Sierra's 18-9855 Drive Gear Shimming Tool measures the upper drive gear clearance on drive units. It is designed for use with Mercruiser MC-I, R-MR, Alpha I, and Alpha I Gen II drive units. Includes one drive gear shimming tool per package. It is interchangeable with GLM 90170 and Mercury Marine 91-60523. Each Sierra product meets or exceeds the original equipment part it replaces. Fit specific, check part numbers to ensure proper fit.
Measures the upper drive gear clearance on drive units
Designed for use with Mercruiser MC-I, R-MR, Alpha I, and Alpha I Gen II drive units
Includes one drive gear shimming tool per package
Interchangeable with GLM 90170 and Mercury Marine 91-60523
Fit specific, check part numbers to ensure proper fit