1999 2WD F250 with original alloy wheels. I am rotating my tires and want to torque the lugs. The owners manual says 100 ft lbs for 1/2"lugs (pg. 168) which I have. From what I have read that seems low. Most recommend 150 to 165? I do tow about 10k and would like to get it right.

 

Ok, I went out and used a caliper on the lugs. They measure 0.543 inches, which is bigger than half inch so will that make the lugs 9/16th? If so the torque value per the manual would be 140 ft l bs ??

 

Really only 100? My manual states 150.

m14= .550

Here is a what the hole page looks like. https://www.ford-trucks.com/forums/a...9&d=1295935504

 

m14 / 25.4 = .551.. M14 is what you have.

 

My book says
Bolt size 1/2-20 N*M 135 Ft-Lb 100

Bolt size 9/16-18 N*M 190 140 Ft Lbs

I have a early 11/98 1999 production if that makes a difference

 

1/2 =.500
9/16 would be .562.

So if you measured them with calipers and they are bigger than 1/2" in the range of 14mm or 9/16. I would go with 140 and not look back. My guess would be you still have 14m, I'm thinking from what you measured.

 

My manual is like Dan's (150-165 ft/lbs).
The manual also says to add one drop of motor oil between the flat washer and nut. This helps achieve more accurate torque readings.

 

Without pulling mine off and checking , i guess it could be 9/16 and my manual is wrong. But never the less the torque is in the same ball park. Can't find a source that shows it is indeed metric other than my manual.

 

I went ahead and torqued to 150 Ft Lbs... From what I have read Ford changed the torque values on the 1999 Unfortunately it did not tell me what the torque value was cnanged too?

Ford Issued Update for Lug Nut Torque wrote:

Special Field Action 02L11

Certain 1999 through 2002 Model Year F-Super Duty Vehicles, 1999 through 2002 F-53 Stripped Chassis Vehicles and 2000 through 2003 Excursion Vehicles - Wheel Lug Nut Torque Specification and Procedure Label


--------------------------------------------------------------------------------

Technical Information

WHEEL LUG NUT TORQUE — UPDATE OF OWNER INFORMATION MATERIAL

AFFECTED VEHICLES:
CERTAIN 1999-2002 MODEL YEAR F-SUPER DUTY AND F-53 STRIPPED CHASSIS, AND CERTAIN 2000-2003 MODEL YEAR EXCURSION


This program is comprised of two elements:

Installing a label onto the inside front cover of the vehicle Owner Guide. This new label provides updated lug nut torque specifications and installation procedures (applies to all affected vehicles).