AEM 23-851BK Tru-Time Adjustable Cam Gear - Manual (Page 4)

b) Mechanical Tensioning
i) Insert a 8mm Allen wrench into the belt tensioner. Before rotating the
tensioner insert the long end of a 1/8” or 3mm Allen wrench into the pin hole
on the front of the tensioner. Rotate the tensioner counterclockwise with the
Allen wrench, while pushing in lightly on the 1/8” or 3mm Allen wrench, until it
slides into the locking hole. (Fig. 5)
ii) Remove timing belt.
Note: Do not rotate the camshaft once the timing belt has been removed or
damage to the valve components may occur.
3) Cam Gear Removal
a) Remove the cam gear retaining bolt, and slide the stock cam gear off the
camshaft.
b) Install the AEM Adjustable Cam Gear in the reverse process of removing the
stock cam gear.
c) Finger tighten the cam gear retaining bolt. Do not torque the cam gear
retaining bolt until the timing belt is installed. If you tighten the cam gear
retaining bolt before the timing belt is installed then damage to the valve
components may occur.
4) Timing Belt Installation (refer to step a or step b depending on the
model of your vehicle.)
a) Hydraulic Tensioner
i) Place the hydraulic tensioner into a vise that is equipped with soft jaws.
Slowly compress the plunger until the hole in the plunger lines up with the
hole in the tensioner body. Insert the metal rod that is supplied in the kit
through the tensioner body and plunger to retain the plunger in place until
tensioner is installed. (Fig. 6)
ii) Set the crankshaft sprocket to TDC by aligning the sprocket with the arrow on
the oil pump housing, then back off 3 notches before TDC. (Fig. 7)
iii) Set the camshaft to TDC by aligning the mark on the cam gear with the mark
on the rear timing belt cover.
iv) Move crankshaft to ½ mark before TDC for belt installation. (Fig. 8)
v) Install timing belt. Starting at the crankshaft, go around the water pump
sprocket and then around the cam gear.
vi) Move the crankshaft sprocket to TDC to take up belt slack. Install tensioner
to engine block but do not tighten fasteners.
vii) Use a torque wrench to apply 250 in.-lbs. of torque to the tensioner pulley.
viii)With torque being applied to the tensioner pulley move the tensioner up
against the tensioner pulley bracket and tighten fasteners to 275 in.-lbs.
ix) Pull tensioner plunger pin. Pretension is correct when pin can be removed
and installed.
x) Rotate crankshaft through two revolutions and check the alignment of the
timing marks.
b) Mechanical Tensioner
i) Set the crankshaft sprocket to TDC by aligning the sprocket with the arrow on
the oil pump housing, then back off 3 notches before TDC. (Fig. 7)
ii) Set the camshaft to TDC by aligning the mark on the cam gear with the mark
on the rear timing belt cover.