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To replace the valve stem seals with the head on you must bring each cylinder up to top dead center, pressurize the cylinder with an air chuck screwed into the spark plug hole.

(this prevents the valves from dropping into the cylinder) Now the seals on that cylinder can be replaced. The process is repeated on each cylinder. Note: you must prevent the engine from rotating when the cylinder is pressurized.

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10y ago
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Q: Can you replace valve seals without taking the head off a Mazda b2200?
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