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Cam installation on the QR25 is not overly difficult, but there are a few surprises. After removing the front timing inspection plate, you need to push the timing chain tensioner back and put a small drill bit in the retaining hole to keep it from popping out when the chain is removed. You should also watch for the small O-ring around the port supplying oil to the variable valve timing actuator. It sometimes sticks to the front cover when the inspection plate is removed, and can easily drop into the nether regions of the engine.
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