Attention: TDR Forum Junkies The locating pin is one of two that LOCATES the gear housing in relation to the engine block. The bolts are fasteners and FASTEN the housing to the block. The bolts in themselves would not assure location of the housing/block and pump timing relationship.
Normal standard design and manufacturing clearance between fastener (bolt) and it's clearance hole is . 015 in. per side. This might allow the housing to move from it's intended timed location by at least . 015 in. maybe more depending on the manufacturing tolerances and stack up of tolerances.
Again. . the fasteners (bolts) might not let the housing shift in relation to the block. I think after setting pump timing with a dial indicator, and having that pump hung off of the housing, I'd want the housing pinned for location.
Just for thought... .
Normal standard design and manufacturing clearance between fastener (bolt) and it's clearance hole is . 015 in. per side. This might allow the housing to move from it's intended timed location by at least . 015 in. maybe more depending on the manufacturing tolerances and stack up of tolerances.
Again. . the fasteners (bolts) might not let the housing shift in relation to the block. I think after setting pump timing with a dial indicator, and having that pump hung off of the housing, I'd want the housing pinned for location.
Just for thought... .
