muffler exhaust manifold bolts

jim_uny · Jan 29, 2016

seems like i always break off manifold, exhaust manifold & flange bolts. then i have to center drill and left handed drill out remainder. is there a hi temp grease or anything else to keep bolt lubricated ? is it wise to replace with grade 8 ?

flembo · Jan 29, 2016

Loctite C5A copper based anti seize is good for 1800 deg. I have never used it on manifold bolts but I don't know why it wouldn't work. Someone else may come on with more experience then me.

MSS3020 · Jan 29, 2016

yep been there did that... I haven't had to try again yet but back then the advise I got was remove em when the engine is hot helps..Kinda thought to myself that that seems logical cause I have used torch to heat up bolts and they come loose but didnt care to work on a hot engine...

Mike M · Jan 29, 2016

Apply never seize helps a lot. Or put in studs and use brass nuts. That works good too.

Married2Allis · Jan 29, 2016

Anti seize and stainless steel bolts/nuts.

Mike(NEOhio) · Jan 29, 2016

Use a copper-based anti-seize. For me it's like Frank's Hot Sauce. "I put that s**t on everything". Don't bother with the aluminum-based type. Most studs are already Gr 8.

caterpillar guy · Jan 29, 2016

After you get them out drill them so you can put a nut on the opposite end. Then if they twist off just replace the bolt. Did that 30 years ago on the old Chrysler's we drove.

markct · Jan 29, 2016

Brass or stainless nuts help, grade 8 won't take the heat on applications like turbos often, grade 5 holds up better generally, this is of course if the oem special turbo bolts are unavailable

Ranchingelec · Jan 29, 2016

I have had very good luck with ceramic based anti-seize. When the bolts are removed there is a white powder left over that helps the bolts ease out.. Walter product called "rock and roll"

Bob · Jan 29, 2016

"grade 8 won't take the heat on applications like turbos"

HUH???? Don't tell DEERE and Cummins!

"Brass or stainless nuts help"

Stainless fasteners (while they sound like a good deal) often GALL and seize on exhaust applications.

Dean · Jan 29, 2016

Brass nuts and/or high temperature anti seize.

Dean

dieseldaawg · Jan 29, 2016

If you have the room, I've had good luck using a air hammer with a shake-n-break adapter. Pull trigger on air hammer while turning long 3/4" wrench back and forth.
Shake N Break Tool Link

4play · Jan 29, 2016

Nickle based anti seize is what I use, better than copper for temp resistance (2400-2600*f) but both would be sufficient here, nickle is better to use when mating different metals together, and better resistance to corrosive materials like acids or other chemicals.

John Deere D · Jan 30, 2016

Used NICKEL ANTI-SEIZE on all Exhaust Cap Screws (Exhaust manifold to Head) of the 4000 HP NORDBERG V-16's.
Used NICKEL ANTI-SEIZE on all CASE SPLIT LINE BOLTS of the WESTINGHOUSE STEAM TURBINES.
Bob...

markct · Jan 30, 2016

Speaking from my experience and the wisdom passed down to me by a 40year experienced heavy equipment mechanic. I didn't fully believe it till our allis Chalmers loader broke 3 of the turbo bolts I had put in, replaced with grade 5 and been fine. Maybe something to do with the Lawson bolts composition, I dunno. And yes I know Deere uses 8 for manifold bolts etc

JOHN908 · Jan 31, 2016

I watched a mechanic heat the manifolf intill it glowed red,used a extension,socket and air gun.The studs came right out,then he installed new studs.

muffler exhaust manifold bolts

jim_uny

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flembo

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MSS3020

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Mike M

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Married2Allis

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Mike(NEOhio)

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caterpillar guy

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markct

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Ranchingelec

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Bob

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Dean

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dieseldaawg

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