davidwheeler
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« on: 30 April, 2019, 08:48:14 AM » |
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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).
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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Dikappa
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« Reply #1 on: 30 April, 2019, 06:28:37 PM » |
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I went to measure mine, it measures 396mm and seems to be in pretty healthy condition.
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davidwheeler
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« Reply #2 on: 01 May, 2019, 09:34:13 AM » |
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Aren't you lucky! Thank you. I make it 136 teeth.
But that is my replacement gear - the original is 130.
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« Last Edit: 31 October, 2019, 02:18:48 PM by davidwheeler »
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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Dikappa
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« Reply #3 on: 01 May, 2019, 06:28:03 PM » |
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You want a tooth count David?
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davidwheeler
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« Reply #4 on: 02 May, 2019, 04:44:54 PM » |
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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.
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« Last Edit: 02 May, 2019, 05:05:04 PM by davidwheeler »
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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Mikenoangelo
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« Reply #5 on: 02 May, 2019, 08:07:23 PM » |
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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
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« Last Edit: 02 May, 2019, 08:17:24 PM by Mikenoangelo »
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Dikappa
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« Reply #6 on: 03 May, 2019, 05:08:59 AM » |
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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....
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Mikenoangelo
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« Reply #7 on: 03 May, 2019, 03:36:04 PM » |
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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
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davidwheeler
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« Reply #8 on: 04 May, 2019, 08:30:12 AM » |
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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?
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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Dikappa
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« Reply #9 on: 12 May, 2019, 02:17:00 PM » |
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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...
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Dikappa
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« Reply #10 on: 13 May, 2019, 05:32:10 AM » |
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@ David: re-reading your comments I reckon the 393 mm ring from New Zealand might be right...
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davidwheeler
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Posts: 1487
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« Reply #11 on: 05 September, 2020, 11:39:03 AM » |
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I have been hors de combat for a while but, having recovered somewhat, I was thinking of getting a starter ring made. Browsing in my spares I came across a square flat package which turned out to contain - a starter ring! I had completely forgotten about it. Last week I took off the flywheel and found the ring to be the right size so I took it to my local engineering shop. The inner diameter of the ring is 3mm less than the one I fitted years ago, necessitating sacrifice of the lip on the flywheel but, fortunately, this brings the ring into exactly the right place for the modern starter.
The ring came from Koen. He is now engaged in trying to remember from where he got it!
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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Dikappa
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Posts: 559
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« Reply #12 on: 05 September, 2020, 03:56:03 PM » |
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lancialulu
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« Reply #13 on: 05 September, 2020, 08:00:30 PM » |
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21. 12v
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Dikappa
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Posts: 559
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« Reply #14 on: 06 September, 2020, 10:23:26 AM » |
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it was also out of stock when I ordered, but I send 'm a mail and it was no problem. Here's another one: https://www.koopvanderwalparts.com/ring-gear-170792.htmlI don't remember which one I send to David, but they are very very simular. |
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« Last Edit: 06 September, 2020, 11:05:59 AM by Dikappa »
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