With the crankshaft at TDC, look at the two camshaft sprockets.
Here’s a detailed guide for the — a 1.3L, 4-cylinder, DOHC, chain-driven engine.
This is where most mechanics get confused. The 2SZ-FE has two camshafts: Intake (front) and Exhaust (rear). The timing chain wraps around these, and they must align perfectly. toyota vitz 2sz timing marks
If you do not release the timing chain tensioner correctly, the chain will be loose, and the cam sprockets can jump when rotating the engine. Always compress and pin the tensioner before installation, then release after all marks are set.
The are simple but unforgiving. Unlike older Toyota engines where you could “eyeball” the timing, the 2SZ’s VVT-i system demands precision. Always double-check your work after two full crankshaft rotations. With the crankshaft at TDC, look at the
: The first step is always bringing the No. 1 cylinder to TDC. This is verified by aligning the notch on the crankshaft pulley with the "0" mark on the engine's timing cover.
For chain replacement, no—if you never separate the VVT-i sprocket’s inner and outer sections. If you remove the sprocket from the camshaft, you must lock the internal mechanism using a 5mm hex key inserted into the lock pin hole on the side of the sprocket. The 2SZ-FE has two camshafts: Intake (front) and
If the marks are off by half a tooth or more, you must remove the chain and reposition it.
The crankshaft keyway points to approximately 2 o’clock at TDC, not straight up. Do not align timing using the keyway alone. Use the marked dot.
Disclaimer: This article is for informational purposes. Always follow manufacturer procedures and safety precautions. The author is not liable for damage or injury resulting from the use of this information.