Im in the process of a head gasket replacement on my 97 Mk3 1.6 8 valve Vauxhall Astra, which as most of you will know, it involves removing the aux belt and cam belt. Its at this stage where i have ground to a halt..
Im struggling with the timing belt tensioner, it seems to be in some way intergrated with the water pump. Is that right? If so do i need a special tool or adapter to take the tension off the belt to remove it??
Alrite, engine should be pretty much same as Nova GSI ? if it is then yeah you need a special tool, its a 46mm spanner kinda bent in to a U shape ?!
You loosen off the 3 bolts securing the water pump then turn it (can't remember which way !) this will loosen the belt, then to retension you turn the pump untill the belt is tight then nip up the 3 bolts again !?!
Where abouts are you ? i was given a set of Sykes-Picavant tools for doing belts / water pumps on Vauxhalls, might be able to lend you them if you get stuck ??
I think the Mk3 1.6 8v engine uses the same setup as the 1.4 where the belt tensioner is concerned. There's a metal arm with an allen key shaped hole in it at the back of the tensioner. Twist the arm around with an allen key until you can push the allen key into another hole behind the tensioner in the backplate. This will lock the tensioner in position and allow you to swap the belt. When you're replacing the belt, make sure all the slack is on the tensioner side of the cam and crank pulleys. Once the belt is on, pull the allen key out of the hole and turn the engine over a few times by hand to make sure the timing marks are still lining up properly
Anyway, ive managed to locate the tensioner allen key hole and its locked into position, but the belt is still tensioned. I could probably slide it off with some gentle pressure but i thought it would just drop off with the tensioner locked?
Does the auto tensioner mean i dont need to buy the special tool?
Ok head gasket is now done and all the bits are back in place..
Just one more quick question, is it normal after a head gasket change for there to be some light smoke from around the engine? The manifolds arent blowing and the car runs just fine. Is this just the engine "settling in" again after dismantling??