21790129 Upper Gear | Genuine Volvo Penta Part

🔧 Product Description

Upper-gear component for the assigned Volvo Penta propulsion drive. Ratio, clutch arrangement and serial-specific internal design must match the drive identification.

🚤 Compatibility

Typically suits:

• Volvo Penta D11A-C MP
• Volvo Penta IPS2-A

• Engine Family: D, IPS
• Serial Range: SN3950004698-

⚙️ Key Features

• Drive-specific gear and clutch geometry
• Transfers torque into the vertical drive train
• Requires controlled shimming and preload
• Designed for the specified drive oil
• Serial and ratio confirmation required
• Also supersedes Volvo part numbers 3801579 and 40005347

🔌 Function

Receives engine torque and transfers it through the upper gear and clutch into the drive train.

⚠️ Common Signs of Failure

• Gear or bearing noise
• Metal debris in drive oil
• Delayed or harsh engagement
• Excessive heat
• Loss of forward or reverse drive

🛠️ Service Notes

• The upper gear is part of a shimmed, matched assembly — record and keep the original shims as you strip it, and set gear backlash and bearing preload or rolling torque to the procedure and figures in the workshop manual for your drive
• Fit gears as a set; running a new pinion against an old, worn gear leads quickly to noise and a second failure
• Fit new seals, O-rings and lock rings whenever the housing is opened, and wash the housing out thoroughly so no metal from the old failure is left in it
• Inspect the driveshaft splines, universal joints and bearing carriers while you have the access, and read the drive oil you drained — water or metal in it tells you what actually failed
• Refill with the specified drive oil to the correct level, pressure- or vacuum-test the housing where the manual calls for it, and check for noise and for water in the oil after the first run

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21790129 → Supersedes 3801239

OEM / Related Numbers

• 3801659 earlier number superseded by this part
• 3801239 earlier number superseded by this part

📦 Condition

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