Subaru Robin PKX201 - Manual (Page 11)

PTG109 Service
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27. After placing the bolts into the back plate, tighten the
bolts snugly.
Proper torque clearance should be 2.2 to 3.7 ft. lbs
25. After the seal has been installed place the pump back
plate over the crankshaft and loosely install one of the
bolts to hold it in position.
26. A small amount of thread locker compound should be
used on the tip of the bolts. This thread locker should
be a service replaceable type such as Permatex® Blue
or Purple.
28. If the pump came installed with shim(s) they must be
replaced with same number that came off. If none
were installed originally, then do no put a new shim on
unless gap between impeller and volute is wider than
the tolerance allows.