1967 Turn Signal Cancelling Cams (standard vs telescoping column)

[Bob S.]

Hi Folks - Wondering whether the attached cancelling cam pictures are correctly identified (or are possibly reversed?) for a standard vs a telescoping column.

I see them identified as standard (ref picture SC-47 - white cam) and telescoping (ref picture SC-591 - black cam) on the websites of 3 popular Corvette part suppliers.

The '67 Coupe I bought about 8 months ago has a standard column, but contains a cancelling cam that appears like the one shown for the telescoping column, and am wondering what gives......

Thanks in advance for any insight you can provide.

Regards,
Bob S.

[John H.]

Re: 1967 Turn Signal Cancelling Cams (standard vs telescoping column)

Bob -

When I had my '67 standard column apart five years ago to paint it, I remember that my cancelling cam is black also.

[Donald O.]

Re: 1967 Turn Signal Cancelling Cams (standard vs telescoping column)

I have resurrected this old thread as I am also in the same boat. The vendors all say the white is for standard and the black is for the telescoping. My standard column in my 67 has the black cam. The cam action is fine but the horn's spring loaded contact is shot.

So is there a dimensional difference between the two cams?

Don

[Joe L.]

Re: 1967 Turn Signal Cancelling Cams (standard vs telescoping column)

I have resurrected this old thread as I am also in the same boat. The vendors all say the white is for standard and the black is for the telescoping. My standard column in my 67 has the black cam. The cam action is fine but the horn's spring loaded contact is shot.

So is there a dimensional difference between the two cams?

Don

Don-------

I believe the GM cams, whether for standard column or tele column, could have been either black or white. However, the correct cam for each application can be identified by features of configuration. The easiest feature in this regard involves the two "cogs" emanating from the periphery of the center round extension. Note that in the case of the two cams shown above, the white cam has cogs which are more closely spaced at about 25 degrees apart. This indicates the cam for the NON TELE column. Note that the black cam has "cogs" which are spaced much wider apart at about 170 degrees. This indicates a cam for the TELE column application. So, don't mind the color----mind the "cogs".

[Jim S.]

Re: 1967 Turn Signal Cancelling Cams (standard vs telescoping column)

I'm afraid that I am not going to be of much help. Saginaw supplied all the 1967 and 1968 Corvette steering columns (both standard and telescoping). They supplied all columns with a turn signal switch. Chevrolet supplied the cancelling cam, horn parts, steering wheel hub, etc.

From the steering column assembly drawing (the frontal view), all of those columns appear to have the same turn signal switch. But I cannot confirm the switch part number(s). From that same frontal view it appears that the plastic switch tangs (that do the actual cancelling by engaging the canceling cam) were at the same locations for all those steering columns.

(Note, that later design turn signal switches had small torsion springs that did the canceling as compared to those delicate plastic tangs.) Since Chevrolet supplied the cancelling cam, any change in location of those "cogs" that Joe mentions, would require a steering column part number change since the switch and canceling cam must track each other. I just don't seen any picture differences in the switches from 1967, 1968, standard, or telescoping.

Unfortunately, the Saginaw switch expert just recently died. So another source of component design history is no longer available.

Jim

[Joe L.]

Re: 1967 Turn Signal Cancelling Cams (standard vs telescoping column)

I'm afraid that I am not going to be of much help. Saginaw supplied all the 1967 and 1968 Corvette steering columns (both standard and telescoping). They supplied all columns with a turn signal switch. Chevrolet supplied the cancelling cam, horn parts, steering wheel hub, etc.

From the steering column assembly drawing (the frontal view), all of those columns appear to have the same turn signal switch. But I cannot confirm the switch part number(s). From that same frontal view it appears that the plastic switch tangs (that do the actual cancelling by engaging the canceling cam) were at the same locations for all those steering columns.

(Note, that later design turn signal switches had small torsion springs that did the canceling as compared to those delicate plastic tangs.) Since Chevrolet supplied the cancelling cam, any change in location of those "cogs" that Joe mentions, would require a steering column part number change since the switch and canceling cam must track each other. I just don't seen any picture differences in the switches from 1967, 1968, standard, or telescoping.

Unfortunately, the Saginaw switch expert just recently died. So another source of component design history is no longer available.

Jim

Jim-------


That jives with my information. The turn signal switch was a Saginaw part number. The cam, horn parts and hub were Chevrolet part numbers. The switch, used for both standard and tele was GM #5698520. This is, of course, a Saginaw part number but the switch was actually manufactured by Boyne.

There MAY also have been another switch alternately used. It was GM #7800482. This was a Delco-Remy-manufactured switch with a Saginaw part number.