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Merlin 53 Piston

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Merlin 53 Piston

Post  trickydicky on Mon Jun 13, 2016 5:25 pm

I would like to know if anyone knows the sizes of the bushes in the merlin piston. Measuring them is not easy as they are badly worn as is the little end bush. I am sure it can't be too difficult to press out the old and press in the new but need to buy the right ones. Any technical data available?

Thanks

TD
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trickydicky

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bushes

Post  piston 197 on Mon Jun 13, 2016 7:06 pm

The bushes in the piston are integral with the piston and obviously have the circlip grooves in them, almost certainly you will need a new piston, let me know what size you need as I may have one in stock, the small end bush is a replacement item and is available from Villiers services
JH
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piston 197
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Re: Merlin 53 Piston

Post  trickydicky on Mon Jun 13, 2016 7:28 pm

Hello JH,

That's interesting because I did wonder whether they were an integral part of the piston. I used to work for AE Wellworthy many years ago and we did cast bushes in on some Hepolite pistons.

As for the size I assume you mean do I want an original or oversize +015 ?. There is a mark on the inside of the crown '7 E C' and its nominal dimensions are 2.689" long x 1.963" diameter (nom). The piston itself is not scored or has signs of any blow-by and the barrel is clean as a whistle and the rings very springy. I can't afford to re-bore so I reckon an original would be the best bet. Let me know what you think.

Thanks,

TD
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piston

Post  piston 197 on Mon Jun 13, 2016 7:33 pm

If you are measuring the piston in the correct place ? i.e. at 90 deg to the pin at the bottom of the skirt ? then 1.963" is 49.86mm so it is conceivable your bore is a STD 50mm bore, but you should be measuring the bore not the piston which if STD will be 50mm ?
I will look tomorrow and see if I have a new 10D piston on STD, unless you measure the bore and let me know if this is incorrect ?
JH
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piston 197
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Re: Merlin 53 Piston

Post  trickydicky on Mon Jun 13, 2016 7:50 pm

Hi,

So I have measured the bore and it seems to be about 49.98mm ~ 49.93mm so I guess pretty much 50mm.

Cheers,

TD
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trickydicky

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STD bore then ?

Post  piston 197 on Mon Jun 13, 2016 7:53 pm

I will look tomorrow and send you a message, if I have one it will be boxed, new old stock, and complete with rings, pin and clips ,definitely have some, it is just whether I have a STD or not ?
JH
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piston 197
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Piston

Post  piston 197 on Tue Jun 14, 2016 6:36 am

Yes have a new old stock Villiers 10D/13D ( same piston) in stock in STD size, new old stock , complete with rings, pin and clips will send you p.m. with details .
JH
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Re: Merlin 53 Piston

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