Sierra 18-8206-1 is a complete bellows and transom seal kit for MerCruiser Alpha One Gen II stern drives from 1991 to present with serial number 0D469859 and up. It crosses to MerCruiser kit 30-803099T1 and comes with a greasable gimbal bearing.
The kit covers the parts that come apart when the drive is off: drive, exhaust and shift cable bellows, the gimbal bearing, a bellows clamp, bell housing and outdrive mounting gaskets, O-rings, hose clamps and the water intake hose. Follow your MerCruiser service manual for bellows adhesive, sealants and torque.
Check the serial number on your drive before you order. Sierra 18-8218 is the same application with a sealed gimbal bearing.
Fits / Replaces
FitsMerCruiser Alpha One Gen II stern drives1991 to presentserial 0D469859 and up
Replaces part numbersMerCruiser 30-803099T1
InterchangeEMP 61-08399, Mallory 9-72904
Specifications
Package size14 in x 6 in x 11.25 in
Shipping weight4.55
Specifications
Drive: MerCruiser Alpha One Gen II
Model Years: 1991 to present
Serial Number Range: 0D469859 and up
Gimbal Bearing: Greasable (Sierra 18-21005)
Kit Type: Bellows and transom seal kit
Includes
1 x Drive bellows, Sierra 18-2747
1 x Exhaust bellows, Sierra 18-2750
1 x Shift cable bellows, Sierra 18-2753-2
1 x Gimbal bearing, greasable, Sierra 18-21005
1 x Bellows clamp, Sierra 18-7321
1 x Bell housing gasket, Sierra 18-2840
1 x Outdrive mounting gasket, Sierra 18-2743
2 x O-ring, Sierra 18-7153
1 x O-ring, Sierra 18-7170
1 x O-ring, Sierra 18-7117
1 x Hose clamp, 1-1/16 to 2 in, Sierra 18-710-24-2
2 x Hose clamp, 11/16 to 1-1/2 in, Sierra 18-710-16-2
1 x Water intake hose, Sierra 18-3602
Features
Greasable gimbal bearing included (Sierra 18-21005)
Complete transom seal kit: bellows, bellows clamp, gaskets, O-rings, hose clamps and water intake hose
Does the Sierra 18-8206-1 fit my MerCruiser drive?
It is listed for MerCruiser Alpha One Gen II stern drives from 1991 to present with serial number 0D469859 and up. Drives below that serial number are not covered by this listing, so check your serial number before you order.
What is the difference between Sierra 18-8206-1 and 18-8218?
Same application, and both cross to MerCruiser 30-803099T1. 18-8206-1 comes with a greasable gimbal bearing (Sierra 18-21005) and a bellows clamp. 18-8218 comes with a sealed gimbal bearing (Sierra 18-21006).
Which part numbers does it replace?
MerCruiser 30-803099T1. It also crosses to EMP 61-08399 and Mallory 9-72904.
What else do I need for the job?
Bellows adhesive for the bellows flanges (we carry Sierra 18-9031-1), plus the sealants, lubricants and torque values in your MerCruiser service manual. With the drive off, it is a good time to check the U-joints and engine alignment.