3861639 Lower Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lower gear for the 1.68:1 ratio, from the Marine Propulsion group, weighing 84 kg and listed for 1 application in the DP series. It supersedes part number 3803581, which was catalogued earlier as a remanufactured lower gear, so the remanufactured unit is now covered by this number. Upper gear 3861640 is its counterpart in the same drive.

🚤 Compatibility

Typically suits:

• Volvo Penta DP-G

• Engine Family: DP

⚙️ Key Features

• 1.68:1 ratio
• 84 kg
• 1 application in the DP series
• Supersedes 3803581, catalogued earlier as a remanufactured lower gear

🔌 Function

Carries the drive down through the leg to the propeller shafts at the 1.68:1 reduction.

⚠️ Common Signs of Failure

• Whine or howl from the leg that changes with load
• Clunk or hesitation when engaging forward or reverse
• Water in the drained drive oil, or oil turned grey and creamy
• Metal glitter or flakes on the drain plug magnet
• Play felt at the propeller shaft, or the shaft running out of true

🛠️ Service Notes

• Confirm the 1.68:1 ratio before ordering, as gear ratios are not interchangeable
• At 84 kg this is a freight item and needs lifting equipment, so plan handling and delivery access before ordering
• Renew seals and drive oil with the gear, and check upper gear 3861640 at the same time

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3861639 → Supersedes 3803581

OEM / Related Numbers

• 3803581 earlier number superseded by this part

📦 Condition

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