Worn cam chain, or distributor loose or worn.
To set the timing on a Mercury 50 HP engine, first, ensure the engine is in a safe, stable position and that you have the necessary tools, including a timing light. Disconnect the spark plug wires and connect the timing light to the number one cylinder. Start the engine and aim the timing light at the flywheel to observe the timing marks. Adjust the timing by rotating the stator or adjusting the timing advance mechanism until the marks align as specified in the engine’s service manual. Always refer to the manufacturer’s specifications for precise timing settings.
Usually caused by a timing problem.
No problem
the timing
ignition problem
Actually , it has a timing CHAIN , are you having a problem ?
The symptoms of a 4.3 liter V-6 engine timing chain problem is an engine that runs very rough. The engine will shake violently.
You should always replace the timing chain, tensioners and sprockets whenever you rebuild the engine.
You don't change them unless there is a problem. Timing chains are designed to last the life of the engine and are normally replaced during an engine rebuild.
ignition problem
The timing mark for the 4JG2 engine is typically located on the crankshaft pulley or the timing belt cover. It is used to align the engine's timing components properly during maintenance or when setting the timing. You can usually find a corresponding mark on the timing cover or engine block to indicate the correct alignment. Always refer to the vehicle's service manual for precise locations and alignment instructions.
The starter turns the flywheel at the back of the engine. When the flywheel turns the whole engine turns. The timing chain is on the other end at the front of the engine. It is connected to the crankshaft and camshaft (s). So indirectly yes it does. If the whole engine is turned but the timing chain doesn't, there is a problem. Probably a broken timing chain.