Bob L.
Mar 17 2013, 02:03 PM
Hello,
I have been slowly making progress fitting the final vacuum hoses on the engine but none of the diagrams I find match completely.
I don't have the anti-flashback valve. Is that normal for a '76? Do I just ignore that circuit?
Also, how are the hoses connected for the charcoal canister filter? I know one goes to the air cleaner. I'm not sure where on the fan shroud the other one goes to. Are there fittings to make the connection or should the hose just fit snugly on the nipple? The hoses I have seem to fit loosely or not at all.
I would appreciate a few pics of the hose connections and the routing so I can match it up with what I am seeing.
BTW the EGR and air injection is gone so that may affect picture selection.
Thanks in advance
Bob.
TheCabinetmaker
Mar 17 2013, 03:21 PM
The 76's did not have vented heads, so no afb valve.
No hose clamps. Just friction fit. Replace the hoses and they will fit tight.
76-914
Mar 17 2013, 03:43 PM
the carcoal canister connects to the fan housing down low battery side. forget about the advance side of the dizzy if you have a 76 set up, just the retard side gets vac. were you referring to the Decel valve when you said anti flashback. If so, without one you'll get some very mild popping on deceleration when cold.
914Eric
Mar 17 2013, 03:58 PM
If I'm not mistaken, there is an entire section or thread in history/originality that has pictures of engines.
Bob L.
Mar 17 2013, 04:00 PM
76-914: The hoses are new so they must be the wrong ones. They came in a kit which doesn't seem completely correct.
The Cabinetmaker: I meant AFV. The decel valve is connected. I already have the vac advance to the dizzy hooked up. Should I remove and plug that one? Why?
Thank you for the help.
TheCabinetmaker
Mar 17 2013, 06:43 PM
76 posted about the decel valve, i posted about the hoses.
Where do you have the vacuum advance hooked to?
There is no connection for it on a late model throttle body.
The connection on the rear of the tb is for retard.
Mike Bellis
Mar 17 2013, 07:13 PM
Bob L.
Mar 17 2013, 07:41 PM
QUOTE(The Cabinetmaker @ Mar 17 2013, 07:43 PM)
Where do you have the vacuum advance hooked to?
There is no connection for it on a late model throttle body.
The connection on the rear of the tb is for retard.
It comes off the plenum as shown on Jeff Bowlsby's "late-1974 2.0 diagram Circled and arrowed in red. I have the retard hose connected as shown.
Click to view attachmentThis is the closest diagram to what I see on my engine.
914Eric: Oh, I have searched! Those and many other pics. I just cant find one or several combined that show what I need to see.
I have also never been able to find a pic of the oil tower I have with the adapter for the vacuum hose. Someone said they shoved the hose in the hole but that can't be correct. Here's mine, if anyone can show me what it should look like with the hose attached I would greatly appreciate it.
Click to view attachment
76-914
Mar 17 2013, 09:00 PM
send 'em back. my first set was incorrect and sent them back to AA for the correct kit. after a while you end up with your own supply house.
jcd914
Mar 17 2013, 10:23 PM
Jeff's diagram is not indicating the vacuum advance should be hook to the intake plenum but is indicating that the hose should be left disconnected but tucked under the plenum. The advance is not used on 75/76 but the advance canister needs to be open to the atmosphere and so a hose is added and tucked down under the intake. This keep moister out of the canister but allows the diaphragm to moved when the retard port get vacuum.
The large port on your oil filler should be connected to a port on the air filter housing the same size, should be on the driver side front corner area of the housing.
Without the vent ports on the heads you won't have an Anti Flashback Valve, just the 1 crankcase vent on the oil filler.
Jim
TheCabinetmaker
Mar 18 2013, 05:08 AM
Jim is correct about the advance hose . If it connects to the plenum, its under constant vacuum. He also echos what I said about the anti flashback valve.
JeffBowlsby
Mar 18 2013, 08:29 AM
I dont believe that is a 914 oil filler tower, which holds the PCV for the late 1.7L and all 2.0L. The 1.8L towers have a hose connection on the filler funnel itself. Maybe your tower is a transplant from a bus or VW T3 or? Someone more knowledgeable than me may recognize it.
76-914
Mar 18 2013, 08:37 AM
that is the correct tower. I gave up and ran a 7/8" or 3/4" (can't remember which) heater hose with a rubber step down reducer (aka disposal connector) to connect to the air box. That was 4 yr's ago and it's still working.
Bob L.
Mar 18 2013, 08:39 AM
QUOTE(Jeff Bowlsby @ Mar 18 2013, 09:29 AM)
I dont believe that is a 914 oil filler tower, which holds the PCV for the late 1.7L and all 2.0L. The 1.8L towers have a hose connection on the filler funnel itself. Maybe your tower is a transplant from a bus or VW T3 or? Someone more knowledgeable than me may recognize it.
That would explain a lot.
I have one from a 1.7 with the PCV/hose adapter in it. I'll use that.
Thanks.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please
click here.