Here's a general overview of the process:
1. Preparation: Ensure the crankshaft is clean and free of debris. The timing gear itself should also be clean. You'll need a suitable crankshaft gear installer tool (often a slide-hammer type) and possibly a torque wrench. Consult a shop manual specific to your year and model 305 for exact torque specs.
2. Alignment: The crankshaft needs to be positioned correctly. This usually means aligning the timing marks on the crankshaft and the damper (harmonic balancer). The shop manual will show you precisely where these marks should align. Make absolutely sure they're correct *before* proceeding.
3. Gear Installation: Using the crankshaft gear installer, carefully push the timing gear onto the crankshaft. The installer helps prevent damage to the gear teeth. Avoid hammering directly on the gear.
4. Tightening: Once the gear is fully seated, carefully tighten the crankshaft gear retaining bolt or nut. This is crucial. Use the correct torque specification from your shop manual. Over-tightening can damage the crankshaft. Under-tightening will allow the gear to slip.
5. Verification: After tightening, double-check the alignment of the timing marks again. Ensure the gear is properly seated and the retaining bolt/nut is secure. If you’re uncertain, it's best to seek advice from a mechanic before proceeding further.
Important Considerations:
* Shop Manual: A factory service manual specific to your 305 engine is absolutely essential. It will provide detailed instructions, diagrams, torque specifications, and other critical information. Don't attempt this without it.
* Tools: You'll need the correct tools. Improvising can lead to damage.
* Cleanliness: Keep everything clean to prevent debris from getting into the engine.
* Timing Chain/Belt: This is usually installed *after* the crankshaft gear. Refer to your shop manual for the proper procedure.
Disclaimer: This is a general overview. Always refer to a factory service manual for your specific engine before attempting this repair. Improper installation can cause severe engine damage. If you are unsure about any step, seek professional help from a qualified mechanic.
