As for the constant sounding horn at high speed that stops when slowing down, that's a fuel restriction warning, not a VRO malfunction. The original VRO from 1984 and 1985 had a black fuel outlet fitting and no wiring. VRO Oil Pump information. But another person said it will cause the fuel pump to fail, so I'm not sure what I should do. So, contrary to boat ramp "urban legends", the VRO pump is a simple and reliable oiling system that has been standard equipment on most OMC outboards from 40- to 300-HP for the past 20 years. Be sure to read and understand the service manual before doing any of these procedures.
Since each carb receives the same oil to gas ratio, the VRO cannot cause only two cylinders to fail. Back then, no company had alarm systems for a pump failure or loss of oil flow. It consists of four basic sections: Cutaway View of VRO Pump Showing Major Components. Vro pump conversion to straight fuel pumpkins. As a result, some owners of OMC engines with the VRO feature have disconnected the pump and reverted to pre-mixing. Just make sure you have the pump installedon the crankhouse. If you follow these recommendations, you will have a reliable and economical outboard that will keep your boating experiences pleasant. Another service tip is to avoid Ty-raps or worm gear hose clamps on this system.
Actually, he only needs a refresher in the correct starting procedure. When working on a fuel system, check for any restrictions or air leaks which would affect the engine. Since 1993, the VRO is actually called an oil metering system (OMS). These pulses are routed through a pair of check valves above the engine crankcase pulse fitting. As the throttle opening increases, the stronger crankcase pulses cause greater piston travel resulting in longer oil pump strokes. The later model VRO's pump more oil at low speeds than the original ones did. Should I disable my VRO. Since the VRO depends on crankcase pulses to operate, it is susceptible to backfires from a lean running cylinder or an out of tune engine. In working with Sam with his older 210 equipped with a older VRO "Neverrude" that for the most part they were as strong as death... Changes included an electronic circuit to compare the oil pulses with the engine's RPM, a better oil pump piston, alcohol resistant seals, and a brown fuel outlet for recognition. Disconnect the fuel line at the engine. The operator just had to keep the oil reservoir full and oiling would be done automatically.
There is no mechanical maintenance that has to be performed on the pump itself, but the VRO system should be inspected occasionally for cracked lines, leaks, and broken clamps. This is also the reason to not disconnect the gas line and run the engine "dry". Vro pump conversion to straight fuel pump reviews. The latest P/N 5004558 pump is a universal fit that can be used as a replacement for all VRO equipped motors and each part is available for servicing. FIO Fuel Pump Conversion to Standard Fuel Pump. CDI Electronics' #551-34PV gearcase vacuum/pressure tester work well, as does a SnapOn YA-4000 or the old Stevens pumps.
Generate Transcript. Parts ordered from this website may or may not be in dealer stock at the time of order. The mechanic of the second guy's neighbor (2) did not understand that the VRO mixes the fuel and oil internally then delivers the mixture through the fuel lines to each of the carbs. The last guy (4) blames the VRO because he once had a car with a weak fuel pump and a replacement cured its hard starting problem. Vro pump conversion to straight fuel pulp fiction. The fuel pump, which is located in the middle chamber of the VRO, consists of a push-pull piston (orange) and diaphragm with a flapper valve and an inlet check valve. Pump the fuel primer bulb until fuel exits that hose with the tint of whatever oil you used.
Just like manually premixing the oil and gas, the VRO (OMS) automatically does the same thing and sends that fuel mixture to the carburetors. A rod connects the fuel pump piston (orange) directly to the air motor piston (dark green) and the two chambers are sealed from each other by an o-ring. But I just dropped a cylinder and now am trying to find a good used 150 or 175 for the boat before I sell it. Disconnecting the vro on a 1990 Johnson 115HP engine. To do this, turn the key on, motor not running, and use a jumper wire to ground the tan wire from the motor harness and listen for the warning horn. VRO to Pulse Pump on Johnson 115. Each cycle pulses oil into the foamy mix, increasing the oil:fuel ratio to the carbs creating a smoky exhaust. On 1996 and later engines with a SystemCheck® gauge, only the "hot" light will come on, but no horn unless the motor is running. If your motor is older than a 1993, make sure it has the blue colored pulse limiter to protect the air motor and the check valves in the pump. I've found countless sites online selling fuel pumps and I have many local marine stores in my area.
Surely some of them must have a pump that would work for me. If air gets into the fuel, it causes a foamy solution, similar to a head of beer in a tall glass. The fuel side of the pump recently went out. Check and test the boat's fuel system for restrictions and/or air leaks, and make sure the oil tank is clean. Of course a steady tone at all speeds is an overheat condition. I would like to replace the fuel pump with a regular pulse pump like I did on my 70hp. Actually, the much-maligned pump is very simple and reliable. This aerated gasoline has less volume and less resistance causing the fuel pump diaphragm to cycle faster. This required careful calculation and measurement of oil and gasoline, and particularly in large tanks could be awkward to accomplish. Each OMC (VRO) kit contains the parts needed including a new pulse limiter to install the system correctly. The mechanic told him the VRO went bad. In 1996, the SystemCheck® warning gauges were introduced. No problems for 4 yrs.
He didn't get an alarm or anything. The VRO's electronic circuitry compares the RPM of the engine to the number of pressure pulses from the oil pump piston. Mastertech may make improvements to this site at any time. This article discusses the history of OMC outboards with VRO, the theory of VRO operation, and the diagnosis and repair of common problems. The air motor diaphragm kit is part number 435921 and the fuel pump repair kit is 436095. A revised and updated version is presented here with the permission of the author, Bill Grannis, whom we thank for this valuable contribution to our REFERENCE section.
With the SystemCheck® equipped motors you will have to disconnect the OMS (VRO) four wire connector and carefully ground the tan motor harness wire lead to illuminate the "no oil" light. Can anyone confirm this? For more information on the SystemCheck upgrade kit, please see a separate article and discussion. Incorrect spark plugs occasionally cause false warning signals, too. I've heard a lot of people say yes, do it ASAP. I haven't done any of them (I bought the standard pump to do the job, but the motor was stolen before I got to replace it) so I cannot say first-hand what is correct or not. Now you have richer gas oil mix with its resulting symptoms. OMS pumps have a blue/gray outlet nipple or a blue/gray pulse nipple, or a black fitting held in place by an oval metal bracket and two Torx headed screws. Again, you get the full shot of oil mixing with less gas. I dont need this to fix to be "by the book", I need to get on the water and get use out of the boat and engine. If the engine revolutions exceed the preprogrammed oil pulse ratios, the warning horn is activated sounding a rapid on and off sequence. OMC introduced an oil/gasoline mixing system for their outboard motors in c. 1984, and called this feature a Variable-Ratio Oiling system or VRO.
On the return stroke, the oil pressurizes, exits directly into the fuel chamber (blue area), and is blended while enroute to the carbs. Most of the misinformation and "scare tactics" about its reliability originate from those who do not understand how the system works, or fail to keep it maintained. I have ruled out the fuel line from tank to outboard, replaced line and primer bulb, followed instructions posted on a threads here to disconect the oil side of the VRO, and am now mixing 50:1 in the gas tank. One of the bones OMC owners like to pick concerns the oiling system. Mastertech Presents: VRO PRE-MIX REPLACEMENT PUMPS. Other suggestions: Johnson/Evinrude VRO Fuel Pump Conversion. As the throttle is advanced, the pressure pulse gets stronger because of the increased airflow through the crankcase. The quickest and easiest test is the grounding of the tan overheat temp switch wire to the engine block. This is why YAMAHA had to run so many fuel pumps on there engines as they kept pulse type pumps.
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