S&S Cycle 2006-Up Gear Drive Cams for Harley-Davidson Twin Cam 88 Engines - Manual (Page 10)

10
4- Pushrod Adjustment Procedure For Tappet With HL
2
T Kit Installed.
A- Bring piston to TDC on compression stroke in the cylinder to be adjusted. Normally both tappets will be at their lowest point of travel.
B- Extend the pushrod adjustment, collapsing the lifter until the piston assembly is in contact with the HL
2
T spacer and the pushrod is tight. If
the tappets contain oil, as when the pushrods are readjusted after engine had been run, or if all of the oil was not removed during the HL
2
T
installation, extend the pushrod adjuster until the valve is open (about five additional turns of the adjuster screw). Allow 5 minutes for the
hydraulic unit to bleed down. If the pushrod can be turned with the fingers after bleed down the lifter is not completely collapsed and this
step must be repeated.
NOTE: Perform the operation on one cylinder at a time. Do not turn the engine until pushrod adjustments have been completed.
CAUTION
Turning the engine while valve is held off the seat could result in valve to valve contact or valve to piston contact, serious valve train
damage could occur.
C- Loosen the pushrod adjustment until the pushrod can be rotated with the fingers with slight drag. The pushrod now has zero lash.
NOTES:
Shortening pushrod adjuster an additional six flats or one full turn from zero lash often results ion quieter pushrod operation. This provides additional
•
travel for the hydraulic piston assembly, which can improve he ability of the hydraulic unit to maintain zero lash under normal operating conditions.
Lifters for Harley-Davidson® Twin Cam 88® engines require HL
•
2
T Kit 33-5339.
D- Tighten the lock nut and recheck the pushrod adjustment to insure that it is still correct.
E- Follow the same procedure for all four pushrods.
NOTES:
After a few hundred miles it is a good idea to recheck pushrod adjustment in a new engine as valve train may tighten up due to gasket compression and
•
valve seat wear.
Upon initial start up after the modification, HL
•
2
T equipped lifters may be somewhat noisy for 10-20 miles. If lifters are still noisy after 20 miles it is
recommended that the pushrods be adjusted ½ turns looser.
F- Replace any remaining parts removed to facilitate cam gear drive installation. Check engine oil level. Start the engine and check for leaks.
NOTE: Engine may require several miles at normal operating temperature for lifters to fill with oil and quiet the valve train. Our experience has shown that
lifters for Harley-Davidson® Twin Cam 88® engines are slow to fill.
SERVICE
If crankshaft or cam drive sprocket needs to be removed, S&S® recommends using a small wheel puller like NAPA #775-9064. Loosen and unscrew
the gear bolts until bolt flange is about .600” from the shaft. To avoid damage to the shaft internal threads, let the puller screw push against the head
of the gear bolt until the gear breaks free from the shaft.
For replacement purposes, camshafts and camshaft gears are available separately.
Use a hydraulic press to remove and install the camshaft gears. Always use new keys and make sure the correct gear is mated with the correct
camshaft. See Figure 5. Timing marks on the camshaft gears should face the cam lobes.
Figure 5
Timing marks face lobes