Weichai America Corp.
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2.7.4 Inspection and maintenance of flywheel housing.
Key point 1:
Assembling
Check whether flywheel is cleaned up. Debut the corresponding fitting surface on engine block
with 240# fine oil stone and clean the surface with ethyl alcohol. Apply sealant on fitting surfaces
of flywheel housing and engine block. Bolts and tools: M10-10.9 hexagon bolts (×12), M12-10.9
hexagon bolts (×6), 17mm and 19mm socket spanner.
Step 1: Preassemble the bolts
Step 2: Follow the sequence of arrow to tighten the M10 bolts, tighten torque for M10 bolts is
80~85Nm. And then tighten the M12 bolts according to the marked order 1-2-3-4-5-6, tighten
torque for M12 bolts is 140~145Nm.
Fig. 2-14 tightening sequence of flywheel housing
NOTICE: For the strengthening bolts listed above, the thread and bearing surface of each bolt
should be applied with lubricating oil before assembling.
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