LOCATING TOP CENTER COMPRESSION
POSITION FOR NO. 1 PISTON
No. I piston at top center (TC) on the compression
stroke is the starting point for all timing procedures.
NOTE: The engine is seen from the flywheel end
when direction of crankshaft rotation is given.
1. Remove the valve cover.
Use a 1 1/8 inch socket on the front crankshaft
pulley bolt and rotate the crankshaft clockwise
approximately 30 degrees. The reason for this
step is to be sure the free play is removed from
the timing gears when the engine is put on top
Remove the plug from the timing hole in the
flywheel housing. Rotate the crankshaft until a
3/8"- 16 NC bolt, 50.8 mm (2.00 in.) long, can
be turned into the flywheel through the timing
hole in the flywheel housing. No. I piston is now
on top center.
NOTE: If the crankshaft is turned beyond top center
do Steps 2 and 3 again.
4. The intake and exhaust valves for No. 1 cylinder
will be closed if No. 1 piston is on the compres-
sion stroke. You can move the rocker arms up
and down with your hand.
5. If No. 1 piston is not on the compression stroke,
remove the timing bolt and rotate the crankshaft
counterclockwise 360°. Install the timing bolt.
The No. 1 piston is now at top center on the
TESTING AND ADJUSTING
CHECKING TIMING BY
FUEL FLOW METHOD
1P540 Flow Checking Tool Group
5P6524 Engine Timing indicator Group
9S215 Dial Indicator
958883 Contact Point, 12.7 mm (.50 in.) long
6V2056 Rod, 130.00 mm (5.118 in.) long
6V2057 Contact Point
6V2023 Flow Checking Adapter
MEASUREMENT OF PISTON TRAVEL
1. 3P1565 Collet. 2. 9S215 Dial Indicator and 9S8883
3. 5P7266 Adapter. 4. 6V2056 Rod,
130.00 mm (5.118 in.) long. 5. Cylinder heed. 6. Inlet
port. 7. Piston.
The fuel flow timing method is the most ac-
curate method to check the timing of the engine.
The distance of piston (7) from top center when
inlet port (6) just closes can be determined by the
use of the procedure that follows. Use the chart
to find the conversion of dial indicator reading to
NOTE: The fuel flow method CAN NOT be used
with 3300 Series Direct Injection engines that have
21 or more degrees BTC timing.
NOTE: The fuel system timing has a tolerance of