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The factory service manual for Shovel and EV big twin
engines lists different size pinion and cam gears. We are recommending that
service manuals be used for reference. If you have changed cams and now
notice that your engine makes noise like lifters out of adjustment, the
noise is most likely a result of excessive pinion-cam gear backlash. There
are several possible techniques for reducing gear noise.
- Remove the stock cam gear and press it onto the
new camshaft. Stock gears will work OK with Andrews Products camshafts. To
press a new gear onto a camshaft, the center of the 1/4" keyway (in the
camshaft) must be exactly 180 degrees (21 teeth) from the pinion timing
mark on the drive gear.
OR
- Measure the stock cam gear and pinion gear (over
pins) as shown in the diagram. Write down the measurements.
- Now measure the new cam gear (over pins) and write
down that number also.
- Subtract the new gear size from the stock size.
- If the new cam gear is smaller than the stock gear
(for clicking), add the difference (from 4) to the size of the pinion gear
to obtain a new (larger) pinion gear size.
- If the new cam gear is larger than the stock gear
(for whining), subtract the difference (from 4) from the size of the
pinion gear to obtain a new (smaller) pinion gear size.
- Then match this size to a new pinion gear part
number in the H/D manual and install it.
- Remember to use the same size pins as the manual
lists for measuring your gears! (.108" D. or .105" D.)
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