How to Align Timing on Older 4G64 Engine?
2 Answers
Rotate the engine crankshaft to position the No. 1 cylinder piston at top dead center. Align the timing mark on the camshaft gear with the timing mark on the chain. Ensure the timing marks on the chain align with those on the sprockets at identical positions. Ultimately verify that all three timing marks on the timing chain correspond precisely with two marks on the camshaft sprocket and one mark on the crankshaft sprocket respectively.
Last time I adjusted the timing on the old 4G64 engine, it was quite challenging. You'll need to prepare the tools: a wrench, crankshaft positioning pin, and a marker pen. First, rotate the crankshaft to bring the No. 1 piston to top dead center (TDC) on the compression stroke—you can align the mark on the pulley with the mark on the cylinder block. The small dot on the camshaft gear should align with the indicator point on the cylinder head, and use the marker pen to mark the position to prevent misalignment. Then, loosen the bolts on the alternator and water pump. When installing the new belt, make sure it's tight but not overly forced to avoid skipping teeth. After installation, manually turn the engine a few times to ensure the marks haven't shifted. Finally, start the engine and listen for any knocking or unusual noises—if there aren't any, you're good. Safety first—don't forget to wear gloves, and it's best to have a helper assist with turning the wheel. If the belt is old and has cracks, replace it immediately to avoid issues on the road.
