Originally posted by clmbia45
Dennis, I've been playing with this thing for 3 hours now (I'm a bit slow, ya know).
Working backwards I am now able to satisfy my self that Step 8.6 is incorrect.
In attempting to find what is absolutely true I have measured the various parts and how they work together.
The B measurement is fixed by the depth of the recess into the 1st gear pinion and the thickness of the thrust bearing and the bearing holder. Repeated measurement of this gives a value of B=1.03 mm
Now A=0.7mm+B or 1.73mm
This is close to what you get with the 0.5mm behind the collet, (1.83 mm, measured)
Now the calculated shim thickness is:
A-B-0.7 in mm = 0.1
IF YOU REDUCE THE VALUE OF "A" BY ADDING SHIMS BEHIND THE COLLET,TO TRY TO REACH THE GIVEN VALUE OF 1.3 MM, YOU WILL GET PROGRESSIVELY NEGATIVE VALUES FOR THE SHIM THICKNESS, BECAUSE "B" IS FIXED AT 1.03 AND THE DESIRED CLUTCH GAP IS FIXED AT 0.7MM.
I'm going to try 0.8mm of spring tension as in Step 8.3 and see how that works. By the way I notice that they picture a yellow brake shoe in the graphic, which might solve all our problems.
The figures on page 28 for A & B of the manual are only a guide not to be taken into cosideration.
1) First of all make sure that the gears on the clutchbell are tight enough. Assembell and dissasemble these a few times. Clean between each assembly.
2) Place only the 0.5mm shim behind the ""Brass cone"". Make sure you use the Brass one and not any other.
3) Assemble the clutch as described and record your A & B measurements, as per manual page 28.
4) Now the correct gap between the clutch shoe and the bell is 0.7mm. If its closer then your motor will bog down, and if too much then the clutch will have a delayed action and your clutch shoe wont last long as its just grabbing and may even slip too much. This is very important in the Centax Clutch. Get this wrong and you might as well use a electric car.
5) With these 2 measurements take the difference A - B = Clutch Gap 0f 0.7mm.
6) Find the right shims that will give you 0.7mm difference and then place them per diagram.
7) Say you measured 1mm for B and 3mm for A. then the difference will be 2mm. Now there is a total gap of 2mm. You must reduce this to 0.7mm for the right amount of clearance. So you must add 1.3mm of shims to achieve this.
8) Now add the smallest shims so that you minimise the endplay leave about 0.2mm gap.
9) You should always be able to spin the clutchbell when the motor is held verticaly with the clutch facing up or in the down position. If the clutch doesnt spin for at leat 5 seconds recheck your adjustments. Do this without any lubrication on the thrustbearing. Then when your happy lubricate the thrustbearing.
Set the spring collar as per manual. Try this. If it is still a little slugish as I doubt it will be then turn it clockwise 1/4 of a turn at a time and try it till the setting suits you.
You can do this without taking the motor out with a allen key if you didnt know. Just place the key in one of the holes on the clutch bell, locate the spring collar recess and turn.