COMP Cams 6300 Hi-Tech Belt Drive Systems - Manual (Page 3)

COMP Cams®
3406 Democrat Rd.
Memphis, TN 38118
Phone: (901) 795-2400 Fax: (901) 366-1807
www.compcams.com
Part #188
Revised 3/14/08
cover, but the permanent mark made by a scribe may complicate future installations. NOTE: On some
aftermarket blocks and refaced OEM blocks, it may be necessary to alter the position of the timing cover
by adding or subtracting front cover gaskets.
Step 10: Replace o-ring on backside of endplay adjustment housing and attach housing to front cover using the
three supplied 1/4-20 x 1/2" button head cap screws. Place a small drop of low strength thread locking compound
on the cap screws and torque them to 10-12 lbs/ft.
Step 11: Install cam drive flange onto cam hub. Rotate flange 180 degrees if required
to align three holes in flange with threaded holes in hub. Use supplied 5/16-24 x 7/8"
Torx
™
head cap screws. Make sure bolts don’t bottom out. Apply a drop of low
strength thread locking compound and torque bolts to 18-20 lbs/ft (fig. 7). Use
screwdriver to hold flange.
Step 12: Rotate crankshaft so that the alignment mark on crankshaft pulley is straight
up (12:00 position) and turn camshaft until "0" mark on drive flange is pointed straight
down (6:00 position).
Step 13: Place belt in position with teeth engaged on bottom pulley and upper portion
laying flat against cover (fig. 8).
Step 14: Position red cam pulley over drive flange with degree
markings on bottom (at 6:00 position). Wiggle pulley (if
required) and push over studs (fig. 9). Install the supplied
stainless steel washers and 5/16-24 flange nuts finger tight.
Step 15: Rotate engine a minimum of two revolutions to get
belt properly seated and on centerline (fig. 10).
Step 16: Install belt tensioner pulley on mounting stud with
snap ring toward cover (fig. 11). You may have to push the
belt and wiggle the pulley to get it started. Attach pulley with
supplied 3/8-24 12-pt nut. Apply a drop of low strength thread
sealer and torque nut to 25-30 lbs/ft (fig. 12).
Step 17: The cam is now ready to be degreed per your
requirements. If the engine is in the short block stage, you can
set the No. 1 piston to Top Dead Center, and degree the
camshaft as you would with any other timing set. Note that
some engine builders prefer to advance cam an additional 1 to
1-1/2 degrees in order to compensate for belt stretch. When
the degreeing process is performed on a long block, there is
generally enough tension on the valve train to facilitate a
direct setting.
Note: The pulley is designed to provide up to 10 degrees of advance or retard. Should more than 10 degrees
be required to properly phase the cam, you must move the belt one tooth on the bottom (crank pulley) to
bring belt drive system into the next window of adjustment.
Step 18: When camshaft is degreed as desired, torque the cam pulley nuts to 18-22 lbs/ft of torque using low
strength thread locking compound.
Fig. 11