Contact between crank bolts and torque converter

[ZR1160]

I pulledl my trans out today to fix a leakin input seal on the trans and the front of the converter has some marking on the face of the torque converter from the crank bolts....The converter is a Suncoast 1057......any ideas? Thoughts or whatnot?

 

[Mike L.]

Which flex plate do you run?

 

[ZR1160]

Stock(and original), should I go billet, it still out so now's the time to do it.....

 

[Mike L.]

You should not have these marks with a stock flex plate. I have seen the same marks with ATS billet flywheels but never with stock. If you have proper clearance between converter and flex plate ( .125 maximum with converter pushed back into trans ) I don't think it will hurt you.
I think SOCAL Diesel will have a billet flywheel shortly. Check with Guy.

 

[Bluemax]

I have the same thing with mine and the 1057. It has been in the truck some time in early 06 I think. When I pulled the engine to put in a new crank I just assumed that the crank had hit it when it broke and put it back together. I've had the engine out of the truck 2 or 3 times since then and you can see where it's rubbed every time. I've never put a new flex plate or converter in it and I've never had any leaks from the tranny or anything so I don't think it's causing any major problems. I've just been sitting back waiting on one of Guys flex plates to see if that solves the problem.

 

[ZR1160]

Well for now its going back together as is, I will be going with a billet flexplate in the next round of upgrades!

 

[SIKDMAX]

Good to hear that Guy will have one out soon!

 

[Turbotug]

My guess.

It's from the flex plate flexing under TC clutch apply.

 

[JMK777]

what about grinding or turning the bolt heads down a tad

 

[Mike L.]

My guess.

It's from the flex plate flexing under TC clutch apply.

Nope. This be a converter machining error.

 

[Mike L.]

what about grinding or turning the bolt heads down a tad

We need as much depth in the allen head bolts as we can get because of the wicked tq procedure.

 

[last_one]

My 1058 is this way also

 

[Turbotug]

Nope. This be a converter machining error.

So, the recess for the bolts needs to be deeper?

Just to satisfy my own curiosity..if you have the trans on a bench, TC installed, you used and outside source to supply main pressure, and applied the TC clutch what would happen? TC pop out?

 

[duratothemax]

My guess.

It's from the flex plate flexing under TC clutch apply.

ok can someone explain to me HOW this is even possible??

look at the picture and tell me how this this action/reaction is going to make the box move forward in ANY way.

picture the little guys pushing on the (brown) tc clutch discs...thats the apply pressure. They are "theoretically" pushing against the inside wall of the converter, not against the bellhousing of the trans, no? So in essence, I dont know why everyone thinks the whole converter moves/pushes forward (as shown by the yellow arrow)

if you were standing inside a solid metal box and you pushed on the wall, would the entire box move forward in the direction you are pushing on the wall?

Or maybe im the idiot? I have no idea....but the whole "converter pushes against the flexplate when it applies" thing doesnt make sense to me.

ben

 

[WolfLMM]

Because nothing but the flex plate is holding the converter in.

 

[duratothemax]

if you have the trans on a bench, TC installed, you used and outside source to supply main pressure, and applied the TC clutch what would happen? TC pop out?

that is the question I was referring to in my post.

 

[SIKDMAX]

I just want to say props to you on that drawing Ben :thumb::spit:

 

[JMK777]

Maybe the converter expands with heat and pressure?

 

[Mike L.]

Maybe the converter expands with heat and pressure?

Not likely.

 

[SSchmi5519]

ok can someone explain to me HOW this is even possible??

look at the picture and tell me how this this action/reaction is going to make the box move forward in ANY way.

picture the little guys pushing on the (brown) tc clutch discs...thats the apply pressure. They are "theoretically" pushing against the inside wall of the converter, not against the bellhousing of the trans, no? So in essence, I dont know why everyone thinks the whole converter moves/pushes forward (as shown by the yellow arrow)

if you were standing inside a solid metal box and you pushed on the wall, would the entire box move forward in the direction you are pushing on the wall?

Or maybe im the idiot? I have no idea....but the whole "converter pushes against the flexplate when it applies" thing doesnt make sense to me.

ben

I was going to ask the same, but without the elaborate drawing. :rofl:

Not likely.

PS, Mike you have a PM!