Removal
1. See Figure 3-97. Secure the cam support plate in a vise with soft jaws.
2. Measurement between piston and bore in cam support plate:
a. With piston in place, insert straight stiff wire into bore until it bottoms in the piston.
b. Mark wire at edge of bore in cam support plate.
c. Remove wire and measure distance from the end to the mark. With piston fully seated in the bore, depth should be approximately 2.25 in (57.15 mm).
d. If it is less than specified, the piston is not fully seated and a low oil pressure condition will likely be the result.
3. Use a 1/8 in punch to remove roll pin (1). Discard roll pin.
4. Remove spring (2) and piston (3) from bypass port.
Inspection
NOTE
A stretched spring or sticking piston can result in high oil pressure.
1. Inspect spring for stretching, kinks and distortion.
2. Inspect piston and bore for burrs, scoring or other damage.
Look for steel particles or aluminum chips. Replace cam support plate and piston if any of these conditions are found.
3. Measure running clearance of piston in bore. If running clearance exceeds 0.003 in (0.076 mm), install new piston and measure again. Replace cam support plate if running clearance still exceeds specification.
Installation
1. Secure the cam support plate in a vise with soft jaws.
2. See Figure 3-97. Lubricate piston (3) with SCREAMIN’ EAGLE ASSEMBLY LUBE. Slide piston into bypass port of cam support plate with the open side facing outward.
3. Slide spring (2) into bypass port until seated in piston.
4. Start new roll pin (1) into hole in cam support plate.
Compress spring using the blade of a small screwdriver.
5. Hold spring compressed and tap roll pin into cam support plate until it approaches pin hole on opposite side.
6. Remove screwdriver to release spring. Verify that spring is straight and square in bore.
7. Use a 1/8 in punch to install roll pin until flush with casting.
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