Hyundai 35DS-7 Operation Manual page 186

2) DISASSEMBLY AND REASSEMBLY
(1) Replacing O-ring on contract surface
Loosen the M8 bolt, and then remove
bolt and spring washer.
Remove valve body block from the
mono-block. At this time, care must be
taken not to damage machined contact
surface.
Replace some O-ring on contact surface.
Before assembling, the contact surface
must be thoroughly cleaned of foreign
matter. Then reassemble in opposite
order mentioned above.
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