6 hp Johnson running low on oil

pecheux

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Good day, I have this old 6 hp Johnson OB at the cottage and the rig is being shared. I mostly keep the tank filled with a 50:1 mix. 4 days ago someone else used the boat and to be a nice guy filled the tank with gas ... but did not put in any oil. Originaly the tank was at a quarter ... he filled it to 3/4 the tank being a 20 gal I would guess he added 1.5 gallon of fresh gas to a 1 gallon premixed allready in the tank. Yesterday, not being aware I used the rig for approx 2.5 hours trolling most of the time .. with a short 1/4 mile WOT run. The motor still ran great at the end of the day. (then found out the flaw)

What is to be expected in terms of damage ? if any ?

Tx
 
kenmyfam

kenmyfam

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Aug 10, 2006
Messages
14,398
Re: 6 hp Johnson running low on oil

pecheux said:
Good day, I have this old 6 hp Johnson OB at the cottage and the rig is being shared. I mostly keep the tank filled with a 50:1 mix. 4 days ago someone else used the boat and to be a nice guy filled the tank with gas ... but did not put in any oil. Originaly the tank was at a quarter ... he filled it to 3/4 the tank being a 20 gal I would guess he added 1.5 gallon of fresh gas to a 1 gallon premixed allready in the tank. Yesterday, not being aware I used the rig for approx 2.5 hours trolling most of the time .. with a short 1/4 mile WOT run. The motor still ran great at the end of the day. (then found out the flaw)

What is to be expected in terms of damage ? if any ?

Tx
Click to expand...

I am assuming you mean a 20 litre tank ??
Good news is there was some oil in the mix and you mostly trolled.
Mix the remaining gas to the correct ratio and then
Do a compression check and see what results you get.
 
pecheux

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Re: 6 hp Johnson running low on oil

kenmyfam said:
I am assuming you mean a 20 litre tank ??
Good news is there was some oil in the mix and you mostly trolled.
Mix the remaining gas to the correct ratio and then
Do a compression check and see what results you get.
Click to expand...

Yes I meant 20 litres ... lol The guy who did the booboo is out there now adding the required quantity of oil to the tank. I told him to run the engine with the new mix in order to have enough oil on internal parts as the motor is permanently on the boat on a dock. As for taking compression I dont have a gauge. Would the fact that the motor pushes the 12 footer with the right power and speed be a sign that compression is ok ?

Tx
 
kenmyfam

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,398
Re: 6 hp Johnson running low on oil

It is a good sign but there is nothing quite like knowing the facts. It's only a small motor so why don't you take get a compression tester and check it next time at the cottage or take the motor home with you and find someone with a compression tester.
 
R

Rick.

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Joined
Jul 30, 2006
Messages
3,740
Re: 6 hp Johnson running low on oil

An once of prevention......don't want to sound preachy here but. I have a similar situation with a motor at the lake that several people could fill with fuel. I have clearly marked the mix rate on the tank and the motor so anyone adding fuel cannot be aware of the oil mix. After reading your thread I'm even happier I did it. Best of luck. They are tuff motors and I would bet your going to be fine. Agree the compression check is a good idea at this time. Rick.
 
pecheux

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Re: 6 hp Johnson running low on oil

Rick. said:
An once of prevention......don't want to sound preachy here but. I have a similar situation with a motor at the lake that several people could fill with fuel. I have clearly marked the mix rate on the tank and the motor so anyone adding fuel cannot be aware of the oil mix. After reading your thread I'm even happier I did it. Best of luck. They are tuff motors and I would bet your going to be fine. Agree the compression check is a good idea at this time. Rick.
Click to expand...

I will have the mixing instructions written on the gas tank with a felt pen asap. Tx
 
kenmyfam

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,398
Re: 6 hp Johnson running low on oil

pecheux said:
I will have the mixing instructions written on the gas tank with a felt pen asap. Tx
Click to expand...
May want to keep a jug of TCW-3 next to the tank as well.
 
M

mikesea

Lieutenant Commander
Joined
Oct 1, 2006
Messages
1,830
Re: 6 hp Johnson running low on oil

put your oil in there and hope for the best,I do know the smaller engines ,including the 9.9 and 15 came with 100-1 oil suggestions from factory on a sticker,so they can tolorate less oil,the fact you have no issues at present is good and I truly believe you dodged any disaster,Just add the oil now,I would add the pint to 6 gallons and forget about any over oiling at this point for that tank of gas.
 
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