rear axle valve???

tunepipe911 · 02-04-2005

hello to all opelers,

any idea what this little thing is?(see picture)
This little valve(??)was located at the top on the rear axle on the
passenger side,I supose it is to let a flow off air in or out??

just curious

opelspyder · 02-04-2005

It appears to be the air valve for the earlier Opel GT rear end-went on top of right side axle housing-might have been used with kadett/manta also. Took me a second-never pulled it all the way out to see other side
Keith

tunepipe911 · 02-04-2005

thanks for fast reply,is the valve to be used or not??

GTJIM · 02-04-2005

That valve vents the inside of the rear axle housing to atmosphere so that as the diff oil and more importantly the air inside the differential heats up on a trip - the air can escape without being pressurised. If it is not used then the presure build-up inside the differential will force the hot oil out through the seals in the wheel bearings and on to the rear brakes plus up the torque tube.

So I guess that using it and keeping it unblocked is quite important!

jeff denton · 02-04-2005

Yes. Making sure that vent is unplugged is a periodic maintenance must on any gearbox. We see them plugged on big trucks all the time, the first sign of blockage is oil running out of the input/output seals.

02-04-2005	#2 (permalink)
opelspyder Opel Key Master Join Date: Mar 2002 Location: Tennessee Posts: 1,301	Valve It appears to be the air valve for the earlier Opel GT rear end-went on top of right side axle housing-might have been used with kadett/manta also. Took me a second-never pulled it all the way out to see other side Keith

02-04-2005	#3 (permalink)
tunepipe911 Member Join Date: Nov 2002 Location: belgium Posts: 261	valve thanks for fast reply,is the valve to be used or not?? __________________ opel gt freak,what a car!!

02-04-2005	#4 (permalink)
GTJIM Old Opeler Join Date: Jun 2003 Location: New Zealand Posts: 5,686	Yes! That valve vents the inside of the rear axle housing to atmosphere so that as the diff oil and more importantly the air inside the differential heats up on a trip - the air can escape without being pressurised. If it is not used then the presure build-up inside the differential will force the hot oil out through the seals in the wheel bearings and on to the rear brakes plus up the torque tube. So I guess that using it and keeping it unblocked is quite important! __________________ GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved

02-04-2005	#5 (permalink)
jeff denton former opel racer Join Date: Nov 2002 Location: near some glaciers Posts: 2,863 Real Name: Jeff "Oh-Oh" Denton	Yes. Making sure that vent is unplugged is a periodic maintenance must on any gearbox. We see them plugged on big trucks all the time, the first sign of blockage is oil running out of the input/output seals. __________________ No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)