30-803100T1 Bravo Transom Seal Kit · Fits MerCruiser Bravo I/II/III and Blackhawk select, Replaces 8M0095485, 18-8212-1, 21961

30-803100T1 Bravo Transom Seal Kit · Fits MerCruiser Bravo I/II/III and Blackhawk select, Replaces 8M0095485, 18-8212-1, 21961

GHMarine Bravo / Blackhawk transom seal / repair kit — CSKU 23BK209 — for select MerCruiser Bravo I / II / III and Blackhawk sterndrives. Primary OEM 30-803100T1 (also listed as 8M0095485). Cross-refs 18-8212-1, 21961, 9-72903, 68396P. This is a full transom overhaul kit path — not Alpha Gen I (30-803097T1) and not Alpha Gen II (30-803099T1).

Sister CSKU 18B5001 also lists 30-803100T1 — match the CSKU / carton you stock (bearing and bellow revisions can differ by package). Need Alpha Gen I kit → GH 17B3005 / 23BK210. Need Alpha Gen II kit → GH 17B3007 / 23BK211. Need sealed-bearing Bravo variant 18-8219 → not an automatic swap on this page.

Which kit is this?

It is the Bravo / Blackhawk transom seal service kit used when you pull the drive for a one-time bellows / bearing / hose / mounting-seal refresh on listed Bravo packages. Confirm the old kit or EPC shows 30-803100T1 / 8M0095485 before you order.

It is not Alpha Gen I kit 30-803097T1, not Alpha Gen II kit 30-803099T1, not a single bellow sold alone, and not a Volvo / OMC sterndrive kit.

Signs yours is due

• Bravo / Blackhawk transom bellows, water hose, or gimbal bearing are due together and the chart calls for 30-803100T1 / 8M0095485 / 18-8212-1.
• You almost ordered Alpha Gen I or Gen II because the listing said "transom seal kit" — stop; Bravo is a different kit family.
• You need only one rubber part (U-joint / exhaust / shift) — divert to the matching single CSKU instead of this full kit.
• Divert: Alpha Gen I → GH 17B3005 / 23BK210. Alpha Gen II → GH 17B3007 / 23BK211. Sister Bravo kit CSKU → GH 18B5001.

Will it fit my drive?

This kit is Compatible with select MerCruiser Bravo I / II / III and Blackhawk sterndrives that specify 30-803100T1 or 8M0095485. Representative catalog bands include Bravo packages from about 1982+ and common Bravo I/II/III serials around 0B664190+; Blackhawk about 1994–95 / 0F186717+ when EPC confirms. Alpha R / MR / Gen I / Gen II is not this page. Confirm drive / transom serial — not HP alone.

*Representative catalog bands. Final fit = OEM 30-803100T1 / 8M0095485 on EPC / old kit + drive/transom serial.

OEM & swap numbers

Primary OEM 30-803100T1 / 8M0095485. Cross-refs 18-8212-1, 21961, 9-72903, 68396P. Catalog CONTAINS examples (verify against your carton — revisions exist): shift bellow 74639, gimbal bearing 30-862540A3, U-joint bellow 86840A3, exhaust bellow 32734A3 and/or exhaust tube 78458A1 (packaging variants), water hose 32-43437, mounting set 16755A1.

Wrong part? Read before you order

• NOT Alpha Gen I kit 30-803097T1 (GH 17B3005 / 23BK210)
• NOT Alpha Gen II kit 30-803099T1 (GH 17B3007 / 23BK211)
• NOT sealed-bearing Bravo variant 18-8219 without confirming the package
• NOT a single bellow / single hose page if you only need one part
• NOT "same family as Alpha Gen I" wording — 18B5001 / 23BK209 are Bravo

What ships in the box

• 1 × Bravo / Blackhawk transom seal / repair kit (30-803100T1 path)
• Typical catalog contents when your carton matches: shift bellow, gimbal bearing, U-joint bellow, exhaust bellow and/or exhaust tube, water hose, mounting set, clamps/hardware as packed
• Exact child OEM revisions (example: bearing 862540A3 vs 60794A4; exhaust 32734A3 vs 18654A1) follow the carton — count before you sell

Often ordered with related SKUs

• Sister Bravo kit CSKU → GH 18B5001
• Alpha Gen I kit → GH 17B3005 / 23BK210
• Alpha Gen II kit → GH 17B3007 / 23BK211
• Bravo Design I water hose alone → GH 18H1001
• Bravo U-joint bellow alone → GH 17B1006

Install tips on the Bravo transom kit

Full Bravo / Blackhawk transom overhaul. Cold engine; disconnect battery; support and remove the drive per the service manual. This is a multi-part kit — not a single-bellow hose-clamp job.

1. Confirm OEM 30-803100T1 / 8M0095485 and Bravo / Blackhawk identity (not Alpha) before opening the kit.
2. Photograph orientation of each bellow, hose, bearing, and clamp; compare carton contents to your drive.
3. Remove the drive and replace kit items in the service-manual order (bearing / U-joint / exhaust / shift / hose / mounting).
4. Use adhesives / expanders only where the Bravo service manual requires them for that bellow.
5. Reassemble, then check for water leaks and shift/exhaust integrity before returning the boat to service.

FAQ

Is this an Alpha Gen I or Gen II kit?

No. 23BK209 is Bravo / Blackhawk 30-803100T1. Alpha Gen I is 30-803097T1; Alpha Gen II is 30-803099T1.

Is 23BK209 the same as 18B5001?

Same primary kit OEM family. This page is CSKU 23BK209 — match the CSKU / carton (child part revisions can differ).

Does every carton include both 32734A3 and 78458A1?

Catalogs may list exhaust bellow and exhaust tube paths. Confirm what is physically in your carton — do not assume both always ship.

Is 18-8219 the same kit?

It is a sealed-bearing Bravo packaging variant risk. Do not auto-swap without confirming the package.

I only need the water hose or one bellow — buy this?

Usually no. Use the matching single CSKU (for example 18H1001 for Design I hose) unless you are doing a full transom refresh.

HP alone enough?

No. Confirm Bravo / Blackhawk + OEM 30-803100T1 / 8M0095485 on serial / EPC.

Please note

Aftermarket replacement by GHMarine. Not affiliated with engine manufacturers named above. "Compatible with", "Replaces", and cross-ref numbers identify the 30-803100T1 Bravo / Blackhawk transom seal kit family — always confirm OEM number, drive family (Bravo vs Alpha), serial/EPC, CSKU, and carton contents before ordering.