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the spacer is behind the timing belt tensioner and i guess there was nipple that was there to take place of the now spacer? or is ther a spacer supposed to be there?
There isn't really a nipple and its hard to tell without seeing it. I suspect the block broke in such a way that installing just a helicoil would result in the tensioner being misaligned and the spacer is there to bring it back out.
When installed properly, helicoils are very strong and can be trusted to hold. However, as you are aware, this is a very critical area and failure will do some damage to the valves. It is certainly cheaper than the alternative, which would be to replace the block or entire engine.
Out of curiosity, how did the tensioner snap off? Did it do this when driving or was a shop replacing it and over tightened it? I've never seen one just snap off at the block.
the timing belt snapped and grabbed the tensioner and pulled it out of the block the heilcoil holds almost all the thread of the tensioner bolt bout like the last 2 threads, then its like a 3/8" spacer between the block and tensioner to give it correct alignment
Wow, thats a crazy one.
If the helicoil is properly installed and the tensioner is correctly aligned, this sounds like it should work. Of course, its hard to say with 100% certainty because I cannot see the repair.