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Coolant Bypass Tubes are small metal tubes mounted to the front each cylinder head. They provide a mounting point for the Bypass Hoses which carry hot coolant from the cylinder head to the upper coolant pipe.

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Replacement

Because these tend to corrode, they should be replaced as part of the Timing Belt Service. Their installation requires a thin bead of liquid gasket around their mating surface, and their 2 x 10mm bolts snugged down (no torque spec is given).

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