Cam chain sprocket alignment setting

[MikeP911]

Setting cam chain sprocket alignment per page 159, Wayne's book. The book is great but concerns about typos and max number of shims used in setting alignment.

On disassembly four shims on left; three on right. Using straight edge (checked against a milling machine table for true), my numbers come out such that the right takes two shims and left takes five to meet spec. triple+ checked. Five shims is pushing limits of how much of the cam shaft end fits into the sprocket. Are these shims within limits?

Second question: page 159 says shims are .25 mm. Micrometer/Pelican parts says .5mm. So take it the .25 is a typo. are there .25 mm shims?

Third, regards calculation of the left side measurement comparison with the IMS depth plus adder figure for the late cases (43.27mm) (figure 6-9 of book). Bottom left of p. 159 says to measure the left side, then add 54.8mm to the value. the left is the deeper side of the two cams. The numbers don't work unless I subtract 54.8 mm to make the comparison. The left side measurement minus 54.8mm is equal to the IMS depth (figure 6-9) plus 43.27mm. Is the book in correct or am I catawompus?

[theiceman]

I just spent a week doing this . I really didn't care much about number of shims and just went with my measuremants. I think I took one shim out of each side on reassembly , not even sure how many in there. I just used what I needed to meet spec.

yes shims are .50 - .25 is a misprint. measurement is +/- .25 so .5 is all you need.

you are correct and depend how you read it , you add 54.8 to you IMS measurement OR subtract 54.8 rom your left side sprocket measurement.

I found it easier when doing all the measuring and testing to write out a min and max range for both sides ( you can do this as soon as you make your IMS depth measurement )

there is actually a thread with the book corrections somewhere on this site if you look around a bit.