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Author Topic:   Oil:Gas Ratio
Ranger Rick posted 02-09-2004 07:31 PM ET (US)   Profile for Ranger Rick   Send Email to Ranger Rick  
Dumb question from first-time boat-owner alert:

I just got my '83 15CC and it didn't come with any manuals or other owner info and I was wondering how I can find out what the proper Oil:gas mix is. I've been "eyeballing" it per some advice from a guy at West Marine, but since I'm dealing with an '83 Evinrude 70 (antique motor, heh) I'd feel a lot better if I knew exactly how much oil I need to add, don't want to run too much (smoke) and REALLY don't want to run too little. Any advice would be greatly appreciated.


John O posted 02-09-2004 08:26 PM ET (US)     Profile for John O    

I am pretty sure it is 50/1

JBCornwell posted 02-09-2004 10:05 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Ahoy, Rick.

Yes. 50:1 All OMC engines made in 1964 and later use 50:1.

We JohnnyRude wrenches don't consider one old unless it was built before 1970. :)

Red sky at night. . .

Sal DiMercurio posted 02-09-2004 10:26 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Rick, do yourself & the engine a "HUGE" favor & decarb it with Engine Tuner.
All omc Bombardier dealers carry it.
Do this every 50 hours of running or you will be buying a new engine before you want to.
Just follow the directions on the can.
That engine will last you many more years if you change the water pump every 2 years & decarb it every 50 hours & change the lower unit grease the same time you decarb.
Even if the engine hasen't been run for 2 years, you have to change that water pump because the fingers on the empellor will set in a fixed position & wont supply enough water to keep her cool.
With even the slightest maintenance, those old 3 cylinder 70 hp engines are like the ever ready bunny, they just keep on runnin.
One of the very best engines ever built.
You might concider putting a temp guage & heat alarm on her, might save you an engine.
Ranger Rick posted 02-09-2004 11:46 PM ET (US)     Profile for Ranger Rick  Send Email to Ranger Rick     
Thanks for the great info guys!

Sal, do I understand you correctly by interpreting "decarb" to mean clean the carb, or run some kind of carb cleaner through the fuel system? By the lower unit lube, I'm assuming you mean changing the foot oil...If I'm wrong on any of this, please correct me. I'm new to the ownership of the boat, but grew up on a 13 Whaler, so I look forward to lots of new memories on my 15, made even better by the enlightened advice of the veterans on this forum. Again, thanks a ton.


PS-Any other maintenance tips are welcome and appreciated!

Sal DiMercurio posted 02-10-2004 12:26 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Rick, to decarbon an engine is to melt down the solid carbon that has built up behind the rings, on top of the pistons, the corners of the head or heads.
When carbon builds up behind the rings [ between the cylinder & rings ] the rings can't seat back into the grooves in the cylinders & normally causing them to break.
By decarbing the "inside" of the engine, basicly your putting the engine into the condition it came from the factory.
If rings can't seat & pistons can't go as far as they need to because carbon has tightened the tolorance between the top of the piston & the head,....."BANG".
Yes, the Engine Tuner is applied into the carburator or carburators & it will clean the carburator along with anything else it comes into contact with.
What it does is, melt the solid carbon so it's now a liquid & it gets burned & or pushed out the exhaust & cleans the inside of the engine & it's now free of obstructions.
Ranger Rick posted 02-10-2004 11:07 AM ET (US)     Profile for Ranger Rick  Send Email to Ranger Rick     
Is there a specific "engine tuner" product I should buy when I go to West marine this weekend? Also, any specific tips gleaned from experience I should know of for my first foray into the world of outboard mechanics? heh, thanks again Sal for the info, It's not even summer yet and I've got boat fever, can't WAIT to head out on the water.


jimh posted 02-10-2004 04:12 PM ET (US)     Profile for jimh  Send Email to jimh     
I'd start with adding some fuel additives to the gasoline tank. These are sold under OEM brands. When you add one of these the engine will typically smoke excessively for most of the tank. That is the built-up carbon being disolved and burned or exhausted.

My advice would be to go easy on an old engine that is still running OK, particularly if you are not a mechanic or experienced with using some of the more direct methods suggested here.

A little de-carbon-izer in the fuel tank will be a good start. I am sure OMC has a brand name for this. I think Mercury calls it QUICK-CLEAN.

When you use it, run the whole tank through before adding more gasoline, else you dilute the batch and reduce its effectiveness.

Many people use this treatment at regular intervals to maintain their engines.

Sal DiMercurio posted 02-10-2004 05:12 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Engine Tuner is only sold at an OMC Bombardier dealership, thats the name of it....Engine Tuner.
Merc carbon remover is called "Poer Tune", Yamaha is called "Ring Free".
You wont find any of these at West Marine, only an engine dealer.
Sal DiMercurio posted 02-10-2004 05:13 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Thats supposed to be..."Power Tune".

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