3208 Heat exchanger bolt torque on bonnets

[Cape Dory]

Cleaning heat exchanger and need to know bolt torque on bonnets when reassembling

 

[Petehdgs]

What size bolt is it? All CAT service manuals have a bolt torque chart by thread size. From memory a 5/16 bolt (1/2" head) is 18 ft lbs. 3/8 (9/16 head) is 32 and 1/2 bolt (3/4 head) is 75. Everything else I look up.