Really depends if that one clamp over the tank is still in place. There were two different diameter pipe set ups used. If going the new pipe route go for the 86 and later set up. You may have to open  the holes over the tank to make some more room. This gets you onto the later hoses front-rear also. For folks keeping the water boxer in the85 and earlier vans I try hard to push for the change to later cooling system and exhaust. If you're doing the work and spending money anyway try to get the most benefit. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Stuart MacMillan
Sent: Saturday, May 13, 2017 8:49 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Steel coolant pipe removal?

Can these pipes be removed without dropping the gas tank? And can the SS pipes be installed as well that way? Engine and tranny are out, and I'm prepping for the conversion.

 

The pipes in my '85 are not rusty, but one of them is flattened for about 4"
to an oval that's �" by 2", rather than the 1 �" original diameter. One surprise after another with these old vans.  A quick calculation says that's about a 0.8 sq. in. area for coolant flow vs. the round 2.4 sq. in. area.
Yikes. Never had an overheating issue, but with my Subaru conversion investment I'm going to junk these pipes.

 

What's easiest to install, the two piece or full length pipes? I'm thinking the full length pipes are better without the extra hose connection, but I really don't want to drop that tank (again). 

 

Thanks!

 

Stuart