New 383 going in

[cullencombs]

I just finished up putting a new 383 in and had a strange noise coming from the flex plate or torque converter. It sounded like something hitting lightly under moderate acceleration. The flex plate does have some noticeable run-out. I'm gonna pull the transmission and change the flex plate. I hope that fixes it.

 

[maddog20_20]

Did you check your thrust bearing endplay when assembling - I had a friend that built a 383 with an eagle assembly and put the engine in and was having the same issues you are describing - he put a new flexplate on and back together and started it to only find the same issue -- pulled the engine and found the thrust bearing was toast. He took it back to the builder and they found there was something wrong with the way the crankshaft was ground.

 

[papabearxl]

Did you check your thrust bearing endplay when assembling - I had a friend that built a 383 with an eagle assembly and put the engine in and was having the same issues you are describing - he put a new flexplate on and back together and started it to only find the same issue -- pulled the engine and found the thrust bearing was toast. He took it back to the builder and they found there was something wrong with the way the crankshaft was ground.

Boy, that would suck!

 

[carpenter383]

Did you check your thrust bearing endplay when assembling - I had a friend that built a 383 with an eagle assembly and put the engine in and was having the same issues you are describing - he put a new flexplate on and back together and started it to only find the same issue -- pulled the engine and found the thrust bearing was toast. He took it back to the builder and they found there was something wrong with the way the crankshaft was ground.

Yep, the guy at my local machine shop told me eagle cranks are "hit and miss" he said they sometimes are out of spec and need turned when new!

 

[cullencombs]

Did you check your thrust bearing endplay when assembling - I had a friend that built a 383 with an eagle assembly and put the engine in and was having the same issues you are describing - he put a new flexplate on and back together and started it to only find the same issue -- pulled the engine and found the thrust bearing was toast. He took it back to the builder and they found there was something wrong with the way the crankshaft was ground.

I turned the motor over after I removed the torque convertor bolts and one pad on the flexplate was about .200 farther away from the torque converter than the rest. It is pretty easy to see the runout when the motor is idling. I hope i dont need to pull that engine.

 

[jrm81bu]

I turned the motor over after I removed the torque convertor bolts and one pad on the flexplate was about .200 farther away from the torque converter than the rest. It is pretty easy to see the runout when the motor is idling. I hope i dont need to pull that engine.

Sounds like the flexplate is bent or warped. You'll be pulling the motor or transmission, unless you can slide the transmission back far enough to remove the flexplate bolts. It could be worse, I pulled my engine and replaced a cracked flexplate with a spare I had and found out it was bent, had to pull it again after I bought a new one.

 

[cullencombs]

I turned the motor over after I removed the torque convertor bolts and one pad on the flexplate was about .200 farther away from the torque converter than the rest. It is pretty easy to see the runout when the motor is idling. I hope i dont need to pull that engine.

Sounds like the flexplate is bent or warped. You'll be pulling the motor or transmission, unless you can slide the transmission back far enough to remove the flexplate bolts. It could be worse, I pulled my engine and replaced a cracked flexplate with a spare I had and found out it was bent, had to pull it again after I bought a new one.

I pulled the transmission and installed a new flex plate and the noise is gone>

 

[matt79]

that was quick