Engine, timing and cooling: repair costs

Timing belts and chains, water pumps, radiators and gaskets. Typical ranges for the Boston area.

Timing belt replacement$500 to $1,725. The rubber timing belt keeps engine valves and pistons in sync and must be replaced on schedule. If it breaks, many engines suffer major internal damage.
Timing chain replacement$1,250 to $2,850. A stretched or noisy timing chain, guides and tensioner are replaced. Signs include rattle on startup, timing codes, or a rough-running engine.
Water pump replacement$310 to $1,275. The water pump moves coolant through the engine. A leaking, noisy or failing pump can cause overheating and should be replaced quickly.
Thermostat replacement$120 to $470. The thermostat controls engine temperature. A stuck one can cause overheating, no heat from the vents, or poor mileage.
Radiator replacement$320 to $1,125. A leaking or clogged radiator is replaced so the engine can cool itself. Signs include coolant leaks, overheating and a sweet smell.
Valve cover gasket replacement$190 to $750. A leaking valve cover gasket is replaced to stop oil seeping onto the engine. Signs include a burning oil smell, oil on the engine, or spark plug well leaks.
Engine mount replacement$230 to $800. A worn or broken engine mount is replaced. Signs include clunking, shaking at idle, or the engine moving too much when you accelerate.
Head gasket replacement$1,475 to $4,275. A blown head gasket is replaced to stop coolant, oil or pressure from leaking between engine parts. Signs include overheating, white smoke and milky oil.

Other repair types

Typical range, estimate. Prices updated October 2026. Not a repair shop, estimates only.