Cylinder Head - Cracks Between the Valve Seats
NUMBER: 02-88-93DATE: 02-05-93
APPLICABILITY:
L-SERIES AND LOYALE 1.8 LITRE
MPI & SPI OHC ENGINES
SUBJECT:
CYLINDER HEAD CRACK BETWEEN THE VALVE SEATS
DO NOT REPLACE CYLINDER HEADS FOR A CRACK BETWEEN THE INTAKE VALVE SEATS.
Some cylinder heads may exhibit cracks between the intake and exhaust valve seats, shown. These "bridge cracks" do not cause coolant leaks or result in valve seat movement. "Bridge cracks" are cosmetic in nature, and do not justify replacement of the cylinder head. See Figure 1.
Production Changes to Prevent Bridge Cracking
1. A chamfer was made between the valve seats and the cylinder head.
2. Distance between the intake and exhaust valves was increased.
This condition does not affect the integrity or durability of the cylinder head nor the operation of the engine. This is not a matter for warranty.