gearbox of this upper unit is what I recall Olivier calling the "trumpet" which has about a 3 inch  wide sleeve of neoprene-like gasket material around it where it engages the hull structure sealing the flange around the vertical drive shaft hole. Around that is the hose clamped to both the hull flange and the trumpet.
  • The upper unit is supported, then in three places: at both sides of the top by the steel cross members bolted to the engine angle iron stringers and by the trumpet resting on the hull with the gasket in between. None of its weight is carried by the keel.
  • The lower unit weighs, I'd estimate, about 50 pounds and is supported by the keel at the bolt. As I recall there were two washers (shims) under the lower unit on the bolt, plus a rubber sleeve and steel compression sleeve around the bolt. The top is sealed with silicone after the bolt is secured..
  • There is a lifting eye on the engine room overhead straight above the upper unit to facilitate removal and adjustment with a block and tackle. (Feel around inside the insulation.)
If your engineer replaced all the engine frame mounts I could see the possibility of the "C" drive being askew. If he just did the engine then it sounds like an issue with the engine-to-C drive coupling.

Good luck with it.
Craig SN68 Sangaris, Delray Beach, Fl

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