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SETTING PRELOAD ON WINDSOR V8 HYDRAULIC
LIFTERS
Submitted by macx / 09-08-04
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(Cam, Lifters, Pushrods, Rocker Arms, Valve Springs Installed)
- Make sure lifter is on base of lobe (no lift).
- Make sure pushrod is seated in lifter and rocker arm.
- Make sure lifter plunger is not depressed or collapsed
or locked up.
- Make sure dial indicator plunger is parallel to pushrod.
- Make sure fixture clamped to pushrod is secure and
does not flex.
- Set dial indicator to 0.
- Tighten down rocker.
- For stud rockers, until dial indicator shows
desired preload (Crane recommends min .020" to
max .060").
- For pedestal rockers, tighten until snug (add or
subtract shims under pedestal to achieve desired
preload).
- Check rocker arm travel & contact points on valve
stem tip at closed and open. (Adjust rocker height and/or
pushrod length as necessary to achieve basically equal
travel on each side of center of valve stem tip, keeping
within lifter preload range.) Color valve stem tip with
magic marker then rotate engine through one lift and
close cycle for that valve to see travel pattern across
valve stem tip. (See Crane Cams website for detailed
instructions.)
To avoid having to spin the engine
over multiple times to get the lifters on the flat side of the cam
lobe, these instructions come right out of the Ford factory service
manual for the 5.0 HO.
(First, make sure your TDC mark on the damper aligns with the
TDC mark on the timing tab when the #1 piston is at true TDC.
There are a number of ways to check this. The best is with a
degree wheel and some type of device to stop the #1 piston travel
some distance before it reaches the top (called a "positive stop").
Instructions for finding true TDC can be found on some cam companies
websites or by doing a search on the internet.)
Rotate the engine so the #1 piston is at TDC at the top of the compression
stroke. Adjust the following valves:
#1 intake #1 exhaust
#4 intake #3 exhaust
#8 intake #7 exhaust
Rotate the engine clockwise 180 degrees (1/2 revolution) Adjust the
following valves:
#3 intake #2 exhaust
#7 intake #6 exhaust
Rotate the engine clockwise 270 degrees (3/4 revolution) Adjust the
following valves.
#2 intake #4 exhaust
#5 intake #5 exhaust
#6 intake #8 exhaust
A timing tape for your specific model and size damper helps to accurately
identify these spots.
An alternate method is to carefully align a straight edge across the
center of the damper from the TDC mark, aligning on the center of
the damper bolt, and make a mark on the damper opposite the TDC mark.
This will be the second position when aligned with TDC on the timing
tab. Then, while holding that straight edge in position, position
a small square along that straight edge, aligning the corner of the
square over the center of the damper bolt, and make a mark on the
damper at 90 degrees clockwise from TDC, or ¼ revolution past TDC.
This will be the final position when aligned with the TDC mark on
the timing tab.
- macx
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