Mercury outboards are junk?

[wired247]

Re: Mercury outboards are junk?

You cant access the plastic gear unless you take the motor apart. Its the bronze gear you will be removing. It is the driven gear than runs off the plastic drive gear that is attached to the crankshaft.

 

[achris]

Re: Mercury outboards are junk?

The gear being referred to is around the crankshaft... Full strip to access. If you post the engine model, and serial number, I can look up the part and get the superseded number for you. (you've given us the year, but no idea of the horsepower :noidea

Chris.....

 

[Lino]

Re: Mercury outboards are junk?

The gear being referred to is around the crankshaft... Full strip to access. If you post the engine model, and serial number, I can look up the part and get the superseded number for you. (you've given us the year, but no idea of the horsepower :noidea

Chris.....

What I have is a 40HP Oil Injected, SN:OC233028
Looks like a big job to get this gear replaced.

 

[wired247]

Re: Mercury outboards are junk?

Well, you dont really need to get it replaced if you arent using it. It just doesnt get used is all.

 

[Faztbullet]

Re: Mercury outboards are junk?

Your motor is a 4 cylinder with composite 1 piece gear, the bottom mounted gears rarely fail unless engine is overheated. The ones in center of crank like on 2.4-2.5 motors are more prone and more likely to fail on engines before 1992....

 

[Lino]

Re: Mercury outboards are junk?

Your motor is a 4 cylinder with composite 1 piece gear, the bottom mounted gears rarely fail unless engine is overheated. The ones in center of crank like on 2.4-2.5 motors are more prone and more likely to fail on engines before 1992....

Thank you, this is good news for me.

 

[achris]

Re: Mercury outboards are junk?

What I have is a 40HP Oil Injected, SN:OC233028
Looks like a big job to get this gear replaced.

That engine is basically bomb-proof. Been around in one form or another since the 60s... You can't kill them with a stick! Also a very smooth running engine, and very easy to maintain... You'll have many years of good service from it.

Just keep up the usual things, annual service, water pump, clean fuel (make sure the fuel pump diaphragms are replaced EVERY year. The kit's only about $15, and it's all of 20 minutes work).

Good luck and have fun....

Chris......

 

[Lino]

Re: Mercury outboards are junk?

That engine is basically bomb-proof. Been around in one form or another since the 60s... You can't kill them with a stick! Also a very smooth running engine, and very easy to maintain... You'll have many years of good service from it.

Just keep up the usual things, annual service, water pump, clean fuel (make sure the fuel pump diaphragms are replaced EVERY year. The kit's only about $15, and it's all of 20 minutes work).

Good luck and have fun....

Chris......

Thanks Chris, I will definitely do these items.

 

[Hopkins]

Re: Mercury outboards are junk?

My motor is a 25hp seapro,1992 worked in hardest conditions of the coast of Iceland, what a splendid machine defiantly no Junk

Before you get upset, this is what I read, and hear from others how these outboards are junk.
I just bought this boat that came with a 93 oil injected 2 stroke Mercury outboard, and the last thing I want is to breakdown out in the ocean.
Why do people call these outboards junk, is there things that are continuously failing, did I end up with a lemon, or what I read is BS.

 

[sam am I]

Re: Mercury outboards are junk?

My motor is a 25hp seapro,1992 worked in hardest conditions of the coast of Iceland, what a splendid machine defiantly no Junk

Now that is a true testament if I ever read one........Sign me up Doc.

 

[Texasmark]

Re: Mercury outboards are junk?

The upgrade is removing the pump. Make sure that you get the Mercury blockoff kit though. Dont just remove the driven gear. Its only about $15 for the kit . It fills the volume in the case that the gear took up. Without it there it makes #2 cylinder a little lazy as the case volume is reduced a good bit for that cylinder.

Scuse me? The gear is 3/8ish in diameter and 1"ish long. It is below the combustion chambers. It marries to a phenolic (look it up not really plastic....phenolic is a resin and matting used as a gear to drive the cam shaft of the Ford 300 cu in six cylinder in line engine for one application, and was in production for a dozen or so years) mounted on the crank shaft. Industry used it for a multitude of applications. Had my pump shaft/gear out for going on 2 years and my little 90 on my tin lizzie (see avatar) still runs out at 50 gps on a cold day at 56-5800 rpm loving every bit of it.

Get your rumor straight!

Mark

 

[wired247]

Re: Mercury outboards are junk?

Scuse me? The gear is 3/8ish in diameter and 1"ish long. It is below the combustion chambers. It marries to a phenolic (look it up not really plastic....phenolic is a resin and matting used as a gear to drive the cam shaft of the Ford 300 cu in six cylinder in line engine for one application, and was in production for a dozen or so years) mounted on the crank shaft. Industry used it for a multitude of applications. Had my pump shaft/gear out for going on 2 years and my little 90 on my tin lizzie (see avatar) still runs out at 50 gps on a cold day at 56-5800 rpm loving every bit of it.

Get your rumor straight!

Mark

OK. I'll pull the "phenolic" gear off the 2.5 crank ( OK, mines black plastic ) I have sitting on the shelf and you can use it on your next build. It looks like a rat was chewing on it. They don't hold up well over 6000 and since many of them ...mine included... would run up to 7K I don't consider it much of a rumor.

 

[alanfox55]

Re: Mercury outboards are junk?

This is all interesting and curious sense I have a 1997 Mercury two stroke made in the USA not a Jap made Sea Pro. I'm thinking back on the three two stroke motorcycles I've had that also had oil injection. I never had a bit of problems with any of them and they were all ran hard. My road bike was a 1975 Kawasaki 500 H1 which had much more hp than stock. Never even thought I might have a problem with the oil injection and never heard of anyone else having a problem and these were high rev motors. Now I understand I am probably comparing apples to oranges but the comparisons are very interesting never the less. Here's a thought. To protect the motor against sudden oil injection failure run along with it a pre mix of 100 to 1 full syn oil. That would give you a total mix of about 37 to 1 would it not? Maybe I will start a new thread to get some opinions on that idea.

 

[Dukedog]

Re: Mercury outboards are junk?

protect the motor against sudden oil injection failure run along with it a pre mix of 100 to 1 full syn oil

Have heard of this with some of tha "salt" water guys on tha older motors. Don't see why it wouldn't work.

Always here that 6000 stuff but there are lotsa "production ProMax" motors out there still runnin' with 'em. Tha ones I know don't babie nothin'. Either idle or wfo anytime tha key is turned. Think that big assed flywheel would do more harm at tha bigger rpm than anything else.....jmo

 

[wired247]

Re: Mercury outboards are junk?

I think if you are doing 100:1 premix anyway why not just make it 50:1 and do away with the oil injection system entirely

 

[sam am I]

Re: Mercury outboards are junk?

Well I think its 49.5:1 at Idle'ish and 33:1 at WOT'ish

At idle'ish and with 100:1 pre-mix in the tank and a pump(oil metering device) that is set around this point/RPM such that for every 100 gals that flows by/through it, it dumps a 1 gal of oil in(100:1). So that means.....100 gals of pre-mix goes by (99 gal fuel, 1'ish(.99) gal oil = 100 gals of mix) the pump, it has added 1 additional gal of oil to the mix. So total flow consumed has to have been 101 gals mixed or 99 fuel, 2(1.99) oil, so 99:2 or 49.5:1

At WOT'ish with 100:1 pre-mix in the tank and pump(oil metering device) that is set around this point/RPM such that for every 50 gals that flows by/through it, it dumps 1 gal of oil in(50:1). or 100:2. So that means.....100 gals of pre-mix flows by (99 gal fuel, 1'ish(.99) gal oil = 100 gals of mix) the pump, it has added 2 additional gals of oil to the mix. So total flow consumed has to have been 102 gals mixed or 99 fuel, 3(2.99) oil, so 99:3 or 33:1

Seems, unless I'm wrong in my math(happens), the motor is running pretty dang rich, even richer than the guys that block off the pump and run 50:1 continuously .... which isn't good to begin w IMO, this is even worse......hmmmm.

Is running and mixing real oil with the synthetic analogous to taking Tylenol and Advil at the same time? "It's okay Doc, they're both diff drugs"?:numbness:

BTW.....didn't this thread die? Merc's are the BEST man!! This thread should have been vaporized

 

[wired247]

Re: Mercury outboards are junk?

More oil doesnt hurt anything . Less oil does. In any case more oil doesnt make it run rich. It makes it run lean. Not by much but as you replace oil with gasoline you lean the mixture. The oil burns but nowhere near as well as the gasoline.

 

[sam am I]

Re: Mercury outboards are junk?

Well there's that ole pesky Carbon, oil dipping out, sludge thing ya know? There is a balance, sure but, just where that is? I'm not too sure, I've never ran that rich, so I'm not one to make a definitive statement here but, seems 33:1 is pushing it, is it "just a bit more"? or is it "just a bit much?..

"In any case more oil doesnt make it run rich. It makes it run lean"? I guess I've always considered too much black, wet and sooty "rich", Dry and white is "lean"

In just air and fuel(no oil), too much fuel is "rich"(usually black carbony plugs as well though) and too much air is "lean"(white plugs).

Oil goes up, soot and carbon are building on plugs, exhaust etc and goes up, I say too "rich"

I could be wrong though, as I said, it happens

 

[phillyg]

Re: Mercury outboards are junk?

I read on the internet that I'm a french model.

I didn't have to read it on the internet; I already know I'm a French model. I have hair under my arms and on my legs.

 

[sam am I]

Re: Mercury outboards are junk?

I didn't have to read it on the internet; I already know I'm a French model. I have hair under my arms and on my legs.

This too shall pass