Typ188 lsd woes

[tzei]

So ppl like mysteries right?  Or it is no mystery at all? It's 1st for me anyways...

 

Last track outing (q) lap times were in a ballpark. Came to pits and when i (later us) tried to push it under pit tent it didn't want to go backwards. Not even a little. Somthing was jamming big time. Removed rh h/shaft - no go. Off came lh h/shaft and now it rolls backwards. What is broken?

 

Opening soon...

[Tommy]

What's for prize? My vote for pinion bearing.

[kbmb02]

Guess (I loathe guessing, but this is for fun): Broken tooth on the ring gear, lying at the bottom of the housing.

Edited October 30, 2023 by kbmb02

[Son of Marty]

My guess is whatever's broken is hiding behind the rear cover.

[tzei]

Indeed 😁

[tzei]

On 10/29/2023 at 6:14 PM, Tommy said:

pinion bearing

Nope. All bearings are going to go thou. There was good teespoonful of metal on speed sensor magnet...

[tzei]

On 10/29/2023 at 8:06 PM, kbmb02 said:

Broken tooth on the ring gear, lying at the bottom of the housing.

Close

[AceAndrew]

34 minutes ago, tzei said:

Close

 

Internal pumpkin teeth/tooth broken?

[tzei]

5 minutes ago, AceAndrew said:

Internal pumpkin teeth/tooth broken?

No. One friction plate had none left but this didn't jam it.

[kbmb02]

1 hour ago, tzei said:

Close

Ring gear bolt?

 

 

[tzei]

Two were completely off, rest loose.

[Tommy]

So it's time for full rebuild. But the expensive LSD parts are good to go?

Did you have motorsport final drive or one of the std ratios?

[tzei]

Pressure plate took some hit unfortunarely. I think it’s cuz friction plate lost teeth. G/r is oe 4.1.

[kbmb02]

20 hours ago, tzei said:

Two were completely off, rest loose.

 

On one our high-speed circuits, I felt a clunk (T8 at Willow, for those who know) - I checked gauges, shrugged, finished the race. Once parked in the paddock, I saw diff oil on the ground and on back of the car. Upon inspection, it became obvious a ring gear bolt had come loose, whipped up by the gear and then smacked a hole through the top of the differential housing. Somewhere I have a photo of the bolt peeking through the new hole in the housing.

[tzei]

So does anyone know how deep oe hardening go? I know that Drexler pressure plates have some meat to work with but how about ZF? Here is my p/plate that kissed heavily w/ friction plate.