1438 cam gear bolt torque specs

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70spider
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Your car is a: 1970 Fiat spider
Location: N.E. New Mexico

1438 cam gear bolt torque specs

Postby 70spider » Thu Oct 12, 2017 7:59 pm

Hello, I am getting near the end of my rebuild but came across a bit on a conundrum. The torque specs I have found online for the cam gear bolts were 87 ft.lbs. for the 1608 and 35 ft.lbs. for the 1438. is this correct? I have a 1608 head with 1438 cam towers, any help would be appreciated.
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i

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hayesbd
Posts: 171
Joined: Fri Mar 01, 2013 10:20 pm
Your car is a: 1973 Spider
Location: Newark, Ohio, USA

Re: 1438 cam gear bolt torque specs

Postby hayesbd » Fri Oct 13, 2017 1:05 pm

My official Fiat shop manual shows the 1438 in a lot of detail in the Appendix regarding the 124 Special T model. It very explicitly shows the tightening spec to be 87 ft-lbs. I have seen discussion about versions having polymer sprockets, and maybe they have lower torque specs, but I have found no reference to that in the official manual that covers all U.S.A. spec 124 cars from 1970 to 1974. You may want to double check the thread size - the manual shows that torque spec goes with an M10 X 1.25 thread.

I also looked through Brad Artigue's book and found no mention of anything special about the 1438 cams.

Hope this helps.
Brian
Current: 1973 124 Spider
Previous: 1961 600D, 1970 850 Racer, 1973 124 Special, 1974 124 Special TC

JohnMc
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Your car is a: 1970 Fiat 124

Re: 1438 cam gear bolt torque specs

Postby JohnMc » Fri Oct 13, 2017 1:37 pm

My 1970 Official Fiat 124 Sport book covering the Spider for the 1438 shows cam gear screws M 10 x 1.25 tightening torque of 35.4 ft lbs. Perhaps the 1608 uses larger bolts - do not know.
Again do not know what to do with mixing of parts.


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