Isuzu Trooper Owners Club UK™

jonkem · Posted: Sun Mar 12, 2006 1:33 Post subject: Servo vacuum supply resevoir?

Getting near to the end of a MK1 bobtail Trooper build and have come up with a question! I'm putting a 3.1 into what was a 2.8 car and there is quite a difference in the brake servo set up. The 2.8 had a lightweight plastic tank connected to the vacuum pipe (it sat under the front wing), naturally I did the sensible thing and threw it away with all the other bits I should have kept and now wonder if the 2.8 servo that I'm keeping will need this part in-line.
The 3.1 donor doesn't have the tank but is a different vacuum pump & servo. The 2.8s in Frontera's have the 3.1 servo and have a different type but similar plastic tank..GRRRRRRRR
As the tank is pretty flimsy it can't hold that much vacuum so wouldn't be much of a resevoir...or would it?

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Lynn Johnson · *** Joined: 19 Jul 2003 Posts: 225 Location: Aberdeenshire

this is a reversal of the pint into a quart pot question, think about it that way and you have the answer Laughing

jonkem · Posted: Sun Mar 12, 2006 16:59 Post subject:

I'm thinking of the negative pressure on the thin plastic walls rather than volume of the tank.

Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

if it works on one vehicle why wont it work on another

the vac pump on both vehicles are the same and run on the rear of the alternator

siweb · ******* Joined: 18 Apr 2004 Posts: 1590

I got a question about this plz.
I noticed today that where the pipe from the servo connects to pump at the other side is a pipe nipple but no pipe on it should they be? I my have nocked one off but carn't see one spare Confused

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Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

is it the oil return hose to the sump there should be 3 connections oil feed on the back of pump vac off top and oil return off bottom

siweb · ******* Joined: 18 Apr 2004 Posts: 1590

It a small pipe on the top opposite the pipe that comes from the servo. only small like those vacuum pipes that run along the top of the engine.
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jonkem · Posted: Sun Mar 12, 2006 21:00 Post subject:

Yes the pumps are the same style but the servo's are quite different. What is the purpose of this tank on 2.8s?

SIWEB:- If it sucks when the engine is running it would be a fair guess that a pipe should be fitted.

siweb · ******* Joined: 18 Apr 2004 Posts: 1590

Well the brake pedal was just solid no movement and no brakes Confused

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i'll shut-up anyway it your thread not mine Laughing

Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

all diesels have a vac reservoir the purpose is that it provides a constant vacuum under normal braking
as can be tested if you pump the pedal fast enough you should be able exhaust the vac and bring the light on the dash on
if there were no reservoir this would happen under normal braking

siweb the small pipe you refer to goes over to the egr system i think or to the turbo

siweb · ******* Joined: 18 Apr 2004 Posts: 1590