TDC - Top Dead Center and how to find it on a Jeep 4.0

In this video we explain what TDC or top dead center is on an internal combustion engine. This is a critical point for engine timing and is often used to set the synchronization of sensors on the engine. We show what happens with the valves and pistons during the rotation of the engine. At the end of the video we explain the easiest way to find TDC by removing cylinder 1's spark plug and using your finger to feel for the compression stroke. This video shows how to do this on a Jeep 4.0 engine commonly found on Cherokee XJ's, Wrangler TJ's and YJ's as well as Grand Cherokee WJ's.

00:00 - Introduction
01:17 - TDC description
02:29 - Two timing mark discussion
02:58 - Power stroke
03:44 - Exhaust stroke
05:02 - Intake stroke
06:35 - Compression stroke and TDC
07:32 - How to find TDC
09:18 - Cam position sensor
10:03 - What to do if you cant find your timing mark