30-803097T1 Alpha One Gen I Transom Seal Kit · Fits MerCruiser R MR Alpha One Gen I select 1983–1990, Replaces 18-2601, 18-8213, 21950

30-803097T1 Alpha One Gen I Transom Seal Kit · Fits MerCruiser R MR Alpha One Gen I select 1983–1990, Replaces 18-2601, 18-8213, 21950

GHMarine Alpha One Gen I transom seal / repair kit — CSKU 23BK210 — for select MerCruiser R / MR / Alpha One Gen I sterndrives. Primary OEM 30-803097T1. Cross-refs 18-2601, 18-2601-1, 18-8213, 21950, 9-72902, 68397P. This is a full Gen I transom overhaul kit — not Gen II (30-803099T1) and not Bravo / Blackhawk (30-803100T1).

Sister CSKU 17B3005 also lists 30-803097T1 — match the CSKU / carton you stock (bearing / hose revisions can differ). Need Gen II kit → GH 17B3007 / 23BK211. Need Bravo kit → GH 18B5001 / 23BK209.

Which kit is this?

It is the Gen I transom seal service kit used when you pull the drive for a one-time bellows / bearing / gasket / hose refresh on listed R / MR / Alpha One Gen I packages. Confirm the old kit or EPC shows 30-803097T1 before you order.

It is not Alpha One Gen II kit 30-803099T1, not Bravo / Blackhawk kit 30-803100T1, not a single bellow sold alone, and not a Volvo / OMC kit.

Signs yours is due

• R / MR / Alpha One Gen I transom bellows, gasket, or gimbal bearing are due together and the chart calls for 30-803097T1 / 18-2601 / 18-8213.
• You almost ordered Gen II or Bravo because the listing only said "Alpha One" or "transom seal kit" — stop; confirm Gen I + 30-803097T1.
• You need only one rubber part — divert to the matching single CSKU instead of this full kit.
• Divert: Gen II → GH 17B3007 / 23BK211. Bravo → GH 18B5001 / 23BK209. Sister Gen I kit CSKU → GH 17B3005.

Will it fit my drive?

This kit is Compatible with select MerCruiser R / MR / Alpha One Gen I sterndrives about 1983–1990 that specify 30-803097T1. Representative serial band includes drive / transom 6225577+ when EPC confirms; Alpha One SS 1986–1989 / 0A545004+ only when EPC hits that individual. Alpha One Gen II and Bravo / Blackhawk are not this page. Confirm Gen I + serial — not HP or "Alpha One" badge alone.

*Representative bands. Final fit = OEM 30-803097T1 on EPC / old kit + Gen I / serial confirmation.

OEM & swap numbers

Primary OEM 30-803097T1. Cross-refs 18-2601, 18-2601-1, 18-8213, 21950, 9-72902, 68397P. Catalog core examples (verify carton — revisions exist): gimbal bearing 30-60794A4 (related 30-60794A2 — not two bearings in one box), U-joint bellow 60932A4, exhaust tube 78458A1 (or exhaust-bellow packaging variant), drive gasket 27-94996-2, O-ring 25-25439. Water hose may be 32-32461 (5/8") or 32-41725-33 (3/4") — not both by default.

Wrong part? Read before you order

• NOT Alpha Gen II kit 30-803099T1 (GH 17B3007 / 23BK211)
• NOT Bravo / Blackhawk kit 30-803100T1 (GH 18B5001 / 23BK209)
• NOT two gimbal bearings (A4 + A2) in one carton by default
• NOT both 5/8" and 3/4" water hoses by default
• NOT a single-bellow page if you need the full Gen I kit (or vice versa)

What ships in the box

• 1 × Alpha One Gen I transom seal / repair kit (30-803097T1 path)
• Typical catalog contents when your carton matches: gimbal bearing, U-joint bellow, exhaust tube or bellow variant, drive gasket, O-rings, water hose version as packed, clamps/hardware as packed
• Exact child OEM revisions follow the carton — count before you sell

Often ordered with related SKUs

• Sister Gen I kit CSKU → GH 17B3005
• Alpha Gen II kit → GH 17B3007 / 23BK211
• Bravo kit → GH 18B5001 / 23BK209
• 5/8" intake hose alone → GH 19H1001
• 3/4" intake hose alone → GH 19H1002 / 18H1003

Install tips on the Gen I transom kit

Full Alpha One Gen I transom overhaul. Cold engine; disconnect battery; support and remove the drive per the service manual.

1. Confirm OEM 30-803097T1 and Gen I identity (not Gen II / Bravo) before opening the kit.
2. Photograph orientation of each bellow, hose, bearing, and gasket; compare carton contents to your drive.
3. Remove the drive and replace kit items in the service-manual order for Gen I.
4. Use adhesives / expanders only where the Gen I service manual requires them for that bellow.
5. Reassemble, then check for water leaks before returning the boat to service.

FAQ

Is this Gen II?

No. 23BK210 is Alpha One Gen I 30-803097T1. Gen II is 30-803099T1.

Is 23BK210 the same as 17B3005?

Same primary kit OEM. This page is CSKU 23BK210 — match the CSKU / carton (child part revisions can differ).

Do I get both water hose sizes?

No. Carton usually follows one hose I.D. path (32-32461 or 32-41725-33) — confirm before shipping.

Do I get both 60794A4 and 60794A2 bearings?

No. They are version / legacy relations — not two bearings in one box by default.

"Alpha One" badge alone enough?

No. Confirm Gen I vs Gen II and OEM 30-803097T1 on serial / EPC.

I only need one bellow — buy this kit?

Usually no. Use the matching single CSKU unless you are doing a full Gen I transom refresh.

Please note

Aftermarket replacement by GHMarine. Not affiliated with engine manufacturers named above. "Compatible with", "Replaces", and cross-ref numbers identify the 30-803097T1 Alpha One Gen I transom seal kit family — always confirm OEM number, Gen I vs Gen II, serial/EPC, CSKU, and carton contents before ordering.