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When removing the cylinder head (1.6L Chevette motor) for a valve job, one head bolt was a little difficult to remove. Nothing bad, just noticeable. Before reassembling, I cleaned the head bolts and the threads in the head as best I could. Then I ran the head bolts finger tight back into their original holes. The one that was a little difficult to remove would only go in about three turns before jamming. When I examined the head I could see damaged threads. Further, the threads are much shinier than the other threads. I wondering if the threads had been repaired before with Heli-Coil.
I will try running a thread restorer tap through and see if that solves the problem. Failing that, what next? Should I try using a Time-Sert bushing or go with a larger head bolt? The OEM bolts are 11mm x 1.5. Can I tap it out for a 12 mm bolt?
Dick, have you got Chevette service manual not Chilton’s but a GM book ? I have used helicoil with great results but not on a Chevette. Dan R
I too have had great results with Helicoil but you have to use the right drill and the correct tap. I think that they are supplied with the Helicoil kit. ?? (along with the coil insertion tool)
About 15 years ago, I went into a hardware store to get lag bolts and molly anchors for a shelving system that I was putting up. The owner asked why I wasn’t using the new “Blue Concrete screws”. I questioned whether they would work in a concrete wall, but he showed me his paint display with many hundred pounds of paint cans on a wall hung system.
You obviously did not need my recommendation of Heli-Coil. I had not heard of Time-Sert. Looks like it may be a better system. Thanks for the tip.Your Heli-coil kits do not come with the drill bit required.
The drill bit size required will be posted on the package, though.
Good luck.Bill Ascheman
Fiberfab Ford
Modified 5.0, 5sp., 4:11
Autocross & Hillclimb
"Drive Happy"To answer Dan R’s question, I only have a Haines repair manual for a Chevette.
The threads for one head bolt in the engine block are damaged and look like they have been repaired before. They are much shinier than the threads in the other holes. I ‘m guessing they were repaired using a Heli-coil repair kit.
I’m not sure how to proceed at this point, and am talking to as many folks as I can. My wife says that give me a tool and I will so something stupid with it. History is on her side.
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