I have a ‘67 Merc 500 that had an issue where it wouldn’t idle well in water and sometimes would bog down when trying to accelerate. I found that there was water being pushed out between the #2 spark plug threads; tore it down and found there was a crack in the inner water jacket baffle plate right next to the #2 cylinder, so the cylinder was sucking in water and therefore wasn’t running well. There was no apparent damage to any other components. Thankfully I was able to get a brand new plate and the motor has run wonderfully ever since.
I did so many of these in salt water useage in 1980s . Pistons melted one overheat event . Reed valves swallowing disaster motors. Terrible design. Nice channel 👍
When alcohol was introduced for the second time for good all the manufacturers had similar problems the v designs were and are more tolerant , stuck rings , predetonation were somewhat solved by TCW 3 oils . also sounds like you worked for a dealer who sold go fast boats 90 % of my business was commercial clammers and lobstermen
@@pinetreeboatingclub I did both commercial and pleasure. Mercury has rusted drive shafts shift shafts rotted blocks exhaust covers ignition failure on triggers no overheating alarm. In 1984-87 carb floats actually melted from alcohol true . And new synthetic oils really helped also . These Mercs Chrysler Force ,OMC and Mercruiser put me through University engineering degree 😆 Kept me busy all winter. Amazing we have V4 Evinrude Johnson 1970s and 3cylinder still running . So sad OMC gone now . Yamaha Suzuki took over . Yamaha stole OMC and Merc technology. I have a 1990 50hp Yamaha all original except plugs and water pump rubber impeller. Salt is starting to dissolve these 1990s Japan motors now. I had the tools to install Pistons in those 6 cylinder Mercs except the 140 which had holes in piston skirts . Reed valves and number 2 and 3 pistons would melt stick rings one overheat event I recall. Nice videos thank you 👍
I have a ‘67 Merc 500 that had an issue where it wouldn’t idle well in water and sometimes would bog down when trying to accelerate. I found that there was water being pushed out between the #2 spark plug threads; tore it down and found there was a crack in the inner water jacket baffle plate right next to the #2 cylinder, so the cylinder was sucking in water and therefore wasn’t running well. There was no apparent damage to any other components. Thankfully I was able to get a brand new plate and the motor has run wonderfully ever since.
I did so many of these in salt water useage in 1980s .
Pistons melted one overheat event .
Reed valves swallowing disaster motors.
Terrible design.
Nice channel 👍
When alcohol was introduced for the second time for good all the manufacturers had similar problems the v designs were and are more tolerant , stuck rings , predetonation were somewhat solved by TCW 3 oils . also sounds like you worked for a dealer who sold go fast boats 90 % of my business was commercial clammers and lobstermen
@@pinetreeboatingclub I did both commercial and pleasure.
Mercury has rusted drive shafts shift shafts rotted blocks exhaust covers ignition failure on triggers no overheating alarm. In 1984-87 carb floats actually melted from alcohol true .
And new synthetic oils really helped also .
These Mercs Chrysler Force ,OMC and Mercruiser put me through University engineering degree 😆 Kept me busy all winter.
Amazing we have V4 Evinrude Johnson 1970s and 3cylinder still running .
So sad OMC gone now .
Yamaha Suzuki took over .
Yamaha stole OMC and Merc technology.
I have a 1990 50hp Yamaha all original except plugs and water pump rubber impeller.
Salt is starting to dissolve these 1990s Japan motors now.
I had the tools to install Pistons in those 6 cylinder Mercs except the 140 which had holes in piston skirts .
Reed valves and number 2 and 3 pistons would melt stick rings one overheat event I recall.
Nice videos thank you 👍