IHI NIIGATA MG(L)26HLX, Instruction Manual

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SECTION
４
- DISASSEMBLY AND REASSEMBLY
4.8 CAMSHAFT AND TIMING GEAR TRAIN
４－８－０１
4.8 CAMSHAFT AND TIMING GEAR TRAIN
4.8.1 Camshaft
The camshaft is an integral two-piece design that can be separated for easy
removal, if required. It is driven through the timing gear train at the front
of the engine and turns at 1/2 engine speed. There are three camshaft lobes
for each cylinder; one for the fuel injection pump, one for the exhaust valve,
and one for the inlet valve. The camshaft can be removed from either end of
the engine, depending upon the space available.
Removal and Inspection
- The camshaft, cam followers, and rollers can be visually inspected by
removing the inspection covers on the side of the block. Unless damage is
apparent, there will normally be no need to remove the camshaft from
the block until the scheduled settled interval maintenance check. Removal
procedure is as follows:
- Remove the camshaft inspection covers.
- Remove the timing gear cover and any auxiliary equipment at the timing gear
end.
- Remove the valve train rocker arms and push rods (Refer to Section 4.1).
- Remove the fuel injection pumps (Refer to Section 4.4).
- Remove the camshaft drive gear, then remove the camshaft through whichever
end of the engine has been deemed appropriate. If space is restricted and
the camshaft must be separated into two section for removal, slide the shaft
out through the block until the coupling joint is outside the block,
disconnect the two sections, and remove each section individually.
(Refer to Figure). Use care not to damage the camshaft bearing shells in
the block while removing the shaft.