| Enginetype: Outboardgas > motormodel: johnson 200 horse
> Serialnumber: 91
> Configured: single
> boatmodel:
> Boatlocation: fresh
> typeofneed: (Other)
> Need_Other: vro system
> TechQuestion: I need some info on the
vro pump, how it works, what happens if one of the injectors is clogged, does it burn the
cylinder or just the bearings. Please send me some info on this thanks.
Our answer:
If the engine uses the "Variable Ratio
Oiling" (VRO) system, it doesn't actually have injectors as the phrase "oil
injection" might infer. Rather, it injects (mixes) the oil into the fuel, just before
the carburetors.
If the VRO system fails to mix the proper oil ratio then
serious piston damage will occur and/or possibly complete seizure.
This is why the warning system, that is part of this
design, should be tested and serviced on a regular basis. Also, the oil holding tank
should be inspected for water contamination. The warning system cannot tell if water has
contaminated the oil tank. Needless to say water isn't much of a lubricant.
The VRO pump, itself, is relatively dependable but again,
it should be tested periodically for proper function. The owners and service manuals
describe these simple tests that should be performed on an annual basis.
One of the most common problems is leaks in the fuel and
oil lines that causes this system to mix the wrong fuel/oil ratio. Hardened and/or the
wrong fuel line and fittings, pin holes and/or improper hose clamps used on the oil line,
etc.. Care needs to be used when replacing and/or servicing the lines to and from the VRO
pump.
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