Engineering Help !!

[ericw]

Hi !

As part of a general overhaul, I'm fitting a new shaft to a water pump on a Volvo 2003 as there are some signs of wear on the old one.

Besides the replacement seals, I'm also going to replace the bearings at the same time.

Question is : what is the best method for getting the new bearings onto the shaft ??

Somebody must have carried this operation out before - I've searched the
database, but don't seem to have any conclusive answers !

As always, any help greatly appreciated !

Regards,

Eric.

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[Chris_Stannard]

You must be careful to ensure that the bearing go on absolutely square. Depending on the shaft size and the bearing a large box spanner, with a nut in it to hold the spanner square to the shaft, but which can slide down the shaft is a good way of doing it. Then put a bit of wood over the end of the spanner and tap it down gently making sure that the bearing reains square to the shaft at all times, if it gets crooked you will need to start all over again with a new bearing.

Method not guaranted but it works for me

<hr width=100% size=1>Chris Stannard

 

[ccscott49]

I agree with Chris, but it might also be a help, to freeze the shaft for a night then heat the bearing in boiling water, you will find the bearing a lot easier to push on. One other tip, take it to a little engineering place and get them to press it on for you, for the price of a pint (wear your dirty overalls when you go there)

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[ericw]

Thanks very much for the advice, gents - most useful for an engineering novice like me ! I shall have a word with a friendly engineering unit in the yard.

Regards,

E.

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[pvb]

Seals...

Be sure to note which way round they're fitted!

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[mtb]

Nout wrong with this but better if you do it in a vice

Cheers
Mick

<hr width=100% size=1>smile you'l be on your boat soon ;-)
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[ericw]

SOLUTION !!

Just to update this thread for anybody doing a future search :

I used a vice to put the bearings onto the shaft, ensuring they were the positioned exactly as the originals. It's actually quite easy work, but take it slowly and ensure that the shaft/bearings are perpendicular to the vice.

The first 'problem' occurs once u have the first bearing and the spacer fitted to the shaft. U still need to push them further down the shaft in order to start fitting the second bearing. This was achieved by using a socket (from a socket set) which pushed on the spacer when clasped by the jaws of the vice, but which allowed the shaft to move up freely into the socket (similar to the box spanner idea in one of the earlier replies). The second problem encountered is once the second bearing is on the shaft. Both the bearings and spacer need to be moved further down the shaft and instead of using a box spanner with a nut I used a spark plug socket with a largish washer. The washer fitted over the shaft, but pushed onto the bearing and the spark plug socket enabled the shaft to move into its body as the vice was clamped steadily tighter. The only other difficulties encountered were fitting the two circlips - overcome by using the vice and a Phillips screwdriver !

In all it probably took about an hour and a half - could certainly do it faster 2nd time around - now I know the method !

Hope this is of some use to anybody else attempting to fit new bearings !

E.

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