The Camshaft Synchronizer assembly is basically an ignition distributor body without the points assembly. Instead, it uses a trigger tooth and pickup sensor (Camshaft Position Sensor) to time ignition spark.
- Disconnect negative battery cable from battery.
- Remove intake accordion tube.
- Disconnect throttle body from upper intake manifold and position to the side.
- Some manuals suggest removing the upper intake manifold completely. This does allow for more access to position the wiring harness out of the way. However, you should replace the intake manifold gaskets if you remove the manifold.
- Disconnect coolant crossover tube from lower intake manifold.
- Disconnect camshaft position sensor plug.
- Remove camshaft position sensor by loosening the two small bolts.
- IMPORTANT!!! Note the position of the trigger tooth!!!
- Mark the position of the trigger tooth in relation to the synchronizer body. A Sharpie or White-Out works great.
- Also mark the position of the synchronizer body in relation to the engine. This will give a general mark to align with when inserting the body.
- Remove camshaft synchronizer hold down bolt.
- Clean dirt and debris away from the base of the synchronizer.
- Lift the synchronizer up and out of the engine.
- Lubricate the new synchronizer by squirting oil into the oil holes. Lightly oil the gear and lower oil o-ring.
- Gently lower new synchronizer into the engine.
- Align the synchronizer. The trigger tooth MUST be in the same relative position to the synchronizer body as the old assembly.
- With the synchronizer body aligned to the engine, make fine adjustments clockwise or counter clockwise to align the trigger tooth to the synchronizer body.
- Refer to the marks made on the old assembly and position the new trigger and body exactly like the old one! The trigger position relative to the body must be the same as the old assembly!!!
- To get the alignment of both the body to engine, and tooth to body, it may require raising and lowering the synchronizer several times. The cam gear will turn the trigger a few degrees as the synchronizer is lowered into position. Before lowering, set the tooth about 10 degrees counterclockwise to your mark on the synchro body.
- Install the synchronizer hold down bolt.
- Install the position sensor.
- Reconnect sensor plug.
- Follow the reserve steps 4 through 1.
Most manuals state to set the engine to TDC on cylinder #1 before removing the old synchronizer.
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