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Fan blade bolts 1954 Chevrolet 3600 use lock washers?
#1412814 Sat Jun 05 2021 11:33 PM
Joined: Jul 2014
Posts: 698
D
Dusty53 Offline OP
'Bolter
When I removed the fan blade, it did not have lock washers or any washers for that matter on the 1/4 -20 bolts that fasten the fan blade to the water pump shaft/hub. What is the correct method? Standard Lock washers? External teeth lock washer?


Ronnie
1954 Chevy 3604 - A work in progress...

" You can't keep dancing with the Devil and wonder why you're still in hell"
Re: Fan blade bolts 1954 Chevrolet 3600 use lock washers?
Dusty53 #1412819 Sun Jun 06 2021 12:09 AM
Joined: Feb 2004
Posts: 22,578
H
'Bolter
Any locking device on a 1/4-20 bolt should work. A drop of blue Loctite would probably be my choice, either with a SAE flat washer, or none at all. Be sure to use at least a Grade 5 bolt- - - -the silver-colored Grade 2 bolts found in the usual hardware store bulk bins are soft as butter and won't take much torque. They're good for attaching sheet metal parts like oil pans and valve covers, but not where there will be some noticeable stress like holding the fan on.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fan blade bolts 1954 Chevrolet 3600 use lock washers?
Dusty53 #1412837 Sun Jun 06 2021 03:09 AM
Joined: Jul 2014
Posts: 698
D
Dusty53 Offline OP
'Bolter
Thanks Jerry! I had not considered the grade of bolt or the torque. I'll be sure to get the correct torque spec and get out the torque wrench. Somewhere within the last 67 years the fan blade got changed . Its a 4 blade, 18" but has a 1 -1/8 " pilot hole, not 1" to match the water pump shaft. I'll be replacing it with the correct one. Thanks again for the help.


Ronnie
1954 Chevy 3604 - A work in progress...

" You can't keep dancing with the Devil and wonder why you're still in hell"
Re: Fan blade bolts 1954 Chevrolet 3600 use lock washers?
Dusty53 #1412840 Sun Jun 06 2021 04:02 AM
Joined: Feb 2004
Posts: 22,578
H
'Bolter
That constant pull of the fan against the bolts, and any misalignment of the fan to the hub caused by the oversized hole in the fan could set up just enough of a vibration to stretch or loosen an incorrect bolt. Getting a fan blade into a radiator is annoying- - - -losing a single blade due to stress cracks caused by vibration can be downright deadly! I've seen a few destroyed fan shrouds, and at least one perforated hood caused by a fan blade coming adrift!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fan blade bolts 1954 Chevrolet 3600 use lock washers?
Dusty53 #1412990 Mon Jun 07 2021 05:10 PM
Joined: Sep 2011
Posts: 912
B
'Bolter
If got a small mark on the frame from loosing a blade in the late '70s, lucky it went down & not up! Shut it down quick, vibrated like crazy.


BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting

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