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To adjust the valve clearance on an Isuzu A4BA1 diesel engine, first ensure the engine is cool and remove the valve cover. Rotate the engine to bring cylinder number one to TDC (top dead center) on the compression stroke. Use a feeler gauge to check the clearance between the rocker arm and valve stem, and adjust the clearance by loosening the lock nut and turning the adjusting screw until the desired clearance is achieved, typically around 0.20 mm for intake and 0.25 mm for exhaust. Finally, recheck the clearance after tightening and replace the valve cover.

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2w ago

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