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+--- Thread: What have you done today with your Austin Seven (/showthread.php?tid=1921)
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RE: What have you done today with your Austin Seven - charlie carpenter - 09-09-2020
On the way home from the Scottish Austin 7 rally many years ago my wife was driving the Ruby when it started to lose power. I checked and found no 2 cylinder was not firing. As we were only 10 miles from home she just nursed it home. I had a rebuilt engine for it just changed them over and stuck the old one in the shed. I took it apart today and the pictures show what I found. The car still ran totally quiet and the lower half of the piston went up and down as normal.
The top ring held the top part above the bore.
RE: What have you done today with your Austin Seven - Ruairidh Dunford - 09-09-2020
Chemical metal should sort that out Charlie.
RE: What have you done today with your Austin Seven - John Mason - 09-09-2020
I would not suggest this as a serious repair but what about aluminium welding followed by re machining back to size and re cutting the ring groove.
John Mason.
RE: What have you done today with your Austin Seven - charlie carpenter - 09-09-2020
Hi John I think I will just fit a new piston and rings as bore undamaged.
RE: What have you done today with your Austin Seven - Bob Culver - 09-09-2020
This sort of failure with that style of piston was not uncommon on other makes but the area of metal to finally fail was usually very small. Did a bearing run or cap loosen and allow the top ring to catch? Can also follow a cracked crown but evidence of blow by through the crack then usually evident.
RE: What have you done today with your Austin Seven - bob46320 - 09-09-2020
Apparently, during WW2, some piston replacements were made out of oak, limited life, but got you going for a bit.
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D3KDCd74myxk&psig=AOvVaw3TSuAlOywLCT0e4ZP3qDBB&ust=1599766635949000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCMiL4KLp3OsCFQAAAAAdAAAAABAD
RE: What have you done today with your Austin Seven - Nick Salmon - 09-09-2020
If it was running quietly, albeit a bit lacking in power, I would have left well alone... (that's a weak joke BTW)
RE: What have you done today with your Austin Seven - Robert Leigh - 09-09-2020
Charlie
You talk about a new piston, but how about a used one to match the others? I have a considerable collection of pistons, one of which might match the others. Send a PM if the idea appeals to you.
RE: What have you done today with your Austin Seven - charlie carpenter - 09-09-2020
That's kind of you Robert. The bearded wizard has sorted me out
RE: What have you done today with your Austin Seven - Bob Culver - 10-09-2020
When pistons fail from some fatigue process all usually ishow fatigue similary progressed. I would expect the larger area to be the fatigue crack but it usually dull.