Dt 570 And Ht 570 Engines Only; Method One - Using A Feeler Gauge; Method Two - Using A Dial Indicator - Navistar INTERNATIONAL DT 466 Service Manual

DT 570 and HT 570 Engines Only

Method One – Using a Feeler Gauge
1. Rotate the engine to approximately TDC (Top
Dead Center) compression on No. 1 cylinder (no
valves open). Set the lash on the No. 1 intake
valve to the nominal lash setting of 0.48 mm
(0.019 in).
Figure 211 Checking Engine Gear Train Timing
1. Straight line dimension
2. Radial distance dimension
3. Scribe mark
4. Damper timing notch
2. Scribe a mark on the damper pulley at a radial
distance of 100.0 mm (3.94 in) or a straight line
distance of 97.8 mm (3.85 in) clockwise from
the timing notch as viewed from the front of the
engine.
3. Place a 0.28 mm (0.011 in) feeler gauge between
the rocker arm and the valve bridge of the No. 1
intake valve. Slowly rotate the engine forward
(clockwise) until the intake valve starts to lift and
the feeler gauge becomes tight. The mark should
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
FRONT COVER AND RELATED COMPONENTS
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
line up with the TDC arrow on the front cover or
be within 3.5 crankshaft degrees of it. 3.5 crank
degrees is equivalent to a radial (or straight) line
distance of 8.1 mm (0.32 in) at the damper pulley.
NOTE: One tooth "out of time" on the gear train equals
approximately 11 degrees of movement or 21.4 mm
(27/32 in) of radial distance of damper pulley.
4. If the timing on the No. 1 valve is within
specifications, the other valves, barring extreme
camshaft lobe wear or poor adjustment, will also
be in time.
removal of the front cover is required to inspect
the punch marks on the gear train.
Method Two – Using a Dial Indicator
1. Adjust the No. 1 intake valve with the No. 1 piston
set at TDC (Top Dead Center) compression stroke
to 0.48 mm (0.019 in). Install a 0.28 mm (0.011
in) feeler gauge between the rocker arm and the
valve bridge of the No. 1 intake valve.
2. Position the magnetic base dial indicator on the
valve cover fence of the cylinder head rail with the
indicator tip on the No. 1 intake rocker arm tip.
3. Zero the dial indicator.
4. Rotate the
revolution in either direction to a position 360
degrees from starting point.
5. The dial indicator should read within the range of
0.13-0.25 mm (0.005-0.010 in) from the starting
position for proper gear train timing.
6. If dial indicator readings are found to be outside of
this range, removal of the front cover is required
to inspect the punch marks on the gear train.
EGES-265-2
If timing is found to be incorrect,
engine approximately
163
one full