21116404 Reversing Gear | Genuine Volvo Penta Part

🔧 Product Description

Complete genuine Volvo Penta hydraulic marine reversing-gear assembly. Public parts data confirms the complete assembly number but does not safely establish the transmission model, reduction ratio or flange configuration. Those specifications must therefore be matched from the original transmission identification plate.

⚙️ Key Features

• Complete genuine Volvo Penta reversing gear
• Hydraulic forward, neutral and reverse operation
• Supplied as a configuration-specific transmission assembly
• Input, output flange and reduction ratio must match the vessel
• Suitable only where 21116404 is the specified complete gear number
• Also supersedes Volvo part number 3818585

🔌 Function

The reversing gear transfers engine torque to the propeller shaft and hydraulically selects forward, neutral or reverse.

⚠️ Common Signs of Failure

• Delayed engagement
• Slipping under load
• Burnt or metal-contaminated transmission oil
• Propeller shaft rotating while neutral is selected

🛠️ Service Notes

• Fill with the oil grade the workshop manual specifies for that gear before it is turned — units are supplied dry and a dry start will wreck the clutch and bearings; get the level right, as over-filling a cone clutch gear causes as much trouble as under-filling it
• Check engine-to-shaft alignment and the condition of the flexible coupling before the gear is bolted up; misalignment is the commonest reason a replacement gear fails again
• Set the shift cable or linkage so the lever reaches full travel and engages fully in both directions and returns cleanly to neutral — partial engagement burns a clutch quickly
• Change the oil after the initial running-in period and then at your scheduled interval, checking it for water and for metal every time
• Do not use the gear to hold the shaft while working on the propeller, and do not let the shaft turn under sail or tow unless the manual for your gear allows it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21116404 → Supersedes 3582030

OEM / Related Numbers

• 3812394 earlier number superseded by this part
• 3582030 earlier number superseded by this part

📦 Condition

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