AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 43)

MAINTENANCE
38
Figure 6.20
Concave Style Head
8. Place the shell gasket then the release
gasket on top of the shell ring and align the
gasket holes with those in the flange.
9. Place the upper head liner (dimple facing
in/down) on top of the gasket, with all holes
aligned. Then place the upper head on the
upper head liner.
10. Place the upper head ring on top of the
upper head.
11. Reassemble the studs and nuts through the
upper head and shell ring. Cross tighten the
nuts to approximately 75 ft./lb, to obtain
uniform seating, and then progressively
tighten the nuts to 150 ft./lb.