REG. CODE
1-5302-351
MODEL N°
50563
DATE OF ISSUE
04.90
REVISION 04
DATE
15.11.99
ENDORSED
COMPILER TECO/ATI
36
TIMING PULLEY - REFERENCE MARKS
All LDW-FOCS engines (502, 602, 903, 1204 and 1204/T) utilize the
same camshaft timing pulley. The cam timing of the LDW 502
however, differs from the other LDW-FOCS engines. Carefully review
the diagram to the left and the chart below to assure the correct
timing marks are used with respect to the engine model.
TIMING BELT INSTALLATION- TIMING PROCEDURE
With reference to the Crankshaft Timing Pulley section on the
previous page, align the crankshaft timing pulley mark with the TDC
reference mark on the oil pump housing. Align the camshaft timing
pulley with the timing reference mark as detailed above.
Loosen the timing belt idler pulley (see page 24). Orient the new
timing belt with the directional marks(A) as shown. Install the timing
belt onto the engine routing the timing belt over the crankshaft pulley,
over the camshaft pulley, over the coolant pump pulley and finally
around the idler. Push the timing belt against the back of the
crankshaft pulley and align the timing belt on all other pulleys. Pivot
the timing belt idler by hand and slightly tension the belt. Hand
tighten the tensioner nut, then loosen the nut by 1/2 turn.
TIMING BELT TENSIONING PROCEDURE- SETUP
Position belt preload tool 1460-049 (1) over the timing belt idler
adjustment ear (2). The tool should be oriented so that parallelism
with axis (B) is attained.
TIMING BELT TENSION PROCEDURE
Position a torque wrench as shown, engaging the 1460-049 tension
tool. The torque wrench axis (A) should be 90° from axis (B) as
shown above. Tension the belt by applying a torque of 30 Nm. While
holding the torque at 20 Nm, tighten the idler nut (3) securely. Torque
nut (3) to 40 Nm.
Rotate the engine in the normal direction of rotation (CW when
viewed from fan end of engine) three(3) complete revolutions to allow
the timing belt to “seat” and to align perfectly.
Repeat the above procedure two(2) times, including rotating the
engine to allow complete and confident tensioning.
1 Timing Reference Mark on Cylinder Head.
2 Camshaft Pulley Timing Mark- LDW 502 Only.
3 Camshaft Pulley Timing Mark- LDW602,702,903,1003,1204,1404 and 1204/T
DISASSEMBLY/REASSEMBLY
II
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