Calculating Dampener Advance and Retard Marks

[Jogasz28]

I searched and found a Trig problem that looks like it'll do what I want. That is to be able to measure from the TDC mark to get a mark that will represent 6 degrees crankshaft advance and retard positions, which will set the cams at 3 degrees advance and retard.

This trig problem shows how to calculate the length from the
dampener timing mark to 6 degrees before and after TDC to set
intake and exhaust cams at 3 degrees when replacing timing belt.
_____________________________
Example Question:
Find the length of an arc in inches for a circle whose radius is 15 inches
and subtends a central angle of 45 degrees.

Answer:
The equation we want to use is s = r*t, where s is the arc length, r is the radius of the circle,

and t is the angle in radians. To get radians from degrees, we use the equation
radians = degrees*pi/180

1. we want to find s when r = 15 and t = 45*pi/180 = 0.785 radians.

Therefore,
s = 15*0.785 = 11.775 inches
______________________________


For the '95 Monte Carlo 3.4 Litre Engine Dampener:

Dampener Diameter = 6 & 11/16" ( measured with spring caliper)
= 6.6875"
Dampener Radius = 3.34375"

Want 6 degree (angle) Arc length:

t = 6 * PI / 180
= 6 * 0.01745327777777
= 0.104712 radians

s = 3.34375"(radius) * 0.104712
= 0.3501"
= 11/32" (0.34375")

So I need to measure and mark the dampener 11/32" after, or to the
right of the TDC notch to get the intake cam 3 degrees advanced.
Then mark the dampener 11/32" before, or to the left of the TDC notch
to get the exhaust cams 3 degrees retarded with the cam hold-down tool
installed and "cam flats up".
I'll go to advanced dampener mark, tighten the intake sprocket, then go to retard dampener position and tighten the exhaust cam sprocket.
Does this sound right?
If so, I'll be doing it this weekend.
jogasz28

[SappySE107]

Or just take the width of the mark, multiply by 6, and measure that far form the current mark and make a new one. That will give you 6/6 at the crank. Then line it up with the stock mark on the timing chain cover.