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Flexplate bolts broke from torque conv while driving!

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7.9K views 5 replies 5 participants last post by  Rip VW  
#1 ·
A year ago I had my 364 Nailhead rebuilt and hired a garage to install it back in my 58 Buick which has a Dynaflow transmission.

Saturday, on my way to a show, i heard a loud knocking noise under the car and pulled over. I turned the car off. When I went to start the car again I didn't get so much as a sound from the starter. I had power but nothing was moving. It took me jumping the starter relay (not the solenoid) from the positive battery cable to get it to engage again and finally start. This noise was intermittent ever since, but I also noticed a metallic grinding sound (like a circular saw) when i hit about 30mph. When I release from the gas and re-engage it would go away. I thought the starter was engaging while the engine was running.

I brought my Buick to the shop today to see what was making all the noise . They pulled the flexplate cover and discovered that one of the bolts that holds the flexplate to the torque converter had snapped in half and the remaining two bolts were loose. Right now they are trying to get part of the broken one out of the threads. Can someone please help me understand how this could happen so it never happens again.

Could this problem have caused the starter to temporarily fail? I can't wrap my head around how this could happen considering it was re-attached to the tranny a year ago and driven a dozen times since. I could understand if it had been on the car for years and the bolts wore out, but not a fresh install. Very frustrating.
 
#2 ·
First off, sorry for your trans issue. It's never fun to break down on the way to a show.
Who ever installed the trans didn't get the bolts tight enough, i.e., torqued to the correct torque value. Plain and simple unfortunately for you. The starter didn't have anything to do with it.

Keith
 
#3 ·
Really? Because the same shop is doing the repair and acting like I'm bothering them. They're gonna charge me for the repair. They asked me for the torque ratio. They also said they will be using Grade 8 bolts this time. Wondering what they originally used. I had given them the service manual during install of the engine to tranny when they first did it. I won't get out of paying again because they say my car is not something they work on every day so they can't guarantee anything. But does it make sense that the car starting issue may have been related?

Not only that, but the rear seal kit I gave them to install is leaking worse than before and they told me to take it to a tranny shop, when I thought any garage should be able to do that.
 
#5 ·
I'd guess their statement about using grade 8 bolts this time tells much of the story. Besides not using the proper bolts the first time, they should not be trusted to fix it right this time. I'd get it out of there, and take it somewhere that isn't incompetent, and knows more about cars in general. They shouldn't have taken the job the first time if they can't guarantee what they do.
 
#6 ·
The shop that botched the installation, should be ultimately liable in my book. They either used the wrong bolts or never tightened them in the first place. You are the victim here. I get so P.O ed at shops that do work like this. If you are in business you damn well should stand behind everything you do. If one of your employees screws up you eat the cost you don't charge the customer a second time.

I think that shop owes you. They should have seen what happened and immediately fixed the problem NO COST. I am with everyone else that says "Get your car away from them immediately" this shop does not deserve to be in business. Take it to someone whom stands 100% behind their work!