20405507 Gasket | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gasket fitted within the mechanical governor assembly. It seals the lower cover and internal control region used by the governor piston, levers and control rod.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Dedicated mechanical-governor gasket
• Installed at the documented governor
• Suitable for 1500, 1800, 1900 and 2300 rpm governor variants where listed
• Seals fuel, oil, air or control passages within the governor assembly
• Should be renewed whenever the adjoining governor components are separated
• Engine type: Volvo Penta D4, D5 and D7 mechanical-governed industrial diesel

🔌 Function

Seals its assigned governor housing or cover joint so the speed-control piston, levers and pressure passages operate without leakage.

⚠️ Common Signs of Failure

• Fuel or oil seepage from the governor
• Unstable idle or governed speed
• Poor throttle response
• Air or contamination entering the governor housing
• Gasket hardening, tearing or extrusion

🛠️ 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

• 20590563 - related TD/TAD governor references
• 20590571 - related TD/TAD governor references
• 21120693 - related governor references
• 20700657 - related governor references
• 20412752 - related governor covers
• 20505913 - related governor covers
• 20460275 - governor housing
• 20405867 - control rods
• 20405868 - control rods
• 20460068 - related six-point socket screw

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD420VE
• Volvo Penta TAD620VE
• Volvo Penta TAD722GE
• Volvo Penta TD420VE