Posted: Oct 01 2008 at 11:33am | IP Logged
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Ok I did a little research and it's suggesting that it's your valve Tappets. There was a recommendation to adjust valves. But I don't believe you need to. It's hard to say as I couldn't get a good breakdown of that Valve Train group.
But I can say that some Valve lifters use oil pressure as a cushion and to keep in close tolerances with the camshaft. It's common for these when cold to take while to fill back up with oil. Creating a gap and when the camshaft comes around to open it slaps the lifter. Making a clicking or tapping noise.
Wether or not this is the case with yours I can't for sure as I couldn't find a Theory of Operation regarding the valvetrain.
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