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Aluminium Castings Seized
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Classicars



Joined: 07 Feb 2011
Posts: 58

PostPosted: Tue Jun 11, 2019 6:14 pm    Post subject: Aluminium Castings Seized Reply with quote

Hi,

Can anybody give ideas on how to remove a seized aluminium water casting from a cast iron waterpump please? This is held by 3 studs and not bolts which makes it difficult to tap to release the corrosion.

Thanks for all ideas.
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Penman



Joined: 23 Nov 2007
Posts: 3945
Location: Lancashire

PostPosted: Tue Jun 11, 2019 7:10 pm    Post subject: Reply with quote

Hi
If it is still basically altogether and running, how about building pressure in the system by running the engine?
Or using a spare rad cap with a tyre valve fastened through a hole in it and a tyre pump to pressurize the system
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Classicars



Joined: 07 Feb 2011
Posts: 58

PostPosted: Tue Jun 11, 2019 7:23 pm    Post subject: Reply with quote

The waterpump has been removed and to get to the thermostat I have to remove the aluminium casting which shows that it is heavily corroded. I think that the best thing is to heat the aluminium casting and try to tap it may be it will move.
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Classicars



Joined: 07 Feb 2011
Posts: 58

PostPosted: Tue Jun 11, 2019 7:23 pm    Post subject: Reply with quote

The waterpump has been removed and to get to the thermostat I have to remove the aluminium casting which shows that it is heavily corroded. I think that the best thing is to heat the aluminium casting and try to tap it may be it will move.
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BigJohn



Joined: 01 Jan 2011
Posts: 865
Location: Nr. Lancaster

PostPosted: Tue Jun 11, 2019 10:16 pm    Post subject: Reply with quote

I had this problem on a Standard Flying 8 cylinder head many years ago, I found a bit of thin wall pipe the same bore as the stud diameter, hacksawed some serrations, gently tweaked them, tempered it, then drilled it down using the stud as a guide, frequently removing and not allowing it to get hot, using an airline to clear the muck out. It's verdigris corrosion that has a grip. I had enough clearance in the head to do this, as it was not all the studs that were gummed up.
On my Rover V8 I had, I knew the water pump I was changing was scrap so I bought one of these to fit:
https://www.ebay.co.uk/itm/6mm-100mm-Diamond-Hole-Saw-Drill-Core-Bits-Tile-Ceramic-Porcelain-Stone-Marble/372541931124?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D58656%26meid%3D26231c4d9518409e9114c1286b63a6ba%26pid%3D100008%26rk%3D1%26rkt%3D12%26sd%3D113721594653%26itm%3D372541931124&_trksid=p2047675.c100008.m2219
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1974 Mk1 Escort. 1992 Mk1 Golf Clipper Cabriolet Auto.
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