Thread: Early 3.5 V8 Water Pump

Have you tried tightening the bolts?

Do not do this at home unless under adult supervision as bolts are known on rare occasions to break. I suggest that you spray the bolts with WD40 front and back for several days before attempting. It is actually the gasket leaking from the water passage to the bolt and then out, and probably corroded the bolt on the way through. Maybe have a spare bolt on hand. It would be preferable if the water pump is not leaking in the shaft to remove it and refit with a new gasket, and have a full set of spare bolts.
I have never seen one like the new pump. Maybe a fixed fan? Or maybe a serpentine so in that case it would go the other way. So be careful.
Regards Philip A

If you cut the long hub on the new pump near the middle so you can drill through to press against the bearing shaft, then a puller applied to the hub will get it off safely. Use a hacksaw at any distance more that the final needed shaft length. Any other way will damage the bearing. Any excess of bearing shaft can be cut off with an abrasive cutting wheel, just do it in short light bursts to prevent heating up the seals on the shaft.

When replacing the old hub make sure the shaft is supported under the pump impeller end so no axial load is applied to the body or impeller. Use a hint of oil and make sure the hub is pressing on absolutely square.

A bit of heat on the old hub will aid its removal and allow it to still press fit onto the new shaft. I usually get about 2 goes at pressing apart water pumps, after that everything goes loose and in your case pulleys could fall off.

Originally Posted by PhilipA

I have never seen one like the new pump. Maybe a fixed fan? Or maybe a serpentine so in that case it would go the other way. So be careful.
Regards Philip A

I have, on an early RRC or possibly a 3500 saloon. There is a cast pulley and viscous fan set that slides on and the nut retains the lot.

Thanks for the pointers.

Phillip - the pump is suspect and I have had to pull everything out anyway to get at it so I would prefer to change the pump - the pump is out of an early RRC and supposedly the same as my 101. Complicating the selection of pump is that my fan setup has been modifed to a fixed fan system.

I cut the hub on the new pump no problems. Unfortunately the hub is really tight and the puller would not move it and actually damaged the hub I was trying to move so I cut it off the shaft with the angle grinder. The shaft is exactly the same length as the shaft on my old pump.

I hope the hub on the old pump comes off OK - I don't want it damaged.

I will see what happens tomorrow.

Thanks for the help

Cheers

Garry

The new pump in the photo is common range rover 1978 through to 1983. The 4 bolt original item was used briefly in range rovers in 1977-78 then 1984 onwards, not sure of 101 versions though.

Originally Posted by Bent Series

The new pump in the photo is common range rover 1978 through to 1983. The 4 bolt original item was used briefly in range rovers in 1977-78 then 1984 onwards, not sure of 101 versions though.

Well that explains it then - the Aust 101s were made in 77 and into early 78.

Garry

Ok - managed to get the old water pump off and have changed the hub to the new water pump.

Phillip - you may be right - maybe some tightening was needed and a new bolt put in. I had to put in a new inlet manifold a while back and that required undoing some of the bolts to remove other ancillaries - this may have disturbed the seal of the gasket around the water pump in these areas - compounded by a missing bolt at the top which was allowing coolant to escape. You can see the dried fluid coming from where the bolt should have been


However, the weep hole also shows weepage


The impeller in water pump internals are in excellent condition considering the engine sat for nearly 10 years unused and with coolant in it. Note the cast steel/iron impeller and the number of blades.


The new pump has a cast alloy impeller with fewer blades - is this an issue


Thanks for the help

Garry

From the pic of the old pump it looks as though water is running out of the small hole below the shaft.

This is an early warning that the seal has gone and that the bearing will be next as water will start to get into it. Tightening bolts won't fix this.

On some cars I have been able to get the seal and bearing replaced but with the Landy I believe you will need to replace the pump.