Mercury v6 outboards common fault

[nugent]

After doing lots of searching on engine failures I always find them with blown cylinders
no 4 Allways goes any one know why? Curious to know. I have now discoverd 5 blocks all requiring a liner on number 4

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[A1an]

Leaning out at high revs?

[Turbodiesel]

Originally Posted by nugent

After doing lots of searching on engine failures I always find them with blown cylinders
no 4 Allways goes any one know why? Curious to know. I have now discoverd 5 blocks all requiring a liner on number 4

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Cylinders 3 and 4 run the hottest temperatures.

[9D280]

I found something similar on the Clamshells..... Always the top, unlike the usual inline 3 cyl trick of killing the middle.

T'was a combination of cooling & running lean. Top carb on later models had a slightly bigger jet, along with big cooling mods to get more water through like smaller tellale nozzle, removal of thermostat / poppet valve.....

Yes it's a bit grumpier at low RPM and the telltale looks more like a dripping tap at idle (clears the toobs at >1500rpm!), but it should now be reliable.