Ever since I've owned my 63 Hawk, the rear most exhaust manifold bolt on the passenger side will gradually loosen itself and fall out. This has happened at least a half dozen times in all these years. Has anyone else had this problem, and how do you fix it?
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http://www.musclecarsandclassics.ca/...teel-1965-1967. Or, a french lock can be adapted.Bez Auto Alchemy
573-318-8948
http://bezautoalchemy.com
"Don't believe every internet quote" Abe Lincoln
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How about a little blue Loctite and a jam nut? All threaded fasteners are self-loosening under vibration - they NEVER tighten themselves.Gary Ash
Dartmouth, Mass.
'32 Indy car replica (in progress)
’41 Commander Land Cruiser
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.com
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I have a spare engine with a cracked head at that exhaust port. The small crack runs through the threads of the hole. Unless the manifold is removed, the crack is not visible. Someone told me that it's not uncommon. I hope this is not your problem. But it could explain why the bolt keeps coming loose. Even a small crack could decrease "thread contact " and ability to hold torque.John Clary
Greer, SC
SDC member since 1975
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Originally posted by bezhawk View Posthttp://www.musclecarsandclassics.ca/...teel-1965-1967. Or, a french lock can be adapted.Ron Dame
'63 Champ
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Originally posted by ColoradoHawk View PostEver since I've owned my 63 Hawk, the rear most exhaust manifold bolt on the passenger side will gradually loosen itself and fall out. This has happened at least a half dozen times in all these years. Has anyone else had this problem, and how do you fix it?
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A "French lock" is a metal tab on a washer that can be bent over the bolt head preventing it from turning. Studebaker used them on every engine I can think of. Think of the large crankshaft center bolt. That is a "French Lock"
Many manufacturers used them. The link (hopefully) shows a linked french lock that is used on Chevrolet.
On .....OH MY...... an EXHAUST MANIFOLD BOLT!!!
Here is another link, where it is called exactly that.
Last edited by bezhawk; 04-09-2017, 03:31 PM.Bez Auto Alchemy
573-318-8948
http://bezautoalchemy.com
"Don't believe every internet quote" Abe Lincoln
Comment
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Originally posted by bezhawk View PostA "French lock" is a metal tab on a washer that can be bent over the bolt head preventing it from turning. Studebaker used them on every engine I can think of. Think of the large crankshaft center bolt. That is a "French Lock"
Many manufacturers used them. The link (hopefully) shows a linked french lock that is used on Chevrolet.
On .....OH MY...... an EXHAUST MANIFOLD BOLT!!!
Here is another link, where it is called exactly that.
http://licorvette.com/french_locks_Corvette.htm
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If that Bolt is stretched, a fresh Grade 8 Bolt will fix it, but use the thick cast Iron Flat washer and outside Star Lock Washer that the Factory used, S.I. may have a barrel full.StudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967
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Thanks. I never heard the term, I just called them locking tabs.
Originally posted by bezhawk View PostA "French lock" is a metal tab on a washer that can be bent over the bolt head preventing it from turning. Studebaker used them on every engine I can think of. Think of the large crankshaft center bolt. That is a "French Lock"
Many manufacturers used them. The link (hopefully) shows a linked french lock that is used on Chevrolet.
On .....OH MY...... an EXHAUST MANIFOLD BOLT!!!
Here is another link, where it is called exactly that.
http://licorvette.com/french_locks_Corvette.htmRon Dame
'63 Champ
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