Remove/Replace 1.6L N/A Head Gasket

[rkas48]

Bentley in Fig. 5-11 says to knock out the prechamber inserts, new ones are not available as replacement parts. Then later saye to reinstall the old ones.

If new ones are not available, why remove the old ones?

Is there a reason for this that I am not seeing?

[VanagonExpress]

One of the many marvels that Bentley conjures up