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Merc 208 van smoking

Bro-in-law's 208 started puffing out blue/white smoke so it just went in for a compression test - 280-300 for each pot but should be 400. It sounds like general wear but until last week it was running perfectly and always has done - no smoke at all, even on full chuff.

Any ideas what else it might be? It's blowing through the oil filler cap too so I suggested valve seals to the mechanic but he thought not.

It's billowing out smoke now - LOTS of it, and using plenty of oil.

Si

p.s. Also, one of the tappets has got very noisy over the last few weeks.

Reply to
Mungo "two sheds" Toadfoot
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p.p.s It starts really easily and runs as well as it ever did - apart from the smoke!

Si

Reply to
Mungo "two sheds" Toadfoot

Check the crankcase breathers. If they get blocked and the crankcase itself gets pressurised as a result, then the pressure will force oil past the rings and the valve-guides and into the cylinders. You'll also get a lot of blowing out the oil-filler-cap. I've seen an engine with blocked breathers develop so much pressure it blew the dipstick out the disptick- tube, followed by a few pints of the contents of the sump...!

Reply to
PJML

in

Thanks, I'll check them. That did cross my mind but I didn't think there'd be enough pressure to make it smoke like it does.

But then if it can do that............!

Si

Reply to
Mungo "two sheds" Toadfoot

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