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In a head bolt situation a helicoil probably is not going to cut it. I would highly recommend pulling the block and having a machine shop do that particular repair. if you insist on doing it yourself I would recommend an insert called a time-sert.
http://www.ebay.com/itm/like/290964263372?lpid=82
Time-serts are better suited for high torque situations like head bolts, in that situation a helicoil will most likely pull out when you torque the bolts to yield. Unfortunately time-serts are also expensive, but I highly recomend you not skimp on this, loose headbolts is the last thing you want.
You should not try to repair the thread on a head bolt… You should use new bolts.. I believe that in 2004, all Toyota engine sizes used Torque to Yield (TTY) AKA “Stretch bolts”…
-Karl
[quote=”ToyotaKarl” post=81873]You should not try to repair the thread on a head bolt… You should use new bolts.. I believe that in 2004, all Toyota engine sizes used Torque to Yield (TTY) AKA “Stretch bolts”…
-Karl[/quote]
I might have read it wrong, I thought he meant he stripped the threads in the block.
I see why you thought that when he said Helicoil, but I wanted to cover his first statement about repairing the bolts….
I’m sure he will fill us in… :cheer:
-Karl
Helicoils are fine for fixing up oversize holes in aluminum, but in iron, not so good. You need something stronger and grippier than a little coil of wire. There are fancier inserts available but they might require some precise drilling out and retapping of the hole, which might be beyond the ability of the average car owner.
I’m with the group. If you need to repair the threads for the cylinder head bolts, it’s best to have a machine shop do the work. If however you are trying to repair spark plug threads then you also need to be very careful. Since spark plugs are a serviceable item. It’s not uncommon to unscrew the thread repair when you remove a spark plug. In fact, I had a car like this once. In the end I ended up replacing the engine after the spark plug came shooting out one day. I could have just replaced the cylinder head, but the engine had 326K on it, and I found a complete engine and trans for $600. It was kind of a no brainer. That said, you might also consider having a machine shop repair your spark plug threads as they are best equipped for that type of work. I think it’s better to fix it then put a band aid on it. Keep us posted.
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