logicaluk
Posted a lot
Every days a school day round here
Posts: 1,307
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I was over to my mate's place today making use of his facilities, and he showed me the Stag cylinder heads he had just got back from vapour blasting, they look amazing,  Amazingly corroded, that is. They are deeeeeep, apart from JB weld, the only thing we can think of is TIG welding to backfill the holes and skimming. Dose the RR brain trust have any other suggestions? |
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Rick wood engines does aluminum spraying
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stealthstylz
Club Retro Rides Member
Posts: 14,834
Club RR Member Number: 174
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Make sure you can get all the blast media out first, any blind holes left open will usually be chock full of it.
To repair you need to grind the rot right back to good alloy with a carbide burr in a die grinder, thoroughly clean it, build it back up with a Tig welder then remachine the water jacket holes. It's a incredibly time consuming/expensive process as the crappy old ally tends to leach impurities no matter how clean it looks. Last head I did was about £500 + all the other stuff needed to rework it as due to the welding the valve seats tend to shift so need to be replace or recut etc. It's only worth doing if good heads are completely unobtainable.
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goldnrust
West Midlands
Minimalist
Posts: 1,872
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My Daimler heads weren’t as bad as that, but they had rotted sections of aluminium around some of the coolant galleries that extended under where the head gasket seals. I had them welded up and then skimmed flat.
The area I needed doing would have been a fraction of what those heads need, but it did work.
If you can do the welding yourself it might still be economically viable, just time consuming?
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My Standard 12 head was similar. Bearing in mind it's a sidevalve head so mucho simple, it took hours of Tig welding to rebuild the rotten areas. I skimmed it myself as well so cost was not a consideration. The cost for two would have made me pause for thought.
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup SOLD
1953 Pop build (wifey's BIVA build).
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