Twin Disc MG-5170DC, Service Manual

Page: 139 / 250

139
Twin Disc, Incorporated
Assembly
Marine Transmission Service Manual #1020667
Assembly and Installation of Manifold
1. Install new O-rings onto the O-ring plugs used for the clutch and lube
pressure test ports. Lubricate the O-ring and threads and install the
plugs, torquing them to 24 Nm (18 ft-lb). Apply pipe thread sealant to
the 1/2” NPTF plugs and install them into the manifold, torquing them to
68 Nm (50 ft-lb). Place new O-rings onto the two O-ring plugs and install
them into the manifold side opposite the oil filter boss, torquing them to
54 Nm (40 ft-lb). Apply pipe thread sealant to the 1/4” NPTF plug and
install it into the manifold below the oil filter, torquing it to 34 Nm
(25 ft-lb). Apply pipe thread sealant to the 3/4” NPTF plug and install it
into the manifold above the oil filter, torquing it to 73 Nm (54 ft-lb).
2. Assemble and install filter bypass valve components. Torque the screws
to 20 Nm (15 ft-lb).
Figure 102. Installing Filter Bypass Valve Components
3. Apply a coat of assembly grease or oil to the seal rings of both clutch
shafts. Center the seal rings in the shaft grooves to prevent seal ring
damage during manifold installation.
4. Install assembled manifold over alignment studs and dowels. Use a
soft hammer (near the dowels) to seat manifold against gasket and over
dowels. Install manifold attaching screws and torque to 37 Nm (27 ft-lb).