Clone header bolts

hookm · 01-28-2012, 05:04 PM

The header bolts have come lose twice on my 420 clone,I've torqued them as much as I dare,if they come lose again should I use Loctite,they're Allen heads.thanks ,hookm

Flintrock · 01-28-2012, 11:56 PM

Hookem, that sounds a little strange, although allen head bolts don't give you the same surface contact/ surface tension a regular bolt would. Are you using a washer and lock washer?

racin161 · 01-29-2012, 02:59 AM

Hookm you might want to try this. First in clean the bolt holes with carb spray and install STUDS in the bolt holes with a bit of blue loctite then use your flat washer and steel self locking nut not nylon as the heat will melt it. If the bolts continue to loosen in your block your going to strip the threads and the studs will allow more clamping force.

Just a thought.

LOU

hookm · 01-29-2012, 09:34 AM

I didn't even think about lock washers,

hookm

sho305 · 01-31-2012, 01:23 PM

Lock washers, or you can also drill the heads and wire them. With regular bolts you could make a tabbed washer to lock them like an outboard prop nut is. Make sure you don't have some undue force or movement of the exhaust doing it, as it can break the exhaust over time anyway.

AirJunky · 01-31-2012, 01:59 PM

Lock washers for sure.

Then I'd try studs, lock washers & double nuts. They won't be comin loose again.

hookm · 01-31-2012, 03:55 PM

I think I have it,I used lock washers & a dab of blue locktite.I don't have room for studs.It is weird because it's a new head.I ran it a couple of hours yesterday & an hour today,so far so good.
Thanks for the help.hookm

Flintrock · 01-31-2012, 04:06 PM

Hookm, check to make sure the rest of your exhaust is secure, i.e. no play when moving that could stress the header.

hookm · 01-31-2012, 04:18 PM

I found a lose support yesterday & fixed it.hookm

01-28-2012, 05:04 PM	#1
hookm Younger Than Dirt Join Date: Aug 2007 Location: North Myrtle Beach SC Posts: 2,047	Clone header bolts The header bolts have come lose twice on my 420 clone,I've torqued them as much as I dare,if they come lose again should I use Loctite,they're Allen heads.thanks ,hookm

01-28-2012, 11:56 PM	#2
Flintrock Raised by coyotes Join Date: Nov 2008 Location: Central Texas Posts: 5,658	Re: Clone header bolts Hookem, that sounds a little strange, although allen head bolts don't give you the same surface contact/ surface tension a regular bolt would. Are you using a washer and lock washer?

01-29-2012, 02:59 AM	#3
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515	Re: Clone header bolts Hookm you might want to try this. First in clean the bolt holes with carb spray and install STUDS in the bolt holes with a bit of blue loctite then use your flat washer and steel self locking nut not nylon as the heat will melt it. If the bolts continue to loosen in your block your going to strip the threads and the studs will allow more clamping force. Just a thought. LOU
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515

01-29-2012, 09:34 AM	#4
hookm Younger Than Dirt Join Date: Aug 2007 Location: North Myrtle Beach SC Posts: 2,047	Re: Clone header bolts I didn't even think about lock washers,hookm

01-31-2012, 01:23 PM	#5
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,445	Re: Clone header bolts Lock washers, or you can also drill the heads and wire them. With regular bolts you could make a tabbed washer to lock them like an outboard prop nut is. Make sure you don't have some undue force or movement of the exhaust doing it, as it can break the exhaust over time anyway.

Today
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01-31-2012, 01:59 PM	#6
AirJunky Gone Wild Join Date: Jul 2009 Location: Liberty Lake, WA. Posts: 1,762	Re: Clone header bolts Lock washers for sure. Then I'd try studs, lock washers & double nuts. They won't be comin loose again.

01-31-2012, 03:55 PM	#7
hookm Younger Than Dirt Join Date: Aug 2007 Location: North Myrtle Beach SC Posts: 2,047	Re: Clone header bolts I think I have it,I used lock washers & a dab of blue locktite.I don't have room for studs.It is weird because it's a new head.I ran it a couple of hours yesterday & an hour today,so far so good. Thanks for the help.hookm

01-31-2012, 04:06 PM	#8
Flintrock Raised by coyotes Join Date: Nov 2008 Location: Central Texas Posts: 5,658	Re: Clone header bolts Hookm, check to make sure the rest of your exhaust is secure, i.e. no play when moving that could stress the header.

01-31-2012, 04:18 PM	#9
hookm Younger Than Dirt Join Date: Aug 2007 Location: North Myrtle Beach SC Posts: 2,047	Re: Clone header bolts I found a lose support yesterday & fixed it.hookm

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