Locating the OM616 and OM617 Internal Engine Timing Marks

May 28, 2022


Welcome to Grafco Electric's comprehensive guide on locating the internal engine timing marks for the OM616 and OM617 engines. In this detailed guide, we will provide you with step-by-step instructions and valuable tips to help you accurately set the timing for your engine.

Understanding Engine Timing

Before we dive into the process of locating the internal engine timing marks, let's first understand the importance of engine timing. Engine timing refers to the synchronization of the camshaft and crankshaft movements, ensuring that the engine's valves open and close at the correct time in relation to the piston's position. Accurate engine timing is crucial for optimal engine performance and efficiency.

Tools and Preparations

Before we begin, make sure you have the necessary tools and equipment. You will need a timing light, a socket set, a wrench, and a reliable timing diagram specific to your engine model. Additionally, ensure that the engine is cool and in a safe working condition.

Locating the Timing Marks

1. Start by locating the timing pointer on the engine. The timing pointer is usually positioned near the harmonic balancer or the front crankshaft pulley. It may require some cleaning or removal of dirt and debris to clearly see the pointer.

2. Once you have found the timing pointer, identify the timing marks on the harmonic balancer or the front crankshaft pulley. These marks indicate the positions of the crankshaft during the engine's rotation.

3. Refer to the timing diagram specific to your engine model and find the specified degree measurement for the desired timing. The degree measurement defines the position of the crankshaft at which the valves should be properly timed.

4. Rotate the engine using a wrench or socket, aligning the timing mark on the harmonic balancer or front crankshaft pulley with the timing pointer. This ensures that the engine is in the correct position for timing adjustment.

5. With the engine properly aligned, connect the timing light to the battery and the number one spark plug wire. Start the engine and aim the timing light at the timing marks. The timing light will illuminate the timing marks as the engine runs.

6. Adjust the timing by loosening the distributor clamp or the distributor hold-down bolt. Gently rotate the distributor until the timing marks align with the timing pointer, as indicated by the timing light. Secure the distributor in place once the timing is accurate.

7. After adjusting the timing, double-check the alignment of the timing marks to ensure accuracy. Make any necessary fine adjustments as needed.


Congratulations! You have successfully located the internal engine timing marks for the OM616 and OM617 engines. Accurate engine timing is vital for optimum engine performance, efficiency, and longevity. If you have any further questions or need assistance, don't hesitate to reach out to Grafco Electric's team of experts.

About Grafco Electric

Grafco Electric is a leading provider of electrical solutions, specializing in engine maintenance, repairs, and overall performance optimization. With years of experience, our team of highly skilled technicians is dedicated to delivering top-notch electrical services to our customers. Contact us today for all your engine-related needs!

Hugo Gomez
Love this! 🔥
Nov 8, 2023
Jac Schuster
Great guide! The step-by-step instructions really helped me accurately set the timing for my engine. Very informative and easy to understand.
Oct 13, 2023