Peter Delaney
GT40s Supporter
Hi guys,
I had a bit of vibration kick in above 4000rpm the other day, so got to looking - water pump pulley was wobbling 1/2 to 1mm at idle, but pulled into line with a few extra revs.
Pulled out the seats & engine panel, grabbed the pulley & sure enough - free play - clunk, clunk ! I loosened the belt & sure enough, it is the w/pump bearing (not just loose pulley bolts as I had hoped !) - out with the pump.
I have a new pump that I think came with the car originally, but it is quite different internally - it is the one on the left in the following pic.
Now for the questions :
- Is my old one on the right correct anyway ? I have V-belts, & it looks like it might be ok for a clockwise engine rotation (when looking at the front of the engine, or anti-clockwise when looking at the pic). The weird thing is that there is no "slant" on the blades like the new pump - all I can see it doing is throwing water outwards (& not very efficiently) no matter which direction it rotates.
- Is the new one (on the left) a serpentine belt version (reverse rotation) ? It sure looks like it would only work (sucking from the centre & spinning the water outwards) if it rotates anti-clockwise when viewed from the engine / clockwise when viewed in the pic).
Another interesting difference is the shape of the water ports in the cover plates - the old one on the right "sort of" matches the shape of the water ports in my timing chain cover (square), but the holes in the new pump plate are round.
Any guidance as to which pump is correct for my V-belt setup would be greatly appreciated.
Kind Regards,
Peter D.
I had a bit of vibration kick in above 4000rpm the other day, so got to looking - water pump pulley was wobbling 1/2 to 1mm at idle, but pulled into line with a few extra revs.
Pulled out the seats & engine panel, grabbed the pulley & sure enough - free play - clunk, clunk ! I loosened the belt & sure enough, it is the w/pump bearing (not just loose pulley bolts as I had hoped !) - out with the pump.
I have a new pump that I think came with the car originally, but it is quite different internally - it is the one on the left in the following pic.
Now for the questions :
- Is my old one on the right correct anyway ? I have V-belts, & it looks like it might be ok for a clockwise engine rotation (when looking at the front of the engine, or anti-clockwise when looking at the pic). The weird thing is that there is no "slant" on the blades like the new pump - all I can see it doing is throwing water outwards (& not very efficiently) no matter which direction it rotates.
- Is the new one (on the left) a serpentine belt version (reverse rotation) ? It sure looks like it would only work (sucking from the centre & spinning the water outwards) if it rotates anti-clockwise when viewed from the engine / clockwise when viewed in the pic).
Another interesting difference is the shape of the water ports in the cover plates - the old one on the right "sort of" matches the shape of the water ports in my timing chain cover (square), but the holes in the new pump plate are round.
Any guidance as to which pump is correct for my V-belt setup would be greatly appreciated.
Kind Regards,
Peter D.