Mercury 860’s
08-30-2024 | 10:14 AM
#21
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Joined: Sep 2013
Posts: 2,320
Likes: 1,040
From: Wisconsin
They do not desire for a lower priced engine.
08-30-2024 | 10:41 AM
#22
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Joined: Jul 2009
Posts: 826
Likes: 56
From: Fredericksburg, VA
I saw some people asking about longevity and what goes on with QC4V motors, and thought I’d shed some light. I am in no way a pro, but I too found lots of misinformation and lack of information before I bought an 1100 boat.
In the real world, if you take care of your equipment, people are regularly getting 400-450+ out of maintained 1100s. The ones that die an early death tend to be exclusively over heat and bad fuel related.
I’m told due to timing chain noise, Mercury built these motors with no knock sensor. A tank of bad fuel and you’ve got a problem.
Another issue that plagues these motors is cracking turbine housings. This is akin to a cracked CMI header on an N/A motor. There are some things you can do in ownership to extend the life of these, and obviously replacing these when they fail is key.
The factors that tend to lead these to rebuild are two main ones in my opinion. Oil consumption and valve lash. Rings can wear to a point that oil consumption is no longer reasonable. The second comes when valves have “tuliped” to a point where proper valve lash can no longer be achieved.
These motors were intimidating first… but once you’re around them they’re the closest thing to an outboard turned sideways you’ll ever find. I would never own another big power boat without QC4Vs
In the real world, if you take care of your equipment, people are regularly getting 400-450+ out of maintained 1100s. The ones that die an early death tend to be exclusively over heat and bad fuel related.
I’m told due to timing chain noise, Mercury built these motors with no knock sensor. A tank of bad fuel and you’ve got a problem.
Another issue that plagues these motors is cracking turbine housings. This is akin to a cracked CMI header on an N/A motor. There are some things you can do in ownership to extend the life of these, and obviously replacing these when they fail is key.
The factors that tend to lead these to rebuild are two main ones in my opinion. Oil consumption and valve lash. Rings can wear to a point that oil consumption is no longer reasonable. The second comes when valves have “tuliped” to a point where proper valve lash can no longer be achieved.
These motors were intimidating first… but once you’re around them they’re the closest thing to an outboard turned sideways you’ll ever find. I would never own another big power boat without QC4Vs
08-30-2024 | 12:16 PM
#23
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Joined: Jun 2007
Posts: 7,309
Likes: 1,815
From: Merritt Island, FL
Not that I am even close to being in the market but I think the issue most have is Mercury is the only source for parts for the motors.
I saw some people asking about longevity and what goes on with QC4V motors, and thought I’d shed some light. I am in no way a pro, but I too found lots of misinformation and lack of information before I bought an 1100 boat.
In the real world, if you take care of your equipment, people are regularly getting 400-450+ out of maintained 1100s. The ones that die an early death tend to be exclusively over heat and bad fuel related.
I’m told due to timing chain noise, Mercury built these motors with no knock sensor. A tank of bad fuel and you’ve got a problem.
Another issue that plagues these motors is cracking turbine housings. This is akin to a cracked CMI header on an N/A motor. There are some things you can do in ownership to extend the life of these, and obviously replacing these when they fail is key.
The factors that tend to lead these to rebuild are two main ones in my opinion. Oil consumption and valve lash. Rings can wear to a point that oil consumption is no longer reasonable. The second comes when valves have “tuliped” to a point where proper valve lash can no longer be achieved.
These motors were intimidating first… but once you’re around them they’re the closest thing to an outboard turned sideways you’ll ever find. I would never own another big power boat without QC4Vs
In the real world, if you take care of your equipment, people are regularly getting 400-450+ out of maintained 1100s. The ones that die an early death tend to be exclusively over heat and bad fuel related.
I’m told due to timing chain noise, Mercury built these motors with no knock sensor. A tank of bad fuel and you’ve got a problem.
Another issue that plagues these motors is cracking turbine housings. This is akin to a cracked CMI header on an N/A motor. There are some things you can do in ownership to extend the life of these, and obviously replacing these when they fail is key.
The factors that tend to lead these to rebuild are two main ones in my opinion. Oil consumption and valve lash. Rings can wear to a point that oil consumption is no longer reasonable. The second comes when valves have “tuliped” to a point where proper valve lash can no longer be achieved.
These motors were intimidating first… but once you’re around them they’re the closest thing to an outboard turned sideways you’ll ever find. I would never own another big power boat without QC4Vs
08-30-2024 | 02:03 PM
#24
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Joined: Jan 2006
Posts: 3,858
Likes: 790
From: St. Pete Beach, FL
08-31-2024 | 08:29 AM
#28
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Joined: Aug 2019
Posts: 1,215
Likes: 413
From: BC
These new large center consoles with 5+ outboards are ridiculous.
Likely a lot of the maintenance re-fresh times for Merc perf I/Os are based on valvetrain needs.
08-31-2024 | 08:33 AM
#29
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Joined: Aug 2019
Posts: 1,215
Likes: 413
From: BC
If they don't create a better option they'll price themselves out of a market, and reduce sales/buyers with a shrinking boating community.
Likely far less people with the desire/knowledge/facilities to work on their own boats these days.
Likely far less people with the desire/knowledge/facilities to work on their own boats these days.
