2011 Mercury 75 HP 4 stroke

[NAGG]

Hi All

I know nothing about this motor . I know the 2014 motor is pretty good up & there with the likes of Suzuki & Yamaha

Are there any known problems or things to look out for the previous model Mercury 4 stroke (75HP)

The good , the bad & ugly ....

I know you guys would be all over this stuff

Chris

[gazza2006au]

I know everything about it i have the same engine.

[tunaticer]

That doesn't say a lot.....

[NAGG]

I know everything about it i have the same engine.

crickets .........

[NAGG]

That doesn't say a lot.....

probably says more than you would imagine ::)

Chris

[stevej]

If it has been serviced and looks well looked after how bad can any of the main brands four strokes be ?

Honda Yamaha merc Suzuki even a newish tohatsu
If it’s 12 years old and hasn’t died yet I’d say it would keep on going


just match the engine displacement to the weight of the hull of that makes sense


ole mate can always help you fix it

[NAGG]

If it has been serviced and looks well looked after how bad can any of the main brands four strokes be ?

Honda Yamaha merc Suzuki even a newish tohatsu
If it’s 12 years old and hasn’t died yet I’d say it would keep on going


just match the engine displacement to the weight of the hull of that makes sense


ole mate can always help you fix it

I dont know how well serviced this motor has been but it has ridiculously low hours for it's age ...... I'm really just after a general opinion of the motor itself - was / is it a good motor (reliable) .

If it was a Yammi 60 of the same vintage ...... I know that the motor was a very reliable one & very well regarded .

I ran the same hull with a 60 Yammi - which was OK - till it was overloaded - so a 75hp should be fine

Chris

[gazza2006au]

The good

Its a L4 block they were sold around the world as 75hp, 80hp, 90hp, 100hp, 115hp

The L4 block is shared with the Verado 175hp only difference is the 175hp is supercharged they still share the same short block powerhead

There are no valve adjustments ever needed, the powerhead is all bolted together with very long bolts running right thry from the head to the crankcase so there isno just removing the head for a service

I also have the 115hp crankshaft to turn your 75hp into a 115hp but i don't have the 115hp ECU, the two things you need for an upgrade

This engine is a 1.73 litre and has rediculous power my 90hp pushes my 19ft 740kg empty hull with 400kg of adults on top to 60kph

The engine has Mercury Guardian which will look after you and in certain cases limp mode will reset when u throttle back below 2500rpm

The bad

They suffer leaking head gaskets which end catastrophically mine was the first i seen than i seen 10's of the same over the past 2 years the head gasket leaks water into the combustion chamber doesn't compress than snaps the conrod than rodney says hello out the side of block

If you take the fuel filter off the engine an install a new fuel filter you will run into problems with the engine running like shit, you need to key on than release air from the fuel rail theres a schrader valve on the top of the fuel rail repeat 2x 3x than the engine will run perfect

That's it

Mines been an awesome engine starts pretty much instantly first time after sitting 5 months, they are tempremental on old fuel 10-11months old quiet easy to pick up it has the slightest miss

Engine is very quiet on the flush and very quiet in the water the pee'ing water is louder than the engine

The little plastic fuel hose connector at the engine often go brittle and break i made a new connector on my lathe from a steel bolt so it will never break, also these engines dont run a primer bulb they have a low pressure fuel pump (pick up pump) that primes the fuel

[NAGG]

The good

Its a L4 block they were sold around the world as 75hp, 80hp, 90hp, 100hp, 115hp

The L4 block is shared with the Verado 175hp only difference is the 175hp is supercharged they still share the same short block powerhead

There are no valve adjustments ever needed, the powerhead is all bolted together with very long bolts running right thry from the head to the crankcase so there isno just removing the head for a service

I also have the 115hp crankshaft to turn your 75hp into a 115hp but i don't have the 115hp ECU, the two things you need for an upgrade

This engine is a 1.73 litre and has rediculous power my 90hp pushes my 19ft 740kg empty hull with 400kg of adults on top to 60kph

The engine has Mercury Guardian which will look after you and in certain cases limp mode will reset when u throttle back below 2500rpm

The bad

They suffer leaking head gaskets which end catastrophically mine was the first i seen than i seen 10's of the same over the past 2 years the head gasket leaks water into the combustion chamber doesn't compress than snaps the conrod than rodney says hello out the side of block

If you take the fuel filter off the engine an install a new fuel filter you will run into problems with the engine running like shit, you need to key on than release air from the fuel rail theres a schrader valve on the top of the fuel rail repeat 2x 3x than the engine will run perfect

That's it

Mines been an awesome engine starts pretty much instantly first time after sitting 5 months, they are tempremental on old fuel 10-11months old quiet easy to pick up it has the slightest miss

Engine is very quiet on the flush and very quiet in the water the pee'ing water is louder than the engine

The little plastic fuel hose connector at the engine often go brittle and break i made a new connector on my lathe from a steel bolt so it will never break, also these engines dont run a primer bulb they have a low pressure fuel pump (pick up pump) that primes the fuel

Thanks for that Gazza.

Is there are cause of the leaking head gaskets ? - is this something that just happens over time or running hours ? Are we talking 200 , 500 , 1000 hours in other words can you plan to replace the head gasket to avoid a failure .

Chris

[stevej]

Removing head bolts for a service, that’s not a service that’s a rebuild


and nagg the unfortunate thing is pre covid it would be a 2-3k engine and could just treat them as disposable
If it lasted a few years then who cares

now they are asking second hand what they were new even two years ago

I’d be trying to find someone who’s doing a few hours with theirs for advice

if it is tidy and has been serviced and hasn’t been pulled apart for a major repair it will be ok

[NAGG]

Removing head bolts for a service, that’s not a service that’s a rebuild


and nagg the unfortunate thing is pre covid it would be a 2-3k engine and could just treat them as disposable
If it lasted a few years then who cares

now they are asking second hand what they were new even two years ago

I’d be trying to find someone who’s doing a few hours with theirs for advice

if it is tidy and has been serviced and hasn’t been pulled apart for a major repair it will be ok

This motor has less than 50 hours on it ....... yes you heard right

Chris

[stevej]

Again as long as he serviced it now and then

I looked at a 6 year old 40 hp merc four stroke that had three hours on it
It had never seen a dealer even for the first ten hour service

so we did a water test and I said I’d take if he serviced it.
Mechanic broke two gearbox bolts as they had seized in
that first service or first years would have had those bolts relubricated as per the manual


Super low hours isn’t always a good thing

[NAGG]

Again as long as he serviced it now and then

I looked at a 6 year old 40 hp merc four stroke that had three hours on it
It had never seen a dealer even for the first ten hour service

so we did a water test and I said I’d take if he serviced it.
Mechanic broke two gearbox bolts as they had seized in
that first service or first years would have had those bolts relubricated as per the manual




Super low hours isn’t always a good thing

Yeh , very true .

I dont know the service history - I just know it was recently serviced .

Chris

[gazza2006au]

Mine plus a couple others have had the head gasket leak and conrods snap under 100 hours on the engine, i donno if theres any maitinence to stop them leaking other than tearing it down and replacing the head gasket

They were a $4500 engine pre covid, they are worth around $6000-$6500 now

[NAGG]

Does anyone know if the digital Mercmonitor gauges will work the 2011 Merc 4 stroke ?

Chris

[gazza2006au]

I have Mercury Vessel View Mobile connects the engine to my phone for live engine data if i had the $500 it cost now i would connect the engine with my sounder for engine data as phone isnt waterproof

Another thing the plastic top rear of cowling the handle bit snaps as the plastic gets brittle and that part is NLA

[NAGG]

I have Mercury Vessel View Mobile connects the engine to my phone for live engine data if i had the $500 it cost now i would connect the engine with my sounder for engine data as phone isnt waterproof

Another thing the plastic top rear of cowling the handle bit snaps as the plastic gets brittle and that part is NLA

Thanks Gazza - but I really just want to know if the new digital gauges work with this motor - I believe they do but wanting to make sure.

NLA ?

Chris

[Dignity]

Thanks Gazza - but I really just want to know if the new digital gauges work with this motor - I believe they do but wanting to make sure.

NLA ?

Chris

No Longer Available. Find someone with a 3D printer, you'd have contacts and the right plastics, easily made.

[NAGG]

No Longer Available. Find someone with a 3D printer, you'd have contacts and the right plastics, easily made.

Thanks mate - I went from NFI but guessed that's what NLA meant ;D

I work for a company that - aside from plastics - sell high end 3D printers ...... incl metal 3D printing. So I'm sure the part can be scanned & made .

Chris

[NAGG]

I went & had a chat to the local Merc dealer about the Mercmonitor gauges ...... He wasn't 100% sure as it depended if the motor was set up for analogue or digital. needed to see it

This bloke I've used previously for boatcode / NSW registration & found him pretty trustworthy . .... I laid it on the line as I would need a local guy for services .... plus to do the rego transfer / boatcode.
Anyhow he ran over what I should be looking for when buying this motor ....... RPM , Oil , Gearbox oil - etc ..... even printed me out the specifications .

I asked him outright about the motor & reliability ......... He basically said that these were a pretty bullet proof motor & took me over to his own boat - which was running the same vintage (pe 2014) same block & had over 2000 hours on it . ( His other business was a boating school) . He showed me the Merc monitor gauge that was fitted to his own boat .

certainly a worthy 30 mins spent with the guy

Chris

[gunna]

What hull is it on? You buying that too ?

[gazza2006au]

I think this is what your looking for, i donno much about NMEA 2000 but you must have to use a Mercury gateway from the engine to the gauge or maybe thru NMEA than to the gauge i donno how it works

[NAGG]

What hull is it on? You buying that too ?

Hi Pete

480 hornet ..... the same hull as i had back in the mondy days

chris