Exhaust manifold/elbow gasket question

seef158
Aluminum Star
Posts: 115
Joined: Sat Dec 20, 2014 3:49 pm

Exhaust manifold/elbow gasket question

Postby seef158 » Thu May 23, 2019 7:29 pm

'72 318, with the dual pocket water pump. Should the gaskets between the manifold and the elbow at the rear have the water passages opened up or closed???? If I understand the system correctly I would think the gastket should stop flow from the manifold to the elbow so that the two are isolated from each other. There are ports in the manifold and the elbow but I would think they should be closed up. Anyone know for sure? Thx.
1972 28' express single 318, working on getting the bugs worked out.
forest lake, mn
Duluth, mn
Washburn, wi

Fastjeff
Site Admin
Posts: 1173
Joined: Sat Jul 12, 2014 5:06 am
Location: Rock Halll, MD
Contact:

Re: Exhaust manifold/elbow gasket question

Postby Fastjeff » Sat May 25, 2019 5:55 am

If I read you right, closed for fresh water cooling; open for raw water.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

seef158
Aluminum Star
Posts: 115
Joined: Sat Dec 20, 2014 3:49 pm

Re: Exhaust manifold/elbow gasket question

Postby seef158 » Tue May 28, 2019 8:38 am

The fresh/raw water cooling terminology always trips me up, I have no antifreeze or hear exchanger, every thing is cooled by river water.....thanks for the reply.
1972 28' express single 318, working on getting the bugs worked out.
forest lake, mn
Duluth, mn
Washburn, wi

Fastjeff
Site Admin
Posts: 1173
Joined: Sat Jul 12, 2014 5:06 am
Location: Rock Halll, MD
Contact:

Re: Exhaust manifold/elbow gasket question

Postby Fastjeff » Wed May 29, 2019 5:46 am

That's raw water cooled. The PO of mine removed the FWC system and I ran RWC for the decade I owned it. Much simpler IF you're not in salt water.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington