21902005 Gear Set | Genuine Volvo Penta Part

🔧 Product Description

Matched lower-unit gear set for Volvo Penta 290 DuoProp / DP-D1 / DP-E drives with 1.95:1 reduction. The set uses the matched 16-tooth pinion and 30-tooth driven gear profile; gears must remain together as a lapped/matched pair.

🚤 Compatibility

Typically suits:

• Volvo Penta DP-D1
• Volvo Penta DP-E
• Volvo Penta TAMD41P

• Engine Family: DP, TAMD

⚙️ Key Features

• Matched gear tooth profiles
• Specified reduction ratio
• Hardened marine gear surfaces
• Supplied as a matched set
• Drive model, ratio and serial must match

📋 Kit Contents

• 21902005 - matched 16-tooth pinion gear, supplied only as part of this set
• 21902005 - matched 30-tooth driven gear, supplied only as part of this set

🔌 Function

Transfers power through the lower gearcase at the specified 1.95:1 reduction while changing the drive direction to the propeller shafts.

⚠️ Common Signs of Failure

• Gear whine, rumble or knocking
• Pitted, spalled or broken gear teeth
• Water-contaminated oil leading to bearing and gear corrosion

🛠️ 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

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21902005 → Supersedes 3861457 → Supersedes 852174

OEM / Related Numbers

• 3861457 earlier number superseded by this part
• 852174 earlier number superseded by this part

📦 Condition

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