disconnecting oil injection on 98 mariner 200efi

[20vector]

hello all. craziest thing happened other day.2 weeks ago went out on boat for the day and all went well.when i got home no issues just parked in slip like i usually do and left.last weekend went down to take boat out of water.had truck and trailer in water at launch.started boat and instantly was get warning horn going off indicating oil issues.(beep beep beep etc.).so launch was only 75 feet away so continued on and put on trailer.warning horn going off the whole time. so today was off and checking it out. was thinking the oil tank on motor was going to be low and was going to purge air out like ive done before.purged air out and horn was still going off.so shut off and investigated.mine is a 98 model so has motion sensor on oil injection. noticed right away that clear oil hose was empty about the top inch of it. opened bleeder screw on oil pump and didnt help. So decided its a good time to disconnect oil injection since not working anyway.
Wanted to know if theres any special things i needed to do besides cap off all inlets and outlets? also know i gotta disconnect oil injection warning system. didnt know if any other things i needed to do? also wanted to know y'alls input on doing this or not? was wondering if it would be better for my motor if i just fixed oil injection system rather then just eliminating it. also on this motor is the oil ratio 50:1 like most others? thanks in advance for all the info! ted

 

[Rod1]

Re: disconnecting oil injection on 98 mariner 200efi

I have a 94 Merc 200, same thing happened. I'm guessing the plastic (nylon) gear that drives the oil pump self destructed. Seem to be a common problem for the Merc family. I converted mine to mixed gas, they sell a kit that has what you need, really simple. Runs fine, a little smokey at start up. I have an internal gas tank (100 gals.) so now I can run my trolling motor off the same tank.

 

[Prophammer]

Re: disconnecting oil injection on 98 mariner 200efi

I was going to do that on my 135 Johnson Ocean Pro, but with a 113 gallon tank; I always wanted to fill it up, but for some reason always couldn't, so I would never know how much oil to add (I always add 2 stroke oil to a gas tank first, to get it mixed good while filling) wrong thread for me to go into great detail, but I was thinking a smaller tank would work better for that.

 

[20vector]

Re: disconnecting oil injection on 98 mariner 200efi

yo " Rod1 " do you know what part number is for that kit? Crazy thing is that buddy has a i think its a 115hp mercury and after he removed his oil injection all he did was cap oil injection fittings. he just left the oil pump assembly alone besides removing arm that goes to throttle? anybody know why on his motor you can leave all that alone verses i hear on mine i have to buy a kit? what happens if i left all the oil pump system stuff alone as far as the pump stuff but capped oil itself so no more oil was flowing? any and all info is greatly appreciated!! thanks ted

 

[sschefer]

Re: disconnecting oil injection on 98 mariner 200efi

If the oil pump has failed then replace it. The oiling systems on these motors are highly dependable and a lot easier than mixing gas. In a high performance motor, remove it. In a fishing motor, keep it.

 

[20vector]

Re: disconnecting oil injection on 98 mariner 200efi

hello again. another quick question. mine is a 98 model and has the motion sensor. when motion sensor is making warning horn go off is that saying that the shaft that runs the pump is not moving or can the pump not moving make it go off. was just wondering if i have issues with the pump not working or if the nylon gear is damaged and done. was thinking id just have to replace nylon gear and bolt pump back on. all help is appreciated ive never done this before on a mercury.done alot of maintance and repairs before but not oil.

 

[Sprky]

Re: disconnecting oil injection on 98 mariner 200efi

The oiling systems on these motors are highly dependable

Drive gear failure for the 60* motors is not a matter of if, but a matter of when.

 

[20vector]

Re: disconnecting oil injection on 98 mariner 200efi

so if that nylon drive gear has failed and i want to fix it, the only way would be to split the case right? my buddys drive gear thats on crankshaft is metal and gear thats behind oil pump is nylon. seems by looking at the parts on web the shaft and gear behind oil pump on my motor is metal so does that mean the drive on crankshaft of my motor is nylon? heard theres a easier way to replace that gear without splitting case is that true? does anybody know how much those after market bolt on oil injection pumps are? and who sell them? just seeing all my options. thanks all ted

 

[jimg984]

Re: disconnecting oil injection on 98 mariner 200efi

sometimes the magnet comes off the float inside the oil tank cause a false low oil supply,,,,,, had that to happen on my 95 model......installed new tank and all is good.....this can be tested with a stiff wire bent a 90 dregee angle and lifting float assembly up while it is beeping

 

[sschefer]

Re: disconnecting oil injection on 98 mariner 200efi

I've torn down a few old motors and never had one with a failed drive gear. I've heard a lot of people say they fail but have seen little proof that they do unless there's another problem like excessive crankshaft end play, upper main failure or loss of cooling. Loss of cooling almost always takes out #2 first and guess where that gear is.

 

[Faztbullet]

Re: disconnecting oil injection on 98 mariner 200efi

.If your going to store the boat for extended periods I recommend you drain VST when using 50:1 premix....

 

[Faztbullet]

Re: disconnecting oil injection on 98 mariner 200efi

I have replaced probably 150 of these gears over the last 30+years. Most of the time failures were due to a overheat at sometime in engines lifetime. The newer nylon gears(2 piece) on the 1991 and up are quite more reliable than the old 1 piece gear. Order you the block off part #43453 and o-ring #25-32509. Remove the oil pump,bushing and shaft and install the block off(cut your screws off to 1/4 inch), plug oil line from upper oil tank to oil pump line, cap off pressure fitting on engine to oil tank in boat, disconnect purple wire from oil module and your ready to go. This will leave all the parts in place in case you ever what to repair it.

Crazy thing is that buddy has a i think its a 115hp mercury and after he removed his oil injection all he did was cap oil injection fittings. he just left the oil pump assembly alone besides removing arm that goes to throttle? anybody know why on his motor you can leave all that alone

Well that gear rarely fails on the L3-L4 model due to it being a bottom driven gear, thats one reason why the oil pump is not monitored. Also Merc does not offer a block off kit for that model but you can use a Sea-Doo block off plate that fits the 580-720cc motors(about $11)

 

[CharlieB]

Re: disconnecting oil injection on 98 mariner 200efi

when motion sensor is making warning horn go off is that saying that the shaft that runs the pump is not moving or can the pump not moving make it go off. was just wondering if i have issues with the pump not working or if the nylon gear is damaged and done.

How do you know that this sensor has caused the alarm? It could be any of; the sensor, the alarm module, a mis-fire on the ignition, or a pump failure. You have to check EACH ONE to determine the true cause for the alarm.

 

[sschefer]

Re: disconnecting oil injection on 98 mariner 200efi

How do you know that this sensor has caused the alarm? It could be any of; the sensor, the alarm module, a mis-fire on the ignition, or a pump failure. You have to check EACH ONE to determine the true cause for the alarm.

Absolutely correct. Obviously a quick check is to pull the pump and look at the condition of the gears but if you don't see anything wrong, then what do you do. You can look at the clear plastic tube and see a lack of oil but that is sometimes decieving. Testing the pump is done with a separate fuel tank with premix and then running the engine with the oil pump output line disconnected. Your run it into a graduated measuring device for a specific period of time and then from that measured amount, determine if the pump is working correctly.

The rotational alarm works in conjuction with the ignition system so, like Charlie say's, it could be the sensor or it could be a bad switch box. But since that is true, if the oil alarm is occuring without the engine running, the most common failure point is the float sensor in the upper tank. That doesn't eliminate the rotational sensor completely but it's more likely if your just winging it. Throwing parts at it is never a good solution nor is jumping to conclusions which is why Charlies recommendation is solid.

 

[20vector]

Re: disconnecting oil injection on 98 mariner 200efi

hello all. yeah alarm was only going off when motor was running. first thing i noticed was bout a inch of air in clear line. then hooked to portable test tank with oil premixed. first opened bleeder screw while running and no change. then while running again unhooked clear line going in vst and ran for a bit and never pumped any oil out of it. whole time was getting alarm. so knew oil injection was not working. pulled pump off and expected when i rotated motor that driven gear wasnt going to be moving. to my surprise it was moving. put little pressure on it and when rotated motor still moved. So guessing that since i know for sure it wasnt pumping oil that the problem had to be in the pump itself i guess? i thought the motion sensor was monitoring the driven shaft movement only? does it monitor the movement of the pump also? also when looking in hole where driven shaft goes looking at drive gear it appears to be in good shape, well what i can see of it. O YEAH yall learn me something, didnt know that a misfire on the ignition would make warning horn go off? does it go off intermitting like it does for oil issues? thought warning system was only for overheating, oil issues, and if fuel water separater was full of water? thanks again everybody for passing me some knowledge, seriously... ted

 

[20vector]

Re: disconnecting oil injection on 98 mariner 200efi

hello all just got finished disconnecting oil injection. checked all gears and all seem fine. pulled pump apart and everything looked good there except there was a spot when spinning pump would get little stiff. like i said when i first look at oil system there was a inch of the clear hose at the top next to pump on hose going to vst where there was no oil in it. initially i tried bleeding system and then took hose off going to vst and after running it a bit never got oil pumping. i just wanted to know why oil not working already disconnected it but want to know why. another thing after i disconnecting everything including warning module when i turn key on the warning horn still chirps to let know works. thought it wouldnt anymore after module was gone. thanks in advance ted