20727018 Cover | Genuine Volvo Penta Part

🔧 Product Description

Service cover used in the D5/D7 coolant-circulation-pump and thermostat assembly. It closes the designated pump or thermostat chamber and provides the original hose/pipe sealing interface.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD1643GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TAD1640-42GE-B
• Volvo Penta TAD1640GE
• Volvo Penta TAD1640VE-B
• Volvo Penta TAD1641VE-B
• Volvo Penta TAD1642VE-B
• Volvo Penta TAD1641GE
• Volvo Penta TAD1642GE
• Volvo Penta TAD1641VE
• Volvo Penta TAD1642VE
• Volvo Penta TAD1643VE
• Volvo Penta TAD1650GE
• Volvo Penta TAD1651GE
• Volvo Penta TAD1650VE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TWD1663GE

• Engine Family: TWD, TAD
• HP Range: Approximately 300 HP
• Year Range: Approximately late 1990s-2000s

⚙️ Key Features

• OEM machined sealing face and port geometry
• Used with the engine coolant pump and thermostat circuit
• Designed for hot coolant and pressure cycling
• Works with the specified sealing rings, connection pipe and flange screws
• Direct replacement for a cracked, corroded or distorted cover
• Engine type: Four- and six-cylinder turbocharged Volvo Penta diesel

🔌 Function

Seals and supports the designated coolant-pump or thermostat chamber while maintaining the original coolant-flow path.

⚠️ Common Signs of Failure

• Coolant leakage at the cover or connection pipe
• Corrosion, pitting or cracking of the cover
• Warped sealing face causing repeated gasket or O-ring failure
• Restricted coolant flow from internal scale or damage
• Rising engine temperature or coolant loss

🛠️ Service Notes

• Clean both sealing faces back to clean metal and check the cover for distortion, cracks or pulled bolt holes before refitting — a warped flange will not seal even with a new gasket
• Where the joint uses a gasket, seal or O-ring, always fit a new one and seat it dry unless the workshop manual for your engine specifies a sealant; never try to make a poor joint tight with extra sealant
• Tighten the fasteners progressively and evenly, working out from the centre, to the figure given in the manual for your engine — pressed steel, alloy and plastic covers distort easily if pulled down hard or unevenly
• If the cover carries a shaft seal or bearing, support it square to the shaft as it goes on so the seal lip is not nicked or rolled over
• Check that any breather, drain or oil return passage in the cover is clear before final tightening, and look for leaks once the engine has been run up to temperature

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20727018 → Supersedes 8131377

OEM / Related Numbers

• 8131377 earlier number superseded by this part
• 22902431 coolant pump
• 21103569 rubber moulding
• 21420336 connecting pipe
• 21423788 and 20799996 sealing rings
• 20824017 spacer sleeve
• 21613426 thermostat
• 984734 and 994386 retaining screws

OEM Reman Alternatives

• 3801741 remanufactured coolant pump

📦 Condition

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