By the way, the SystemCheck® can be adapted (with accessory kit P/N 176709) to any engine with a four-wire VRO pump. Should I disable my VRO. 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. 115hp Johnson VRO Fuel Pump Modification. Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it. You can use a clear piece of fuel line connected to the VRO inlet and "T" off to a vacuum gauge.
Johnson Vro Fuel Pump
It consists of four basic sections: Cutaway View of VRO Pump Showing Major Components. Also, pre-mixing set the gasoline-oil mix to a fixed ratio, typically 50:1. As for the constant sounding horn at high speed that stops when slowing down, that's a fuel restriction warning, not a VRO malfunction. Vro pump conversion to straight fuel pump model. Can I remove this vapor separator non-sense and plumb the fuel pump outlet straight to the carbs like an older motor? 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. Re: Should I disable my VRO? For those who pre-mix their fuel and oil, these kits allow the repair of the fuel pump section, avoiding the high cost of a new assembly or the re-plumbing and rigging of one or two traditional style fuel pumps. This back and forth motion of the air motor's piston (dark green) is what powers the fuel pump and the oil pump. This makes them more efficient, but also required a special fuel pump.
Vro Pump Conversion To Straight Fuel Pump Model
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. Do not interchange any of the springs with other pump assemblies. Mastertech Presents: VRO PRE-MIX REPLACEMENT PUMPS. Senior Refuge Member. The VRO2® was introduced in 1986 and included a "NO OIL FLOW" alarm. There are indicator LED's for HOT, NO OIL, LOW OIL, and CHECK ENGINE (which means a fuel restriction in a V-6 carbureted motor). Even though they are not listed in the parts catalogs, most of the diaphragms are interchangeable. It's 2 stroke, I assume of course, carborated, and the model # appears to be 50plsoc. The volume of liquid fuel is less and the oil delivered is the same as for a full chamber of fuel. FIO Fuel Pump Conversion to Standard Fuel Pump. VRO Oil Pump information. DISTINGUISHING VRO's. No matter what happened to a motor, someone would utter ".. be a bad VRO.
Vro Pump Conversion To Straight Fuel Pump Rebuild Kit
Earlier versions of this article have appeared in BASS & WALLEYE and TRAILER BOATS magazines, the AM-Tech newsletter, and other online resouces. Suggestions for updating older motors are included. As with the fuel pump, oil (yellow) is drawn in through the inlet fitting and a check valve as the air motor starts its travel. Mastertech may make improvements to this site at any time.
Vro Pump Conversion To Straight Fuel Pump Systems
I've heard a lot of people say yes, do it ASAP. Be sure to read and understand the service manual before doing any of these procedures. Since 1986 (and on updated 1984's and 1985's), the pumps have an alarm system that operates off the alternator or tachometer circuits. Vro pump conversion to straight fuel pump service. The operator just had to keep the oil reservoir full and oiling would be done automatically. 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.
Vro Pump Conversion To Straight Fuel Pump Service
OMC also makes a wiring harness adapter (P/N 174710) for the 1984 and 1985 engines that did not have any warning systems. As the throttle opening increases, the stronger crankcase pulses cause greater piston travel resulting in longer oil pump strokes. VRO to Pulse Pump on Johnson 115. "Uh huh, my neighbor had a blown engine, " quips another. Incorrect spark plugs occasionally cause false warning signals, too. The factory does not endorse spark plug manufacturer's conversion charts. The factory setup has fuel exiting the pump through a plastic elbow that slides into a smooth bore plastic piece with two o-rings to seal.
Vro Pump Conversion To Straight Fuel Pump Diagram
This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. Check and test the boat's fuel system for restrictions and/or air leaks, and make sure the oil tank is clean. Actually the engine works great when I become the fuel pump, but my hand gets tired and it's not allways easy to know where I'm going when I'm pumping the ball. This is why YAMAHA had to run so many fuel pumps on there engines as they kept pulse type pumps. "Took out two cylinders on his V-6. As the throttle is advanced, the pressure pulse gets stronger because of the increased airflow through the crankcase. It WILL lean out on the top end as loopers have very small crankcase pulses at higher RPM's. Vro pump conversion to straight fuel pump diagram. To simplify things just remember that the air motor converts the crankcase pulses to a back and forth motion. When working on a fuel system, check for any restrictions or air leaks which would affect the engine.
That means, more oil is delivered increasing the amount of lubricant in the fuel up to a 50:1 ratio. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. They are recognized by the brown fuel outlet fitting and/or a wiring harness attached to the alarm module. 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. The fuel side of the pump recently went out. If it has a black face on it, replace it with a blue style (OMC P/N 435009). Of all the traditional two stroke outboards produced worldwide, OMC products have the only automatic lubrication systems with a "no oil flow" alarm. On V-6's a constant horn at high speeds that disappears instantly when the throttle is pulled back indicates a fuel restriction. Need up to 30 seconds to load. Generate Transcript. The pressure (white area) on one side of the piston rushes into the vacuum side (tan area) as the large spring quickly pushes the piston back to its starting point. "Yeah, my boat smokes like hell at low speeds and fouls the plugs, " bemoans one boater. 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. Over the years some engine failures caused by lack of proper lubrication have been mistakenly attributed to defective VRO components.
I've never had any issues with the VRO but should I disable the oil line from it before it causes me problems? Audio volume control bar. Two-stroke outboard motors have traditionally used a mixture of gasoline and lubricating oil as their fuel. No problems for 4 yrs. 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. 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. It should be a loud steady tone. 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. 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. This required careful calculation and measurement of oil and gasoline, and particularly in large tanks could be awkward to accomplish. VRO STORY—The Myth of the Mixer.
As the back and forth motion is generated in the air motor, the double-action fuel pump's piston (orange) and diaphragm is pushed and pulled by the rod cycling fuel to the carburetors. These air leaks can also trigger "NO OIL" alarms, commonly at startup, idle, and trolling speeds. Water pumps through the system as easily as oil, so several time a year use a turkey baster to draw off some fluid from the base of the tank and squirt it into a clean jar. 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. Just make sure you have the pump installedon the crankhouse. You can also replace the clear plastic cap with the later model's solid black filler cap (OMC P/N 176217) that provides much better water intrusion resistance. In my case this wonderfull VRO that everyone raves about, and seems to run for the very low price off about $400. 5 to to 3-inches of vacuum at full speed.
Late-model OMC's use a double-wire wound spring clamp (#339277) that also works well in keeping lines air tight. A decal is available (OMC P/N 335707) for the dashboard that illustrates the different warning signals and what they mean. Part number 5004559 updates all early three-wire VRO's except those found on the two-cylinders. VRO replacement and no fuel pressure fix. Occasional checks should be performed to make sure the charging system, warning horn, and related parts are operational. 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. Air leaks and/or fuel restrictions will affect the VRO and usually show up as excessive oil consumption, smoking, and fouling plugs. If you follow these recommendations, you will have a reliable and economical outboard that will keep your boating experiences pleasant. Public perception fed by uneducated mechanics put the blame for almost every engine problem on the VRO.
The air motor diaphragm kit is part number 435921 and the fuel pump repair kit is 436095. A vapor lock situation does the same thing).
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