1976 9.9 Issue?

[bigredmf]

I have a new to me 76 9.9

Been running it in a 15 Gallon bucket just to see how she runs.

Starts right up but shoots a wad of milky substance upon start up.

After a number of minutes the water in the bucket is quite nasty.

After a few hours the water looks more brown than anything with clumps of froth clinging together in brownish clumps.

When running on muffs there is white froth coming out of the exhaust discharge and the prop exhaust. It flings around on my driveway.

I have read that this may be normal. Is it?

It had the wrong plugs in it and was sitting for many years prior to my acquisition.

You might ask why I have been running it for hours? Well I was hoping to "flush her out" after many years of hibernation. In fact she smokes less and less the more I run her.

I have been monitoring temperature of the block and it takes a long time for it to become warm to the touch and once it does it cools down quickly so I am assuming the thermostat and water pump are working but am questioning the time (20 minutes) it takes to warm up. There actually is a large amount of water coming out of the leg by the shift rod which I understand is not ideal/correct and there also is what appears to be exhaust staining in that area.

Any of your thoughts are appreciated.

Thank you!

RED

 

[Barracuda Bill]

Re: 1976 9.9 Issue?

Sounds like gear lube in the water. I guess I'd check the lower unit oil. Also, probably pull the lower unit off to be sure the impeller is good, the water lines may not be seated correctly, thus the large amount of water out the leg.

 

[Daviet]

Re: 1976 9.9 Issue?

Are you running 50:1 gas/oil mix, if so put it in the water and run it.

 

[bigredmf]

Re: 1976 9.9 Issue?

I might be out of my mind but I am running 75:1 per the following link. I see Leroy is referenced here from time to time and he mentions they were designed for 100:1 but felt people would not necessarily use the right oil or proper ratio.

http://www.sschapterpsa.com/Ramblings/Johnson 9.9_15.htm

Am I out of my mind @ 75:1?

I changed the gear oil and it looked ok.

Does that much oil in the exhaust seem to be the norm?

I am heading to a pristine Adirondack lake and hate to pollute!

Thank you!

RED

 

[Rick.]

Re: 1976 9.9 Issue?

It was designed for 50:1 mix. I would not run any less or more for that matter. Leeroy knows these motors inside and out. Haven't read his work lately but I do remember him saying he has two tanks onboard. A 100/1 he uses when trolling and a 50/1 for faster speeds. I don't recall him saying 75/1 but I know his web pages are living documents and he changes them from time to time. I agree you should do your impeller right away before you go on your trip. Have you looked at your plugs. Is there any sign of water there? If not and you say the gear case oil was fine then I would not worry about the oil at the prop. Running in a barrel makes for a witches brew of oil/exhaust crud. It is concentrated but on the water it will dissipate as you move along. If your worried about water pollution then you need to get a four stroke. Or, my preferred solution is to run synthetic 2 stroke oil. I have been told synthetic oil will not pollute and is biodegradable. Best of luck. Rick.

 

[the machinist]

Re: 1976 9.9 Issue?

I have found that 75-1 mix but WITH semi-sythetic oil works OK for me. And I have moved away from the 2 tanks since I discovered semi-sythetic oil. I would not recommend regular TWC-3 however.

You misunderstood part of my article on what ratio the factory designed it for. They designed it for 50-1, but later changed it to 100-1, then found some owners abused their motors so they reverted back to 50-1. The oil at that time was not the higher grade TWC configuration we have now, much less semi-sythetic oil which is way better yet. Maybe I will have to go back & re-evaluate the wording on the website

Your 76 does not have a pee hole for a overboard water indicator & the exhaust water mixes internally with the exhaust gasses inside the exhaust housing. I think you are confining the exdhaust water in your 15 gallon bucket to the point that it is getting really contaminated in that then you are now recycling this "contaminated" water.

With you running it like you are, small bucket or muffs, you can not rev it up high enough to get it hot enough to burn any excess oil you are generating. If it had sat for a time, your oily exhaust is probably also loosening up some old internal oil.

If it is gear lube it will smell like rotten eggs.

I think what you are encountering is normal for the conditions & constraints you are putting the motor thru.

 

[bigredmf]

Re: 1976 9.9 Issue?

Thank you to everyone for your responses I do appreciate.

The machinist Your articles are a great find and I used them to add the pee hole. I understood what you were saying about the ratio but probably should have reworded my post.

These old JonnyRudes are awesome. I keep thinking I need to replace my 1971 85 HP but the more I run it the better it does.

Thank you!

RED