Carrillo rod bolts size Norton 850

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Torontonian

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As supplied my new Norton 850 Carrillo rod bolts are pre-tightened up.
How to remove them , fit shells and tighten up again to the crank journals ? They are 12 point ( as I see ) but no one as far as I can research mentions the socket type/size I need to proceed.
 
Don't you have any 12 pt sockets or wrenches to see what fits? Or just take the rod to the HW store...
 
Assuming your rods are using the 5/16 unf bolts that Carrillo typically supplies with that size of rod then they will need a 3/8 12 point socket. In the US, I probably got mine from a A NAPA store. They should hopefullly be a fairly common item even in imperially challenged Canada.
 
Personally I’d never buy a single socket like this (only if it was something large and unique).

I‘d take it as an opportunity to buy a set of unified / AF 12 point sockets.

Once you have ‘em you’ll honestly wonder how you lived with a Norton without them!

Unless you’re a pro mechanic there’s no need for them to cost much either.
 
Fast Eddie said:
Personally I’d never buy a single socket like this (only if it was something large and unique).

I‘d take it as an opportunity to buy a set of unified / AF 12 point sockets.

Once you have ‘em you’ll honestly wonder how you lived with a Norton without them!

Unless you’re a pro mechanic there’s no need for them to cost much either.
Click to expand...
These are not standard 12 point but an inch variation of Torx, so no other use than the con rod bolts.
 
Interesting!

I certainly didn’t buy a special socket for mine, so a ‘standard’ 12 point socket of some kind must fit.

Hopefully Jim will chime in…
 
[QUOTE="Fast Eddie, post: 557216, member: 5411"
I certainly didn’t buy a special socket for mine, so a ‘standard’ 12 point socket of some kind must fit.
[/QUOTE]

I didn't have a problem either.
 
Fast Eddie said:
Personally I’d never buy a single socket like this (only if it was something large and unique).

I‘d take it as an opportunity to buy a set of unified / AF 12 point sockets.

Once you have ‘em you’ll honestly wonder how you lived with a Norton without them!

Unless you’re a pro mechanic there’s no need for them to cost much either.
Click to expand...
Opinions on 'much' may differ ;)

But my JSM rods are just done up to the stretch figure using a 12 point socket from my standard AF set!

I don't see a spanner size quoted, really I would have thought that is a 'special tool' was required they would be making a lot of noise about that! Or risk having a lot of unhappy customers!

Typically, I find 35 lb/ft and the stretch figure coincide!
 
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A common 3/8" 12 pt US socket works fine. Never tighten them beyond 35 ft lbs and they are good for life. Tighten them beyond 40 and they are ruined. They are very high quality and very expensive.
 
gortnipper said:
Ok, I just looked at the Carillo site, and yeah. Not 12 pt SAE.

@jseng1 would be able to tell you the right socket.
Click to expand...

Like Jim and SeelyWeslake said, the correct socket is a common (Imperial/SAE/MS/NAS/ASTM/...) 3/8" 12-point size, available everywhere in the US from hardware stores, auto supply stores, home supply stores, etc. The bolt heads are not some sort of inch Torx design or other special design, just normal 3/8" 12-point, also referred to as double-hexagon or external wrenching.

Ken
 
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For the obsessive among us, the SAE standard for the 12-point head is AS870, Wrenching Configuration, Bi-Hexagonal (12 Point) Drive, Design Standard For (STABILIZED Feb 2015).

Ken
 
A large magnifying glass shows S 5 . N . 0 3 0 on the rod bolt end .
J.S. has circled in marker for me Thread 5/16-24 , Type CARR , Head Marking S5 , Stretch Recommended English 0.0050 in to 0.0070 in
, Stretch recommended Metric 0.130 to 0.180 , Torque not to Exceed English 40 ft/lb , Torque not to exceed Metric 54 NM
They came assembled tight , not loose .
 
Thanks. Looks like I'm shopping for a socket set tomorrow .
3/8 drive AF 12 point set , including the 3/8 socket of discussion.
 
Just go to Home Depot and pick up a set of Crafsman, if they are still any good. I got mine from Sears 30 years ago and most of them still look pretty new despite loads of use.
 
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