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MG MGA - engine number

Hi all can't work this one out so throwing myself on the collective for guidance,I was asked if the engine in a pals 1961 coupe was original its a 1622 motor, the number is 12H412RS then 5 numbers
I just can't find any reference to this number apart from the 12 meaning 1200cc?
looked at goldseal numbers but no luck
Ian
Ian McGregor

My guess it is a recoonditiond engine and that is the reconditioner's number.

So It might be anything - even bits of different engines put together.
Chris at Octarine Services

I'm wondering if you are quoting the block number? Take a look at this www.mgaguru.com/mgtech/engine/ch100.htm

Graham V

The part number for the machines block on a MGA 1622 engine is 12H432. The casting number that you see cast in the side of the block (before machining) is different, I don't have these casting numbers recorded, but it may well be 12H412RS. The engine number should be found on a riveted plate in the ignition side of the engine, just below the head gasket. See here: http://mgaguru.com/mgtech/buying/buy101d.htm
barneymg

And in Australia the engine number is stamped directly into the cast block in the same position you see your riveted plate. I suppose the Aus. authorities thought the riveted plate could be removed/replaced at will so decided to make it more permanent.

Barry.
Barry Gannon

Hi all thanks for the reply's yes this is on the small aluminium plate riveted to the block . photo attached hopefully
looked a bit further into the motor today the rocker tappet pedestals are aluminium and have a revcounter take off so I think the origins are A ?

Ian McGregor

I've seen these before. Yes, the 12 should mean 1200cc. The "H" is supposed to mean "miscellaneous", so it may have been used in a hay baler or ditch digger or an irrigation pump. But with a tach drive, I dunno. Maybe some really small sports car around 1953? Does it have a a full flow oil filter, or bypass filtering?
barneymg

When I got my mga back in '88 (not a great example to start with), the engine was a 1500 gold seal rebuild #8G210RS28487.Ran good for quite a few miles. Finally found a rebuildable 1600 and rebuilt it. Still keep the 1500 under the workbench just in case. Marvin,ct
Marvin Stuart

This thread was discussed between 15/02/2018 and 17/02/2018

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