Inspect the capscrew bosses for cracks or porosity that extend into the coolant cavities or that have damaged
threads.
Thread repair inserts can be used to fix most cases of thread damage and minor cracks. Refer to Cylinder Head
Capscrew Hole Repair in Section 1-03.
Closed end thread repair inserts can be used in conjunction with upper counterbore sleeves (0.020-inch oversize
on the outside diameter or smaller), and coolant passage repair inserts.
Cylinder blocks with vertical cracks that extend down over the counterbore ledge that can not be machined out
using a 0.750-inch long sleeve can not be repaired.
In this case, the cylinder block must be replaced.
Mark all cylinder head capscrew holes that are to be repaired. Refer to Cylinder Block Machining – Cylinder
Head Capscrew Hole Repair in Section 1-03.
