Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser upper gearcase vertical drive shaft

Mercruiser Outdrive Upper Gear Housing Shaft

  • GLM 11130 replaces Mercury 45-55796 and Sierra 18-2179
  • 4-1/2" in length, with an O.D. of 1.18" in the center of part
  • Installed in order to hold driven gear and bearing in place
  • Compatible with upper stern drive models 1968 - 1990, including Alpha 1 Gen 1

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11130 Drive Shaft Upper 45-55796

11130 Drive Shaft Upper 45-55796

GLM P/N 11130 Vertical Drive Shaft OEM 45-55796 $92.15

Help With Replacing This Part

When replacing this part, because you'll need to remove and replace the top bearing (31-61100A1) - you'll need to re-shim this part. It is recommended to purchase a new shim kit and seal kit when performing this job (these can be purchased below). Begin by removing the top bearing and gears off.

 

After pressing the bearing onto the new part, install a new o-ring so it sits right against the underside of the bearing. Use a sealing compound on this o-ring. You'll need an arbor press or similar tool to press the shaft into the driven gear until it seats properly into the collar section of the gear. Turn it over, and press the other bearing onto the driven gear. Next, install the new shims under the driven gear bearing race, and also the top cap bearing.

When shimming, the torque value of this part (using a torque tool set to in-lbs) should be 2 to 6 in-lbs. If the reading is over 6, remove some shims; and if it is below 2 add shims.

Customers who ordered P/N 11130 also purchased:

87500 Seal Kit Mercury 26-32511A1
87500 Seal Kit Mercury 26-32511A1

Seal kit 87500. All kits include o-rings, oil seals and gaskets in the upper housing. Remember to use a gasket sealing compound. Replaces OEM 26-32511A1, Sierra 18-2648.

21510 Vertical Bearing Part 31-61100A1
21510 Vertical Bearing Part 31-61100A1

Top cap cover bearing 21510 when installed sits underneath the top cover / cap. The bearing measures 1-15/16", and is compatible with models from 1971-1995 (s/n 3213658-OF679999). If you do not have your serial number, please measure to O.D. of your bearing. If it measures 1-25/32", using part 21511 or 31-32575T1. Replaces OEM 31-61100A1, Sierra 18-1165.

23270 OEM 15-36178A1
23270 OEM 15-36178A1

Shim kit 23260 installed under the top cap. Replaces OEM 15-45691A1.

15-36178A1
15-36178A1

Shim kit 23270 Installed under driven gear. Replaces OEM 15-36178A1.