Case Series C - Tappet Adjustments (Four Cylinder)

22-25
LOCATING TOP DEAD CENTER AND TAPPET ADJUSTMENTS
Four Cylinder 267B, 301 B, 3368D and 336BDT Engines
Firing Order ------------------ 1-3-4-2
The top dead center of No. 1 and No. 4 cylinders are found and indicated by aligning the TDC mark
on the crankshaft pulley and the timing pointer on the timing gear cover, Figure 35, or by the TDC
mark on the flywheel with the timing pointer in the flywheel housing located on the fuel filter side of
the engine, Figure 36.
- /"111'\
IMING POINTER
~u
I
TDC MARK
CRANKSHAFT PULLEY
Figure 35
0
FLYWHEEL
TIMING POINTER
0
FLYWHEEL HOUSING
Ir " I
Figure 36
The tappet adjustments can be done in two steps as described in the following manner.
COLD SETTING
STEP 1 - Remove the valve covers. Crank
the engine until the timing pointer is aligned
with the TDC mark. Check the push rods on
No. 1 cylinder for looseness. Ifthepushrods
are loose, No. 1 cylinder is at TDC on the
compression stroke. If the push rods are
tight, crank the engine one complete revo-
lution and align the pointer and the mark.
Check and adjust the following valve
clearances; intake valve at .015" clearance
on cylinders 1 and 2, the exhaust valves on
cylinders 1 and 3 at.025"clearance,Figure 37.
4
3
2
1
E I I E E I I E
~~FAN.
................
NO. 1 TDC COMPRESSION STROKE
Figure 37
STEP 2 - Crank the engine one complete
revolution and align the timing pointer and
the TDC mark. Cylinder No. 4 should be at
TDC on the compression stroke. Check the
push rods on No. 4 cylinder for looseness.
Check and adjust the following valve clear-
ances; intake valves at .015"clearance on
cylinders 3 and 4, the exhaust valves on
cylinders 2 and 4 at .025"clearance,Figure 38.
4 3 2
1
El IE El IE
~~FAN._
~~ .,.
................
NO. 4 TDC COMPRESSION STROKE
Figure 38
HOT SETTING
STEP 3 - Follow steps 1 and 2 while the
engine is hot. The tappet clearances for hot
settings are .015" for the intake valves and
.020"for the exhaust valves.
Install new cylinder head cover gaskets,
the valve covers and breather tube. Torque
the valve cover nuts 60 to 70 inch lbs. Do
not over torque.