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. Is this some great secret being held on to by Johnson Evinrude mechanics. Ok I am totaly new to this forum and totaly lost when it comes to finding a possible replacement to the VRO pump on my 2004 50 hp Jonhson. On the other hand, the brother-in-law's motors (3) have two different year's pumps on them. If you follow these recommendations, you will have a reliable and economical outboard that will keep your boating experiences pleasant. The oil pump is directly connected to the fuel pump piston (orange) and diaphragm so they work in tandem. The ratchet clamps (OMC P/N 322654) give the best seal and full 360-degree clamping action. Should I disable my VRO. Replace the VRO fuel pump with a simple fuel only pump.
The oil line should be OMC's 1/4-inch I. D. inner "rubber" hose (OMC P/N 333485) without any splices. 2 - Trace the two wires from the oil tank to the engine, disconnect those two wires, then remove them and the oil tank. This is also the reason to not disconnect the gas line and run the engine "dry". I've found countless sites online selling fuel pumps and I have many local marine stores in my area. Other suggestions: Johnson/Evinrude VRO Fuel Pump Conversion. Vro pump conversion to straight fuel pump blog. But another person said it will cause the fuel pump to fail, so I'm not sure what I should do. You can use a clear piece of fuel line connected to the VRO inlet and "T" off to a vacuum gauge. Part number 5004559 updates all early three-wire VRO's except those found on the two-cylinders. A long standing practice was to pre-mix the gasoline and oil together in the boat's fuel tank.
A "NO OIL FLOW" alarm system. This makes them more efficient, but also required a special fuel pump. I have a 1984 Evinrude GT150 and they disconnected the VRO but didn't put a fuel pump on it. When working on a fuel system, check for any restrictions or air leaks which would affect the engine.
"Yeah, my boat smokes like hell at low speeds and fouls the plugs, " bemoans one boater. 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. One beep every 20 to 40 seconds is a low oil level in the remote tank. VRO STORY—The Myth of the Mixer. Gasoline reformulation in those early years contained alcohols and solvents that softened the internal rubber components and caused pump failures and damaged engines. 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. Vro pump conversion to straight fuel pump compressor. OMC took care of the blown powerheads and improved the pumps considerably. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. Early systems had a smooth vinyl oil line that hardened after a few years and sometimes caused air leaks. 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). I've never had any issues with the VRO but should I disable the oil line from it before it causes me problems? "Come to think of it, " the third member of the group chimes in, "my brother-in-law's offshore rig with twin outboards must have a flaky VRO; one motor always uses more oil than the other.
The mechanic told him the VRO went bad. Directly connected to the air motor is the fuel pump and the oil pump. VRO to Pulse Pump on Johnson 115. One directs pressure cycles to one side of the air motor's piston (white chamber) and an inverted check valve directs the vacuum cycles to the opposite side (tan chamber). As the throttle opening increases, the stronger crankcase pulses cause greater piston travel resulting in longer oil pump strokes. 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. 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. As the throttle is advanced, the pressure pulse gets stronger because of the increased airflow through the crankcase.
Follow the pulse line from the VRO to the engine block and look for a hex shaped fitting threaded into the crankcase. How to Remove and Replace a Johnson or Evinrude VRO oil Pump with a Direct Fuel Pump. It's 2 stroke, I assume of course, carborated, and the model # appears to be 50plsoc. Each OMC (VRO) kit contains the parts needed including a new pulse limiter to install the system correctly. A decal is available (OMC P/N 335707) for the dashboard that illustrates the different warning signals and what they mean. VRO Oil Pump information. This is why YAMAHA had to run so many fuel pumps on there engines as they kept pulse type pumps. It should be a loud steady tone. 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.
They are recognized by the brown fuel outlet fitting and/or a wiring harness attached to the alarm module. Earlier versions of this article have appeared in BASS & WALLEYE and TRAILER BOATS magazines, the AM-Tech newsletter, and other online resouces. This aerated gasoline has less volume and less resistance causing the fuel pump diaphragm to cycle faster. OMC also makes a wiring harness adapter (P/N 174710) for the 1984 and 1985 engines that did not have any warning systems. So basicaly at this point, with the help of friends who know more, I want to switch out the VRO for a cheaper standard fuel pump. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. A fuel restriction such as from a bad anti-siphon valve, kinked line, or a partially plugged filter does not allow a full charge of gas to be drawn into the fuel pump cavity. VRO replacement and no fuel pressure fix. On 1996 and later engines with a SystemCheck® gauge, only the "hot" light will come on, but no horn unless the motor is running. 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. The correct way to do it is to discard the complete VRO-unit and install a standard fuel pump on the crankhouse. Vro pump conversion to straight fuel pump replacement. The later model VRO's pump more oil at low speeds than the original ones did.
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