differences between a 90 and 91 front knuckle?
- Thread starter SHOman247
- Start date
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Dr. Tweak
Mad Scientist
I don't think there's a difference...
but what do I know?
but what do I know?
K-Dawg
SHO Member
No difference AFAIK.
RCM
Forum Sponsor
Knuckles are the same, but hub center of 1990-2/1/1991 is 7mm smaller than 2/1/1991-on.
Depending on the build date of your 1991, the 1990 hub may be exactly the same as what you have.
You can use either hub as long as you use the matching rotor, and you can press out/in either hub type in either knuckle to have a matched set.
TSB below.
Russ
RCM Automotive
http://home.earthlink.net/~rcm_automotive/
TSB 93-22-4
FORD:
1986-93 TAURUS
LINCOLN-MERCURY:
1986-93 SABLE
1988-92 CONTINENTAL
ISSUE:
The misapplication of front brake rotors may result in various front wheel and front brake concerns. The hub pilot hole diameters of front brake rotors, for use on vehicles built on or after 2/1/91 and before 2/1/91, are different. The rotors are NOT interchangeable.
ACTION:
Be certain that the correct front brake rotor is installed. Refer to the Parts Block in this article for proper usage.
The pilot hole diameter of the current rotor (2/1/91 and later) is 7mm (0.28") larger than that of the earlier rotor (before 2/1/91), refer to Figure 1.
Figure 1 - Article 93-22-4
If a before 2/1/91 rotor (F1OY-1125-B) is installed on a vehicle built on or after 2/1/91, the rotor will not seat over the hub properly causing the rotor and wheel to wobble.
This can cause...
l Loosening of the lug nuts
l Breakage of the wheel studs
l Brake drag
l Accelerated brake wear
l Brake roughness
l Vibration
If the later style rotor (F2DZ-1125-A) is used on the earlier vehicle, a wheel runout vibration may result.
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 301000, 306000, 390000
Depending on the build date of your 1991, the 1990 hub may be exactly the same as what you have.
You can use either hub as long as you use the matching rotor, and you can press out/in either hub type in either knuckle to have a matched set.
TSB below.
Russ
RCM Automotive
http://home.earthlink.net/~rcm_automotive/
TSB 93-22-4
FORD:
1986-93 TAURUS
LINCOLN-MERCURY:
1986-93 SABLE
1988-92 CONTINENTAL
ISSUE:
The misapplication of front brake rotors may result in various front wheel and front brake concerns. The hub pilot hole diameters of front brake rotors, for use on vehicles built on or after 2/1/91 and before 2/1/91, are different. The rotors are NOT interchangeable.
ACTION:
Be certain that the correct front brake rotor is installed. Refer to the Parts Block in this article for proper usage.
The pilot hole diameter of the current rotor (2/1/91 and later) is 7mm (0.28") larger than that of the earlier rotor (before 2/1/91), refer to Figure 1.
Figure 1 - Article 93-22-4
If a before 2/1/91 rotor (F1OY-1125-B) is installed on a vehicle built on or after 2/1/91, the rotor will not seat over the hub properly causing the rotor and wheel to wobble.
This can cause...
l Loosening of the lug nuts
l Breakage of the wheel studs
l Brake drag
l Accelerated brake wear
l Brake roughness
l Vibration
If the later style rotor (F2DZ-1125-A) is used on the earlier vehicle, a wheel runout vibration may result.
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 301000, 306000, 390000
rangerj
Active Member
Bizzy,
If you read this would you please highlight this thread. Remember the broken wheel lugs about a week ago? This TSB is important, given all the parts swapping our readers do, especially with the brakes. Just a suggestion for the safety of our readers and forum members. Many, many, thanks to MRMANN7. Jolly good SHO! rangerj
PS I know your Bizzy (pun intended), but I see this as an important safety issue.
If you read this would you please highlight this thread. Remember the broken wheel lugs about a week ago? This TSB is important, given all the parts swapping our readers do, especially with the brakes. Just a suggestion for the safety of our readers and forum members. Many, many, thanks to MRMANN7. Jolly good SHO! rangerj
PS I know your Bizzy (pun intended), but I see this as an important safety issue.
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