Sierra 18-2358 Upper Unit Gear Repair Kit


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Frequently Bought Together

Sierra 18-2358 Mercruiser 1.5:1 Upper Unit Gear Repair Kit

Sierra Upper Unit Gear Repair Kit for Mercruiser Gen II applications s/n range up to 0K999999 only.

  • Ratios: 1.50:1 (1.47:1)
  • Teeth: 20-22

Interchangeable with:

  • GLM
    • 11216
  • Mercruiser Stern Drive
    • 43-803102T1


Mercruiser Stern Drive

  • Alpha One Gen II
    • 1991-1997
    • s/n 0D469859 thru 0K999999

Sierra Break-In Instructions for 18-2358 Mercruiser Upper Unit Gear Repair Kit

All gear sets require a break-in period. Instructions for 10 hour break-in period is as follows:

  • Avoid full throttle starts.
  • DO NOT operate at constant speeds for extended periods.
  • DO NOT exceed 75& of full throttle during the first 5 hours of operation. During the next 5 hours, full throttle operation is permissible for brief periods.
  • Shift into forward gear a minimum of 10 times during break-in, with moderate engine speed after each shift.

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