21158901 Reversing Gear Kit | Genuine Volvo Penta Part

🔧 Product Description

A complete Volvo Penta hydraulic marine reversing-gear assembly with a nominal reduction ratio of 1.93:1. The ratio-specific gear train is supplied with the HS25 clutch, piston, shaft and bearing system as one factory package.

🚤 Compatibility

Typically suits:

• Volvo Penta D3-110I-C
• Volvo Penta D3-130I-C
• Volvo Penta D2-55F
• Volvo Penta D2-50F
• Volvo Penta D2-75F
• Volvo Penta D2-60F
• Volvo Penta D3-110I-G
• Volvo Penta D3-110I-H
• Volvo Penta D3-160I-C
• Volvo Penta HS25A
• Volvo Penta HS25A-B
• Volvo Penta HS25

• Engine Family: D, HS
• HP Range: 50-160 HP
• Year Range: Approximately 2000-2011

⚙️ Key Features

• Complete HS25 reversing gear with 1.93:1 reduction ratio
• Hydraulically operated multi-disc forward and reverse clutches
• Used with HS25A-B and HS25A-C transmission installations
• Includes the principal internal shaft, piston, spring, disc and bearing components
• Propeller selection and engine installation must match the exact ratio
• Engine type: Hydraulic marine reversing gear with multi-disc clutch packs

📋 Kit Contents

• 1 x input shaft 3584037 - supersedes earlier 3582208
• 1 x internal shaft 3582211
• 2 x balls 3582112
• 2 x rings 3582108
• 2 x clutch pistons 3582106
• 2 x rings 3582110
• 6 x clutch springs 3582114
• 1 x retaining / lock ring 3582118
• 1 x ring 3582117
• 8 x friction or clutch discs 3582100
• 6 x steel discs 3582098
• 2 x end discs 3582104
• 2 x snap rings 3582102
• 1 x key 3582089
• 2 x needle bearings 3582077
• Additional ratio-specific gears and factory-assembled internal components are supplied under the complete reversing-gear kit number and are not all available as separately itemised service parts

🔌 Function

Transfers engine torque to the propeller shaft, provides hydraulic forward and reverse engagement and reduces output speed by the stated ratio.

⚠️ Common Signs of Failure

• Forward or reverse engagement is delayed or slips
• Transmission pressure is below specification
• Metal or friction material is present in the oil
• Abnormal bearing or gear noise develops
• Incorrect reduction ratio causes propeller or engine-load problems

🛠️ Service Notes

• Work clean and dry — the reversing gear circulates its oil through everything in this kit, so grit introduced during assembly ends up in the gears and bearings
• Fit the new seals, gaskets and locking parts supplied with the kit and discard the corresponding old ones, including any that still look serviceable
• Inspect the flexible coupling, shift linkage, control cable and mountings while the gear is accessible; worn ones will undo the benefit of the new parts
• Refill with the oil grade and quantity specified for your reversing gear, then recheck the level after a short run once the new parts have taken up oil
• Confirm the gear engages fully and cleanly in both ahead and astern and returns properly to neutral before the boat is used

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21158901 → Supersedes 3807641

OEM / Related Numbers

• 3807641 earlier number superseded by this part
• 3584037 input shaft
• 3582208 earlier input-shaft reference
• 3582211 internal shaft
• 3582106 clutch piston
• 3582114 clutch spring
• 3582100 friction / clutch disc
• 3582098 steel clutch disc
• 3582104 end disc
• 3582077 needle bearing

📦 Condition

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