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Dohc exhaust fitment

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mattwrx

Dohc exhaust fitment

I know there's other threads about this but it's driving me nuts. I had the half moon things facing the way in the picture but the exhaust manifold has some movement and leaks. If I flip them around the nuts won't even thread on the studs. Any suggestions?

mattwrx

Re: Dohc exhaust fitment

TOOLS1

Re: Dohc exhaust fitment

Administrator

In reply to this post by mattwrx

In the picture they are backwards. Maybe the wrap is not letting the collar slide over them correctly.
TOOLS

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1976 CB 750-A X 2
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shinyribs

Re: Dohc exhaust fitment

Administrator

^^^Exactly.

Also, do you have the copper crush washers in place?

mattwrx

Re: Dohc exhaust fitment

In reply to this post by TOOLS1

the flanges are completely seated against the inside of the collar and even when pushing against the flange and pipe the nuts wont start.

mattwrx

Re: Dohc exhaust fitment

In reply to this post by shinyribs

i do have the copper washers in they're just covered in carbon haha

mattwrx

Re: Dohc exhaust fitment

bump

mattwrx

Re: Dohc exhaust fitment

In reply to this post by mattwrx

can I just cut the flanges so they fit?

TOOLS1

Re: Dohc exhaust fitment

Administrator

NO! They worked before. There is something preventing them from going into the collars, and you need to find out why. Also did you remove the old copper crush washers?
TOOLS

mattwrx

Re: Dohc exhaust fitment

you saved my ass TOOLS. I checked and the old crush washers are still there. how the heck do i get them out? I tried picking at them with a pick and it just pulled the folded edge out.

mattwrx

Re: Dohc exhaust fitment

got one out with pb blaster and the pick. ill try and fit them again once i pull all the old ones out.

shinyribs

Re: Dohc exhaust fitment

Administrator

One extra crush washer left in the port won't cause it to sit that far out. Even if you removed those extra washers, looking at your pic, it'll probably only give you a couple threads to work with. I think you've got something else going on perhaps.

Rodgil

Re: Dohc exhaust fitment

In reply to this post by mattwrx

I found I had the rear of the exhaust fitted on the outside of the mounting arm, which stopped the flange from lining up exactly as yours is doing. It is easier to line up and bolt up, if the rear of the exhaust is free to move.

1982 CB750F
1978 Triumph Tiger 750
197? Yamaha DT175
197? Hodaka ACE 100