1996 850 non-turbo flame trap: small hose nipple at manifold?

[Andy]

Hi everybody. I am doing some maintenance, including flame trap
replacement on my 96 volvo 850 (non-turbo). I got the flame trap off
and discovered that the small hose was not attached to the manifold. I
had a mechanic replace my vacuum hoses around a year ago, and it seems
that he just spoofed me by dead-ending a short piece of new hose at the
flame trap nipple.

I have read about a small brass nipple on the intake manifold that this
hose goes to, but can not find any detail on where it is. I can't seem
to find it on my car. Can anybody lead me in the right direction?
Thanks, and Happy 4'th.

Andy

 

[Baz]

Hi everybody. I am doing some maintenance, including flame trap
replacement on my 96 volvo 850 (non-turbo). I got the flame trap off
and discovered that the small hose was not attached to the manifold. I
had a mechanic replace my vacuum hoses around a year ago, and it seems
that he just spoofed me by dead-ending a short piece of new hose at the
flame trap nipple.

I have read about a small brass nipple on the intake manifold that this
hose goes to, but can not find any detail on where it is. I can't seem
to find it on my car. Can anybody lead me in the right direction?
Thanks, and Happy 4'th.

Andy

The small brass nipple is on the right hand side of the inlet manifold
(alternator end) and is almost impossible to see, touch, reach and anything
else.

There is a moulded piece of rubber in the shape of a U-turn which fits to
the manifold and the other end to a piece of hard black plastic tubing
(nylon?). This runs under the manifold to the flame trap, where another
piece of rubber connects it to the part you know about.

Having said that I have fitted a new hose to mine twice without removing any
parts in the vicinity. It's not easy but just take your time. I actually
used a piece of ordinary rubber hose and made a big loop, rather than get
the custom made part.

I often wonder just what the arrangement achieves, but I put it back the way
Volvo made it anyway.

Regards
Barry

 

[Andy]

Thanks, Barry. I'll start looking. I do wonder also how this system
is working...the small hose draws a vacuum at the flame trap, and the
oil vapors travel up the large hose? It seems like a poorly designed
system.

Andy