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No compression on Villiers Mk 20

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No compression on Villiers Mk 20

Post by Gubble1234 on Tue Feb 25 2014, 15:55

I'm nearing the end of the rebuild now, and everything is back on the engine.

The problem is, I have no compression. I've consulted my dad and his friend, and they have reground the valves and they should be all moving brilliantly now. There is plenty of compression on the piston, so the rings are okay.

There is no suction through the inlet valve, but you can feel air coming out of the exhaust, which I think is rather odd.

The only thing they can think of is the timing is wrong, but we took the head back off, and everything looked as though it was moving when it should. Also, I swear I lined everything up as it should have been in the crankcase.

Does anyone have any idea whats up?

Thanks,
Chris

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Re: No compression on Villiers Mk 20

Post by Villiers on Tue Feb 25 2014, 16:03

Ground the valves in? Have you re-adjusted the tappets?

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Re: No compression on Villiers Mk 20

Post by Gubble1234 on Tue Feb 25 2014, 16:33

Funnily enough, we just found that was what was wrong. I was reading the manual and came across the valve clearance page. There isn't a gap between the exhaust valve and the tappet.

Took all the shims out, still wasn't a gap, took the tappet off altogether, got brilliant compression!

Gonna take a tiny bit off the bottom of the valve to get the gap we need.

Thanks :P

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Re: No compression on Villiers Mk 20

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