wcialrlter

I'll leave out the story just yet to avoid any bias but wanted to know what the accepted amount of alignment shaft and mounting surface runout might be on a 'performance' torque convertor.


All of the following measurements were checked and rechecked at different points in the lathe chuck to avoid any machine setup issues...they were all the exact same...it's a good lathe...

Here's what I have at the alignment shaft... 25-30...


And on the outside of the ring...25-30...



Here's the 'runout' on the flywheel mount tabs. All of the paint/powdercoat was removed with a wire wheel. The dial is on the machined surface...

#1


#2


#3



Opinions?

Jake's Performance

iTrader: (2)

Turn the converter around and check the runout of the drive hub.

Your mounting pads are fine and the outside ring runout isn't going to have a huge effect on anything but possibly balance.

We've seen and heard of issues with the converter drive hub runout on certain big name converters.

I8UR4RD

iTrader: (16)

uh oh! i wonder who! PM is in order!

wcialrlter

Clamp the pilot snout or the outside of the ring?

wcialrlter

Here's the outside of the ring chucked up.


Snout is out a good .025. You can see the wear pattern on the 'high' side of the snout as well. The bushing in the trans also confirms this...worn on one side...

wcialrlter

Trans bushing...

It's quite worn on one side. This wear is after one race...

Circle-D

iTrader: (21)

We typically check runout on our balancer, so you are sitting on the convert pads and centering on the pilot. Your method is a little different, but since you are repeating the results, then your numbers should be good. 20-25 is a little on the high side. I have seen some OE ones get that high, but to much in my opinion. We shoot for 8 or less, typically less than 5. I am sure the converter company you got it from can fix it, probably just slipped past them.

Chris