4 Inch Upper Exhaust Pipe Bellows 32-44348001 32-44348 18-2748 89120 for MerCruiser V6 V8 Alpha One Bravo 1987-1998 — Australia Local Warehouse
4 Inch Upper Exhaust Pipe Bellows 32-44348001 32-44348 18-2748 89120 for MerCruiser V6 V8 Alpha One Bravo 1987-1998 — Australia Local Warehouse
Product Overview
Upper exhaust pipe bellows part for MerCruiser V6 and V8 sterndrives, 4 inch (101.6 mm) diameter, replacing 32-44348001, 32-44348 and 32-44348T and crossing to Sierra 18-2748, Mallory 9-72805 and GLM 89120. It arrives as 1 x bellows with 2 x stainless clamps, 481.5 g net, and covers the 1987 to 1998 Alpha One and Bravo models listed below. Shipped from our Australia local warehouse.
This is the top joint on the exhaust side. It joins the exhaust pipe to the transom plate at the top of the gimbal housing, and its only job is to carry exhaust gas out through the leg without letting it into the engine bay. When it splits the exhaust note changes first, then the smell arrives, and on a boat with the engine under a sealed hatch that smell is carbon monoxide.
These are MerCruiser sterndrives, the sterndrive line built by Mercury Marine, and buying by engine family is not enough on these boats. MerCruiser changed the exhaust pipe inside the same model name, so the serial number range in the table below is the only reliable check on anything built before 1998.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Upper exhaust pipe bellows |
| Diameter | 4 inch (101.6 mm) |
| Net Weight | 481.5 g |
| Material | Marine grade rubber |
| Clamps Included | 2 x stainless steel |
| Fits | MerCruiser V6 and V8 sterndrives, Alpha One and Bravo |
| Years | 1987 to 1998 on the models listed |
OEM Cross Reference
| Brand | Part Numbers |
|---|---|
| MerCruiser | 32-44348001, 32-44348, 32-44348T |
| Sierra | 18-2748 |
| Mallory | 9-72805 |
| GLM | 89120 |
Compatible Engines
| Engine Model | Power Designation | Years | Serial Number Range |
|---|---|---|---|
| 260 GM | 260 HP | 1987 | 0B525982 thru 0B773304 |
| 230 4 BBL GM | 230 HP | 1987 | 0B525982 thru 0B773739 |
| 200 2 BBL GM | 200 HP | 1987 | 0B525982 thru 0B774444 |
| 350 MAG Alpha GM | 350 HP | 1987 to 1995 | 0B525982 thru 0F600999 |
| 5.7 L GM | 260 HP | 1988 to 1995 | 0B525982 thru 0F600999 |
| 7.4 L Bravo GM 454 | 330 HP | 1988 to 1991 | 0B771113 thru 0D603117 |
| 5.0 LX 4 BBL GM | 230 HP | 1988 to 1995 | 0B773740 thru 0F600999 |
| 5.0 L 2 BBL GM | 200 HP | 1988 to 1995 | 0B774445 thru 0F600999 |
| 350 MAG Ski GM | 350 HP | 1991 to 1996 | 0D505450 thru 0K040399 |
| D4.2 L 220 IDI VM 254 | 220 HP | 1994 to 1998 | 0D554732 thru 0M999999 |
| 7.4 L Bravo Gen V GM | 330 HP | 1992 to 1996 | 0D603118 thru 0F800699 |
| 4.3 L Gen II 2 BBL GM | 200 HP | 1992 to 1993 | 0D714107 thru 0F000877 |
| 4.3 LX Gen II 4 BBL GM | 205 HP | 1992 to 1993 | 0D714370 thru 0F001219 |
| 454 MAG Bravo Gen V GM | 330 HP | 1992 to 1993 | 0D805069 thru 0F304999 |
The model number is the horsepower on most of these engines, so the 260 GM is the 260 HP V8, the 350 MAG is the 350 HP engine, and the 200 and 230 are the small block versions of the same exhaust layout.
What's Included
| Component | Detail | Qty |
|---|---|---|
| Upper exhaust pipe bellows | 4 inch (101.6 mm), 32-44348001 | 1 |
| Stainless steel clamp | Worm drive, for the transom plate and the pipe | 2 |
Upper Bellows or Lower Bellows
| What You Are Looking At | Which Part | How To Tell It Apart |
|---|---|---|
| Joint at the top of the gimbal housing | Upper exhaust bellows, this part | Round, 4 inch (101.6 mm), exhaust only, no shaft through it |
| Joint at the bottom of the gimbal housing | U-joint bellows, not this part | Larger, the drive shaft runs through it, sits behind the gimbal bearing |
| Thin corrugated tube alongside the drive | Shift cable bellows | Long and narrow, follows the shift cable |
| Small hose on the same transom plate | Water passage hose | Much smaller diameter, carries raw water up to the engine |
| Exhaust pipe itself, above the bellows | Steel pipe, not this part | Rigid metal, only the rubber joint is in this kit |
Exhaust Smell and Carbon Monoxide
| What You Notice | What It Usually Means | What To Do |
|---|---|---|
| Exhaust smell in the engine bay at idle | Clamp off its seat or the bellows has split | Stop and inspect before the next trip |
| Headache or drowsiness after a slow run | Exhaust gas reaching the cockpit, carbon monoxide | Open up the bay, find the leak and fix it before going out again |
| Exhaust note louder than last season | Split bellows or a missing clamp | Renew the bellows and both clamps together |
| Black soot around the top clamp | Gas escaping past the joint | Reseat on a clean flange with a new clamp |
| Steam in the engine bay | Exhaust leak plus hot cooling water | Inspect the bellows and the water hose at the same time |
| Nothing visible but the smell is there | Hairline split under the ribs | Take the bellows off and flex it in your hands |
Salt Water, Heat and Rubber Age
| Australian Use | Effect on the Bellows | What To Do |
|---|---|---|
| Salt water drying on the rubber | Surface hardens and the ribs crack first | Fresh water rinse after every trip |
| 35 °C days under a closed hatch | Rubber ages faster above 30 °C | Inspect the ribs each season, not each decade |
| Long lay up in the open | UV and heat crack the outer skin | Cover the boat or expect a shorter life |
| Ramp launches and retrievals | Constant flexing at the same two ribs | Check the ribs for splits before the season |
| Salt left on the clamps | Crevice corrosion under the stainless | Renew the clamps with the bellows |
| Engine bay washed with a hose | Water sits against the lower rib | Dry the bay after washing |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Measure the old bellows across the body, 4 inch (101.6 mm) is this part, the U-joint bellows is larger |
| 2 | Check the engine serial number against the table above, the 1987 engines used a shorter pipe |
| 3 | Clean the transom plate flange back to bare metal, a pitted flange tears a new bellows |
| 4 | Fit the bellows before the gimbal bearing and alignment work, that order saves doing the job twice |
| 5 | Seat the ribs in the groove on both ends before tightening anything |
| 6 | Tighten the clamps with the screw on the side, a clamp on the flat of the rib will not seal |
| 7 | Check the water hose and shift cable bellows while the drive is off |
| 8 | Run the engine on muffs and check the bay for exhaust smell before the first trip |
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 |
| Pacific islands | Australia local warehouse | Tracked shipping available |
Before You Buy
- Measure the old bellows, this is the 4 inch (101.6 mm) upper exhaust bellows, not the U-joint bellows
- Check the engine serial number against the 14 model ranges in the table
- Check the transom plate flange for corrosion before ordering
- Renew both clamps with the bellows, the old ones usually come off bent
- If the exhaust smell is already in the engine bay, stop using the boat until it is fixed
- This is the bellows and 2 clamps, the exhaust pipe, gimbal bearing and water hose are not included
- 30-Day Easy Returns
- Ships from our Australia local warehouse
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