Merc v6 help ODDD1, JB Cromwell or anyone

[avidda]

I posted previously about my 1995 Merc 200 EFI and the oil injection system warning buzzer going off. Well, I took it to my mechanic and he did compression tests on all 6 cyl and got 125 psi across the board. So probably no major engine damage. I need some opinions on deleting the oil inj. sys on an EFI motor. Can this be done and what effect does it have on perfomance on this model engine. I have heard that the EFI models don't tolerate oil inj deletion well. Any opinions appreciated

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Ahoy, Avidda. I'm no Mercspert, but I have a couple of comments.<br /><br />A Direct Injected (DFI) 2 stroke is a different animal than the traditional 2 stroke. The oil is injected into the crankcase and is circulated with the charge air. The fuel is injected directly into the cylinder. PREMIX IS NOT AN OPTION!!<br /><br />It is too bad that the industry hasn't settled on consistent terminology. EFI/DFI/Optimax/V-Max/FICHT/Etc. are all Direct Fuel Injection (DFI) systems.<br /><br />Good Luck.<br />Red sky at night. . . . <br />JB

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Ahoy, Avidda. I'm no Mercspert, but I have a couple of comments.<br /><br />A Direct Injected (DFI) 2 stroke is a different animal than the traditional 2 stroke. The oil is injected into the crankcase and is circulated with the charge air. The fuel is injected directly into the cylinder. PREMIX IS NOT AN OPTION!!<br /><br />It is too bad that the industry hasn't settled on consistent terminology. EFI/DFI/Optimax/V-Max/FICHT/Etc. are all Direct Fuel Injection (DFI) systems.<br /><br />Good Luck.<br />Red sky at night. . . . <br />JB

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Sorry 'bout that. AOL is not responding reliably today.<br /><br />JB

 

[kev_79]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Not to undercut JB because he seems to be the man to ask around here, and please correct me if I am wrong, but I think that the Mercury EFI is just an electronic fi, not a direct injection. The optimax is merc's direct injection model. I am not an advocate of premix on merc's unless you are going to race it, but if I am right, then premix is an option. On the other hand, if I am wrong, then definately not. On a DI unit, the fuel is sprayed directly into the cylinder, and doesn't cycle through the crankcase. If you were to premix one of these, all you would have left is a 400lbs paper weight

 

[ODDD1]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Avidda, there is almost no difference to the motor between premixing an injection.....it is on your motor as a convenience to you ONLY!! Unless of course you forget just once when gassing up the boat...then it hurts both of you!<br /> the motor will troll better for long periods with oil injection, otherwise it is just convenience..<br /> have your tech do a oil pump output test to see if you actually failed a oil gear....it very well could be a sensor prob....<br />kev yer right DI motors changing things is NOT an option...

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Hmmmm. Obviously I am not a Mercspert. Are you guys saying that merc EFI is not really fuel injection? If it is, where is the fuel injected, where is the oil injected and what happens if you put both fuel and oil together? If it uses low pressure injectors to put fuel into the crankcase and other, low pressure injectors to put oil into the crankcase it seems excessively complex. That somehow doesn't sound like Merc. Low pressure injectors are usually sensitive to viscosity and may be clogged by a premix if they were designed for fuel only.<br /><br />Red sky at night. . . <br />JB

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Well, as I said I am no Mercspert. If Merc's EFI uses low pressure injectors to put fuel into the crankcase, and other low pressure injectors to put oil into the same place it seems really unneccessarily complex. Injectors designed to handle fuel only might not like mix, even at 50:1.<br /><br />Good luck.<br /><br />Red sky at night. . . <br />JB

 

[kev_79]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

I don't know about all of that low pressure, fuel, oil injectors on the EFI. I can't validate, but a merc dealer would be able to. It is fuel injection, and I was under the impression that it was similar to a throttle body injector on a early model car motor. The only low pressure injectors that shoot only oil or gas into the crankcase I have heard of are on DI units, and yes is very complex. I would check with your wrench to be sure

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

This is really getting frustrating. I read this thread three times after I posted my first reply and it WASN'T there!! Now I rewrite it and post it and the first one shows up. Are we having a problem today??<br /><br />JB

 

[clanton]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

EFI is like port injection on automotible, injects into intake port. I have Merc service manual for V6 EFI, it shows oil injection same as carbuator model, but does not show how oil in injected into the EFI engine. The oil is injected into fuel line ahead of fuel pump in carbuator model.

 

[avidda]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Thanks for all the responses. My wrench is doing diagnostics now. He said he was going to check everything out and let me know what failed. If the oil injection gear (the disk looking gear on the crank) has failed, what should I expect in repair costs. I understand that the motor will have to be dissassembled to make repair. Further, should I just punt and delete the system?<br /><br />thanks,<br />dave

 

[corm]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

I should be sking again.<br />If the gear is bad, you lift the powerhead,<br />pull the crank end cap pull the bearing,pull the gear. Put new gear in put bearing on, put end cap on, bolt powerhead on. Go for a ride. This gear doesn't go bad. The sys is very good. Course you could be unlucky.<br />...corm...(having fun)<br />BTW, I'm not going to explain the difference<br />between DFI & EFI.

 

[hondon]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Oil is injected into the fuel just before it enters the vapor separator which is about the same as a float bowl on a traditional carb model.Has a float and needle and seat and these two components can leak leading to what might be percieved as over oiling.

 

[walker4]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Do you know what might cause fuel to leak from the vapor separator ? It is like the float is not stopping the fuel and it continues to rise and release thru the vapor tube. I've tried two different assy's and it appears the floats are working. I'm baffeled. Any sugesstions?

 

[JB]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

You are waaaay off base here, Walker.

You have hijacked an 8 year old thread with a question that has nothing to do with the original topic. Very rude.

Make your own thread.

 

[walker4]

Re: Merc v6 help ODDD1, JB Cromwell or anyone

Sorry, I'm new to this. I've posted a couple times with no responses. It was the only post I could find talking about a vapor separator and the gentleman seemed to know what he was talking about.