How to align the timing marks on the Highlander 2.7 balance shaft?
3 Answers
First, rotate cylinder 1 to top dead center (TDC), then align the dot on the balance shaft gear. The balance shaft has a self-weighting force - rotate it to a specific angle for installation. Balance shaft technology is a simple yet highly practical engine technology that effectively reduces vehicle vibration and improves driving comfort. Common causes of loose balance shaft bearings and abnormal wear on bearing seats include poor engine balance and restricted movement of the rolling bearings.
For the balance shaft timing marks on the Highlander 2.7L engine, the key is aligning the crankshaft and balance shaft marks. First, rotate the engine to the TDC (Top Dead Center) position of cylinder #1, locate the timing mark on the crankshaft gear - at this point, the small notch or mark on the balance shaft gear should align with the designated scale on the engine block. It's recommended to secure the crankshaft with a torque wrench to prevent movement. After confirming alignment, manually rotate the engine one full revolution to check if vibration reduces. Always refer to Toyota's official service manual as specifications may vary across model years. Ensure you have proper tools like calipers for precise measurement. Misalignment will cause increased engine vibration, affecting driving smoothness - prompt correction is crucial. This step requires meticulous attention and must be verified during every major overhaul.
I just dealt with this issue – severe vibration after an engine repair, and found out it was due to misaligned balance shaft marks. During the operation, set cylinder 1 to top dead center, and align the small dot on the balance shaft gear with the mark on the crankshaft pulley. It's best to work at night when it's quieter and there's better lighting. Never force-tighten, as it may cause the screws to strip. After finishing, start the engine to test; if the vibration is gone, it means it's correct. Beginners should take it slow and can use a phone to photograph the positions. From experience, don't rely on memory for such delicate work – the manual is your best friend. If done wrong, the car will drive like it's dancing, which is really annoying. Fix it in time to avoid future troubles.
