VolvoEngine Parts

1549651 — Renault O-Ring - Thermostat To Cylinder Head

This is a high-quality O-ring seal designed to prevent coolant leaks between the thermostat housing and the cylinder head on specific Volvo and Renault truck engines. It is manufactured from durable, heat-resistant rubber to maintain a tight seal under demanding engine operating temperatures, unlike a worn or cracked O-ring that will allow coolant to escape. Operators may observe coolant leaks around the thermostat housing, a drop in coolant level, or the engine overheating if this O-ring fails.

Renault O-Ring - Thermostat To Cylinder Head – Part No 1549651 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Cross References & OEM Numbers

Alternate part numbers that interchange with Volvo 1549651

Fitment: Volvo Trucks: FH13: 2006> 2007, FH16: 2003> 2005, FM9: 2002> 2007, FM13: 2006> 2007, Volvo Bus: B9/11/12/13 [D/DH Engine] B9L, B11R, B12B/M, B13R, Renault Trucks:

Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeO-Ring Seal
MaterialHeat-resistant EPDM rubber
ApplicationThermostat housing to cylinder head seal
Service LifeReplace as needed during thermostat service
CompatibilityVolvo/Renault specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failed O-ring is typically a visible coolant leak around the thermostat housing area. If left unaddressed, the coolant level will drop, potentially leading to engine overheating and reduced cooling system efficiency. Continued leakage can cause corrosion and damage to surrounding engine components.

Installation Tip

Ensure the sealing surfaces on both the thermostat housing and the cylinder head are perfectly clean and dry before installing the new O-ring. Lightly lubricate the O-ring with coolant to ease installation and prevent pinching.

Service Note

Always replace the thermostat itself when replacing the thermostat housing O-ring, as they are typically serviced together.