Lancia Motor Club Forum Banner
10 December, 2019, 08:39:12 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Starter ring gear  (Read 690 times)
0 Members and 1 Guest are viewing this topic.
davidwheeler
Permanent resident
**
Offline Offline

Posts: 1084



« on: 30 April, 2019, 08:48:14 AM »

To save me taking off the flywheel, can anyone please tell me the outer diameter of the starter ring gear?   I am told that the teeth are not suitable for building up by welding so I am wanting to see if I can find a gear on line or, failing that, going to my local Church clock repair shop to see if they can make one (or several).
Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Dikappa
Megaposter
*
Offline Offline

Posts: 267


« Reply #1 on: 30 April, 2019, 06:28:37 PM »

I went to measure mine, it measures 396mm and seems to be in pretty healthy condition.


* P1090817.JPG (201.99 KB, 1440x1080 - viewed 68 times.)

* P1090818.JPG (175.17 KB, 1440x1080 - viewed 58 times.)

* P1090819.JPG (187.39 KB, 1440x1080 - viewed 59 times.)
Logged
davidwheeler
Permanent resident
**
Offline Offline

Posts: 1084



« Reply #2 on: 01 May, 2019, 09:34:13 AM »

Aren't you lucky!  Thank you.   I make it 136 teeth.
But that is my replacement gear - the original is 130.
« Last Edit: 31 October, 2019, 02:18:48 PM by davidwheeler » Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Dikappa
Megaposter
*
Offline Offline

Posts: 267


« Reply #3 on: 01 May, 2019, 06:28:03 PM »

You want a tooth count David?

Logged
davidwheeler
Permanent resident
**
Offline Offline

Posts: 1084



« Reply #4 on: 02 May, 2019, 04:44:54 PM »

32!   I can count them myself thanks and I did once but have forgotten.   The pitch and depth are more important and I have measured those as 9mm pitch, 7mm depth and 19mm length.  Anyway, I make it 130.
« Last Edit: 02 May, 2019, 05:05:04 PM by davidwheeler » Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Mikenoangelo
Member
****
Offline Offline

Posts: 86


« Reply #5 on: 02 May, 2019, 08:07:23 PM »

Careful - metric gears are identified as "Module" not pitch. You'll need to Google a bit to understand (excuse me if you already do!) but I suspect what you have is a gear of Module 3 which would give 130 teeth on a pitch circle diameter of 390mm (overall diameter 397 less 2 times 1/2 the tooth height = pitch circle diameter). If you work out the tooth "pitch" on the PCD that would agree with your 9mm. A replacement gear would most likely be listed as Module 3 x 130 teeth. Obviously check before you buy!

Mike
« Last Edit: 02 May, 2019, 08:17:24 PM by Mikenoangelo » Logged
Dikappa
Megaposter
*
Offline Offline

Posts: 267


« Reply #6 on: 03 May, 2019, 05:08:59 AM »

Would it not be more cost effective to make the drawing and have a ring water jetted?  Off course there would be some grinding to to....
Logged
Mikenoangelo
Member
****
Offline Offline

Posts: 86


« Reply #7 on: 03 May, 2019, 03:36:04 PM »

Be aware if you do commission a new ring gear that there is more than one tooth profile on these. I had a ring gear made by Freedom Engineering near Hull and they found that the original teeth were what they described as "stub profile". Best if you do get one made, to borrow an original flywheel to show to the machinists. It might also  be a good idea to have it induction hardened.

Mike
Logged
davidwheeler
Permanent resident
**
Offline Offline

Posts: 1084



« Reply #8 on: 04 May, 2019, 08:30:12 AM »

I have just enquired of a firm in New Zealand who have gears of 393mmOD but you may be right, it could be better to get one made.    I have a friend who works in a shop that rebuilds church clocks and may well have machines big enoug.  Would anybody else be interested?
Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Dikappa
Megaposter
*
Offline Offline

Posts: 267


« Reply #9 on: 12 May, 2019, 02:17:00 PM »

Preparing some bits for the engine I just put the two flywheels I have here next to each other, and: surprise surprise they are VERY different!

The reddish painted one carries the number 1326 so I suppose it's a rather early one.
The black (read dirty) one has number 6792 stamped into it, which would make it a 7th series flywheel.  It seems to have a shrinked on gear ring, as opposed to the red one.
It is also a few mm smaller in diameter.

Reading in Bill Jamiesons Lambda Bible reveals however only the sixt series cars fitted with Magneti Marelli starter had a detachable starter gear ring.

Any comments to the puzzle most welcome.

@David: is your car a late series car, as then a starter gear ring would be nice, seen the black one has some wear...so please keep me posted of the progress...





* P1090821.JPG (170.83 KB, 1440x1080 - viewed 80 times.)

* P1090822.JPG (183.17 KB, 1440x1080 - viewed 74 times.)

* P1090826.JPG (171.52 KB, 1440x1080 - viewed 45 times.)

* P1090820.JPG (238.01 KB, 1440x1080 - viewed 72 times.)
Logged
Dikappa
Megaposter
*
Offline Offline

Posts: 267


« Reply #10 on: 13 May, 2019, 05:32:10 AM »

@ David: re-reading your comments I reckon the 393 mm ring from New Zealand might be right...
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