| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1123.1 | It carbon build up and well known | HDECAD::DREW | | Thu Oct 28 1993 13:05 | 24 |
| The problem is a carbon build up on the cylinder wall and the pistons.
The rings stick and score the walls causing blow-by. The carbon also
acts as an insulator proventing proper cooling thereby causing
overheating which makes the problem worst.
The PM, which I do on my 1987 110HP Johnson, is to spray the engine
tuner into engine while its running at a fast idle (1100 RPM's) until
the can is empty. Wait for a hour or what ever the can says and then
take it out for a hard run for 15- 20 minutes. I've been told NOT to
let the engine set too long without burning out the engine tuner. I do
this every 50 hours of running time. I also use an additive to the gas
called "Carbon Guard" and use the highest octane gas I can get. The
Marina where I keep my boat did have Unleaded Plus and switched to
Unleaded Super half way through the season.
Johnson's new line of outboard motor oil has an additive in it to help
prevent the carbon build up. This came out this year. I'll probably
continue to use the engine tuner every 50 hrs along with the high
octane gas but will stop using the carbon guard. I'll keep some onboard
just in case I can't get the high octane gas.
"A little P.M. every 50hrs keeps the Coast Gaurd away"
Jim
|
| 1123.2 | howsa 'bout inboards? | GLDOA::DBOSAK | The Street Peddler | Thu Oct 28 1993 13:12 | 9 |
| So, does this stuff work with inboards? -- I'm running twin 454s and
am wondering if I should put this stuff in the carb during spring
commisioning?
Thanks,
Dennis
|
| 1123.3 | Maybe? | KAHALA::SUTER | Never too Hot! | Thu Oct 28 1993 13:17 | 5 |
|
As I undertand it the coking problem only exists in 2 stoke
motors... can anyone confirm or deny?
Rick
|
| 1123.4 | its true | MR3MI1::BORZUMATO | | Thu Oct 28 1993 14:03 | 8 |
| There is also another product called "ring free" except it is mixed
with the fuel when running. guess this coking is a real problem.
got this from a yamaha dealer.
m
|
| 1123.5 | yup | MR3MI1::BORZUMATO | | Thu Oct 28 1993 14:18 | 7 |
|
your right on only the 2 strokes, but i dont' know why.
look back in the notes archive, you'll find a long discussion
on this///// m
|
| 1123.6 | cleaning it up | SWAM2::OCONNELL_RA | wandering the west | Thu Oct 28 1993 17:24 | 4 |
| The problem is due to the oil mix. The older 2 strokes,(pre injection),
are worse. I have a 71 Johnson 125 and by using the tuner I was able to
cleanup the combustion chamber but not free the rings. Years of neglect
by unsuspecting previous owner.
|
| 1123.7 | synthetic | SNMFS::BOWMAN | | Thu Oct 28 1993 23:34 | 17 |
|
id try running a synthetic oil for a while
mercury make a synthetic 2 stroke racing oil also belray castrol and
shell.
i know from experience and talking to others who also run these oils
it lowers carbon deposits dramaticaly and also provides much greater
protection for general running.the flash point is also lower so it
burns off better.
the drawback of these oils is that they are expensive in comparison to
the normal oils.
over here im up for $15 per litre of belray but im sure its much
cheaper over there.
tks the other reg
|