Oil injection gear stripped, can I just pre mix?

[Savvy]

Hi there I'm hoping someone can help me out here.

This weekend I experienced the dreaded beep beep beep, after some troubleshooting I removed the oil outlet from the injection pump and no oil at all is coming out of this hose. I am assuming this means the plastic gear is stripped and I need to repair in the future.

My question is can I just pre-mix at 50:1 to get through the summer, without removing any of the oil injection components?

Or do I need to remove all the components, the shaft and stripped gear plug all holes etc.. before running pre-mix for the rest of the summer?

 

[Korbs67]

Re: Oil injection gear stripped, can I just pre mix?

I'm new to forums but I know its helpful to provide the year/make/model of the motor you have to get the most accurate responses from the veterans. Also, there is a lot of information on these forums regarding autoblending units vs. pre-mixing.

Most every opinion out there says disconnect autoblends and pre-mix in the tank at 50:1. In fact, my merc mechanic said mercury sent out a bulletin years ago to disconnect autoblend becuase it was a contributor to engine failures. Not sure the level of truth to that but most people arent taking any chances.

Also, if you dont disconnect the autoblend- mix the tank at 50:1 and if the autoblend does kick in it'll end up at roughly 25:1 to the motor which is a bit rich but not a problem. But just disconnect and be done with it.

 

[Savvy]

Re: Oil injection gear stripped, can I just pre mix?

Thanks Korbs, it is a 1994 Merc black max 135hp.

I have now taken the oil injection drive shaft out and the gear is definatley stripped. I have left the shaft out and cleaned as much of the plastic shavings out of the hole as possible, reinstalled the oil pump just so the hole is plugged. So it is now physically impossible for the autoblend to work.

Can I now run premix without any damage to the engine? I will fix with electric oil pump mod this winter but don't want to be down during summer fun time.

 

[Korbs67]

Re: Oil injection gear stripped, can I just pre mix?

I'm no pro to rely on that's for sure. My autoblend was a detached style unit from an '89 2 stroke 60hp. I just cant see any way that premixing 50:1 in the tank wont work.

With the arrangement you now have is fuel able to still flow normally? You bypassed the the autoblend completely with the fuel lines?

Like I say, premixing 50;1 even with autoblend wont hurt anything..it would just richen the mixture. I think you are fine but you may wait to see if a veteran guys chimes in. Or, poke around for an answer by calling a marine shop near you..they will usually "help a guy out" with quick free advice.

 

[oldman570]

Re: Oil injection gear stripped, can I just pre mix?

Yes you can disconnect the oil injuction pump and premix fuel. Just disconect the oil line going to the fuel pump and plug both sides of the cut line. Then keep oil in the oil tank or disconect the sender wire and insulate it from the tank. I myself would do away with the oil injuction and premix all the time. That way you know it is getting oil.
Oldman570

 

[Korbs67]

Re: Oil injection gear stripped, can I just pre mix?

Savvy- just do what oldman570 said. I knew someone would come along and offer up the more technical version of what I tried to say.

Good Luck and enjoy your summer!

Ken

 

[Chris1956]

Re: Oil injection gear stripped, can I just pre mix?

Savvy, I have a very similar motor ('93 Merc 135HPV6), and the pump shaft was removed, the pump reinstalled and the oil line looped to connect both inlet and outlet of the pump. It obviously runs on premix.

 

[Savvy]

Re: Oil injection gear stripped, can I just pre mix?

Thanks everyone, I will loop the lines to outlet/inlet and run her like that for the summer.

Now I can't get the alarm to stop.

When I disconnect the motion sensor it still alarms,I even disconnected both the float and motion sensor and it still alarms?

If I disconnect the alarm module it stops but now my alarm system will not be working.

What am I missing here, do I need to disconnect the battery to reset the system?

 

[Texasmark]

Re: Oil injection gear stripped, can I just pre mix?

I'm running my '02 3 cyl 90 like that now and the only difference is that coming out of the hole, on the first hole shot of the day, I have considerably more smoke as the auto mix put like an 80: 1 mix at low speeds and now you are running 50:1, but no biggie.....my engine had mental tremors the first hole shot anyway so this is no big deal. Once you get through the initial tremor, she just starts and runs like a kitten. Do it and quit worrying.

Mark

 

[reynold460]

Re: Oil injection gear stripped, can I just pre mix?

hi guys was wondering how you could go to premix on this motor as i think this is a 2+2 motor that runs on 100 to 1 ratio below 1800 rpm . wouldnt you be starving the 2 lower cylinders of oil on 50 to 1 ratio below 1800 rpm as they would be only getting half the oil they are designed to get below 1800 rpm i would do some serious investigating before going to premix on this outboard

 

[oldman570]

Re: Oil injection gear stripped, can I just pre mix?

The 50 to 1 mix is 50 gas and 1 oil making it more oil than a 100 to 1 mix. Most all 2 stroke motors will smoke moe at startup as they need the extra fuel at that time and will smoke less as the motor gets warmed up. The most that would happen is that the plugs will foul out if run at idel for a looong time. Steping the plugs up a heat range should solve the fouling plugs. As Texasmark states go for it and you will not have to worry about the oil pump going bad. You'll be happy you did later on.
Oldman570

 

[Korbs67]

Re: Oil injection gear stripped, can I just pre mix?

Oldman570 and Texasmark are exactly right. The ratio is parts of gas to oil. 50:1 is a richer mixture than 100:1 (leaner mixture). You are going to be fine. Let us know how your particular motor handles 50:1.
Korbs

 

[jigmister]

Re: Oil injection gear stripped, can I just pre mix?

Preform the repairs to the oil injection. Mercury has been building outboards longer than anyone on this site. They have done much research and testing over the years.
The oiling system is very reliable. Any mechanic that tell you otherwise is coving up weakness in their abilities.

You have 2 choices
1 throw away mercury factory parts and run rich. I do not need these parts (hack)
2 repair and tune outboard correctly. (professional)

the choice is yours

Just my 2 cents.