Engine Tuner wouldn't

[omceed]

Last night after warming the motor up, I ran a can of Engine Tuner through my 200 '94 Ocean Runner and I could not get it to stall out the motor.I got maybe 2/3 of the can through and it just smoked like a Sherman tank, then the valve fitting that came on the can twisted off. This morning I did not notice any black residual out the exhaust.<br />Do I need to redo?<br />Also what is the run setting for the red choke lever at the valve fitting?( for run)-3oclock or 6oclock?<br />Thanks in advance!<br />Every hour you fish adds an hour to your life.

 

[BillP]

Re: Engine Tuner wouldn't

You can check by looking at the top of your pistons through the sparkplug holes. Piston crowns will look nearly brand new and even remove tarnish. This won't tell you if the rings were cleaned but is an indication that your decarbing proceedure was correct.<br /><br />Like a lot of cleaners, OMC Tuner has to be used on a warm engine or it doesn't do anything. I soaked a few parts in cold "tuner" for weeks and it did nothing.

 

[Solittle]

Re: Engine Tuner wouldn't

It is suggested that you use one can per carb to do the job. 2/3rds of a can just ain't enough.

 

[omceed]

Re: Engine Tuner wouldn't

Well today I ran the boat like I stole it upand down for 15 mins. I then came back and saw through one of the sparkplug holes that I still have black piston heads. the cylinder wall looked shiney.<br />Do I do another engine tune right away, until I see a clean shiney piston head?<br />Is there a limit where the engine tune will do harm if done back to back?

 

[Solittle]

Re: Engine Tuner wouldn't

You can't see the place that counts - the rings and the grooves in the pistons they ride in. That is where the harmful carbon builds up.

 

[BillP]

Re: Engine Tuner wouldn't

Like others have posted, buildup on the piston will cause hot spots and burn holes through the piston crown. I took apart a 1980 140hp omc and it had crud on all piston crowns about 1/16" - 1/8" thick and one piston had a hole in it. The ring grooves were clean in comparison except for the ones on the burned piston. The problem came from easy running without a thermostat for 1000+ hrs and no decarbing. That's when I got religious with decarbing and quit listening to mechanics who said it didn't hurt to run without tstats. I used to decarb 2 stoke mcy engines just on the piston crown. The rings didn't need it...but they were air air cooled engines too. I think (but am NOT a professional ob mechanic) the crowns are a good indicator of ring grooves.<br /><br />I fog each cyl one at a time through the carbs and not through the valve. If you try to fog 3-4 carbs at once it is hard to keep tuner in all cyls before shutting down. Fogging through the valve prevents this. When done right the piston crowns have zero buildup. In my experience, if you get any buildup inside of 200-300 hrs of runing something is out of norm anyway.

 

[DJ]

Re: Engine Tuner wouldn't

The key here is to run the tuner through a WARM engine.<br /><br />Also, the run position on your solonoid is 6 O'clock.

 

[omceed]

Re: Engine Tuner wouldn't

Thanks for the feedback! I am going to continue to run the Decarb through until I see a clean piston head.It doesn't sound like it will hurt anything,only help.I am using the OMC product. Does any other cut the carbon better?<br />I am also wondering if I should look at setting the mixture leaner. My 94 OMC 200 Oceanrunner Smokes like a sherman tank and thats got to contribute to the carbon buildup.<br />I know a two cycle is burning oil but I'm talking major smoke.

 

[DJ]

Re: Engine Tuner wouldn't

omceed,<br /><br />I do not thiunk you can set the mixtures, they are fixed. I wouldn't fool with them anyway.

 

[Cricket Too]

Re: Engine Tuner wouldn't

My 99 200's smoke like that also. I mean bad like you can't even breath when they first start up and you are standing behind the boat( Sherman tank is a good description). When I first got them I was a little worried and talked to one J/E mechanic that said the OMS pumps were maybe double oiling but I thought that was strange since they were both doing it and I doubt they would both do that at the same time. Another guy told me that this was normal for the carbed bigger blocks and it just might seem worse because there are two of them right next to each other. I checked the rate of oil consumption and it is not abnormal so I'm gonna just start using XD-25 or Ram oil and deal with it. Anyway when I went to decarb the piston heads were black as can be and it took a couple of decarbs until they came clean, not sure if it was ever done so that could have added. Good Luck.

 

[OBJ]

Re: Engine Tuner wouldn't

omceed.....as djohns posted....temp is everything. Make sure the engine is up to normal running temp and keep the rmps up slightly to keep it from stalling. Are you letting the engine set after an application as the instructions on the can specify? I believe it's up to 18 hours. As posted before, more than one application may be neccessary.<br /><br />Keep us posted.

 

[walleyehed]

Re: Engine Tuner wouldn't

My OMC manual says DO NOT allow engine tuner to soak more than one hour, and to repeat every 100hrs, or annually, whichever occurs first.

 

[crazy charlie]

Re: Engine Tuner wouldn't

Sounds like a job for seafoam.Get to a NAPA auto parts store right away and fork over the 6-8bucks and do the job right.Charlie

 

[OBJ]

Re: Engine Tuner wouldn't

I'm thinkin' tha' can says 18hrs soak time. But....having more than my share of "senior moments", I'll take another look at the can directions.

 

[Cricket Too]

Re: Engine Tuner wouldn't

crazy charlie....What is the correct procedure for Seafoam? Is it to run it through mixed with gas in a separate tank or are the directions just on the can?

 

[OBJ]

Re: Engine Tuner wouldn't

mmcpeck...I do believe it's a "shoot into the carb throat" application with a shorter soak time than Bomby's stuff.

 

[bob58]

Re: Engine Tuner wouldn't

SeaFoam Deep Creep is the shoot in the Carb spray can.<br />Sea Foam also comes in a regular can and can be mixed with the fuel in the tank and run that way as either a decarb process or additive to reduce deposits.

 

[Melvin Hatcher]

Re: Engine Tuner wouldn't

Ok, SeaFoam, OMC's tuner spray or whatever. Can we really expect to look through the spark plug hole and see a perfectly clean piston top?

 

[walleyehed]

Re: Engine Tuner wouldn't

OBJ, I'm lookin' at a shop manual...the Bomb can may be diff than the OMC tuner, so I'd go by what the can says... <br />D.G. I don't think you're going to make the piston tops look like "new" with the tuner....It'll remove alot of the carbon but not the discoloration....

 

[OBJ]

Re: Engine Tuner wouldn't

I gotta go down the shop for a few this morning walleyehed...I'll double check both cans...still think I got an old OMC can laying around. Now ya' got me concerned. <br /><br />It's is difficult sometimes to tell if the decarb is doing any good since one of the places you really need to see is difficult to see and that is around the rings. You can see portions of the rings if you want to go through the trouble but keeping tabs on compression from the git-go is problably the best indicator for decarb use. I also will watch the surface of my test tank for black carbon residue. Sometimes a lot if the engine hasn't had the best care and sometimes little.<br /><br />Bottom line, as been posted many times before, regular decarbing is a must.