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Old 11 June 2012, 14:42   #1
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Mercury v6 outboards common fault

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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Old 11 June 2012, 16:08   #2
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Leaning out at high revs?
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Old 11 June 2012, 16:13   #3
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Quote:
Originally Posted by nugent View Post
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.
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Old 12 June 2012, 06:21   #4
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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.
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