: Denso K16R-U or NGK BKR5EYA with a 0.8 mm gap. Torque to 18 Nm.
The 1SZ-FE uses a single timing chain to drive the intake camshaft, while the exhaust camshaft is driven via a slave gear meshed with the intake camshaft gear. Setting Top Dead Center (TDC)
The water pump is driven by the timing chain. While the timing chain itself is robust and rarely needs replacement, the water pump gaskets can weep coolant. Keep an eye on your coolant reservoir level. 1szfe engine manual top
Remove the lifter bucket and read the thickness code stamped on its underside (e.g., a stamp of "20" means 2.20 mm).
Cylinder head removal (if required)
If you are looking under the hood (the "manual top" view of the engine bay) to assess health, here are the top three areas to inspect.
0.15 mm to 0.25 mm (0.006 to 0.010 inches) : Denso K16R-U or NGK BKR5EYA with a 0
Before disassembly, perform the following:
| Symptom | Most Likely Cause (1SZ-FE) | | :--- | :--- | | Cold start rattle (1-2 sec) | Worn timing chain tensioner (spring failure) | | Misfire only when warm | Clogged EGR passages or failing ignition coil #2 | | P0011 (Over-advanced timing) | Dirty VVT-i oil filter screen (under solenoid) | | Low oil pressure after rebuild | Missing or misaligned oil pump relief valve | | Continuous chain noise | Stretched chain or failed chain guide (plastic face) | Setting Top Dead Center (TDC) The water pump
Here are the specifications of the 1SZ-FE engine: