USHM3 918cc side valve engine

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Alan Lane
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USHM3 918cc side valve engine

Post by Alan Lane »

I have a USHM3 918cc side valve engine. It doesn't run and needs a rebuild.

It has damaged cylinders and already has +60 pistons.

I don't have the option of using a modern engine as if i do I will have the Series MM lynch mob out to get me :D.

So i either need advice on getting this rebuilt or does anyone have a replacement ?

Can you still get Ex military engines to drop in?[frame]Image[/frame]
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bmcecosse
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Re: USHM3 918cc side valve engine

Post by bmcecosse »

It's either a rebore and sleeve, or - find alternative pistons and just bore it out to suit. I would remove the pistons and measure the gudgeon pin to crown height - and compare with say Minor 948 pistons etc to see if by any chance they are similar.
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mike.perry
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Re: USHM3 918cc side valve engine

Post by mike.perry »

Ex military engines do not just drop in, they provide a block and moving parts to which you have to supply the rest of the engine. See http://seriesmm.mmoc.org.uk Tech Info ex wd engines
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bmcecosse
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Re: USHM3 918cc side valve engine

Post by bmcecosse »

What's the availabilty of SV pistons these days?
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DAVIDMCCULLOUGH
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Re: USHM3 918cc side valve engine

Post by DAVIDMCCULLOUGH »

East Sussex Minors have +20, 30, 60 and standard listed, thought they quite pricey now. When I got mine from them in 2009 them were Australian made and seemed very good quality. Club spares are also likely to have some available.

Heres my engine rebuild from a few years age
http://www.mmoc.org.uk/viewtopic.php?f= ... 4&start=45


Too many Minors so little time.....
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Alan Lane
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Re: USHM3 918cc side valve engine

Post by Alan Lane »

How do i get my hands on an Ex military engine ?
What are they known as ?
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bmcecosse
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Re: USHM3 918cc side valve engine

Post by bmcecosse »

'Not common' - the way forward is going to be bore + sleeve, and then new pistons from ESM. Is the crank ok for a re-grind - or is it at bottom limits too?
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Alan Lane
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Re: USHM3 918cc side valve engine

Post by Alan Lane »

bmcecosse wrote:'Not common' - the way forward is going to be bore + sleeve, and then new pistons from ESM. Is the crank ok for a re-grind - or is it at bottom limits too?
Thanks. so the plan is to lift the engine and see what condition the bottom end is in.
I am not going to be able to do this for a few weeks now... so watch this space.
Al
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mike.perry
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Re: USHM3 918cc side valve engine

Post by mike.perry »

Alan Lane wrote:How do i get my hands on an Ex military engine ?
What are they known as ?
They are never around when you need one
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