Going to disable my oil pump. Where in the archives is the process?

[Texasmark]

Ok guys, you know who you are, having helped me and hundreds of others with problems. This guy (me) is still on the receiving end with my current fix my machine which is detailed in this sub forum and surely you have read.

After pulling my fuel pump and looking at the fuel/oil inlet plumbing and thinking about my potential initial outing problems (after I get this all back together and go to the lake), most every time I go out I have initial startup problems, and getting the pump back in and oil to the cylinders on the initial startup, and the fact that the engine is an '02 90 ELPT Merc, S/N OT 525,000ish, and the fact that I am not the "geez this mechanicing stuff is fun", I think I am ready to disable my oil pump and just add 50:1 oil to my fuel. My mind is made up, so please don't encourage me to leave the status-quo.

I can just pinch off the oil line at the junction with the fuel line at the entrance to the fuel pump and remove the oil reservoir from the engine. But I have no idea what effect that may have on components that may dry out, overheat, whatever the oil pump does with no oil supplied to it.

Come on guys, help me on this.

Thanks,

Mark

 

[SparkieBoat]

Re: Going to disable my oil pump. Where in the archives is the process?

I have done it mostly on older mercs and all models OMC motors..I have not done a newer merc..but I assume it would be the same..I bypass the connection where the oil is injected into the fuel line, (I am assuming that your newer model oil pump injects oil into the fuel line like the older ones.) then remove the tank, I am not sure how to handle the alarm issues on that model..maybe someone could chime in on that.

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

I have done it mostly on older mercs and all models OMC motors..I have not done a newer merc..but I assume it would be the same..I bypass the connection where the oil is injected into the fuel line, (I am assuming that your newer model oil pump injects oil into the fuel line like the older ones.) then remove the tank, I am not sure how to handle the alarm issues on that model..maybe someone could chime in on that.

First of all sir, thanks for answering.

On this engine, the output of the oil pump goes right into a Y, really more like a household sewer sanitary tee, where you have the main line and then here comes this aux line that drops the cargo into the main line. This connection proceeds the fuel pump. The fuel comes and goes out the main line and the aux (oil) line adds the oil to the fuel.

I can easily block this oil pump outlet. I can also block the oil pump inlet when I remove the oil tank from the engine. Question is, what happens to the pump with no fresh inlet oil, fire hazard, rip out the plastic drive gear? I have no Idea.

I can remove the oil pump and fabricate a flat plate to cover the hole where the pump was mounted. What do you think about that?

Thanks very much,

Mark

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

I think I am just going to remove the whole oil pump, measure the mounting flange, and fabricate a flat plate to block off the port. Then I won't have to worry about a thing. What do you think?

Mark

 

[justchecking]

Re: Going to disable my oil pump. Where in the archives is the process?

There are usually already parts for this:
http://www.crowleymarine.com/mercury-outboard/parts/3374_140.cfm parts 24,25,26 will run you about $10.
Not sure that's your engine, just an example.
Check here on iboats!
As well there is usually a plug available to plug the fuel pump or line.

 

[Faztbullet]

Re: Going to disable my oil pump. Where in the archives is the process?

Why do you want to do this as the bottom driven oil systems give very few problems, most problems are the V-6 (2.0-2.5L) as you rarely see or hear of a 3.0L or inline 3/4 cylinder looper chitting a gear or pump. If you do bypass remove the pump and shaft then cap it off.

 

[SparkieBoat]

Re: Going to disable my oil pump. Where in the archives is the process?

yes if you remove the pump..pull the shaft out also, then cap. you could fab a cap or order one from link above..your oil sensor wires go into a box, if it is like the older models, you would disconnect the ground going to this box to stop the oil alarm. You should test your over heat alarm when you are done and confirm that it still works properly.

 

[Big flop]

Re: Going to disable my oil pump. Where in the archives is the process?

Remove the pump, pull the drive gear
then remount the pump.
With the drive gear out it can't damage the pump
from running dry.

 

[oldman570]

Re: Going to disable my oil pump. Where in the archives is the process?

You could just cut the supply line from the oil res. and put a 'T" fitting in it, and run the hose going from the oil pump to the fuel pump back into the "T". Then block off the inlet of the fuel pump with a bolt and short pice of hose. This way you can replace the hoses if you ever deside to trade it off. You will not need to remove the tank just make sure there is oil in it and the oil pump wil reculuate the oil and the alarm will stay as it is.
If you still want to remove the pump, tank , and switch, there are plates, that might work for yours, for older motors or like you said make one. The wires for the tank just need to be disconeted and taped up going from the tank.
Oldman570

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

Ok guys. Great answers and I appreciate your time.

Will give it some serious thought.

Mark

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

Why do you want to do this as the bottom driven oil systems give very few problems, most problems are the V-6 (2.0-2.5L) as you rarely see or hear of a 3.0L or inline 3/4 cylinder looper chitting a gear or pump. If you do bypass remove the pump and shaft then cap it off.

Faz, I have the fuel pump out and was thinking about the oil getting back into the fuel initially when I put things back together. I thought about just shooting a little oil in the line before I connect the pump to ensure that I have oil on the initial startup.

But this brings up another question. My fuel usually drained back to the tank such that I had to pump the bulb 6-8 times to get it firm initially on the outing, after a month or so of sitting. Upon inspecting my fuel pump, I found that one of the check valves (translucent discs) was not flat. It had a crimp in it such that with the engine off it was not sealing. I don't know which one it was right now, but if it was the anti-siphon valve, then that could explain why I have to pump so much to get the bulb firm.

Anyhow, It appears to me that the only way oil will come out of the oil tube is for the engine to be turning over. When you pump up the bulb, the engine is not rotating hence you force raw gas up and into your carbs meaning that you get a "dry" start and don't get any lube till the oil pump starts adding oil and this mix makes it up to the carbs???????

Considering this is the case, this, and a potential failure are the reasons I want to disable the pump and just go with pre-mix.

Thanks for your time.

Mark

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

Well I dismembered it today. Some of the "sources of information....disinformation" on here were running their mouths about nylon gears on the oil pump......well so much for the DIF. My engine had a SS gear, highly machined and the whole mechanism was of the utmost quality......as it should be, beins this is what keeps your engine from disintegrating.

Filled my tank with 50:1 and ready to go. No more worrying about the oil pump failing, and no more dry starts when I have to pump the bulb half a dozen times to fill the carbs......with raw fuel. Course with what I saw today, I wouldn't have worried about it anyway, other than the raw fuel part which is very real.

So where is this mouth that blabbed this disinformation about nylon gears on Merc Oil pumps......hang the sucker!!!!!!!

Mark

 

[17rogue70]

Re: Going to disable my oil pump. Where in the archives is the process?

the nylon gear is inside the engine not the oil pump. atleast mine is . i just did the whole pump removal on a 1986 xr2 150 and couldnt be more happy with it now it is fool proof UNLESS someone doesnt put oil in the gas tank. but NOONE ELSE uses MY vessel NOT EVEN MY BOSS (WIFE) the steel shaft in mine came out after the pump.hopefully you used the plug kit to keep the brass bushing from falling into the engine , so it doesnt look like grenade went off later down the road.

 

[Faztbullet]

Re: Going to disable my oil pump. Where in the archives is the process?

Totally different design 17, does not need a plug as there is no bushing. Tmark the gear on your crankshaft is "plastic" and the oil pump shaft is steel,and for mixtures you can run that engine on 100:1 at a idle all day and not hurt it. There is enough old fuel in carbs and oil reside inside the engine to prevent what you think would cause a "raw" start. Change your plugs to a NGK BU8H if you start seeing low speed fouling.

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

the nylon gear is inside the engine not the oil pump. atleast mine is . i just did the whole pump removal on a 1986 xr2 150 and couldnt be more happy with it now it is fool proof UNLESS someone doesnt put oil in the gas tank. but NOONE ELSE uses MY vessel NOT EVEN MY BOSS (WIFE) the steel shaft in mine came out after the pump.hopefully you used the plug kit to keep the brass bushing from falling into the engine , so it doesnt look like grenade went off later down the road.

WOAH!!!!!!!!!!!!! No I didn't. Guess I have something to do today. Since I know how to R&R it now, it won't be that big of a deal to open her back up and take it out. Now that you mention it I remember seeing it in the IPB.

Thank you sir for that most important tidbit of information.

On not forgetting to add oil, I wrote in on the boat adjacent to the fill. That way if I forget, I deserve the consequences. Ha!

Mark

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

WOAH!!!!!!!!!!!!! No I didn't. Guess I have something to do today. Since I know how to R&R it now, it won't be that big of a deal to open her back up and take it out. Now that you mention it I remember seeing it in the IPB.

Thank you sir for that most important tidbit of information.

On not forgetting to add oil, I wrote in on the boat adjacent to the fill. That way if I forget, I deserve the consequences. Ha!

Mark

Well, it's done. Bushing was not a concern....it wasn't going anywhere, but I got it out. While in there, I took my light and inspection mirror and looked down in the hole to see the "plastic" gear on the crank. It wasn't white nylon as I surmised when I heard the word plastic. It appeared to be made of phenolic, a very rigid substance that is usually used, with some kind of binder (cotton,rayon,poly material) in multi layers for things like gears and other high stress jobs that choose not to use metal. When in industry we used it and I was overhauling a '91 Ford van with the 300 cu.in.6 and it was used for the camshaft driving gear.

Sooooooo any of you folks worrying about "plastic" gears driving your oil pump, if all are like my engine, forget it. This drive system will be there till the cows come home.

HTH,
Mark

 

[SparkieBoat]

Re: Going to disable my oil pump. Where in the archives is the process?

yea it is a fairly reliable drive system. but I just have more peace of mind when I premix. all it takes is a clog of pump fail to cause total devastation. I have always just left the pump in place..it is a good piece of info to know about that brass bushing..I did not know about it...great job..

 

[Faztbullet]

Re: Going to disable my oil pump. Where in the archives is the process?

The bushing you removed Tmark wouldn't fall out, the bushing 17 is talking about is in crankcase at the bottom of #1 cylinder. The plug kit is a long stem that holds bushing in in place in case of overheat as that when it falls out.

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

yea it is a fairly reliable drive system. but I just have more peace of mind when I premix. all it takes is a clog of pump fail to cause total devastation. I have always just left the pump in place..it is a good piece of info to know about that brass bushing..I did not know about it...great job..

All due respect sir, 17rogue70 put me onto in a couple of answers up the thread. He gets the credit. However, if all are like mine, I had to go through 3 punches to get one that I could affix against the side of the bushing and drive it out. On my engine, it would not have come out on it's own and for grins, I looked at the IPB and if it should happen to get loose, it would fall down to the bottom of the crankcase and in my opinion, do little other that rattle around, if that.

 

[Texasmark]

Re: Going to disable my oil pump. Where in the archives is the process?

The bushing you removed Tmark wouldn't fall out, the bushing 17 is talking about is in crankcase at the bottom of #1 cylinder. The plug kit is a long stem that holds bushing in in place in case of overheat as that when it falls out.

Oh, I thought it was the bushing that supported the end of the gear shaft that I removed, that contacts the gear on the crankshaft. In my IPB, I saw another at the upper end of the housing that the gear shaft is carried in and it shows a bushing near the pump. My shaft shows marks of something riding on the shaft at both ends. I.e. the shaft is 2+ inches long and is supported on both ends by bushings, but I didn't see the upper (near the pump) one and after what it took to get the other out, and since both show slits in them indicating that they are in compression when installed, it will be there forever.

Thanks again for this exchange. I really get a lot of lift exchanging with you guys. Sometimes I get a little short, but seems that happens to others as well. I apologize for that.

Tomorrow or Tuesday my pump parts will be in and in they go, out on the driveway for a test run, and as soon as the weather permits, my sweetie and I are headed to the fishing spot.

Mark