No actual listing for the water pump bolts, however my manual has torque settings for the 5/16th dia bolts on the rocker gear and the cylinder head at 18lb. The inlet to exhaust manifold bolts are listed as 17lb. From memory the water pump has 5/16" bolts too! So assuming all these bolts are the equivalent grade/tensile to the water pump bolts, there is your answer. Maybe start at 15 or 16lb and if you think they need a bit more increase the torque. Or do one freehand with a spanner to what you think is a reasonable tension for the dia of the bolt, then set your tension from it, if you know what I mean.
Good luck.
Cheers, Mick.
1974 S3 88 Holden 186.
1971 S2A 88
1971 S2A 109 6 cyl. tray back.
1964 S2A 88 "Starfire Four" engine!
1972 S3 88 x 2
1959 S2 88 ARN 111-014
1959 S2 88 ARN 111-556
1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
REMLR 88
1969 BSA Bantam B175
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