SPECIAL AR 3553423 - Caterpillar

Repair Procedure
Note: Tapping the holes is performed by using two separate taps. Refer to Table 4 and Table 5 for the correct taps.
Illustration 5 g01638134
Insert the reamer in the damaged main bearing hole.
Illustration 6 g01638137
Ream damaged bolt hole.Note: Reaming will be easier and quieter if cutting oil or a lightweight lubricating oil is sprayed into the hole at regular intervals.
Secure the modified end of the 8H-8559 Extension Assembly into the chuck of the 12.7 mm (0.50 inch) variable speed drill and then tighten.
The internal square end of the extension should be connected to the external square drive of the reamer.
Use a slow rotational speed to start reaming the damaged threads. Feed the reamer with moderate pressure.
After reaming to a depth of 25.4 mm (1.00 inch), stop the drill and remove the reamer.
Clean all chips and shavings from the hole by using compressed air. Continue reaming to the bottom of the hole. Remove the reamer and thoroughly clean all chips and shavings from the hole.
To avoid damage to the tooling, keep the reamer flutes free from metal shavings.
Illustration 7 g01638142
Chamfer the bolt hole.
Chamfer the hole by using a tool for metal chamfering or by using the 4C-3845 Grinding Wheel .
Clean all chips and shavings from the hole by using compressed air.
Illustration 8 g01638140
Thread the hole with the thread tap.
By using a handle for a tap, socket extension, tapping fluid or cutting oil, and the first tap, thread the hole until the pilot at the end of the tap bottoms.
Remove the tap for the first operation.
Clean all chips and shavings from the hole by using compressed air. Tap the hole by using the second tap.
Clean all remaining chips and shavings from the hole.
Clean the internal threads by using 138-8441 Brake Cleaner .
Dry the threads by using compressed air.
View the threaded hole by using a flashlight in order to ensure that there are no remaining chips.
Illustration 9 g01638273
(4) Installation sleeve
With the hex end of the installation sleeve (4), thread the installation sleeve (4) onto a clean main bearing bolt. Thread the installation sleeve (4) to the end of the threads. Then loosen the installation sleeve about one-half to three-fourths of a turn.
Illustration 10 g01638275
(5) Threaded Insert
Start threading the threaded insert (5) onto the same main bearing bolt. Refer to illustration 10.
Thread the threaded insert until the insert contacts the sleeve. Refer to illustration 11.
Ensure that there is a snug fit between the insert and the sleeve. There must be a snug fit between the insert and the sleeve.
Clean the threads on the outside diameter of the insert with 169-5464 Quick Cure Primer and allow the threads to dry.
Illustration 11 g01638278
Sleeve and threaded insert
Coat the threads on the outside diameter of the insert with 154-9731 Thread Lock Compound .
Illustration 12 g01638645
Screw the threaded insert into the block to the bottom of the tapped hole. Use a wrench in the hex of the installation sleeve. The installation sleeve should be tightened an additional thirty degrees.Note: Once the insert is started in the block, continue the installation until the insert