Subaru Robin PKX201 - Manual (Page 81)

High Pressure Pumps - PKX Service
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25. When reassembling the back plate to the engine make
sure the weep hole is facing towards the bottom of
frame. The weep hole is to prevent water from entering
engine should a mechanical seal wear out.
26. Install the pump back plate onto the engine. Install
with one bolt to hold into position.
27. Place a small amount of thread lock sealer on the tip
of the bolts before reinstallation. Note: only use
Allen head bolts and special sealing wahsers.
Washer should fi t snug around bolt. Inspect for cracks
in the sealing surfaces of the washers. Replace with
new if needed. Note: Threadlocker Blue or Purplefrom
Permatex is recommended. It is a light, or
medium strength product, and service removable.
28. The four bolts should be tightened snugly by hand.
Tighten diagonally to ensure even installation.