Thanks Lou, not clear - Grey Antifouling, in the Volvo Penta Grey. Works to an extent but i still try and give it a scrub halfway through the season. Looks good when the boat is first dipped though!
Chris - cheers mate
Well the boat went back in and i cracked on getting everything looking nice inside etc (always never ending, isn't it?!).
Plumbed up the hot water and immersion and that's working great now.
We took a trip 2 weekends ago to Guernsey, another of the Channel Isles near to me (circa 30 miles each way) and all seemed good, got there in 1hr 20 or so which i was happy with.
On the way back we caught about 2-3kts of tide and were making great speed - were being the operative word as 10 mins from the marina the engine note changed and i recall it sounding more like a diesel engine than a petrol one, if you follow.
There was a lack of power too over 2.5K Rpm. When i slowed i realised we'd "lost" a cylinder somewhere hence the sound and power loss. There was no overheat or Oil Pressure issues, both were steady in the middle of the gauges.
We tied up and i left it a couple of days whilst i sulked and swore a bit.
On Monday i went down to sort. Took a timing gun to rule out plug leads (simple things first!).
All leads were sparking, uh-ho.
Distributor cap off, a little corrosion but nothing to affect it - and of course as mentioned at idle all leads were sparking too.
Took the plugs out, and got my compression tester out and no compression at all on No 3 cylinder (Middle cylinder on the RHS bank as looking at the engine).
Squirt of oil in the cylinder and test again, no change - exactly the same. Strange.
So i tool the risers, manifold off and altenator etc. to get to the Valve cover.
When i took it off, it became apparent why:

I have never seen that before, a nut and retainer on a rocker come off? Seems strange to me. Anyhow, i got excited for a minute and put it back on to compression test, but to no avail - even with it on there wasn't any change on compression.
Looking through the exhaust port, the exhaust valve stem doesn't look too great, bit of corrosion and very mucky so i suspect it's not sealing properly at all, so i have pulled the head to clean and relap all valves in to ensure good seating etc.
Over the weekend i'll strip the head, check all valves are straight and guides aren't too worn and then next week rebuild back up.
Always something to do!!
More soon.
