JG/EDELBROCK ADJUSTABLE CAM GEARS
• Please study these instructions carefully before installing your new sprockets. If you have any questions or problems, please call our Technical Hotline at: 1-800-416-8628, 7:00 am
– 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at
[email protected].
• DESCRIPTION: The JG Edelbrock adjustable cam gears #4720/4722 fit SOHC 1988-1995 Honda Civics. Each one-degree increment represents one degree of cam movement, which
is two degrees of crank movement. This is the industry standard. Because this product is adjustable it is legal only for use on racing vehicles that are never used on the highway.
• TUNING GUIDELINES: In general, advancing the cam will increase low and mid rpm power
and decrease peak horsepower. Retarding the cam has the opposite effect. Many applications benefit from advancing the cam 2-5°. Dyno tuning is highly recommended to obtain
the
maximum performance.
• RELATED PRODUCTS: Our growing Sport Compact product line includes everything from
headers and nitrous to high-performance manifolds and cylinders heads (available 2002). All of our products are designed to be the best in class, built with great attention to detail,
and tested on the dyno and at the track. To order a catalog, call 1-800-FUN-TEAM.
INSTALLATION INSTRUCTIONS
1) Tag and remove the ignition wires, and the wire clamp. Remove the rocker cover. Removing the spark plugs will make it easier to turn the engine over in step 8.
2) Remove the top section of the plastic timing belt cover.
3) To simplify the installation, turn the engine over to TDC on the number one cylinder (closest
to the driver’s side). The "up" letters on the stock cam sprocket should be up, and the timing
marks horizontal.
4) Inspect the timing belt for cracks or oil or coolant soaking and replace if present. Refer to your
service manual for replacement instructions. Wipe up any oil or solvent that gets on the belt while you are working on it.
5) Remove the tensioner access plug from the lower belt cover. Loosen (do not remove!) the belt
tensioner-mounting bolt.
6) Remove the cam sprocket mounting bolt and the cam sprocket. Be careful to not rotate engine
with the belt disconnected!
7) Install the JG/Edelbrock Sprocket using the supplied Woodruff key. Set the adjustment to zero
and tighten the socket head screws. Tighten the hub to cam bolt to 40 ft-lbs using blue Loctite
8) Rotate the engine 5-6 revolutions (counterclockwise when facing the engine pulleys) to seat the belt.
9) Tighten the tensioner-mounting bolt to 40 ft-lbs. If you can twist the belt more than 90° by hand,
the belt is too loose. If so, check to see if the tensioner is stuck by loosening the mounting bolt
and pulling up on the tensioner (use a bent hanger or hook).
10) Loosen the five socket head screws and adjust the gear to the desired timing position by turning the cam via the hub to cam mounting bolt. Tighten the screws using an allen wrench. When
set at 0°, our adjustable sprocket duplicates the stock cam timing. Not all adjustable gears use a true 0°.
11) Replace the belt cover.
12) Clean the valve cover seal surfaces on the head. If the seal is not cracked or hardened it may
be reused. Press it into the receiver groove in the cover.
13) Apply automotive sensor safe silicone to the four corner edges on the head seal surface where
the cam caps meet the head. Allow to air-dry for 10 minutes before installing the cover.
14) Tighten the cover to 8 ft-lbs in two or three steps.
15) Install ignition wires, cover and PCV hose.