Date: Fri, 26 Nov 2004 21:42:57 +0100
From: "OKOK!" <rootnospamlhost.not>
Subject: Re: Saab 99 water pump thread?

> > > > Helped me out after I broke the impeller using 2 screwdrivers ... :-( > > The good thing is I bought a manual after that. *grin* > > See, the thing is, there are those two holes through the casting. Why > they aren't tapped, for easier removal of the impeller, I can't imagine. > Yes, I remember those holes! I figure they let trapped air escape after filling up with coolant. One hole would cause imbalance... so there's two. (Just my guess .. :) I have thought really hard for a reason the thread on the shaft is left... its the only left-threaded thing in the car.... If you lift the shaft, it MUST turn a bit to get out of the gears in the engine that drive it. If you just lift the shaft, and not rotate at the same time it will never come out (and something will break.....! Gears maybe even.... ;) The shaft needs to turn counter-clockwise if I remember correctly.... and if they had used a right-thread then all you would achieve is unscrewing the tool from the shaft and pushing the shaft back into the engine. Pfew... kind of hard to explain.... but obvious when you have a good look at it. Richard.

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