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32K service. All valves in tolerance, roughly -.01 or -.02mm tighter than the nominal, save for one Exhaust Valve. The cylinder 1 exhaust valve was .05mm too big of a gap (+.02mm out of tolerance).
My years of engine work tells me that too large of a clearance robs some power, making the engine not run smoothly and results in ticking, but causes no damage. I hear no ticking, the injectors are certainly louder, and I feel no uneven running, so my hunch is I also have no loss of power or mileage to concern myself over.
I have decided not to pull the camshaft to inspect the current shim and possibly set the clearance down and instead wait for the 64K service where I expect that all the valves may tighten up an additional .02mm putting that exhaust valve into tolerance and all the others on the verge of being too tight. Main reason for deciding not to adjust is the disturbing a functional valve train and the bother of waiting for the shim to be ordered with no practical gain. I suspect the factory made the similar decision when they discovered they put an out-of-specification shim in.
Now to the reason for this posting, each engine is different nonetheless, and as a result I do have some small doubt as to my decision; 2mpg or 5hp would be worth it. For those more practically or pragmatic minded (perfectionists need not apply); any Confirmation or Dissenters?
ObligatoryDisclaimer: I deny the above posting when it comes to warranty adjustments, the above is for entertainment only. For example, I decided to add a thin coating of Velveeta to resolve the clearance problem to mitigate the engine damage. Prove me wrong.
My years of engine work tells me that too large of a clearance robs some power, making the engine not run smoothly and results in ticking, but causes no damage. I hear no ticking, the injectors are certainly louder, and I feel no uneven running, so my hunch is I also have no loss of power or mileage to concern myself over.
I have decided not to pull the camshaft to inspect the current shim and possibly set the clearance down and instead wait for the 64K service where I expect that all the valves may tighten up an additional .02mm putting that exhaust valve into tolerance and all the others on the verge of being too tight. Main reason for deciding not to adjust is the disturbing a functional valve train and the bother of waiting for the shim to be ordered with no practical gain. I suspect the factory made the similar decision when they discovered they put an out-of-specification shim in.
Now to the reason for this posting, each engine is different nonetheless, and as a result I do have some small doubt as to my decision; 2mpg or 5hp would be worth it. For those more practically or pragmatic minded (perfectionists need not apply); any Confirmation or Dissenters?
ObligatoryDisclaimer: I deny the above posting when it comes to warranty adjustments, the above is for entertainment only. For example, I decided to add a thin coating of Velveeta to resolve the clearance problem to mitigate the engine damage. Prove me wrong.