Here's why:
* Engine variations: Volvo 242s came with various engine configurations (B21, B21A, B21FT, etc.), each potentially having different cylinder head bolt specifications.
* Repair history: Previous repairs or modifications could have changed the original specs.
* Bolt condition: Bolt condition and material can affect required torque.
* Safety: Inaccurate torque values can lead to serious engine damage, putting you and others at risk.
What you should do:
1. Consult your Volvo service manual: This is the most reliable source for your specific engine. You can find them online or through Volvo dealerships.
2. Refer to a reputable repair manual: Haynes and Chilton manuals are good options.
3. Contact a qualified mechanic: A professional mechanic can access the correct information and ensure the work is done safely and accurately.
Remember: Always prioritize safety and consult reputable sources for accurate information when working on your vehicle.