knock can be heard at cylinder head cover.
8. Top of piston bumps cylinder head or valve so that
metallic rapping can be heard near the cylinder head in
8. Adjust the valve clearance, valve timing
or replace the head gasket.
9. Gear clearance is too large due to wearing so that
clash can be heard at gear box when speed is decreased
9. Replace the gear as appropriate.
(IX) Excessive Lubricating Oil Consumption
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