Hey,
We fixed the top end on this motor and went to put it back together. One of the holes was real tough to turn a bolt in so we tapped it. Well, a lot of metal came out with the tap which made us real nervous. Sure enough, the threads gave out when bringing the bolt to final torque. The bolt now turns freely in the hole.

Now what? I called Honda parts asking them what helicoil to use and they didn't seem to know what I was talking about and recommended a new engine. A local machine shop couldn't find the bolt specs in his book either. I think I can fix it if I can get the correct helicoil. The only complication is, I don't know how I should tap the block for the helicoil since the threads are recessed into the block, is there anything special I have to worry about or should it be ok?

 

Only real chance I see of this being saved is a heli-coil. Is it any of these bolts?:

 

Yeah, it's the #12 bolt in that pic, and it's the one that is to the left of the #2 exhaust port.

 

So is there any way to find out the specs on that bolt?

 

I emailed Time-sert to see if they knew the right one, we'll see.

 

do u not have the bolt anymore? u can just measure the bolt size adn pitch off the bolt.

 

The project is 100 miles away from me at the moment.

 

Not a Honda dealer but Timesert finally got back to me. The bolt is M12x1.5 according to them. They claim that the Honda Odyssey kit should work. What do you think?
http://www.timesert.com/html/honda.html