As of 09/2004

When assembling the bolts use ARP assembly lube under the heads and on the threads and torque up to: -

RB3/RB3K  (3/8” UNF) ARP 2000 bolts –              43 lbft

RB4 (5/16” UNF) ARP 625+ (custom age) bolts   30 lbft

RB5/RB5K  (5/16” UNF) ARP 2000 bolts –            24 lbft

RB6 (5/16” UNF) High spec Multiphase bolts –            38 lbft

NOTE: - We cannot be held responsible for rod bolt stretch when an uncalibrated torque wrench has been used.

THE FOLLOWING NOTES ARE IMPORTANT.

ALWAYS wash the fasteners with cleaning solvent prior to installation.

They come coated with a “protective” coating, this is NOT a lubricant.

Choose correct torque from the list.

The method to follow for applying lubricant:

1.                  Coat the fastener with lubricant as evenly as possible.

2.                  Pull up the fastener so that it is ‘snug’.

3.                  Do ‘2’ three times, on the third time torque to the recommended torque setting.

The above method no doubt seems strange, but does ensure no metal to metal contact that increases friction between the threads.

The torque figures shown will give a preload equal to 75% of the yield strength of the fastener.

Use a generous chamfer on all bolt holes (1mm).

Do not use lock tabs. They are made from too soft a material and as it squeeze’s out the fastener preload is lost.

Due to leverage differences a fine thread will produce a greater preload for a given torque than will a coarse thread of the same diameter.

For all connecting rods check that the chamfer required to clear the bolt under head radius is adequate – this if VERY important.