The 1TR-FE uses a with a hydraulic tensioner. The manual shows exactly how to align the camshaft and crankshaft sprockets (checking the colored links on the chain). Ignoring this leads to a P0340 code and poor performance.
Toyota's Variable Valve Timing with intelligence (VVT-i) allows the engine to optimize valve timing for performance and efficiency. Early versions (pre-2015) used VVT-i only on the intake camshaft. In 2015, the engine received a upgrade, adding variable timing to the exhaust camshaft as well. This improved throttle response, reduced emissions, and boosted fuel economy without sacrificing durability. toyota 1tr fe engine workshop manual.zip
The 1TR-FE uses a timing chain rather than a rubber belt, which is designed to last the lifetime of the engine. However, oil neglect can cause chain stretch or guide wear. The manual details how to: The 1TR-FE uses a with a hydraulic tensioner
A complete workshop archive contains structured PDF modules. These documents guide you through every stage of mechanical service. 1. Engine Mechanical & Rebuild Specs Engine Mechanical & Rebuild Specs