Vacuum line identification

kenny999 · Jul 3rd, 2009, 14:35

Hi, I mentioned this in my previous thread - but now now have some (admittedly poor) photos

This is a 740 that I'm tring to fix for an elderly neighbour (new water pump needed)

As an aside I found an open to the atmosphere port on the inlet manifold that was sucking air. Blocking it imporoved the running - so I've temporarily occluded it.

I expected to find a small bore vacuum line (ignition advance or similar) flapping around in the engine bay - but cant seen to find what was meant to be connected to the manifold.

I guess it could be meant to be just blocked off - but any comments welcome;

Again, sorry for the poor pics, and just to clarify, it is just a small bore push-fit vacuum port (looks funny in pic, because I've used the finger of a rubber glove, and a cable tie to occlude it for now)

BlueBrickSte · Jul 3rd, 2009, 21:53

The only thing that I've been able to find is a vague picture in a 340 Haynes manual. Same ish B2xx with a carb and "idle air bypass" in the carb base area. Have you had the air ducting off yet? If it is this then by the looks of it the stub will be covered in cack n a little bit harder to find. Sorry I couldn't be of more help but one reply is better than none for a newbie.

kenny999 · Jul 6th, 2009, 13:23

Cheers for the reply. Looks like the answer was right in front of me all along (it's in the pics I posted)

I was looking for a single free end.

The item circled in the copy of the pic (below) is a T shaped connector, and it looks like it is this that should connect to the port.

Still puzzled as to what it does, however, one end heads up through the bulkhead (behind the speedo cluster) other end I've not followed yet.

BlueBrickSte · Jul 6th, 2009, 14:46

Not that I know owt about them but is it possible you have an econometer. A vacuum gauge with iirc yellow green n red segments on.

nickm · Jul 6th, 2009, 15:40

That looks like a climate control/AC vacuum line.
On mine it goes to the heater valve, and vacuum for the climate control. A vacuum pump is is connected to assist under boost. Maybe the pump has been removed?

Jul 3rd, 2009, 14:35	#1
kenny999 New Member Last Online: Jul 6th, 2009 13:23 Join Date: Jul 2009 Location: exeter	Vacuum line identification Hi, I mentioned this in my previous thread - but now now have some (admittedly poor) photos This is a 740 that I'm tring to fix for an elderly neighbour (new water pump needed) As an aside I found an open to the atmosphere port on the inlet manifold that was sucking air. Blocking it imporoved the running - so I've temporarily occluded it. I expected to find a small bore vacuum line (ignition advance or similar) flapping around in the engine bay - but cant seen to find what was meant to be connected to the manifold. I guess it could be meant to be just blocked off - but any comments welcome; Again, sorry for the poor pics, and just to clarify, it is just a small bore push-fit vacuum port (looks funny in pic, because I've used the finger of a rubber glove, and a cable tie to occlude it for now)

Jul 6th, 2009, 13:23	#3
kenny999 New Member Last Online: Jul 6th, 2009 13:23 Join Date: Jul 2009 Location: exeter	Think I've got it! Cheers for the reply. Looks like the answer was right in front of me all along (it's in the pics I posted) I was looking for a single free end. The item circled in the copy of the pic (below) is a T shaped connector, and it looks like it is this that should connect to the port. Still puzzled as to what it does, however, one end heads up through the bulkhead (behind the speedo cluster) other end I've not followed yet.

Jul 3rd, 2009, 21:53	#2
BlueBrickSte Premier Member Last Online: May 8th, 2016 20:48 Join Date: Mar 2009 Location: near Wigan View Photos By: BlueBrickSte	The only thing that I've been able to find is a vague picture in a 340 Haynes manual. Same ish B2xx with a carb and "idle air bypass" in the carb base area. Have you had the air ducting off yet? If it is this then by the looks of it the stub will be covered in cack n a little bit harder to find. Sorry I couldn't be of more help but one reply is better than none for a newbie.

Jul 6th, 2009, 14:46	#4
BlueBrickSte Premier Member Last Online: May 8th, 2016 20:48 Join Date: Mar 2009 Location: near Wigan View Photos By: BlueBrickSte	Not that I know owt about them but is it possible you have an econometer. A vacuum gauge with iirc yellow green n red segments on.

Jul 6th, 2009, 15:40	#5
nickm Member Last Online: May 14th, 2024 14:48 Join Date: Oct 2008 Location: Sydney Australia	That looks like a climate control/AC vacuum line. On mine it goes to the heater valve, and vacuum for the climate control. A vacuum pump is is connected to assist under boost. Maybe the pump has been removed?

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