Lancia Motor Club Forum Banner
24 October, 2020, 09:07:43 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail forum.admin@lanciamc.co.uk, for Database Administrator e-mail database.admin@lanciamc.co.uk      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail events@lanciamc.co.uk      -      To Join the club go to http://www.lanciamc.co.uk/join.htm
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Broken inner shafts  (Read 2258 times)
0 Members and 1 Guest are viewing this topic.
Jay
Megaposter
*
Posts: 279



« on: 08 November, 2014, 09:22:41 PM »

This took me by surprise, especially the thickness of the shaft, although it was a nice clean conical break.
Might post the whole transaxle refurb, itís been a hell of a journey. 


* broken.jpg (707.82 KB, 1665x1248 - viewed 228 times.)
Logged

Julian Wood, Kingston, London
chriswgawne
Permanent resident
**
Posts: 1641



« Reply #1 on: 09 November, 2014, 08:28:55 AM »

That's slightly surprising to see the output shaft broken. On an Aurelia they are smaller and can be a weak point although Flaminia shafts/bearings can be substituted in the existing Aurelia casing without mod'n.
Chris
Logged

Chris Gawne
Mobile: 07778 216552
dannels
Megaposter
*
Posts: 276



WWW
« Reply #2 on: 09 November, 2014, 12:26:14 PM »

Wow - that explains your issue!

Guess you will have to stop doing those burn outs Julian!!!
Logged

1961 Flaminia GT, 1966 Matra Djet V
neil-yaj396
Committee
Permanent resident
*****
Posts: 1040



« Reply #3 on: 09 November, 2014, 05:44:42 PM »

The same thing happened years ago on a half shaft on my Frogeye Sprite. An engineer friend of mine attributed it to what he called a 'milling scratch'. A tiny fault in the casting that is exacerbated by the machining and allows fatigue to build up over the years until the part fails I think?
Logged

1979 1300 Beta Coupe, 2014 Ypsilon 1.2 S Series Momo
Jay
Megaposter
*
Posts: 279



« Reply #4 on: 24 November, 2014, 02:20:42 PM »

Having spoken to a few people in the know, this seems to be quite a common problem, Jaan at Eddins Moto mentioned that he has replaced 4 of them in recent years.

Maybe all the years of motoring have started to take their toll, with this being a weak link in the design. Strange as they look quite beefy.   
Logged

Julian Wood, Kingston, London
Jay
Megaposter
*
Posts: 279



« Reply #5 on: 25 November, 2014, 04:23:59 PM »

I see Classic Lancia replacement shafts look stronger
http://www.classiclancia.com/car-parts/index.php?route=product/product&keyword=flaminia&category_id=0&description=on&product_id=61

Logged

Julian Wood, Kingston, London
chriswgawne
Permanent resident
**
Posts: 1641



« Reply #6 on: 25 November, 2014, 05:18:08 PM »

Not sure that they do look stronger. I don't like seeing 90 degree angles on highly stressed parts. I have had several Aurelia propshafts fail whilst racing....and always where there is a 90 degree step. Lancia engineering design was always pretty good IMHO.
Chris
Logged

Chris Gawne
Mobile: 07778 216552
Jay
Megaposter
*
Posts: 279



« Reply #7 on: 25 November, 2014, 05:30:00 PM »

My thoughts are that the Classicís shafts have a greater diameter as it is the same as the outer diameter of the inner spline. Whereas Lancia look like they are turned down narrower to the inner diameter, so overall diameter is less.

I guess this is also to do with ease of production with only straight turning, the stepped middle section is for the outer seal.
Logged

Julian Wood, Kingston, London
JohnMillham
Rebel Poster
*
Posts: 978



« Reply #8 on: 26 November, 2014, 07:22:19 PM »

Not sure that they do look stronger. I don't like seeing 90 degree angles on highly stressed parts. I have had several Aurelia propshafts fail whilst racing....and always where there is a 90 degree step. Lancia engineering design was always pretty good IMHO.
Chris
not unlike crankshafts, where Lancias always made them with a nice radius at the corners, but subsequent regrinds don't always!
Regards, John


* image.jpg (380.21 KB, 1752x1090 - viewed 224 times.)
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2018 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.043 seconds with 21 queries.