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Re-Commissioning Project; 1931 Austin 12/6 - Wish me Luck!


tommotech

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A friend in need is a pain in the arse, especially when they persuade you to get their car going that they bought blind at an auction. Not that much persuasion was needed, the thing is quite charming really.

 

However, the engine wouldn’t turn over by hand and the starter had been disconnected sometime before the sale.

 

Soaking the bores in diesel didn’t budge things and there was evidence of water entry on cylinders 2, 3 & 4. Having some time available yesterday and today the head was stripped off the engine, revealing water damage to the bores of those cylinders and the engine still failing to budge.

 

Having previously used Coca-Cola to release seized injectors a bottle was purchased and poured onto the pistons, then left to soak overnight. Hey presto the engine turned over after some jostling, but locked up after half a turn.

 

It was also noted that the valves were not operating when the engine was turning and that a couple of valves were stuck wide open. Damn, the unit has to come out to be stripped, secretly I’m looking forward to getting into this job.

 

I’m not looking forward to procuring parts made of unobtanium though!

Anyone that has contacts or recommendations for old Austin parts please let me know.

 

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Strip it first and see the damage. I'd wager the valves can be cleaned up and re-used, and pistons too provided they're not melted or badly scuffed. You might get away with new rings, honing the bores and a crank polish/re-grind and bearings.

 

Any idea as to how it seized?

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I gather sometimes it's from them not being run/stored with antifreeze which then cracks the block too.  Amazingly, even when a block has cracked folks can still repair them successfully.

Depending on the location and size of cracks it may be possible to simply have them vacuum infused with sealant, if more extensive then having the cracks stitched may be necessary to stop them growing.

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Had to visit a client in Cheltenham today so went to meet Mark at Alderton Austin Services, really helpful and it seems that new pistons and a reborn can be had for £500 to £600.

 

Looks like a rebuild could be done for less than a grand, unless the white metal needs replacing and scraping on the crank bearings, not counting labour of course.

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Strip it first and see the damage. I'd wager the valves can be cleaned up and re-used, and pistons too provided they're not melted or badly scuffed. You might get away with new rings, honing the bores and a crank polish/re-grind and bearings.

 

Any idea as to how it seized?

Head gasket breached, possibly after overheating. It’s clearly stood a while though, with water in the cylinders.

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How flat is the head and the top of the block?

Is there a tappet chest on the side of the engine that you can remove the collets and springs from the valves so you can the work on gently removing them and see if you can get the bottom end to revolve fully?

Head will go for pressure test / skim if necessary. The engine turns now but locks up after half a turn and the valves fail to operate when the engine rotates, with some valves being stuck fully open.

 

Engine will be coming out for a full strip.

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  • 2 weeks later...

Engine is out now and further investigation shows that the timing chain is actually good. The water entry into the cylinders had seized the valves in their guides, all turns nicely now it’s been freed off.

 

Cylinder bores won’t hone out though, so the block will be going for rebore.

 

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