2 hole exhaust flange set up help (1 Viewer)

[kcisland]

Fellow Mudders,

Can someone show me a close up picture of their exhaust flange? The exhaust when I bought my 1970 40 was fubar and I didn't take good enough pictures so I don't know how it goes back together.

Here it was originally with broken ears on the manifold and a chain holding it together!

So I picked up a new one from Mark at Mark’s Offroad

I know I still need to pick up a gasket/donut between the two, but doing a rough dry fit the down pipe flange doesn't line up.

The middle of the flange hits the manifold before I can get the nut started on the bolt. Is it the wrong flange? I found a picture on another thread that shows the entire flange over the manifold lip so is there a wider flange? This flange is the same size as the manifold.

 

[Mark Jennings]

Wrong exhaust pipe. Needs to slide up into exhaust manifold and flange is supposed to be flat.

 

[73FJ40]

@kcisland
Mark Jennings is correct. Your exhaust pipe is wrong. The correct pipe isn't flared, like yours, but has a flat flange on which the gasket (shown below) sits.

 

[kcisland]

@kcisland
Mark Jennings is correct. Your exhaust pipe is wrong. The correct pipe isn't flared, like yours, but has a flat flange on which the gasket (shown below) sits.

Thanks! Understood, makes sense, the PO just rigged it before. Your picture is old and the flange and pipe is NLA I assume.

 

[73FJ40]

Correct, both the flange and exhaust pipe are NLA.

 

[kcisland]

Correct, both the flange and exhaust pipe are NLA.

Thanks for the help! I will improvise from here. Just wanted to get things in order before having a muffler shop bend the pipes.

 

[kcisland]

If anyone has a nice close up picture of one that would be awesome. I can fab my own that way. Otherwise I will just trace the bottom of the manifold and CNC one out of 3/8" steel.

 

[Mark Jennings]

SRO on line catalog kind of shows it. If you use a muffler shop, get it bent so it goes above the skid plate. That’s how the early models were routed.

 

[Mark Jennings]

DD2A1460-5C27-42EF-9CA6-EE407BEBA5C1.jpeg

• Mark Jennings
• Jan 26, 2020

Exhaust pipe

 

[Tysano]

SRO on line catalog kind of shows it. If you use a muffler shop, get it bent so it goes above the skid plate. That’s how the early models were routed.

I believe Mark meant S.O.R.Spector off road catalog

 

[Terry Lindsey]

Just an idea that worked for me...since the 76 flange is NLA, I attached a 78 exhaust flange to the 2 hole manifold with the Stock O ring. Then I fabricated a 2 pipe flat flange and attached it to that exhaust flange using the 78 2 hole 3 bolt gasket. Next, the two down pipes were joined into a 2 into 1 y pipe and attached to the single exhaust pipe. I know this sounds confusing but it was really easy. Please excuse the welding in the pics. I’m just finishing up rebuilding the motor so that’s why it’s disassembled but I’ve been running this for the past year with no leaks.

 

[kcisland]

Just an idea that worked for me...since the 76 flange is NLA, I attached a 78 exhaust flange to the 2 hole manifold with the Stock O ring. Then I fabricated a 2 pipe flat flange and attached it to that exhaust flange using the 78 2 hole 3 bolt gasket. Next, the two down pipes were joined into a 2 into 1 y pipe and attached to the single exhaust pipe. I know this sounds confusing but it was really easy. Please excuse the welding in the pics. I’m just finishing up rebuilding the motor so that’s why it’s disassembled but I’ve been running this for the past year with no leaks.

Thanks Terry,

Just a little misunderstanding due to my incorrect terminology. It is a 2 bolt flange with a single down pipe, not 2 hole down pipe.

I will fabricate a flange needed to attach to my manifold. Thanks guys!

 

[73FJ40]

@kcisland

Here are two pictures that should help you out.

The sketch is a little light (only had a red pen ) but note the 2 1/8" at top is O.D., as well as 2 5/8" to the outside of the flange.

It looks to me like a 2 inch pipe was expanded to 2 1/8" at the inlet end illustrated below.

The flange was slipped on and seal welded to the pipe.

 

[ToyotaMatt]

these are SOR 2 bolt flanges , 3/8" thick

if any one need one shoot me a PM

they DO work well on the black OEM pope above


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[kcisland]

these are SOR 2 bolt flanges , 3/8" thick

if any one need one shoot me a PM

they DO work well on the black OEM pope above


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View attachment 2194589

Thanks Matt! I have a full fabrication shop but may grab one from you to save time. Will PM you...

 

[ToyotaMatt]

yes ,

they are a huge step saver