21306870 Disc Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta forward/reverse clutch disc pack for 150S and 150SR saildrive upper gear units. The set replaces earlier disc kit 3589686 and contains the alternating friction and steel discs required for both clutch packs. The drive must be dismantled and the correct shim and preload procedure followed during installation.

🚤 Compatibility

Typically suits:

• Volvo Penta D2-75F
• Volvo Penta D2-60F
• Volvo Penta 150S-D
• Volvo Penta 150SR-D
• Volvo Penta 150S-C
• Volvo Penta 150SR-C

• Engine Family: D
• HP Range: 60-75 HP
• Year Range: Approximately mid-2000s onward; verify upper gear-unit revision

⚙️ Key Features

• Genuine Volvo Penta OEM saildrive disc kit
• Correct current part number 21306870
• Supersedes earlier disc kit 3589686
• Eight friction discs and eight mating steel discs
• Yanmar SD60 cross-reference exists for the friction-disc design

📋 Kit Contents

• Friction disc - part number 3582579 - quantity 8
• Mating steel / plain disc - part number 3582578 - quantity 8

🔌 Function

The alternating friction and steel discs transmit engine torque when hydraulic/mechanical clutch pressure compresses the selected forward or reverse pack.

⚠️ Common Signs of Failure

• Saildrive slips under load
• Delayed or harsh gear engagement
• Burnt-smelling or dark transmission oil
• Friction material or metal found in the oil
• Disc pack installed without correct shimming or end clearance

🛠️ Service Notes

• Check the kit contents against the parts list for your unit before dismantling, and confirm it is the kit specified for your serial number
• Fit the discs as a complete set and discard the old ones — mixing new and used discs in one pack gives uneven loading and short life
• Keep the discs and their mating faces clean and free of grease and fingerprints, unless the manual specifically calls for them to be oiled or soaked before assembly
• Fit them in the order, orientation and stack sequence the manual gives, and inspect the faces they run against for scoring, heat marking and wear while access is open
• Set clearances and tighten to the workshop manual figures for your unit, then turn the assembly by hand to confirm free movement before running it up

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21306870 → Supersedes 3589686

OEM / Related Numbers

• 3589686 earlier number superseded by this part
• 3582579 friction disc
• 3582578 mating disc
• 3582577 related lock ring
• 3586556 related end disc
• 3582571 related thrust washer

Other-Brand OEM Numbers

• Yanmar: 196460-04290 cross-reference for the friction-disc design

Aftermarket / Verified Equivalents

• Marine transmission aftermarket: 3589686 clutch-disc set

📦 Condition

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