Johnson - oil injection conversion???
 

I have a 1994 40hp Johnson which has the oil injection system on it. That
system has failed and I am now replacing the powerhead. When I put it back
together I would like to eliminate this oil injection system and go to a
"gas/oil mix". I understand that this is possible and that Johnson has even
published this conversion within there 1994 technical service manual.



Can anyone help me by providing me with this information? Is there any
website that might have it? Does anyone have a manual and would be kind
enough to copy the info and send it or email it to me.



Thanks in advance to all those who may be of help

Duane

Johnson - oil injection conversion???
 

If you're doing your own powerhead replacement, you outta buy the manual
anyway.

-W

"Duane Lee" wrote in message
...
I have a 1994 40hp Johnson which has the oil injection system on it. That
system has failed and I am now replacing the powerhead. When I put it
back
together I would like to eliminate this oil injection system and go to a
"gas/oil mix". I understand that this is possible and that Johnson has
even
published this conversion within there 1994 technical service manual.



Can anyone help me by providing me with this information? Is there any
website that might have it? Does anyone have a manual and would be kind
enough to copy the info and send it or email it to me.



Thanks in advance to all those who may be of help

Duane

Johnson - oil injection conversion???
 

"Duane Lee" wrote in message
...
I have a 1994 40hp Johnson which has the oil injection system on it. That
system has failed and I am now replacing the powerhead. When I put it back
together I would like to eliminate this oil injection system and go to a
"gas/oil mix". I understand that this is possible and that Johnson has
even published this conversion within there 1994 technical service manual.



Can anyone help me by providing me with this information? Is there any
website that might have it? Does anyone have a manual and would be kind
enough to copy the info and send it or email it to me.



If the "VRO" failed, there would be nothing left to use on your powerhead,
because even the cylinder scoring would be deeper than the .030" overbore
that the factory allows. The crankshaft would be trashed as would all the
bearings and races. The rods, wristpins, and needle bearings would have
melted together for lack of lube. Imagine what a motor would look like if
you normally premixed the fuel and one time forgot to add oil !!!!! It would
be an absolute mess internally, and froze up most likely.

If the above description does not completely describe your powerhead damage,
then it did not have a "VRO" failure. Read the following article link and
look at the colored cut-a-way of a "VRO" pump assembly to better understand
the system and the myths that the uneducated perpetuate about the "VRO".
http://continuouswave.com/whaler/reference/VRO.html

If you do want to eliminate the oil injection, you have 3 options. First you
can use the pump as a fuel pump only and block off the oil fitting and
disconnect the wiring from the "VRO" and the oil tank. Second, you can
purchase the fuel pump conversion kit that Johnson/Evinrude sells. It looks
like a "VRO" pump without the oil pump piston and housing and no electronic
warning system on the back of the casting.

Thirdly, you can talk to a sharp parts person or a savvy mechanic and have
them order you a 48hp fuel pump and all the related plumbing, hoses,
fittings, etc. needed to convert your motor.

Actually you do have a 4th option, and that is to find someone who knows the
motors and the "VRO" system and find out what actually happened to cause
your powerhead problem, then correct it.

Bill Grannis
service manager

Johnson - oil injection conversion???
 

If the "VRO" failed, there would be nothing left to use on your powerhead,
because even the cylinder scoring would be deeper than the .030" overbore
that the factory allows. The crankshaft would be trashed as would all the
bearings and races. The rods, wristpins, and needle bearings would have
melted together for lack of lube. Imagine what a motor would look like if
you normally premixed the fuel and one time forgot to add oil !!!!! It
would
be an absolute mess internally, and froze up most likely.

I call BULL****

I 've repaired *many* Mercury outboards that were designed for a 50/1
pre-mix - that somehow got put on a sudden wayward diet of straight
gasoline. Damage and results vary. This is probably dependant on operating
RPM and residual fuel mix left in the old tank.

Unless that is.. that OMC powerheads just don't have a chance under
stress...????

-W

Johnson - oil injection conversion???
 

"Clams Canino" wrote in message
ink.net...
If the "VRO" failed, there would be nothing left to use on your
powerhead,
because even the cylinder scoring would be deeper than the .030" overbore
that the factory allows. The crankshaft would be trashed as would all the
bearings and races. The rods, wristpins, and needle bearings would have
melted together for lack of lube. Imagine what a motor would look like if
you normally premixed the fuel and one time forgot to add oil !!!!! It
would
be an absolute mess internally, and froze up most likely.

I call BULL****

I 've repaired *many* Mercury outboards that were designed for a 50/1
pre-mix - that somehow got put on a sudden wayward diet of straight
gasoline. Damage and results vary. This is probably dependant on
operating
RPM and residual fuel mix left in the old tank.

Unless that is.. that OMC powerheads just don't have a chance under
stress...????

-W

I'd agree. Running wihout oil is not an instant catastrophic failure of
everything.

Johnson - oil injection conversion???
 

"Clams Canino" wrote in message
ink.net...


I 've repaired *many* Mercury outboards that were designed for a 50/1
pre-mix - that somehow got put on a sudden wayward diet of straight
gasoline. Damage and results vary. This is probably dependant on
operating
RPM and residual fuel mix left in the old tank.



Clams,

Your posts are normally knowledgeable and informative.

I can't comment on Merc ouboards run without oil, but on Johnson-Evinrudes
they will idle for hours with no oil in the gas. But when you accelerate
them and run at or close to full speed, the big-end rod bearings start to
smear which takes out the crankshaft and rods, plus the cylinders score
deeply and the wrist pins turn blue, as well as the main bearings. The
ball-bearing bottom main lasts the longest as all the fuel "drippings"
accumulate there.

Small motors will normally quit very quickly when things start to freeze up,
but higher hp engines will keep running longer as there is more power to
keep the damaged parts turning until catastrophic failure occurs. Computer
controlled motors are the same way, as the motor loses power, the computer
adds fuel and spark trying to keep the power up, thus bootstrapping the
damage.

The main point I was making for the "VRO" question was that ALL the
cylinders, pistons, and bearings would be damaged from lack of oil, not just
one.

Bill Grannis
service manager