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Showing results for tags 'valve seating'.
Found 2 results
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The seat of the heater control valve has some pitting and corrosion. I don't have a good seal because I can blow through the valve even when fully closed. Is there a way to refurbish the valve seat to prevent it from bypassing? On the other hand, the silvery colored tubular valve stem has two 1/4 inch slits cut into it at the seating surface which appear to allow a small amount of coolant to bypass through the valve even when closed. Why the engineers wanted to allow a small leak past the seat is a mystery to me. But the main issue is the valve seat.
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- heater valve bypassing
- heater valve refurbishing
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I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. Is lapping necessary with new seats and valves? Or is lapping just an old archaic process usually reserved for well-used / pitted valves and seats?