Sierra Lower Unit Seal Kit - SIE-18-2646-1

Sierra 18-2646-1 MerCruiser Alpha One Gen II Lower Unit Seal Kit

Used On All MerCruiser Alpha I Gen II Lower Units 1991-Up

Kit Includes:

Sie-18-2599 Face Seal And Tool

Sie-18-2564 Water Pump Base To Face Plate Gasket

Sie-18-2566 Face Plate To Water Pump Cover Gasket

Sie-18-2945 Sealing Washer

Sie-18-2944 Seal

Sie-18-2002 Oil Seal

Sie-18-2013 Oil Seal

Sie-18-2014 Oil Seal

Sie-18-2054 Oil Seal

Sie-18-2076 Oil Seal

Sie-18-2077 Oil Seal

Sie-18-7159 O-Ring

Sie-18-7168 O-Ring

Sie-18-7176 O-Ring

Sie-18-7420 O-Ring

Sie-18-7440-1 O-Ring

Sie-18-2056 Oil Seal

Sie-18-7413 O-Ring

Interchangeable With:

Mallory

9-74206

GLM

87511

MerCruiser Stern Drive

26-816575A1

26-816575A3

26-816575A1

Frequently Asked Questions

• What is the Sierra 18-2646-1 MerCruiser Alpha One Gen II Lower Unit Seal Kit used for? The Sierra 18-2646-1 MerCruiser Alpha One Gen II Lower Unit Seal Kit is used on all MerCruiser Alpha I Gen II lower units from 1991-up. The kit contains multiple oil seals, O-rings, gaskets, a sealing washer, a seal, and a face seal and tool.
• What MerCruiser lower units does the Sierra 18-2646-1 seal kit fit? The Sierra 18-2646-1 Lower Unit Seal Kit is listed for all MerCruiser Alpha I Gen II lower units from 1991-up. Verify that your lower unit is an Alpha I Gen II model and falls within the listed year range before purchasing.
• What is included in the Sierra 18-2646-1 MerCruiser lower unit seal kit? The kit includes the Sie-18-2599 Face Seal And Tool, Sie-18-2564 and Sie-18-2566 water pump gaskets, Sie-18-2945 sealing washer, Sie-18-2944 seal, six oil seals, and seven O-rings. The included components cover the seals and gaskets specifically listed in the product description.
• Does the Sierra 18-2646-1 seal kit include a face seal tool? Yes. The Sierra 18-2646-1 kit includes the Sie-18-2599 Face Seal And Tool. It also contains the Sie-18-2564 Water Pump Base To Face Plate Gasket and Sie-18-2566 Face Plate To Water Pump Cover Gasket.
• What part numbers are interchangeable with the Sierra 18-2646-1 lower unit seal kit? The Sierra 18-2646-1 MerCruiser Alpha One Gen II Lower Unit Seal Kit is interchangeable with Mallory 9-74206, GLM 87511, and MerCruiser Stern Drive 26-816575A1 and 26-816575A3. Verify your existing part number and lower-unit application before purchasing.