Q Any tips for completing the job when resurfacing 16.3L Mack diesel cylinder heads?
A The AERA Technical Committee recommends that you pay attention to the fire ring grooves on 1990-2000 Mack E9 diesel engine cylinder heads whenever you resurface the head.
This cylinder head incorporates a circular groove around each combustion chamber and a fire ring bead on the cylinder sleeves. The ring should be restored before returning the head to service.
The fire ring groove on the head surface is required to seal this engine