When replacing spark plugs, it is important to follow the manufacturer's recommendations for the correct type and gap setting. Using the wrong spark plugs can lead to engine misfires and poor performance. Additionally, it is essential to properly torque the spark plugs to prevent damage to the cylinder head.
b) The area where the oil seal is seated is to be plunge ground in order to prevent wear grooves that normally tend to wear out the lip of the oil seal at a faster rate.
Among the most common causes of oil seal failure are: