I'm installing a new injection pump on a 606. I'm using the little tool that threads into the side of the pump and engages the pump shaft to prevent it from rotating and then installing it with the engine 15deg ADTC. I notice when I tighten the timing sprocket onto the front of the pump, a left hand threaded bolt is used. The engine, however, turns the opposite direction, so that there is maximum backlash between the timing chain and the pump sprocket after the bolt tightened. If I wiggle the pump sprocked bolt clockwise after it has been tightened (the direction that the engine will turn the sprocket, it has several (about 3-5) degrees of backlash, and as a result the IP timing changes the same amount. My question, is: should I simply not worry about the backlash or should I then rotate the pump again to compensate? Additionally, is the backlash a sign of something else being haywire (ie. stretched chain)?

Much thanks for any help.

Galen Bowen
1983 Toyota Landcruiser FJ-60 w/ Mercedes 606 motor/Chevy NV4500 tranny