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Corvette
C4 Forum
1988 Convertible for sunny day drives
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<blockquote data-quote="Tourmax" data-source="post: 173640" data-attributes="member: 5304"><p>Alrighty.</p><p></p><p>I managed to get the bolt out without destroying the lower intake manifold.</p><p></p><p>Lots of penetrating lubricant and lots of working it back and forth. Eventually, I managed to work the bolt up past the buggered up threads.</p><p></p><p>When I looked down in the hole, I could see two or three threads were buggered about halfway down. That was a good thing because it meant I had threads at the top to start a tap nice and square and there were threads in the bottom of the hole that were still solid that could hold the bolt when torqued. All I had to do was clean up those couple threads and it would be good as new again.</p><p></p><p>I pulled the throttle body off (had to to get the other t-stat housing bolt out) and was able to get a 3/8-16 tap in the hole. A bit of patience and some aluminum cutting oil and the threads were refreshed and serviceable again.</p><p></p><p>I ran a die over the bolt and cleared out a good amount of aluminum and “schmutz” from the base of the threads. Yep, someone had run that bolt in and galled the threads. Proof was the ratched aluminum packed into the the root of the bolt threads.Probably some careless mechanic with an air tool. Too much speed with steel in aluminum and you are 100% certain to gall up the threads. Hey, who cares right? It’s not like you have to take it apart next time. Get it done as fast as possible and get paid. Screw the next guy who has to take it apart, right?</p><p></p><p><img src="/styles/smilies-extra/extended-simple/shifty.png" class="smilie" loading="lazy" alt=":Shifty:" title="Shifty :Shifty:" data-shortname=":Shifty:" /></p><p></p><p>With that handled, I tested the old and new thermostats. Just takes some water on the store and a cooking thermometer. </p><p></p><p>Sure enough, the old t-stat didn’t start to crack open until 205-210F. New one cracked open at 195-200 and was wide open by 205-210F. The old one had drifted up in temperature, like they all do when they get too many miles on them.</p><p></p><p>Once cooled, I took the new t-stat over to the drill press and put two 1/16” holes in the face. The holes are small enough that they don’t impede the t-stat operation, but they will allow trapped air to cycle out of the block and into the rad where it can be vented away. I do this to all my t-stats. Time and experince has shown me that the cooling system just works better if you have these “steam relief holes” in it.</p><p></p><p>Then it all went back together. Every steel bolt that went into aluminum got a nice coat of copper antiseize, like every steel bolt in aluminum should to prevent galling and seizing.</p><p></p><p>With that done, I moved on to the wiper arms. Namely, they sat too high in the oark postion and the drivers side kept kissing the windshield side molding. After a good deal of fiddling around (adjusting the c4 wiper sweep is a major pita to get right) the wipers park down below the hood like they should and now there’s a good inch between where the wiper stops and the windshield molding.</p><p></p><p>I’m almost afraid to fix the next thing on this car. There seems to be no end to what some PO has f’d with....and generally made a mess of.</p></blockquote><p></p>
[QUOTE="Tourmax, post: 173640, member: 5304"] Alrighty. I managed to get the bolt out without destroying the lower intake manifold. Lots of penetrating lubricant and lots of working it back and forth. Eventually, I managed to work the bolt up past the buggered up threads. When I looked down in the hole, I could see two or three threads were buggered about halfway down. That was a good thing because it meant I had threads at the top to start a tap nice and square and there were threads in the bottom of the hole that were still solid that could hold the bolt when torqued. All I had to do was clean up those couple threads and it would be good as new again. I pulled the throttle body off (had to to get the other t-stat housing bolt out) and was able to get a 3/8-16 tap in the hole. A bit of patience and some aluminum cutting oil and the threads were refreshed and serviceable again. I ran a die over the bolt and cleared out a good amount of aluminum and “schmutz” from the base of the threads. Yep, someone had run that bolt in and galled the threads. Proof was the ratched aluminum packed into the the root of the bolt threads.Probably some careless mechanic with an air tool. Too much speed with steel in aluminum and you are 100% certain to gall up the threads. Hey, who cares right? It’s not like you have to take it apart next time. Get it done as fast as possible and get paid. Screw the next guy who has to take it apart, right? :Shifty: With that handled, I tested the old and new thermostats. Just takes some water on the store and a cooking thermometer. Sure enough, the old t-stat didn’t start to crack open until 205-210F. New one cracked open at 195-200 and was wide open by 205-210F. The old one had drifted up in temperature, like they all do when they get too many miles on them. Once cooled, I took the new t-stat over to the drill press and put two 1/16” holes in the face. The holes are small enough that they don’t impede the t-stat operation, but they will allow trapped air to cycle out of the block and into the rad where it can be vented away. I do this to all my t-stats. Time and experince has shown me that the cooling system just works better if you have these “steam relief holes” in it. Then it all went back together. Every steel bolt that went into aluminum got a nice coat of copper antiseize, like every steel bolt in aluminum should to prevent galling and seizing. With that done, I moved on to the wiper arms. Namely, they sat too high in the oark postion and the drivers side kept kissing the windshield side molding. After a good deal of fiddling around (adjusting the c4 wiper sweep is a major pita to get right) the wipers park down below the hood like they should and now there’s a good inch between where the wiper stops and the windshield molding. I’m almost afraid to fix the next thing on this car. There seems to be no end to what some PO has f’d with....and generally made a mess of. [/QUOTE]
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Corvette
C4 Forum
1988 Convertible for sunny day drives
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