After Market Manifolds

[Drholliday]

Just wanted to give the guys running after market manifolds a heads up to check the manifold to head bolts. Over the course of putting mine on at 80k miles and 131k I lost 2 bolts and blew the gasket. Of course it all came to happen at the NHRDA race last weekend, lol.

Just wanted to let the guys know to check them before they have to replace a gasket. Easier to check then remove all of them.

 

[ChevyDieselLLY]

That's crazy. They didn't break off did they?

 

[Drholliday]

That's crazy. They didn't break off did they?

Nope, both bolts on the #8 exhaust port where gone. Fixed it this week and its good as new.

 

[emiller3]

Just installed a set and will check them after running for a bit. Thanks for the info.

 

[Noreaster]

Ill check tomorrow thanks

 

[02bigstrokin]

i lost one out of my bd manifold also

 

[paint94979]

i lost one out of my bd manifold also

It must have been installer error :joker:

 

[Fingers]

I have found they can loosen up after several big heat cycles. Same for the flange bolts.

 

[jdlover1]

Mine loosen up a few times on the passenger side last year. I thought it was just me having this happen to.

 

[x MadMAX DIESEL]

why not just thread lock them

 

[LBZrcks]

Mine loosen up a few times on the passenger side last year. I thought it was just me having this happen to.

Guess i wasn't the only one either. I noticed 2 of mine had started to back out by #7.

 

[CurtisEmery]

Thread locker tends to loose its hold at higher temps. I may be wrong but there may be some high temperature grades availible. I don't use it personally. They are hard enough to break loose with anti sieze let alone a thread locker imo..

 

[Drholliday]

I have found they can loosen up after several big heat cycles. Same for the flange bolts.

This did come after my cross country trip towing a trailer.... Endless hours of 1k-1.3k egt's.

 

[BlkMax]

I was just thinking about letting the bolts heat cycle a few times, re-torquing, then safety wire. That may be a solution, but you would need cross drilled bolt heads.

 

[Fingers]

I don't think they are coming loose from spinning out, per se. I think the gaskets and manifold seat which reduces the effective torque on the bolt. So lock wirering them might keep them from spinning out, but they will still be loose.

I personally recommend torquing them to spec, go get them real hot once, and retorque.

 

[TrentNell]

I can get locking hardware but it isn't the cheapest stuff , real nice though and guaranteed to work .

 

[Jetty LBZ]

are those called locking keys or something like that? iv seen them use those on horsepower or some tv show be4

 

[Utahski]

I can get locking hardware but it isn't the cheapest stuff , real nice though and guaranteed to work .

Nice green. Is that engine from a tractor?