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| | |-+  NOS Idler Arm vs Factory Original
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Author Topic: NOS Idler Arm vs Factory Original  (Read 1573 times)
Edgemontvillage
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« on: June 26, 2013, 02:07:13 PM »

I just purchased an NOS idler arm for my '69 Z. I have read there are some differences between the factory originals and NOS service replacements however the part I received was "missing" the cotter pin hole which struck me as a manufacturing defect. I was later told that NOS idler arms used an oval locking nut rather than the common castellated nut and cotter pin combination. Can anyone validate this observation?










 
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Lloyd
1969 RS Z/28 10 10 Preservation
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« Reply #1 on: June 28, 2013, 06:43:01 AM »

Takes an 18 mm prevailing torque nut. Uses no cotter pin. Was the last design idler arm. GM part number 14083585 Group 6.895

                                                                                                 - Warren
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69Z28freak
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« Reply #2 on: June 28, 2013, 11:04:51 PM »

Takes an 18 mm prevailing torque nut. Uses no cotter pin. Was the last design idler arm. GM part number 14083585 Group 6.895

                                                                                                 - Warren

I tested the thread on this idler arm and it is a 12 mm coarse thread.
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Mike 1969 Grandma Camaro
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« Reply #3 on: June 29, 2013, 01:50:57 AM »

Lloyd does the NOS idler arm have a 'C' or an 'O' stamped in between the 2 frame mounting holes?
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Tim - New South Wales, Australia
04A VN '69 z/28 69-69 715 ex-E/MP
Hans L
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« Reply #4 on: June 29, 2013, 11:38:47 AM »

Here's a close-up of the idler arm from my Z (04B, Van Nuys Build).   Note hole for cotter pin and "C" stamp.  Car had about 70,000 miles on it, all SoCal.  No reason to believe it or any suspension components were replaced (many still had original factory markings).

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http://www.littooy.com/hans/
'69 Camaro RS Z/28 Van Nuys Built
Edgemontvillage
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« Reply #5 on: July 01, 2013, 01:18:08 AM »

Lloyd does the NOS idler arm have a 'C' or an 'O' stamped in between the 2 frame mounting holes?

The NOS arm isn't stamped on either side of the bracket that bolts to the frame.
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Lloyd
1969 RS Z/28 10 10 Preservation
68camaroz28
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« Reply #6 on: July 01, 2013, 07:51:15 PM »

Our 68Z has an "O" stamped idler arm.
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
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67rs/ss350 68z/28
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« Reply #7 on: July 02, 2013, 08:13:21 AM »

My 04D 68Z has the letter "C" stamped idler arm
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1968 Z28
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« Reply #8 on: July 02, 2013, 12:57:00 PM »

My 1968, 07C, Z28 has a "C".
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Jerry G.

Z28-1968-07C-Norwood
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Boston14
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« Reply #9 on: July 07, 2013, 07:43:50 AM »

My 1969, 11D (68) SS has a "C".
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boston14

1969 RS/SS 350 Convertible
Dover White with Black Top and D90 stripe, Red Standard Interior
Edgemontvillage
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« Reply #10 on: August 01, 2013, 01:46:47 PM »

Thanks for the feedback and photos. Its clear the NOS Idler Arm I located is a later, service replacement and differs somewhat from the factory original.  I located a nice original and installed that instead.
 



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Lloyd
1969 RS Z/28 10 10 Preservation
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