Alpha One Gen 2, Drive Shaft Seal Part Number Question

[crzy2bealive]

All,

My Outdrive Serial Number is 0D571098

I am trying to swap out part #5 on the list.

I ordered part number 864319 since my serial number ends with 571098.

• This seal number is used on drives with serial numbers: [0M400412] & Up

But what came out of the upper drive is 2 of part number 66302

• This seal number is used on drives with serial number ([0M400411] & Below)

Is there a service bulletin where Mercruiser changed from having 2 seals back to back to just 1 double - seal?

Maybe the shop that did this before did not pay attention to my serial number and should have been using 864319.

https://www.perfprotech.com/mercury...model/24554328179843/schematic/24554341876500

MerCruiser Parts | MerCruiser Engines | SternDrives | Diagrams | PerfProTech.com

Since 2002 Buy MerCruiser Parts Fast: Shop Online using Technical Diagrams for Alpha and Bravo Sterndrives and MerCruiser Engines. A+ BBB Rating means honest MerCruiser Technical Product support with your business to find parts near you.

www.perfprotech.com

 

[crzy2bealive]

Part number 864319 has a metal spring on both sides.

 

[crzy2bealive]

The old part number has a spring only on one side and they were installed back to back

 

[monkeyswrench]

If they have the same OD, and the shaft carries the same PN for both early and late, I'd run it. Making a seal that is a double lessens the chance of them being put in the wrong direction as well as damaging them.
As a warning though, I don't have a lot of Merc experience, but driven a lot of seals.

 

[LuckyStrike]

All,

My Outdrive Serial Number is 0D571098

I am trying to swap out part #5 on the list.

I ordered part number 864319 since my serial number ends with 571098.

• This seal number is used on drives with serial numbers: [0M400412] & Up

But what came out of the upper drive is 2 of part number 66302

• This seal number is used on drives with serial number ([0M400411] & Below)

Is there a service bulletin where Mercruiser changed from having 2 seals back to back to just 1 double - seal?

Maybe the shop that did this before did not pay attention to my serial number and should have been using 864319.

https://www.perfprotech.com/mercury...model/24554328179843/schematic/24554341876500


View attachment 1486888

MerCruiser Parts | MerCruiser Engines | SternDrives | Diagrams | PerfProTech.com

Since 2002 Buy MerCruiser Parts Fast: Shop Online using Technical Diagrams for Alpha and Bravo Sterndrives and MerCruiser Engines. A+ BBB Rating means honest MerCruiser Technical Product support with your business to find parts near you.

www.perfprotech.com

PM Paul Outdriveone

 

[Fun Times]

The old part number has a spring only on one side and they were installed back to back

View attachment 1486901

Because your serial number starts with 0D and both are still listed separately and not superseded into each other, you ought to use the 0M and under as yours is lower/older than the 0M serial number range… 0D/your serial number is from 1991 while 0M started around 2002ish.. it’s more so the lettering system that matters vs the numbering system in this case.

I can’t recall a bulletin saying to use the new designed seal so to be safe you’d be better off ordering 2 of (the 0M and under)

5 New number 8M0214939 old number 66302----SEAL Oil.

https://www.mercruiserparts.com/bam/subassemblydetail/46032797/28179843

https://www.marineengine.com/parts/mercury_marine_parts/sn/0D571098/6010000DS/1017_60

DRIVE SHAFT HOUSING AND DRIVE GEARS - 1991 Stern Drive ALPHA [TRANSOM] 6010000DS | Crowley Marine

View parts diagrams and shop online for DRIVE SHAFT HOUSING AND DRIVE GEARS parts, 1991 Stern Drive ALPHA [TRANSOM] 6010000DS. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

 

[Lumpy]

All,

My Outdrive Serial Number is 0D571098

I am trying to swap out part #5 on the list.

I ordered part number 864319 since my serial number ends with 571098.

• This seal number is used on drives with serial numbers: [0M400412] & Up

But what came out of the upper drive is 2 of part number 66302

• This seal number is used on drives with serial number ([0M400411] & Below)

Is there a service bulletin where Mercruiser changed from having 2 seals back to back to just 1 double - seal?

Maybe the shop that did this before did not pay attention to my serial number and should have been using 864319.

https://www.perfprotech.com/mercury...model/24554328179843/schematic/24554341876500


View attachment 1486888

MerCruiser Parts | MerCruiser Engines | SternDrives | Diagrams | PerfProTech.com

Since 2002 Buy MerCruiser Parts Fast: Shop Online using Technical Diagrams for Alpha and Bravo Sterndrives and MerCruiser Engines. A+ BBB Rating means honest MerCruiser Technical Product support with your business to find parts near you.

www.perfprotech.com

I wouldn't get too worried about this…assuming you have your drive numbers correct I would go with the correct double seal. The last shop probably used what they had or ordered the early style kit with the two seals by mistake. Been a long time since Ive been into and Alpha but if memory serves there isn't much a diff between the One and One Two.
Happy Boating!

 

[crzy2bealive]

Because your serial number starts with 0D and both are still listed separately and not superseded into each other, you ought to use the 0M and under as yours is lower/older than the 0M serial number range… 0D/your serial number is from 1991 while 0M started around 2002ish.. it’s more so the lettering system that matters vs the numbering system in this case.

I can’t recall a bulletin saying to use the new designed seal so to be safe you’d be better off ordering 2 of (the 0M and under)

5 New number 8M0214939 old number 66302----SEAL Oil.

https://www.mercruiserparts.com/bam/subassemblydetail/46032797/28179843

https://www.marineengine.com/parts/mercury_marine_parts/sn/0D571098/6010000DS/1017_60

DRIVE SHAFT HOUSING AND DRIVE GEARS - 1991 Stern Drive ALPHA [TRANSOM] 6010000DS | Crowley Marine

View parts diagrams and shop online for DRIVE SHAFT HOUSING AND DRIVE GEARS parts, 1991 Stern Drive ALPHA [TRANSOM] 6010000DS. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

Thanks for the clarification!

I'm going to order u-joints as well so I'll get free shipping.