Date: Sun, 5 Feb 2012 10:02:22 -0500
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: exhaust studs/bolts
In-Reply-To: <E96305A0-EAF3-46EC-B38F-CF7CAB9C38B0@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
From the factory cylinders 1 and 4 used the studs and 2,3 used bolts. Why!
Maybe for access to get wrenches in place or to hold one side in place while
the bolts get started on the other. For ease of installing the pipes all
studs makes thing easy while under the van. Also when it comes time for
removal it is always easier to remove a nut from a stud even when heat is
needed as the nut will expand and loosen real fast once the torch is there.
The advantage of all bolts is that now you can remove a head without
dropping the exhaust. Pick your poison. If using stainless consider using
A4(316). Some of the A2(18-8) has tensile strength as low as 70,000 psi and
in my experience can be more likely to gall. Always use a nickel based
anti-seize or Loctite especially on stainless to stainless (nut and bolt)
connections.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jarrett Anthony Kupcinski
Sent: Saturday, February 04, 2012 2:49 PM
To: vanagon@GERRY.VANAGON.COM
Subject: exhaust studs/bolts
I've got a bit of confusion about the exhaust studs.
I'm replacing the exhaust pipes on my '89 2.1L Westy, and have removed the
entire exhaust system. The pipes were attached to the exhaust ports via 2
studs at each port. I removed all 8 studs, to find they were a bit
mismatched: 2 x 40mm, 1 x 38mm, 1 x 36mm, 4 x 31mm.
I purchased a "hardware kit" which includes 4 x 30mm bolts and 4 x 38mm
studs, and I guess it makes sense to use the bolts to replace the upper
studs at each port and the new studs to replace the old lower studs. Fine.
I double check Bentley. At 15.17 only studs are shown on the for both the
upper and lower connections at the exhaust ports. At 26.9, it shows bolts
and studs being used to connect the exhaust, but only on the upper
connections of the front right and rear left exhaust ports. On the front
left and rear right exhaust ports the diagram seems to indicate that studs
should be used.
Hm. I check the list archives and it seems people have used all bolts, all
studs, and combinations to no reported ill effect.
I am assuming that it doesn't matter what I use where. Am I wrong in this
assumption, or has anyone discovered any "best practices" for exhaust pipe
connections? Any advice is appreciated. Thanks.
Jarrett Kupcinski
Oly, '89 Westy
