21203504 Rubber Cushion | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta rubber cushion used at the front engine mounting points on D6 marine diesel installations. The bonded rubber element supports engine weight, isolates vibration and maintains driveline alignment when installed with the correct brackets and fasteners.

🚤 Compatibility

• Engine Family: D
• HP Range: 145-480 HP

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta D6 engine-mount cushion
• Confirmed D6-280A-A application with broader D6 mount use
• Bonded rubber vibration isolator
• Supports engine alignment and absorbs torsional movement
• D4 installations commonly use a different cushion and must not be assumed compatible
• Engine type: Volvo Penta D6 inline-six common-rail marine diesel

🔌 Function

Supports the engine while isolating vibration and maintaining alignment with the drive or transmission.

⚠️ Common Signs of Failure

• Rubber cracking, separation or permanent compression
• Engine vibration increasing at idle or under load
• Engine sitting low or driveline alignment changing
• Oil or fuel contamination softening the rubber
• Loose mounting studs or metal-to-metal contact

🛠️ Service Notes

• Keep oil, fuel and solvents off the rubber during and after fitting; contamination softens and swells the rubber and destroys the isolation it is there to provide
• Tighten only enough to hold the part square and secure — a cushion has to stay slightly compressed to isolate vibration, and crushing it makes the mounting solid
• Where several cushions support one component, renew them as a set so the load shares evenly; a single new cushion alongside aged ones carries more than its share
• Check the bracket, spacer, washers and fasteners at the same time — a cushion that has failed early usually points to a loose fastener, a missing spacer or corrosion in the mounting
• Renew aged cushions whenever the component they support is disturbed; old rubber takes a permanent set and will not recover

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 3583516 - earlier engine-bracket references
• 3807719 - earlier engine-bracket references
• 847766 - lock washer
• 955786 - mounting nuts
• 990973 - mounting nuts
• 3594127 - associated nut
• 21487639 - later D6 bracket references
• 23136596 - later D6 bracket references
• 23408196 - later D6 bracket references
• 1678297 - spacer

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G, D6-480A-G
• Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G