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Old 08-14-2020, 05:47 AM   #57
bglad
Senior Member
 
City: Green Cove Springs, Florida
Join Date: Feb 2012
Posts: 344
I have encountered a couple instances of engine vibration caused when the cushy mounts were not equally weighted. Like a four legged table not resting level on the floor the engine will be very sensitive to any slight imperfection in the drive system or other imbalance and rock back and forth against the lightly loaded mounts.

On a trial-run doing engine checks I found an engine mount bottom jacking nut had worked its way down and the engine was busy rocking away. I retightened the nut and as the engine pushed against all four mounts again the vibration receded. Found something similar on a different trial-run.

Careful attention to not only alignment but weight balance on the mounts is important. Some of the mounts have built in indicators to estimate the pressure on them. "Barry" mounts calls that a "snubber gap" per the attached pdf.
Attached Files
File Type: pdf Barry engine mounts install details.pdf (66.2 KB, 13 views)
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