centrifugal advance checking gauge
to check advance of all 2cv engines videos below
The checking gauge with the different angles The pointer attachment
The complete gauge attached to the camshaft.
RED line is the 6 degree point. The flywheel has to be turned to put the pointer in line with the zero line just above it.
DARK BLUE point is the lowest part of the cam lobe. The screw must be lightly tightened.
LIGHT BLUE line, points to a metal limit stop. There are 2 of them, one at the top and one at the bottom. These are adjusted up or down
with a pair of thin nosed pliers, to be in exactly the same position as each other to either increase or decrease the angle on the gauge specific for your engine.
The gauge is showing an angle of 6 degrees, so the flywheel must be turned to put the pointer onto the zero line to begin the test. The 4 cuts in the tool indicate 6, 8, 13 and 15 degrees. When the tool is set at zero, move the pointer anti clockwise until it stops and read off the angle. Adjust the limit stops as necessary.
These are the angles specific for each type of engine.
425 A type and AU type..............................16 to 19 degrees.
425 AZ and AZU type..................................11 to 14 degrees. Flat topped pistons.
425 AZ and AZU type..................................6 to 8 degrees. Convex topped pistons.
435 A53 [435] type and M4 [602cc]...........8 degrees.
602 A 79/0 type [602]...................................12.5 degrees.
602 A 79/1
602 M28
602 M28/1..................................all 3 types...15. degrees.
These angles are the maximum allowed for any specific engine, anything set differently will impact on its performance.