3860520 Gear Set | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gear set, part number 3860520, listed in the Marine Propulsion group. It transmits drive through the gearcase, taking engine torque and delivering it to the propeller shaft at the ratio and direction the drive is built for. Volvo Penta publishes no fitment, dimensions or assembly detail against this number, so check it against the parts list for your own engine before ordering.

⚙️ Key Features

• Genuine Volvo Penta gear set
• Marine Propulsion group
• Drive-transmitting component within the gearcase
• No fitment or dimensions published against this number — check it against the parts list for your engine

🔌 Function

Transmits drive through the gearcase, taking engine torque and delivering it to the propeller shaft at the ratio and direction the drive is built for.

⚠️ Common Signs of Failure

• A whine, growl or howl that rises and falls with load rather than simply with engine speed
• Knocking, clonking or vibration felt through the drive, especially on engagement or under acceleration
• Metal particles or bright flakes on the drain plug or suspended in the drive oil
• Oil that is milky, badly discoloured, or dropping in level
• Slipping under power, jumping out of engagement, or a drive that will not take load

🛠️ Service Notes

• Gear sets are supplied as a matched set and must be fitted complete — never run a new gear against a used mate, and keep the set together as it was delivered
• Setting up requires the shimming, backlash and tooth contact pattern checks in the workshop manual for your engine and drive, together with the proper measuring and pressing tools; this is not a fit-and-hope job
• Establish why the old set failed before assembly — debris, a collapsed bearing or oil starvation will destroy the new gears just as quickly
• Renew the bearings, seals and locking hardware at the same time, and flush the housing thoroughly so no metal debris is left in it
• Fill with the oil specified for your drive, then check the oil early in service for signs of abnormal bedding-in debris

📦 Condition

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