Apr 13, 2009 · Re: 115 HP v4 VRO Johnson what is VRO? When the VRO pump first came out, it stood for variable ratio oiling. These pumps would vary the amount of oil from 100 to 1 at idle to 50 to 1 at full throttle. OMC eventually discontinued their production and switched to an OMS pump which pumps oil at 50 to 1 regardless of what rpm the engine runs.

Jan 15, 2010 · 1 - Cut and plug the oil line at the engine so that the oil side of the VRO pump will not draw air into its system. Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it. 2 - Trace the two wires from the oil tank to the engine, disconnect those two wires, then remove them and the oil tank.

Jun 19, 2002 · The system injects oil into the fuel BEFORE it gets to the carburetors.<br /><br />Have VRO systems failed-sure they have, so have water pumps and other components that can cause catastrophic failure.<br /><br />The VRO system typically is a hands off feature that most boat owners are unaware of the fact that the system does require maintenance ...

Jun 21, 2007 · boat has sat along time 3yrs.115hp johnson o/b is there a pump in the engine. that may need looking at since it sat so long. how does that oil get up to the engine. i know about priming with the bulb.got that figured out.im new at this system always used premix on …

Dec 17, 2010 · Re: VRO Pump Leaking Badly! Tom, you can purchase Bombardier part# 0438559 (std. fuel pump) . Utilize the VRO bracket by cutting and placing a small piece of aluminum roof flashing over the surface of the open area in the VRO bracket( where the VRO pump used to be) and mount that smaller pump to that flat surface (use small s/s bolts or …

Jun 2, 2020 · Hi I-boaters, Happy Summer for the USA folk! I recently decided to replace the diaphragm kit for my 98 150, 60 Looper. Even though the motor runs fine it was more prevention because I don't have genuine hours. Motor looks brand new but you never know internally. After reassembling the...

Jul 21, 2009 · Ran clear hose on output side of VRO and pressure tested. At 800 RPMs the pressure would gradually drop from 7 to 3.5 PSI within 15 to 18 second cycles. Each time pressure reached about 3.5 PSI, I noticed a very small group of bubbles (very small- probably combined would make one 1/16 in diam bubble) that pass out of the fuel outlet.

May 6, 2009 · Re: WARNING!!! To all VRO users I have a '98 115hp ' rude.seized up. 1st mechanic did not mention vro pump. 2nd mechanic said 1st thing is r&r vro pump. I do not know if he meant change it to a different pump, or just change it for another one. My rig does not have oil injection, mix it myself, but still has vro pump as I understand it.

Jan 28, 2002 · Re: Vro pump, how to check The VRO is both a fuel pump and an oil pump - it is operated by an air motor which uses a diaphragm and rectifier valves to convert crankcase pressure and vacuum pulses into motion for the pump's 2 chambers. The most common failure in a VRO is the air motor diaphragm, when it fails, the pump doesn't work - period.

Jun 4, 2007 · The signals from the VRO are: No oil - continuous short pulses; Low oil - short pulse every 20 seconds; Fuel restriction - constant horn at or near full throttle. The temperature switch in the cylinder head gives a constant horn at overheat, but that is at around 210 degrees when your engine is at serious risk.