Buy a Industry Specific Head Bolt Repair Kit for $450 & Up or Use This Head Bold Thread Repair Method for Nigh $xc

Nosotros become a lot of calls from people who go to put their cylinder head(s) back on the engine (aluminum block) and the threads strip while trying to torque the head bolts. Let's talk most the different threads first. Standard "shelf detail" metric bolts are 6MM, 8MM, 10MM, 12MM etc., all fifty-fifty numbers. The auto manufactures sometimes use the odd number metric threads on some of their fasteners, 5MM, 7MM, 9MM, 11MM etc. Because of that, the people who make thread repair kits accept those sizes. Here's the rub: most of the threads are recessed downwardly in the block, usually 35MM (i three/8") to 51MM (2"). The thread repair kits won't go down that far. You can purchase a Fourth dimension-Sert kit specifically designed to exercise this very repair for a meager $415.34 and it includes free aircraft! Or you lot tin can exercise it this way and spend less than $40, and it's easy. If you thread the top of the cake with a 11MM/1.5 thread pitch, our case below, yous can't buy replacement bolts that are 11MM X 1.5 pitch the correct length (that we could observe) to bolt the head to the block. We install 7/xvi" thread repair inserts instead. They are virtually the aforementioned size, .433" versus .437" and we tin can buy the bolts in ¼" increments. If I've confused you, the following instance should articulate information technology upwardly.

This case is a 2001 Toyota Camary 2.four liter DOHC and the Hondas are very similar. I'm not picking on Toyota or Honda. If we were discussing an in-line aluminum BMW half-dozen cylinder block, I'd beginning out saying program on re-threading the block before yous even accept it apart (information technology's 12MM 10 i.v and you can still use the OE head bolts).

The manufacturing plant caput bolt approximately 6 ½" long, 11MM X 1.5 thread pitch. The threads in the block don't first until approximately 2 ¼" downwardly from the deck of the block, four ½" from the head bolt hole in the head.

This is the mill caput bolt:

Here is the new head commodities:

head bolt thread repair

time sert head bolt repair

The reason I showed the tap with the new caput bolt is a few people accept non threaded the pigsty deep enough. The tap is tapered at the beginning to get it started. If you lot don't thread it deep enough the bolt gets tight at the bottom and you can't get the right head torque, called "clamp load" on the head gasket.

Hither'due south what you need:

  1. 1-7/16″x 14 TimeSert kit P/N 0761. The inserts that come with kit are not long enough, order P/N 076135 (1″ long) as many as you need( a couple extra probably a good idea).  Here is the installation video link if you lot similar: http://www.timesert.com/html/install.html#1
  2. Installed properly you don't need loctite. Nosotros buy from Neal @ Mechanics Tools, here'southward the link:  http://www.mechanicstoolsandbits.com/
  3. Lastly the bolts you demand are "Grade viii Socket Head Cap Screws". We by the from McMaster-Carr. Hither is the link:  http://www.mcmaster.com/#socket-head-cap-screws/=121vu66 .

 About 11 MM applications have 4″ long, total size such as Camry, Accord etc. Some of the 10 MM applications take 3 1/ii″ long such as Civic, Corolla etc.

Here is the block earlier the repair:
Block Before Repair

Here it is with the insert installed:
Block With Insert Installed

The drill size for the insert is 29/64" (.453"). Since the holes are already .465", we didn't even have to drill them. Be sure to utilise thread cut fluid or light oil when tapping the threads. Make clean the threads with Brake-Kleen or equivalent earlier using Loctite. In this case you don't have to worry about where the fries go, these are dead terminate holes (every bit most are) pregnant they tin't practice whatever harm at the bottom of the pigsty.

Let the Loctite dry overnight before yous gather. Thread all the bolts all the way through the insert by paw. If there is a bind, remove the insert, re-tap the hole and install a new insert. You lot tin remove the insert by grabbing the end of the peak tip of the insert with a pair of needle nose pliers, turning it clockwise wrapping information technology around the needle nose and screw the insert out.

The entire job won't have more than an hour or and then. Once you practice the offset i or 2, the remainder will become easy.

Hope this helped,
John