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TIME-SERT J-42385-300 Cadillac Northstar Main Bolt Thread Repair Kit M10x1.5

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6.00 LBS
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  • TIME-SERT J-42385-300 Cadillac Northstar Main Bolt Thread Repair Kit M10x1.5
  • TIME-SERT J-42385-300 Cadillac Northstar Main Bolt Thread Repair Kit M10x1.5 free next day shipping.
  • TIME-SERT insert driver installation tool J-42385-513
  • J-42385-511 step drill with stop collar.
  • J-42385-512 thread tap for 42385-300 main bearing bolt thread kit.
  • J-42385-308 alignment pin and J-42385-307 alignment bushing.
  • J-42385-510 bolts to attach fixture.
  • 6020 permanent high temp loctite.
  • 6010 driver oil.
  • Alignment fixture J-42385-306.
  • Laminated instructions for the Time Sert J-42385-300
  • 101522 insert M10x1.5
  • TIME-SERT J-42385-300 case


Includes Free Shipping. *Note this is NOT for headbolts! The numbers are similar but this is for main bolt thread repair. The TIME-SERT J-42385-300 main bolt thread kit for 1996, 1997, 1998, 1999, 2000, 2001, 2002 & 2003 GM Cadillac Northstar 4.6 engines and the Oldsmobile 4.0 Northstar engine. It uses a steel bushing type insert that accepts a size M10x1.5mm (10 millimeter by 1.5 millimeter) main bolt. The Time Sert thread repair method is different from the popular Heli-Coil method, because it is held more securely (from the bottom) and uses a thicker insert rather than a coil of wire like the Helicoil. TIME-SERT is the GM Powertrain recommended thread repair procedure to fix aluminum blocks. Steel is ten times stronger than aluminum. 

*Note The J-42385-300 is for a "first time" repair which means it has never had a repair insert (like a failed Helicoil) or any other kind installed previously.

GM recommends TIME-SERT and is the only authorized repair from General Motors Corporation. The kit comes with a quantity of 10. The block takes a total of 20 inserts so it's important to purchase 10 more inserts to have enough to repair the whole block. As mentioned, TIME-SERT is the ONLY recommended repair for the Northstar.

Time Sert J-42385-300 Head Bolt Thread Repair Kit Includes: 

Qty  Tool Item Number

1      Drill Fixture 

1      Drill Bushing

1      Alignment Pin

3      Bolts

1      Step Drill

1      Tap

1      Insert Driver

1      6020 Loctite

1      6010 Driver Oil

10    101522 M10x1.5mm Replacement Inserts 

1      Laminated Instruction card.

pdficon-small.png See the Time-Sert J-42385-300 Thread Repair Kit Instructions pdf - Also see the YouTube video linked above for more tips for a proper repair.

*Note TTY head bolts should be replaced as per auto repair manual. Reusing old main bolts could cause repeat failure.

Cadillac Northstar Engines - A total of 20 inserts are needed and included for the Northstar engines if repairing entire block.

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 pdficon-small.png 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 and main bolt hole threads.

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3 Reviews

  • 5

    Nice Kit and Made in the USA!

    Posted by Kenneth E on 6th Nov 2015

    Exactly as described, great product and customer service.

  • 5

    Worked great

    Posted by Robert S on 15th Oct 2015

    Excellent kit and quick delivery. Saved my engine.

  • 5

    Excellent Thread Repair Kit!

    Posted by Robert S. on 22nd Aug 2015

    Excellent design in every way. Impressed with workmanship, couldn't have asked for a better thread repair kit for my Cadillac Northstar engine!

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