J 42385-850 Thread Repair Kit
The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type insert (1). During the bushing installation process, the driver tool expands the bottom external threads of the insert into the base material (2). This action mechanically locks the insert in place. Also, when installed to the proper depth, the flange of the insert will be seated against the counterbore of the repaired hole.
Caution: Wear safety glasses in order to avoid eye damage.
Important: The use of a cutting type fluid GM P/N 1052864 (Canadian P/N 992881), WD 40®, or equivalent, is recommended when performing the drilling, counterboring, and tapping procedures.
Driver oil MUST be used on the installer driver tool. The tool kits are designed for use with either a suitable tap wrench or drill motor.• | M6 inserts require a minimum drill depth of 15 mm (0.59 in). |
• | M8 inserts require a minimum drill depth of 20 mm (0.79 in). |
• | M10 inserts require a minimum drill depth of 23.5 mm (0.93 in). |
• | M6 inserts require a minimum tap depth of 15 mm (0.59 in). |
• | M8 inserts require a minimum tap depth of 20 mm (0.79 in). |
• | M10 inserts require a minimum tap depth of 23.5 mm (0.93 in). |
Important: Do not allow oil or other foreign material to contact the outside diameter (OD) of the insert.
Install the insert until the flange of the insert contacts the counterbored surface. Continue to rotate the installer tool (1) through the insert.
The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.
A properly installed insert (1) will be either flush or slightly below flush with the surface of the base material (2).
• | Drill (1) |
• | Tap (2) |
• | Installer (3) |
• | Sleeve (4) |
• | Alignment Pin (5) |
• | Bushing (6) |
• | Bolts (7) |
• | Fixture Plate (8) |
Caution: Wear safety glasses in order to avoid eye damage.
Important: The use of a cutting type fluid GM P/N 1052864 (Canadian P/N 992881), WD 40®, or equivalent, is recommended when performing the drilling and tapping procedures.
Driver oil MUST be used on the installer driver tool. The tool kits are designed for use with either a suitable tap wrench or drill motor.Position the fixture plate and bushing over the hole that is to be repaired (4).
Important: During the reaming process, it is necessary to repeatedly remove the drill and clean the chips from the hole.
Drill the hole until the stop collar of the drill bit or the sleeve contacts the bushing.
In order to tap the new threads to the proper depth, rotate the tap into the hole until the mark (3) on the tap align with the top of the drill bushing (2).
Important: Do not allow oil or other foreign material to contact the outside diameter (OD) of the insert.
Rotate the driver tool until the mark on the tool aligns with the deck surface of the engine block.
The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.
• | Drill (1) |
• | Tap (2) |
• | Installer (3) |
• | Fixture Plate (4) |
• | Long Bolts (5) |
• | Short Bolts (6) |
• | Alignment Pin (7) |
• | Bushing (8) |
Position the fixture plate and bushing over the hole that is to be repaired.
In order to tap the new threads to the proper depth, rotate the tap into the hole until the mark (3) on the tap aligns with the top of the bushing (2).
Important: Do not allow oil or other foreign material to contact the outside diameter (OD) of the insert.
Important: The fixture plate and bushing remains installed onto the engine block during the insert installation procedure.
Rotate the driver tool until the mark on the tool (3) aligns with the top of the bushing (2).
The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.