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MG MGB Technical - Water pump and fan, advice.

Hi all,

I have recently bought a water pump to replace my broken one on my 73 BGT and I was about to put it on today but I wasn't happy with the condition of the existing bolts. What bolts do I need to replace them and where can I get them from?

Also whilst I have the fan off and I'm tidying up the engine bay I'm going to recondition my fan but giving it a luck of paint. Is there any suggested paint to use? Or is it just a case of spray can from my local car parts outlet? I know the process of how to spray things just wondering if anyone would use a different top coat or just a yellow I can find?

Thanks in advance.
Ricey
MD Rice

Same as you took off! The one that has the alternator bolted to it is UNF and longer than those that screw in to the engine block which are probably UNC. all 1/2" AF. MGOC show one length. Moss shows the two.

http://www.mgocspares.co.uk/acatalog/WATER_PUMP.html#l56

http://www.moss-europe.co.uk/Shop/ViewProducts.aspx?PlateIndexID=7975


I used spray from local parts place for my engine bay recently. Seemed to work
Michael Beswick

Bolts depend on the engine you have. A UK up to Nov 73 (build date) would originally have been an 18V 581/582/583 with HS carbs. After that it would have been an 18V 779/780 with HIF. According to the Parts Catalogue the earlier used 2 short 5/16" UNF x 1 3/8" and 2 long 5/16" UNF x 1 7/8", the later used 3 short 5/16" UNF x 1" and 1 long 5/16" UNF x 1 3/4".

I used Plastikote yellow for my fan as it gives a thick powder-coat like finish. Who knows what the 'correct' colour is, being clearly visible when rotating is the most important thing.
Paul Hunt

if it's a metal fan best to renew the rubber grommets too if they're worn or perished, firms things up too so perhaps less noise
Nigel Atkins

Thank you everyone for the advice it's been really helpful :)
MD Rice

Another aspect I should have mentioned is that there are short-nosed pumps and long-nosed. These are interchangeable on engines like the 73, but the two types may need the different length bolts. If you have a short-nosed then you need a shallow pulley and a spacer between the pulley and the fan or the fan hits the block when fitted the correct way round. If you have a long-nosed pump you have a deep pulley and no spacer, and if the fan is put on the wrong way round it could hit the rad. When you have the spacer you need longer screws for the fan than otherwise.
Paul Hunt

This thread was discussed between 20/11/2013 and 22/11/2013

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