sb23-01TMS

1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
SERVICE BULLETIN 23-01
TO: Customers/drivers, builders/repair shops & race teams
RE: Immediate and recurring inspection; torque setting & replacement of damaged cap bolts in
aftermarket Turner Motorsports front lower control arms: FLCA SKU’s: TMSFLCAG2X,
TMSFLCAE9X, TMSFLCAF3X, TMSFLCAF8X, TMSFLCAG8X
Effective Date: JULY 17TH, 2023 with cap bolt inspection, torque confirmation of 180/ft. Lbs or
replacement before further use.
Description of Issue: Turner Motorsports has received inquiries regarding bending and failures
of cap bolts used in Turner Motorsports front lower control arms. Information supplied to
Turner Motorsports indicates inadequate or un-retained torque of retaining nut/bolt to lower
control arm may be contributing to bending and fatigue of grade-8 fasteners.
Recommended Action: Visually inspect cap bolt and control arm attachment points for
bending, impact or other wear/distortion/damage; paying particular attention to the area where
cap bolt threads exit retaining nut:
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
Recommended Action (cont.)
Immediately Remove and Replace any cap bolt with signs of bending
distortion or damage! Do NOT drive the vehicle until it is properly repaired.
(contact Turner Motorsports for part number)
1. Clean threads and re-torque undamaged cap bolt retaining nuts to 180 ft-lbs (dry threads). Turner
Motorsports strongly recommends replacement of any cap bolts where inspection indicates
installed torque less than 110 ft-lbs, regardless of damage or time in use.
To check current installed torque, set a calibrated click-type torque wrench to 110 ft-lbs and
attempt to tighten the nut. There should be no rotation (additional tightening) of the nut before it
clicks. For beam-type torque wrenches, simply apply torque until it measures 110 ft-lbs, again,
there should be no additional tightening/rotation felt.
2. Apply permanent marking (via marker or other method) line on the nut(s) and adjacent
member(s) for visual indication that the torque value has been retained and no rotation has
occurred. (See images below)
3. Make inspection and confirmation of 180 ft-lbs torque setting part of your routine pre-use and
race preparations and maintenance.
Consult your Turner Motorsports instructions and
[email protected] for additional set-up recommendations, warnings and
product safety information.
4. The prevailing torque nuts without the nylon anti-rotation ring can only be tightened twice before
they should be replaced. Nylock style nuts should be replaced after three uses. Exceeding this
limit, even with proper torque values, can result in loosening.
Torque settings of cap bolt/control arm and other fasteners may change as a result of
vehicle use. Torque settings below 180 ft-lbs on Turner Motorsports cap bolt/lower control arms and
settings other than recommended for other suspension components may result in bending, premature
wear and failure. To reduce risks of accident and serious injury always:
● Routinely inspect OEM suspension and steering components, braking system and
Turner Motorsports components including control arms, fasteners, spherical bearings
and heim joints for indications of physical damage, overload stress, bending/distortion
(however, slight).
● Immediately remove and replace any OEM or Turner Motorsports component
or fastener with indicated or suspected damage (including bending or damaged
threads).
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
● DO NOT modify or substitute Turner Motorsports components. Use calibrated torque
wrench/ never impact or air tools or configure suspension settings outside of those
recommended by OEM, Turner Motorsports or established through owner testing of
vehicle.
Replacement Hardware Information:
Current Turner Motorsports kits ship with a stud & nut fastener that will retrofit to older
kits as replacement parts (See illustrations below).
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769
Visual Inspection Marks
1000 Seville Road
Wadsworth, OH 44281
[email protected] (978)338-7769