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Brake servo

I'm planning to upgrade my SIII 109 2.25 petrol with a brake servo, I've obtained the servo, master cylinder, pedal housing and plumbing but am having difficulty finding where to connect the vacuum hose. I know it has to go to the manifold somewhere but there's no apparent place for the threaded fitting to go. The carb. spacer has a single port but this goes to the crank case breather via a one valve to control emissions, the rocker cover breather goes to a port on the carb. inlet. Has anyone got a similar vehicle equipped with a servo that they could have a peek at and see where the hose from the servo goes to please?.

Greg

Reply to
Greg
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Isn't there a boss (possibly still undrilled) on the inlet manifold itself? Possibly the branch that feeds the front two cylinders.

Reply to
Dougal

Yes, on the top, where you said, but he may have trouble raising a vacuum because of the emission control. He can block the emission control pipe under the carburettor or maybe even fit the servo pipe to this if he doesn't drill and tap the manifold.

Martin

Reply to
Oily

There are 2 different manifolds for servo and non servo vehicles. I believe the servo one is tapped and has a big pipe nipple right on the top of the manifold.

Reply to
Tom Woods

and on my 2.5 90 it's on the branch from No.4 cylinder if I remember correctly. Certainly at the back of the engine bay. Perhaps you need a new exhaust manifold too?

Reply to
Bob Hobden

I think it is right next to the carb on the 2.25.

Reply to
Tom Woods

I had to drill & tap mine to get the vacuum. Best done with the manifold off, otherwise you have to take extreme precautions to stop ally swarf from going into the pots.

Reply to
Duracell Bunny

I've found it, staring me in the face actually, what looked for all the world like the head of a mounting bolt is actually a bung in the pre-tapped hole in the manifold. Thanks to all for pointing me in the right direction. Greg

Reply to
Greg

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