21389274 Gasket | Genuine Volvo Penta Part

🔧 Product Description

OEM starter-system sealing gasket used with specified Volvo Penta D4 and D6 marine engines. It forms part of the starter motor and electrical-terminal sealing arrangement and should be renewed whenever the relevant starter assembly is dismantled to protect the connection area from moisture, salt contamination and debris.

🚤 Compatibility

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

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta starter-system sealing gasket
• Used across specified D4 and D6 engine generations
• Supports both applicable 12V and 24V starter arrangements
• Helps protect starter electrical components from moisture and contamination
• Recommended replacement whenever the sealed joint is disturbed
• Engine type: Volvo Penta D4 inline four-cylinder and D6 inline six-cylinder marine diesel

🔌 Function

Seals the applicable starter-motor joint or terminal area to reduce moisture and contamination entry. A sound gasket helps protect the starter's electrical connection and internal components in a high-humidity marine engine compartment.

⚠️ Common Signs of Failure

• Visible splitting, flattening or hardening of the gasket
• Moisture or salt residue around the starter connection area
• Corroded starter terminals or fasteners
• Intermittent cranking caused by contaminated electrical connections
• Gasket damage discovered during starter removal or overhaul

🛠️ Service Notes

• Fit a new gasket every time the joint is disturbed — a gasket takes a permanent set once it has been torqued and will not seal reliably a second time
• Scrape both faces back to clean bare metal, keeping the blade at a shallow angle so it lifts the old material without gouging the surface, and use a plastic scraper on aluminium castings
• Check the faces for flatness, cracks and corrosion pitting, and make sure no old gasket, carbon or hardened sealant is left in the corners or around the bolt holes
• Fit the gasket dry unless the workshop manual for your engine calls for a sealant, and then only the type it specifies — surplus sealant squeezes out into oil, coolant and fuel passages
• Draw the fasteners down progressively in the sequence and to the torque given in the manual for your engine, and recheck after the first heat cycle where the manual asks for it

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21380910 - companion starter-system gasket; not interchangeable
• 21423488 - associated 12V starter motor, replacing 874501
• 21423489 - associated 24V starter motor, replacing 874674

📦 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