| Name: |
Pontoonfisher
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 7:34:49 AM
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While thinking more about this topic I had some other questions/thoughts. When you initial start a 2-stroke when it has been sitting for a while you have to prime the external fuel bulb. This allows fuel to enter the motor whitout oil being injected therefore when the motor first runs it is running fuel with no oil.
I am under the impression that this is ok b/c the gas has enough lubricating properties at idle speed. I have also read/heard that you can run a 2-stroke at idle with no oil without burning the motor up. You obviuosly would not want to do this on a regular basis.
So based on this if you prime the motor you should always give it some warm up time before you throw the hammer down on the engine. (Which is standard procedure for me)
Thoughts?????
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| Name: |
CAT BOAT
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 9:05:42 AM
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When you pump the prime bulb, you are simply filling up the carburator bowls with fuel. The Oil pump begans to feed the system as soon as the engine starts turning over with the starter. As far as running it at idle with no oil, I have no idea. But it does'nt sound very healthy to me. My .02 worth
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| Name: |
BoatsRFun
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 9:35:59 AM
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Man you guys got me scared to death, (Mavs post below $$) I've got a 2002 Mercury 150 (2 stroke) bought brand new and I put about 75-100 hrs a year on it, great motor, never had any issues with it. Cathouse Serviced regularly, should I do away with my oil injection Steve?? And Greycove had a good question, shouldn't a warning buzzer go off???
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| Name: |
CAT BOAT
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 9:39:43 AM
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Drake, I dont know what the magic answer is. Yea, the beeper/buzzer should go off if the tank is low, but what if a line comes loose or failes? I don't believe the buzzer would know such. I do know one thing though. If it fails and you don't know it it WILL ruin the engine.
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| Name: |
Pontoonfisher
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 10:11:52 AM
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You should be scared to death. Everytime I run this motor this is in the back of my mind. All it can take is one connection coming loose like CAT said and your screwed. The odds are in your favor that nothing will go wrong. I have known people that right after they purchased their new 2-stroke the first thing they did was disconnect the oil injection system and mix manually. It is something to think about. There is very little effort involved in pouring oil into your gas tank before you fuel up.
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| Name: |
Pontoonfisher
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 10:23:47 AM
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It depends on the buzzer deal. My alarm for my motor will only go off on over temp. and low oil. There is no oil pressure alarm. I would think that your motor should have the low oil pressure too b/c it is newer and a larger HP. Most people ignore these alarms or don't know what they mean. They beep at different frequencies or constantly to tell you what the alarm is.
My outboard has a constant sigal (high temp) and also a on/off signal (low oil). I had the on/off signal go off while we were out last year. I did not know really what it meant. I knew it had a high temp and some kind of oil alarm. I did not if the oil alarm was for low oil or low oil pressure. The motor was pumping water so I figured I had an oil issue. I dumped a 50:1 ratio of oil into the tank and went back to the dock. After I checked the manual I found out the alarm was for low oil but my tank was full. I just disconnected the low oil alarm switch and have had no more issues. Cat can confirm, but doubling up on the oil in an emergency situation should not hurt the motor. You will just have more smoke and could foul the plugs.
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| Name: |
Jim Dandy
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 10:44:16 AM
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Having burned up two oil injected jet ski engines over the past few years, I highly recommend converting to pre-mix. As others have noted, by the time you figure out you have a problem, its too late. Had one run out of oil and the warning light didn't come on. The other didn't have any warning system and the pump failed. Not worth the risk.
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| Name: |
CAT BOAT
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 12:38:58 PM
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Yep, Yep and Yep. I had one of the oil lines come off of my Yamaha 800. It promptly smoked that cylinder. Contrary to what I have suggested here, I did re-install the oiling system after rebuilding the engine. ONLY because the unit is for sale, and it's new owner can make his own mind up as to what he wants to do. The oiling systems on outboards and PWCs are very cheesey.
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| Name: |
houseboat
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 1:31:22 PM
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I was wondering if the parts, hoses, and etc. that operate the oil injection could be replaced at regular intervals like critical parts of an airplane engine.
In manufacturing, the posibility of down time can be reduced significantly by replacing items that wear on a regular basis. If you run it til it fails then it is too late.
I think most of us would rather take the risk instead of going to all that trouble and expense.
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| Name: |
Jim Dandy
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 3:17:55 PM
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A valid question, but what service interval would you propose for an oil injector pump? In the automotive world, that is typically a lifetime part. On my jet ski, it looked and operated fine until the day it decided not to work. No obvious reason for the failure. Probably no easy answer - except convert to premix.
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| Name: |
Osms
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 5:40:10 PM
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I'll share my experience. I bought a used boat with twin Mercury outboard 2 cycle motors (late 80's) that had oil injection. All was well for about a year, then while cruising one of the motors began to miss, then shutdown--took maybe ten to fifteen seconds. The problem was the oil pump is run off the crank shaft of the motor and the gear had shredded, consequently destroying the motor. By the time the temp alarm went off the motor was destroyed. Learned later that Mercury used a FIBER gear so that when it destroyed itself, it wouldn't throw metal parts throughout the motor--lots of good that did. Power heads are expensive.
My advice, and that of lots of experienced mechanics. When your warranty runs out, start pre-mixing.
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| Name: |
CAT BOAT
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 8:27:09 PM
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Oiling systems are Cheesy, period. Only a band-aid to move us to the next level.... 4 Stroke. Now you know the rest of the story. Sometimes we have to take a few steps back, open your eyes to see what is really going on. Face it, the Marine industry is somewhat behind, or was 15 years ago. Those with new engines are reading this and saying... ??? Huh???? I'm done for the day. Just got in for a nice ride in a couple of nice boats for test rides.
Bling it On.
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| Name: |
HP HQ
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| Subject: |
More questions on oil injection
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Date:
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7/12/2011 9:55:00 PM
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For what little its worth, my opinion is that the average guy was totally clueless as to how to mix fuel, so from a convenience standpoint, thus oil injection was invented. Then along came a devious little thing called a planned failure!! Sux when things go exactly as planned!
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