Hi All, I've just put in a replacement engine after a bit of a break between taking the old engine out and can't figure out all the Vacuum connections on the underside of the Inlet Manifold.

I'd appreciate if someone could help me out. It's a RHD car if that makes any difference?

 

Mine is parked on the street tonight, but I can have a good look tomorrow morning if that is any help.

 

That would be fantastic. Thank you.

 

At the front underside of the intake manifold just behind the thermostat housing is a hose(about 1/2") that goes to the brake booster.



On the underside of the manifold between the two carby's is another hose the same size, it goes around behind the engine to the upper left of the firewall to a check valve the continues from there to the vacuum tank tucked in behind the brake booster.



At the rear underside of the manifold there is a small metal 90 degree pipe pointing to the rear with a hose to the transmission vacuum modulator.



Another larger one connecting both carby's



A small hose off the rear carby goes to the distributor.



Both carby's connect to a pipe that is on top of the manifold and goes to the engine oil breather.





Hope this helps

 

Clarkey, your are a legend! Many thanks Sir.

I'm actually fitting an S3 Engine and BW66 Auto Trans. I've just retro fitted the Carbs and Manifold. The obvious difference is between the Auto Trans and the method of Kick Down/Down Shift. The S1 uses the vacuum you speak of above (and the one that had me scratching my head) and a micro switch on the throttle linkage, where as the S3 uses a cable operated system.

I think I should be able to work some kind of bracket and have the correct range of travel.

I'll let you know how I get on.

 

Ok, I've blanked off the rear most underside vacuum connection and have the started now. There is another vacuum pipe (well, I think it's vacuum) that needs connecting. Its the on the valve (some kind of diaphragm valve) that's connected to the coolant pipe coming of the back of the manifold. It has a smaller vacuum size take off?

Edit: Just had a quick look in my Haynes Manual and found out that the new vacuum pipe issue is for the Heater Water Valve Servo Unit. I'll check it out tomorrow.

 

That is the heater tap to let hot coolant into the heater core/matrix. Yours may look different to mine as one or both of us may an after market item fitted.



EDIT, I see your edit now. You found it While I was getting pics.

 

Mines the same as item 5 in the second picture.

 

All 4 of my service manuals and my original dealer parts book show the same as you have, mine looks like one from HQ-HX Holden.

The pic is from the parts book. It was NOS I found in a second hand bookshop still in plastic with 1973 publishing date inside.

If you are chasing original parts numbers for anything send me a PM and I will look them up.

 

Thanks Clark, very kind of you to offer.

 

Hello,..someone have the vacuum diagram ??

 

Have you installed the S3 engine yet? When I did the same thing; S3 into S1, I found the back of the head at the cams was no longer drilled and tapped. So, there's nothing to mount the throttle cable mechanism to, as the S1 has. I was forced to fab something ugly off a head stud. If you have not installed the engine yet, there's time to drill and tap the RH side. Once the engine's installed, there's no room to do this. Good luck, Rob