Sikboats
Cadet
- Joined
- Apr 7, 2010
- Messages
- 19
7.4 mpi , customer drove with no oil pres because of blown oil line. fixed line and told him It prob will not live. Went to lake and had vibration at 2500-3000... told him it was probaly main bearings which it was they were burt up. Replaced motor and still have vibration, motor mounts tight and thru bolted alluminum 1/2 L angles. Removed drive and ran at shop and vibration still there but only at rpm's stated. When on dyno someone stated they saw coupler slight runout , it has the H/P coupler. Question has anyone ever heard of a coupler causing vibration before I pull the motor back out?