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ram300

Posted 2017-09-05 9:36 PM (#547811)
Subject: Exhaust manifold bolts coming loose

Extreme Veteran

Posts: 363
100

I have a friend who is having problems with exhaust manifolds bolts coming loose and blowing out gaskets after 100 miles or less ! He is using bolts that are about 1 1/4 inch long with no spring/lock washer just a factory type HD flat washer. He was also advised to only torque to 20ftlb by gasket manufacturer.

I've suggested a longer bolt, a spring/lock washer and torque to 30-35ftlb. Don't really want to go down the loctite route. will spring washers lose their tension? Did all early cars run spring washers on exhaust from factory?

Any tips advice to get these gaskets to stay in place, being a 426 in a tight engine compartment it is a real bear to change them out.......

Thanks
Owen

Powerflite

Posted 2017-09-05 10:25 PM (#547813 - in reply to #547811)
Subject: Re: Exhaust manifold bolts coming loose

Expert 5K+

Posts: 9654
5000

Location: So. Cal

The factory generally used studs. Studs don't loosen up as easily, but I generally do use lock washers with them. They will lose their spring after a while, but they will still be effective once they are rusted on there.

60 dart

Posted 2017-09-05 11:35 PM (#547816 - in reply to #547811)
Subject: Re: Exhaust manifold bolts coming loose

Expert 5K+

Posts: 8947
5000

Location: WHEELING,WV.>>>HOME OF WWVA

go to epay and look up the "lock nuts" of the correct size --------------------------------------------------later

57plybel

Posted 2017-09-06 4:39 AM (#547821 - in reply to #547811)
Subject: RE: Exhaust manifold bolts coming loose

Extreme Veteran

Posts: 594
500

Location: Melbourne, Australia

Ive forgotton the exact terminology but remember them resembling a castle/ castellated nut (finer slots) .... front of it pinched maybe and held tight by slight interference.... pretty much single use items.

Colin

finsruskw

Posted 2017-09-06 9:22 AM (#547828 - in reply to #547821)
Subject: RE: Exhaust manifold bolts coming loose

Expert

Posts: 2289
2000

Location: Eastern Iowa

They are often referred to as 'stover nuts'
Fastenall calls them 'top loc' nuts.

rebel

Posted 2017-09-09 7:03 PM (#548064 - in reply to #547828)
Subject: RE: Exhaust manifold bolts coming loose

Extreme Veteran

Posts: 309
100

Location: Western Colorado

If you can go with studs, use a little longer stud and double nut them. Won't ever come loose.
Bob

mstrug

Posted 2017-09-09 10:04 PM (#548074 - in reply to #547811)
Subject: Re: Exhaust manifold bolts coming loose

Expert 5K+

Posts: 6498
5000

Location: Newark, Texas (Fort Worth)

Stage 8 sells kits:

http://www.ebay.com/itm/like/391512235821?chn=ps&dispItem=1

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