TIME-SERT 1812CORE Rocker Bolt Hole Thread Repair Kit M8x1.25

Description

This thread repair kit is for rocker arm bolts on some GM 3.1 and 3.4 liter engines that have 8mm bolts. If the 10mm repair is needed see the 1015CORE. Tip: Don’t go by the head of the bolt to determine the the size of the bolt. Use a nut or die to see what threads on it, or measure with a digital caliper (micrometer). The 8mm will be approximately 7.80 mm and the 10mm will measure about 9.8 mm. 

This tooling has been used in rocker arm thread repair where the threads must start a few millimeters deep below a “Slot”. This kit is for “first time” repairs which means Heli-Coils or a different competing brand, were not used  previously. If a repair has been made before and this is the second repair, see the 1812CORE BS (Big  Sert) kit which is over-sized.The core drill countersink combination will have to set by hand.We use this special 4 flute core drill because it makes drillingthru a slot easy. Using a traditional 2 flute is difficult because the drillit wants to hang on the slot and break.

1812CORE Instructions Included:

KIT CONTENTS

1. Step Core Drill w/collar

2. Tap

3. Tap Guide

4. Insert Driver

6. Inserts pn 18125117N 11.7mm long qty-5

*Note, some GM engines use use a 10mm rocker arm bolt. Please verify your bolt size before ordering. If repairing the M10x1.5 hole use a 1015CORE Rocker Arm Bolt Hole Thread Repair Kit. 

Mouse over the images above for a more detailed view of the kit components. Also notice our bulk discount prices on TIME-SERT replacement inserts for thread repair kits. Need more information on TIME-SERT thread repair kits? Visit our auto repair blog section on thread repair kits for tips, advice and all your thread repair questions answered. Just comment and we will be quick to respond.

See the  TIME-SERT products pdf for more information on thread repair kits and inserts. Some are listed for certain applications on cars, trucks and motorcycles. The pdf is a partial application list so feel free to email or call if we can assist with your particular need. We also accept inquiries regarding our daily TIME-SERT specials. Remember TIME-SERT is recommended by leading car manufacturers like the General Motors Corporation. In fact TIME-SERT is GM’s only authorized repair for head bolt threads.