Date: Wed, 22 Mar 2006 03:18:10 +0000 (UTC) From: Craig's Saab C900 Site <c900nospam.apana.org.au> Subject: Re: Turbo/APC guage
"Al" <alistairdorenospamo.com> writes: >You probably just blew the line off the manifold, or as happens with many >older C900's the line is perished somewhere. Change all your vacuum lines >for silicone and you'll never have to change them again. I got really anal >and used blue for vacuum lines and red for the cruise control circuit. Another thing to look at as well as the hose itself is the fitting where it connects to the manifold. It's common for crankcase vent nipples to not make a good seal as the rubber grommets tend to harden and crack with continually heating and cooling of the engine. The vacuum nipple, while not subjected to quite the same level of heating/cooling as the engine block and cylinder head itself, certainly gets hot and over time the grommet will stop making a proper seal. They're cheap to replace for places like PFS, etc. of any of the other online Saab parts suppliers. There is probably a better way to do those vacuum connections, and it could well be possible to tap a thread in the grommet hole of the manifold and install some sort of a machined brass fitting onto which the vacuum lines to the brake booster, etc. can attach, but to date I haven't see it attempted. I don't know if the cast aluminium of the intake manifolds on the 8V or 16V engines has enough aluminium cast around the grommet hole to support something threaded into it, but if someone has done this, please let us know! As an aside I'm still trying to find brass or similar alloy replacements for the high-temp AC cutout swtich t-housing that mounts in the middle of the upper radiator hose in my 8V cars. Do the 16V engines utilise a similarly-mounted thermoswitch mounted in the top radiator hose? Craig. -- Craig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900nospam.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonautnospaml.com | Web-forums, galleries, library, links, etc.