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Corvette
C4 Forum
1988 Convertible for sunny day drives
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<blockquote data-quote="Tourmax" data-source="post: 174270" data-attributes="member: 5304"><p>Ok. The vette has developed what would best be described as a “rattle”.</p><p></p><p>I seem to have narrowed it down to the rear of the block or the front of the transmission.</p><p></p><p>I gave it a quick cursory look, hoping it is was something simple like a loose heat shield. No luck, everything seems tight and solid.</p><p></p><p>I know the po had the transmission rebuilt at some time. Both from what the car lot guy told me and by the blue painted housing.</p><p></p><p>I’ve been meaning to have a closer look at the transmission, as the vette 700r4 is a little different (servo, sun shell, etc) than a “regular” 700r4.</p><p></p><p>But now I have another reason to look at it closer. When they rebuilt the transmission, it’s beginning to look like it’s possible they installed the old bolts or maybe didn’t torque them properly. </p><p></p><p>Personally, I always replace flywheel/flex plate bolts when I take the trans/engine apart. It’s just cheap insurance. But I know I’m an exception and most guys (shops included) simply re-use the orginals. Nothing really wrong with it if they are in good shape, but like I said: cheap insurance.</p><p></p><p>So today, I’ll get the vette up on jack stands, slide under it, remove the inspection cover and have a good look/torque check on the convertor bolts. I’ll have a look at the starter nose while I’m in there too. If not shimmed properly, the flex plate can “tick” the starter nose.</p><p></p><p>Unfortunately, the rattle really sounds like loose/missing convertor bolts. I’ve seen it before and the sound the vette is making is pretty damned close to that sound.</p><p></p><p>I also picked up a couple new orifice tubes and ordered a bottle of A/C mineral oil (car is still R12). Now I just have to wait for the seal kit to show up....</p></blockquote><p></p>
[QUOTE="Tourmax, post: 174270, member: 5304"] Ok. The vette has developed what would best be described as a “rattle”. I seem to have narrowed it down to the rear of the block or the front of the transmission. I gave it a quick cursory look, hoping it is was something simple like a loose heat shield. No luck, everything seems tight and solid. I know the po had the transmission rebuilt at some time. Both from what the car lot guy told me and by the blue painted housing. I’ve been meaning to have a closer look at the transmission, as the vette 700r4 is a little different (servo, sun shell, etc) than a “regular” 700r4. But now I have another reason to look at it closer. When they rebuilt the transmission, it’s beginning to look like it’s possible they installed the old bolts or maybe didn’t torque them properly. Personally, I always replace flywheel/flex plate bolts when I take the trans/engine apart. It’s just cheap insurance. But I know I’m an exception and most guys (shops included) simply re-use the orginals. Nothing really wrong with it if they are in good shape, but like I said: cheap insurance. So today, I’ll get the vette up on jack stands, slide under it, remove the inspection cover and have a good look/torque check on the convertor bolts. I’ll have a look at the starter nose while I’m in there too. If not shimmed properly, the flex plate can “tick” the starter nose. Unfortunately, the rattle really sounds like loose/missing convertor bolts. I’ve seen it before and the sound the vette is making is pretty damned close to that sound. I also picked up a couple new orifice tubes and ordered a bottle of A/C mineral oil (car is still R12). Now I just have to wait for the seal kit to show up.... [/QUOTE]
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Corvette
C4 Forum
1988 Convertible for sunny day drives
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