Crankshaft bolt torque?

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friedman
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Crankshaft bolt torque?

Post by friedman » Sat Dec 08, 2018 11:16 am

Most spider pulley crankshaft nuts are torqued to 181 lb-ft (or as tight as our compressor driven guns can make them). Is this the same torque setting for the later crankshaft reverse thread bolts? My shop manual is silent on this.
Carl in Virginia
75 spider
86 Bertone
77 X1/9
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Re: Crankshaft bolt torque?

Post by fp55scca » Sat Dec 08, 2018 12:45 pm

--From GC Manual, 1st edition, p. 187:

All early crankshafts with nut "Fiat manual states 181 ft/lbs, but 120 is enough"

All late with reverse-thread bolt "141 ft/lbs but 120 is adequate"

--Just for info, I've used the 120 figure for years, including racing. I do use Loctite with all of them.
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 Fiat 124 Spider
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friedman
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Re: Crankshaft bolt torque?

Post by friedman » Sat Dec 08, 2018 1:36 pm

I checked and the gun got them to 140, no Loctite, so I guess I'm good. I have the GC manual and looked for that info but couldn't find it, what page was it on?
Carl in Virginia
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fp55scca
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Re: Crankshaft bolt torque?

Post by fp55scca » Sat Dec 08, 2018 3:33 pm

--GC Manual, 1st edition, p. 187....
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 Fiat 124 Spider
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friedman
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Re: Crankshaft bolt torque?

Post by friedman » Sun Dec 09, 2018 9:04 am

I found it, thanks.
Carl in Virginia
75 spider
86 Bertone
77 X1/9
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