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Clutch head size
#241326 Wed Sep 26 2007 07:13 PM
Joined: Jan 2007
Posts: 20
4
New Guy
I have a couple of parts doors that I need to disassemble that are out of a 41-46 Chev truck. The PO didn't know for sure which year, but the are definitely from a Chev of that era, since the passenger door has the key hole in the panel, instead of the handle. The interior panels are put on with clutch head screws. Anyone have any idea what size clutch head driver I will need to get the panels off? Do I just measure the "hole" across the wide portion, and that will tell me whether I need a 3/16 or a 5/32 (or other size) clutch head bit?


1940 Chev pickup

“Make the world a better place, save a rusty truck.”
Re: Clutch head size
#241327 Wed Sep 26 2007 09:28 PM
Joined: Sep 2006
Posts: 3,847
B
'Bolter
I would suggest buying the set of four from someone like classic parts-$18.00 I use mine everyday it seems. the four common sizes are 5/16", 1/4", 3/16", 5/32. The measurement is across the opening at the ends of the hourglass shape.

Re: Clutch head size
#241328 Wed Sep 26 2007 10:11 PM
Joined: Jan 2007
Posts: 20
4
New Guy
Thanks Brad. I was coming to the same conclusion about buying the four sizes. The 40 that I am restoring has mostly all slotted screws, not the clutch head, but there are a couple in different areas of the truck that have a couple clutch head. Just enough to stop the progress because I don't have the right tool when I need it. Isn't that always the way. For $18, I should get the set.


1940 Chev pickup

“Make the world a better place, save a rusty truck.”
Re: Clutch head size
#241329 Wed Sep 26 2007 11:08 PM
Joined: Mar 2000
Posts: 784
4
'Bolter
Just so you know if your door has the keyhole in the door it's from a 46. The 41s had the key in the handle.

Re: Clutch head size
#241330 Thu Sep 27 2007 04:07 PM
Joined: Jul 2005
Posts: 650
T
Shop Shark
I bought one of those vendor sets years ago, and they were crap. One snapped off, and the mid-sized on turns in the handle. i found that a larger sized Phillips screwdriver jammed into the head does the job. Of course, you won't be re-using those screws...

Re: Clutch head size
#241331 Thu Sep 27 2007 04:18 PM
Joined: Jun 2000
Posts: 457
J
Shop Shark
I found both the clutch head screwdrivers and clutch head bits (for nut drivers) at my local NAPA for less than the sets from the specialty vendors.


Jeff Nelson

"Beer is proof that God loves us and wants us to be happy." - Benjamin Franklin
"Always do right. This will gratify some people and astonish the rest." - Mark Twain
Re: Clutch head size
#241332 Fri Sep 28 2007 03:51 AM
Joined: Sep 2006
Posts: 42
O
Wrench Fetcher
The other option is to get the clutch tips for a magnetic screw driver. I got mine at Chevy of the forties in Vancouver WA. and they work great with a Snap-on handle.

Re: Clutch head size
#241333 Fri Sep 28 2007 04:00 AM
Joined: Jan 2007
Posts: 20
4
New Guy
Tried the local NAPA store today. I asked them if they carry any clutch head screwdrivers or bits and they got this funny look on their face. After I explained what they were, they got the catalog out and could not find any in it. Guess I will be looking at one of the online sources.


1940 Chev pickup

“Make the world a better place, save a rusty truck.”
Re: Clutch head size
#241334 Fri Sep 28 2007 04:01 AM
Joined: Sep 2003
Posts: 181
O
Wrench Fetcher
Will the clutch tips for a magnetic screw driver work with a 3/8" impact wrench or would that be too much punishment for them? I've got some that are REALLY tight.
David


The only thing more amazing than my ability to cram 60 minutes of work into a 9 hour day is my talent for making it look effortless!

My 1962 Chevy C-30
Re: Clutch head size
#241335 Fri Sep 28 2007 05:29 AM
Joined: May 2005
Posts: 9,175
G
.
You can buy just the inserts, you know with the 1/4" hex on one end and the clutch on the other.

I bought a few at the local hardware store.

you can also get the bits from McMaster Carr.
http://www.mcmaster.com/

page 2755 in the online catalog, all 5 sizes for less than $6 total.

part numbers for the short ones:
7188A31
7188A21
7188A23
7188A24
7188A32

longer ones available, look at the page mentioned above.

Should be fine in the impact, and if not then they were cheap...

Grigg


•1951 GMC 250 in the Project Journals [stovebolt.com]
•1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup [stovebolt.com]
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