This is the genuine Nissan long bolt for the top of the thermostat housing, specifically for the TD42 diesel engine. This bolt is known to rust and seize in the housing, often snapping when you try to remove it during a thermostat or coolant change. A broken or damaged bolt prevents the housing from sealing correctly against the gasket. If you fail to replace it, you will likely have a persistent coolant leak, which can lead to engine overheating and major mechanical failure.
Please check vehicle fitment to confirm compatibility with your vehicle. Please contact us with your VIN details if you require further assistance to confirm fitment.
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