Crankshaft Part Numbers 124 Spider

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atruscott
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Re: Crankshaft Part Numbers 124 Spider

Post by atruscott » Thu Sep 19, 2019 9:37 am

My understanding (which might be wrong) is that the part number refers to the blanks, and then the grind was applied. So while, in general, there was a fair degree of alignment of specific blanks to a specific grind.... that wasn’t exclusively the case.
1960 Autobianchi Bianchina Transformabile
1970 238 Camper OHV
1974 124 Wagon TC
1974 124 Special TC
1975 124 Sport Coupe
1976 124 Sport Spider (The Racer)
1981 Spider 2000 (The Resurrected)
1985 Pininfarina Azzurra
2017 124 Spider Abarth Elaborazione
fp55scca
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Re: Crankshaft Part Numbers 124 Spider

Post by fp55scca » Thu Sep 19, 2019 10:13 am

vandor wrote:
Thu Sep 19, 2019 12:03 am
The division was not in 1974/75, but in the middle of the 1977 model year. That is when the nose of the crank, crank timing belt gear and crank pulley all changed.
--------------------------------------------
--Csaba, right you are...my mistake. But what about crankshaft flywheel bolts? Didn't Fiat go to the 12mm bolts in 1975? The '73 1592 and the '74 1756cc still used the 10mm flywheel bolts, but I thought this changed in '75?
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 CSA Abarth Replica
1981 Fiat Spider Ratrod
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davedecker4
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Re: Crankshaft Part Numbers 124 Spider

Post by davedecker4 » Thu Sep 19, 2019 11:46 pm

I thought differences between 74 and 75 where more cosmetic, like 74 being the last of the early style chrome bumpers and 75 having tube bumpers and various emissions bits, etc. but engine essentially same
Dave Decker
a 'couple' Fiats and Lancia's
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atruscott
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Re: Crankshaft Part Numbers 124 Spider

Post by atruscott » Sat Sep 21, 2019 6:38 am

I’ve just realized I had a brain-fart on this post.... I was referring to camshafts earlier, not crankshafts...... sorry
1960 Autobianchi Bianchina Transformabile
1970 238 Camper OHV
1974 124 Wagon TC
1974 124 Special TC
1975 124 Sport Coupe
1976 124 Sport Spider (The Racer)
1981 Spider 2000 (The Resurrected)
1985 Pininfarina Azzurra
2017 124 Spider Abarth Elaborazione
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atruscott
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Re: Crankshaft Part Numbers 124 Spider

Post by atruscott » Sat Sep 21, 2019 6:38 am

I’ve just realized I had a brain-fart on this post.... I was referring to camshafts earlier, not crankshafts...... sorry

Different crankshaft numbers I think refer to different suppliers...
1960 Autobianchi Bianchina Transformabile
1970 238 Camper OHV
1974 124 Wagon TC
1974 124 Special TC
1975 124 Sport Coupe
1976 124 Sport Spider (The Racer)
1981 Spider 2000 (The Resurrected)
1985 Pininfarina Azzurra
2017 124 Spider Abarth Elaborazione
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vandor
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Re: Crankshaft Part Numbers 124 Spider

Post by vandor » Wed Sep 25, 2019 1:24 am

fp55scca wrote:
Thu Sep 19, 2019 10:13 am
But what about crankshaft flywheel bolts? Didn't Fiat go to the 12mm bolts in 1975? The '73 1592 and the '74 1756cc still used the 10mm flywheel bolts, but I thought this changed in '75?
I think, but not sure, that the 12mm flywheel bolts came in late 1978 model year.
Csaba
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'71 124 Spider, much modified
'72 124 Coupe, new project, ex-Pete, ex-Eli, ex-Jack car (all Mira members)
'73 124 Wagon, no floors
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fiatfactory
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Re: Crankshaft Part Numbers 124 Spider

Post by fiatfactory » Sat Oct 12, 2019 10:57 am

The casting number on a part (specifically a part that has "other" parts attached or fitted to it) like in the case of a crankshaft (where it has the oil way plugs fitted) or a cylinder head (which has guides and valve seats fitted) won't correspond to the actual part number the crank or head is listed as in the Fiat microfiche / parts book... in most case (certainly with cylinder heads) a lot of the time the listed part number will be one digit otut from the casting number... just like this.
dohc 4325214b.jpg
dohc 4325214b.jpg (286.04 KiB) Viewed 485 times
dohc 4325214a.jpg
dohc 4325214a.jpg (143.66 KiB) Viewed 485 times

With camshafts it refers to the cast blank, and the cast in part number tells you zip / nada ... as the same casting can easily have several totally different grinds for lift / duration...

SteveC
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friedman
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Re: Crankshaft Part Numbers 124 Spider

Post by friedman » Sat Oct 12, 2019 1:56 pm

Kind of makes you wonder if any motors got the "wrong" part as it was assembled on a Friday afternoon after the workers went on strike in the morning because the weather was nice.
Carl in Virginia
75 spider
83 Bertone
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atruscott
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Re: Crankshaft Part Numbers 124 Spider

Post by atruscott » Sun Oct 13, 2019 3:40 pm

Carl - I maintain that the taller workers were able to pick up more parts at the same time from the bins at the edges of the assembly lines and bring them to their seat.... so their cars had more overlap than the smaller workers who picked up less parts at once....
1960 Autobianchi Bianchina Transformabile
1970 238 Camper OHV
1974 124 Wagon TC
1974 124 Special TC
1975 124 Sport Coupe
1976 124 Sport Spider (The Racer)
1981 Spider 2000 (The Resurrected)
1985 Pininfarina Azzurra
2017 124 Spider Abarth Elaborazione
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