Fv2923

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tambikeboy
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Fv2923

Postby tambikeboy » Thu May 17, 2018 11:00 am

And another fv2923 some later parts fitted shouldn't be to hard to bring back to original these canted tank's really do me in... :twisted:
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Gannet
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Re: Fv2923

Postby Gannet » Thu May 17, 2018 9:02 pm

Well done Tam,
These early FVs in my biased opinion are the very best! To find one in running order is unusual.
I also think that these early FVs are best suited to the small round tank.
I am sure you will be able to replace some of the later parts which have been fitted.

Jeremy

tambikeboy
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Re: Fv2923

Postby tambikeboy » Sun Aug 12, 2018 9:52 am

Fv2923 picked up today 380 miles and a short sail on a ferry came home with a S.D destination Italy I must be mental...
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Nudge
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Re: Fv2923

Postby Nudge » Sun Aug 12, 2018 11:43 pm

I must be mental


A bit like ALL of us..... Why else would we do this? :lol:
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Oyster 49
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Re: Fv2923

Postby Oyster 49 » Sun Aug 19, 2018 11:29 am

Nice one 8) Any pics of the SD?

tambikeboy
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Re: Fv2923

Postby tambikeboy » Sun Aug 19, 2018 1:36 pm

Still have sd in my possession will be shipped out next weekend will leave pic upload for new owner ( other S. O. S member) in the meantime fv2923 is running like a bag of spanners full strip down showing head serious corrosion metal caskets to thick and more later parts fitted (have most available)
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Gannet
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Re: Fv2923

Postby Gannet » Sun Aug 19, 2018 6:26 pm

Hi Tam,

Nothing like an early FV to restore!
I find it difficult to see how much corrosion the head has. I had a corroded head filled with weld. It was a simple matter to file it flatish and then use wet and dry paper in conjunction with a very flat surface to restore it to a igh degree of flatness. I know that those with machine shops will say machine it, but it is easy to get it very flat in the way have described. Good luck.

Is the crankcase corroded as well ?

The idea of the steel plates, which were originally completely covered with a black sealant, was to keep water away from the aluminium and thus prevent electrolytic corrosion. I suspect this was not understood by subsequent rebuilders. The plates were not just simple gasgets sealing the cylinder from the water.

Why do you say the plates in FV2923 are too thick?

These are excellent engines. I am off tomorrow for some boating in South Devon for a week or so, taking FV2682 to use on the dinghy in the estuary.
FV2682 and FV2923 were probably produced about a month apart around approx. May/June 1950.

All the best Tam.

Jeremy

tambikeboy
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Re: Fv2923

Postby tambikeboy » Sun Sep 02, 2018 3:55 pm

Why do you say the plates in FV2923 are too thick?

Big difference in thickness Jeremy whether it makes a difference is another question....
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Charles uk
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Re: Fv2923

Postby Charles uk » Sun Sep 02, 2018 4:43 pm

All the original ones I measured Tam were 18 gauge, 0.048" about 1.2mm, but I only measured 4 or 5 that I would bet were original.

You seem to have 2 bottom plates, the top ones didn't have transfer port notches.
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tambikeboy
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Re: Fv2923

Postby tambikeboy » Sun Sep 02, 2018 5:46 pm

Illustration purposes only C have a set cheers
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Gannet
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Re: Fv2923

Postby Gannet » Thu Sep 06, 2018 10:44 pm

I have just got back from a holiday using FV2682 in the Yealm estuary on my small dinghy in South Devon and FV5141 in Fowey in South Cornwall on an Avon Redcrest inflatable. Excellent engines - ideal for dinghy work.


Tam, in response to your question about whether plate thickness is important, I would say probably not as long as they are not too thick. My experience with FVs would suggest that they are often very gutless because of dimensional variations producing poor compression. I measure the clearance between the top of the piston and the cylinder head, using an L shaped piece of plastecene inserted through the plug hole. I think the ideal clearance should be about 4mm, although 5mm is still ok.
The length of the block and the depth of the head in my experience are the main causes of the variation. I have had to modify these parts to achieve a satisfactory compression. Performance, including starting is then very satisfactory.

Charles ,
Yes, I concur with your measurements that 0.048 seems to be the typical thickness of the plates.

Jeremy


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