If you hear a clattering sound on cold start or at idle, your HLAs are collapsed. Follow the manual’s “bleeding procedure”:
Since the 1G-FE uses shim-over-bucket, measuring is easy, but changing shims requires cam removal. Toyota 1g Fe Engine Manual
The head is a cast-aluminum, cross-flow design. Intake is on the right, exhaust on the left (when viewed from the driver’s seat). The DOHC arrangement uses a timing belt driving both camshafts. Notably, the 1G-FE uses tappets. While durable, valve clearance adjustment requires removing the camshafts—a labor-intensive job every 60,000 miles. If you hear a clattering sound on cold
8.0:1 to 12.5:1, depending on the generation Power Output (Standard): 135 PS (133 hp) @ 5,600 rpm measuring is easy