Originally Posted by Lepke
Available at TAD:
When you reinstall the gasket
between the flange and the manifold, do NOT slather anything on the side facing the manifold. Indeed, you MUST clean the manifold side thoroughly
, or else you WILL get a leak. Clean, clean, clean, flat, flat, flat. The reason to do so, beyond the potential leak, is to avoid having to clean it next time!
You should find a way to remove some of the coolant
before you disconnect the manifold/flange, perhaps at the coolant pump
, unless you want to replace all of the coolant, not a bad idea on a new to you engine anyway.
I recommend buying
at least two gaskets. Why? The gasket material around the holes for the bolts/screws/studs is very, very slim. If/when they get wet they could/might disintegrate. Not good, but having another one right there will save you lotsa grief. BTDT.
Put just a tad of gasket sealer on the face of the gasket facing the flange
, pat the gasket onto the flange, then slide onto the studs. Easier to do that way and keeps the manifold side completely clean. Do NOT put any sealant
on the manifold side.
Originally Posted by DougR
THIs all happened to me about 22 or 23 years ago, but for sure the flange and street elbow were definitely reusable. However they were so corroded together that I couldnít separate them even having the street elbow red hot with an acetylene torch.
If your parts are shot, order the new flange/ pipe stub from TAD as Lepke shows in his post. Pretty sure you will need the flange/pipe as shown on the upper line in his post.....the part with the five holes in the flange.
As you probably know the exhaust manifold (painted blue) is cast aluminum
and is cooled with freshwater (Antifreeze) so when you remove the exhaust flange you will get some antifreeze
running out the aft end of the manifold. While you have the flange off, check the threads in the flange mounting holes in the manifold. Over the years I had to helicoil one or two of them, and if yours are marginal you might as well do it now.
Some high temperature pipe thread sealant
You also have, somewhere, the place to introduce the raw water
from the HX into the exhaust gas before the muffler
. Is that part still usable? Lepke's source might have that, too. Sometimes called a nipple, with a 5/8" or so pipe from the HX for that hose leading into the 1 5/8" to 2" metal riser. Some have used a pipe T instead of a welded nipple.
Between the end of the metal riser and the inlet port of the muffler
is a good place to use "hump hose" a blue soft(er) hose to minimize vibration from the pipe to the muffler port. Catalina
Direct sells it. Since I have a Catalina
, that's where I got mine. Don't know who else has it but someone will.
I've replaced mine 3 times in 25 years, so I've had some 'speriences...
Good luck, all the best,