Transom Bellows Kit with Gimbal Bearing 30-803099T1 for Mercruiser Alpha One Gen 2 Sterndrive 18-8206-1 — Australia Local Warehouse
Transom Bellows Kit with Gimbal Bearing 30-803099T1 for Mercruiser Alpha One Gen 2 Sterndrive 18-8206-1 — Australia Local Warehouse
Product Overview
Transom bellows kit with gimbal bearing for Mercury MerCruiser Alpha One Gen 2 sterndrives from 1991 onwards, packed in a 30.5 x 19.5 x 17.5 cm box. The kit replaces 30-803099T1, Sierra 18-8206-1 and 18-8218, GLM 21960 and Mallory 9-72904. It contains the U-joint bellows, exhaust bellows, shift cable bellows, gimbal bearing, water intake hose and gasket set, with the clamps and rings needed to refit the drive. Dispatched from our Australia local warehouse.
The bellows are three rubber sleeves that seal the openings between the transom shield and the drive. Two of them carry the exhaust and the water intake, and the third protects the universal joint and the gimbal bearing. They sit permanently below the water line on a moored boat, flex every time the drive is trimmed, and perish from ozone on the outside while staying wet on the inside.
On an Alpha One Gen 2, a split U-joint bellows does not announce itself. Water enters quietly, the gimbal bearing loses its grease, and the first real symptom is usually a rumble through the transom when the helm is turned, or water in the bilge that cannot be traced. By then the bearing and the yoke are both suspect, which is why this kit includes a bearing rather than just the rubber.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Transom bellows kit with gimbal bearing |
| Engine / Drive | Mercury MerCruiser Alpha One Gen 2 |
| Years | 1991 and newer |
| Contents | 3 bellows, gimbal bearing, intake hose, gasket set |
| Packaging Size | 30.5 x 19.5 x 17.5 cm (12.0 x 7.7 x 6.9 in) |
| Quantity | 1 complete kit |
| Country of Origin | Taiwan |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| MerCruiser | 30-803099T1 |
| Sierra | 18-8206, 18-8206-1, 18-8218 |
| GLM | 21960 |
| Mallory | 9-72904, 72900 |
Compatible Engines
| Drive | Years | Note |
|---|---|---|
| Alpha One Gen 2 | 1991 and newer | All ratios |
| Alpha One Gen 2 | All years of this drive | Gimbal bearing included |
| MerCruiser sterndrive | Check the drive plate | Confirm Gen 2 before ordering |
What's Included
| Component | Qty |
|---|---|
| U-joint bellows | 1 |
| Exhaust bellows | 1 |
| Shift cable bellows | 1 |
| Gimbal bearing | 1 |
| Water intake hose | 1 |
| Outdrive gasket set | 1 |
| Clamps and bellows ring | 1 set |
Signs the Bellows Have Failed
| Symptom | What It Points To |
|---|---|
| Rumble through the transom when turning | Gimbal bearing running in water |
| Water in the bilge after a run | U-joint bellows split at a fold |
| Grease washed out of the gimbal housing | Bellows leaking at the clamp |
| Exhaust noise under the engine cover | Exhaust bellows torn |
| Gear oil level rising or milky | Not the bellows, check the yoke seal too |
| Cracks visible when the drive is tilted up | Perished rubber, change before it splits |
Gimbal Bearing Notes
| Item | Detail |
|---|---|
| Bearing type | Sealed roller bearing in the gimbal housing |
| Lubrication | Grease after fitting, then at every service |
| Alignment | Check engine alignment before refitting the drive |
| Wear sign | Rumble, roughness or play at the yoke |
| Do not reuse | A bearing that has seen water is not worth keeping |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Support the drive and remove it from the transom assembly |
| 2 | Slide the U-joint yoke out and inspect it for water marks |
| 3 | Cut the old clamps and pull the three bellows clear |
| 4 | Clean the bellows seats on both flanges |
| 5 | Pull the old gimbal bearing with a slide hammer |
| 6 | Drive the new bearing in square, then grease it |
| 7 | Fit the bellows with new clamps, seated in the groove |
| 8 | Check engine alignment and refit the drive |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Shipping from Australia
| Destination | Warehouse | Note |
|---|---|---|
| Australia | Australia local warehouse | Domestic delivery, no import duty |
| New Zealand | Australia local warehouse | Short transit, customs may apply |
| Asia Pacific | Australia local warehouse | Tracked air and sea options |
Before You Buy
- Confirm the drive is an Alpha One Gen 2, the Gen 1 kit is different
- Check the gimbal housing flange for corrosion while the drive is off
- Check engine alignment before the drive goes back on
- Grease the gimbal bearing after fitting, it arrives dry
- Order the shift cable bellows only if yours is separate, this kit includes it
- This is the kit only, the drive and the transom assembly are not included
- 30-Day Easy Returns
- Ships from our Australia local warehouse
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