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If your Mfgr. says:
That motor's 7 years old!! Part is no longer available. We lose $$ on service! EPA made me do it! Part's at central warehouse, you'll get it next month. We don't make parts for those. We only do warranty work. Our techs only fix late models. No clue what's wrong! So we'll work time & material.
OPINIONS STATED HERE ARE THE RESULT
OF MY EXPERIENCES OVER THE LAST 30-SOME YEARS AS A MARINE DEALER AND
YOUR RESULTS MAY VARY.
BE ADVISED I ASSUME NO RESPONSIBILITY
WHATSOEVER FOR YOUR RESULTS FROM READING THIS INFO!!
Q: I use 87 octane in my car, why can't I use
it in my outboard?
This stuff's not fit to use in your lawn mower,
let alone a $12,000 high performance outboard motor. The low octane
and lack of detergent additives just leave you open to motor failures
from detonation, gum and carbon formation, coked up rings and piston
scuffing. Your automotive engine is a 4 stroke with totally different
lubrication and fuel usage requirements.
Q: Can I use oxygenated gasoline in my boat? A major oil company survey of the manufacturers
of engines for non-automotive uses -- boats, garden tools, chain
saws and snowmobiles -- indicates that oxygenated gasoline will
perform satisfactorily in most later-model engines. However, some
manufacturers expressed concerns about its use in older engines.
The owner's manual is the most authoritative source of information
about the fuel requirements of your equipment. If your equipment
is older and the manual does not mention oxygenated gasoline, consult
an authorized dealer.
Oxygenated gasoline will perform satisfactorily
in most engines under normal conditions of storage and use. However,
you should be aware of the potential problems -- two involving the
gasoline itself and several involving gasoline/equipment interactions.
Follow the suggested precautions if they apply to your situation.
Main Concerns are:
Gasoline oxygenated with alcohol readily takes
up water when it is present. The water may be condensed out of humid
air or be a contaminant in the fuel system. Dissolved water will
not interfere with engine operation. But if enough water is present,
gasoline oxygenated with alcohol will separate into two liquid phases:
a top phase which is almost all gasoline (and oil, in the case of
2-cycle fuel) and a bottom phase of water and alcohol. (Phase separation
is not a problem with gasoline oxygenated with MTBE.) Phase separation
may make the engine difficult or impossible to start. To solve the
problem, replace the separated mixture with fresh gasoline.
The situation with the greatest potential for
damage is phase separation in the fuel tank of a 2-cycle engine
without an oil sump. If the engine is able to start and run on the
alcohol/water phase, it won't be lubricated -- almost all the added
engine oil will be in the gasoline phase.
To minimize the chance of phase separation, keep
water out of your equipment's fuel system and practice good fuel
management. You can eliminate the possibility of water pickup when
your equipment is not in use if you keep the fuel tank full and
close the tank vent.
Deterioration During Storage
If a gasoline is of poor quality or if the storage conditions
are adverse, gasoline can oxidize and form gums over the period
of several months. These changes can increase engine deposits and
filter plugging. There are reasons to suspect that oxygenated gasoline
may form gums more readily than conventional gasoline, but actual
evidence is limited. A safeguard recommended by some manufacturers
is the use of name-brand gasoline from companies recognized for
the quality of their products. Another safeguard is good fuel management.
Compared to a conventional gasoline, oxygenated
gasoline results in a leaner air-fuel mixture. This causes some
engines to run rough. Also, engines may run hotter on lean mixtures,
which, in the extreme, can result in engine damage. If the engine
in your equipment is running rough and it has an adjustable carburetor,
check that the adjustment is proper for the fuel you are using.
Either contact a knowledgeable serviceman or follow the manufacturer's
instructions in your owner's manual.
Some manufacturers--Arctco, Bombardier, Outboard
Marine, and Polaris--indicate that certain of their engines may
require larger carburetor jets to compensate for the leaning effect
of oxygenated gasoline. Consult your authorized dealer or serviceman
about the manufacturer's recommendations for your engine model and
Deterioration of elastomers and plastic parts is not expected
to be a problem with current production engines. For older engines,
some problems have occurred with elastomeric parts (fuel pump diaphragms,
needle valve tips and seats, fuel lines, gaskets, etc.) when they
were first exposed to oxygenated gasoline. Some manufacturers recommend
that you frequently inspect the fuel system for leaks and for deteriorating
elastomeric parts when you operate an older engine on oxygenated
gasoline. There is also the possibility of leaks after you change
back to conventional gasoline: Seals that were swelled by oxygenated
gasoline may shrink. (The same mechanism is responsible for leaks
cause by large changes in the composition of conventional gasoline.)
Replacement fuel system parts have been engineered to be compatible
with oxygenated gasoline.
Some manufacturers report corrosion of metallic fuel system
parts when gasoline oxygenated with alcohol was used in older engines.
Except for periods of prolonged storage, this does not appear to
be a concern with late model engines. Corrosion problems may be
aggravated by the phase separation of a gasoline oxygenated with
alcohol. The alcohol/water phase tends to be more corrosive than
the oxygenated gasoline itself.
Oxygenated gasoline may loosen deposits from fuel
system surfaces because it is a better solvent than conventional
gasoline. The suspended solids can plug the fuel filter and carburetor
passages. This is not a common problem. It is most likely to occur
when older equipment is first fueled with an oxygenated gasoline.
Clean the fuel tank and fuel system and replace the fuel filter;
then refuel with fresh fuel.
Practice Good Fuel Management
Match your purchases to your consumption.
Don't buy more than you'll use
in one to two months.
Store gasoline in a tightly-closed
container in a cool, dry place.
Vapor Lock And Difficulty Restarting A Hot
"Vapor lock" is loss of power or engine shutdown
due to gasoline vaporization in the fuel system. Vaporization prevents
the fuel pump from delivering sufficient gasoline to the engine.
Factors favoring vapor lock are high ambient temperatures which
accompany high power output. Sometimes vaporization occurs after
the engine has been intentionally stopped because of the cessation
of mechanical cooling and fuel flow. In this case, the hot engine
will be difficult to start.
Vapor lock and hot restarting have been reoccurring
problems for engine manufacturers. Some manufacturers are concerned
that oxygenated gasoline will aggravate these problems because adding
either ethanol or MTBE to gasoline increases volatility.
The volatility of gasoline sold in each area of
the country is tailored for the expected ambient temperature range.
Buying smaller amounts of gasoline more frequently make it more
likely you will have a gasoline of the correct volatility.
Your owner's manual may suggest additional ways
to avoid vapor lock. Remember that some situations lead to vapor
lock more often than others. One is running an engine at full power
for an extended time on an unseasonably warm day. If vapor lock
does occur, it will probably be necessary to allow the engine to
cool before it can be restarted.
Q: What Octane gasoline should I use for my outboard?
I have an older outboard with higher compression. Should I burn PREMIUM
NO! Here's why: the octane ratings are composed
of 2 components, research octane and motor octane (RXM/2) divided
by 2. The RESEARCH octane is the quality of the base stock, the
MOTOR octane is derived from additives. The oil company will never
tell you the ratios. Problem is the highest octanes are achieved
by MOTOR octane additives, which will just gum up the pistons in
a 2 cycle engine. Base stock is generally the same. The MID-GRADE
gas has the detergent additives needed to clean your motor and sufficient
octane for MOST motors. If you have a MERCURY, FORCE or OMC motor
from the early 70's thru mid-80's refer to technical bulletins from
the manufacturers for timing changes and replacement head gaskets
to lower compression to use today's gasoline.
We pay the freight out in USA on all orders
over $100.00. Orders less than this amount will have a shipping
and handling charge of $8.75 added. Some bulky and heavy items
will incur additional charges. You will be notified beforehand
if this is the case. Remember, all orders receive free technical
support from the MasterTech!
The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. Changes are periodically added to the information herein. Mastertech may make improvements to this site at any time. Parts ordered from this website may or may not be in dealer stock at the time of order. Thank you for reading.