3860241 Gear Under | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta under gear for the 1.68:1 ratio, from the Marine Propulsion group, weighing 23.133 kg and listed for one DPX application. The 1.68:1 ratio is what identifies it — the gear housings in this range are published for 1.59:1 (3860240) and 1.78:1 (3860242), so the ratio must be checked against the drive itself rather than assumed from the housing.

🚤 Compatibility

Typically suits:

• Volvo Penta DPX-A

• Engine Family: DPX

⚙️ Key Features

• For the 1.68:1 ratio
• 23.133 kg
• One published DPX application
• Ratio must match the drive — housings in this range are 1.59:1 and 1.78:1

🔌 Function

Forms the lower gear in the drive's reduction, meshing with its partner to set the 1.68:1 ratio between the input shaft and the propeller shaft.

⚠️ Common Signs of Failure

• Whine or growl under load, changing with the gear selected
• Teeth found pitted, spalled or with a broken corner
• Metal glitter or bright flakes on the drain plug magnet
• Backlash felt at the propeller shaft
• Water or milky oil found in the drive

🛠️ Service Notes

• Gears are matched to their partner and to a shim setting — renew as a set and shim the mesh to specification
• At 23 kg this needs proper support on the bench and in transit
• Establish why the old gear failed, as water ingress or wrong shimming will destroy the new one too

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging