Johnson 15 oil leak?

All things outboard related here!
4 Stroke, 2 Stroke & Electric
Post Reply
KevW
Active Member
Posts: 76
Joined: 21 Oct 2016, 11:51
Boat Make: Honwave t38
Outboard: Johnson 15hp smoker
MMSI Number: 10
Location: Gillingham, Dorset
Has thanked: 3 times
Been thanked: 23 times

Johnson 15 oil leak?

Post by KevW » 15 Jul 2018, 16:32

Evening
Just discovered a thick black sticky oil has run out of the water outlet hole at the bottom of the leg on my 2005 Johnson overnight.
Doesn't look like gearbox oil and has as slight smell of petrol to it.
Any ideas?

chris moody
Supporting Member
Posts: 1731
Joined: 24 Mar 2015, 12:19
Boat Make: Ribcraft 4.8 Takacat 3.4
Outboard: Honda BF50 Tohatsu 9.8 2s
MMSI Number: 235900806
Location: Braunston & Porchester
Has thanked: 57 times
Been thanked: 211 times
Contact:

Re: Johnson 15 oil leak?

Post by chris moody » 16 Jul 2018, 07:36

Is it a 2 stroke or a 4 stroke? Has it been stored upright or on it's side?
Chris Moody
Tigga 2: Ribcraft 4.8 Honda BF50
Taka Tigga: Takacat 3.4 Tohatsu 9.8

KevW
Active Member
Posts: 76
Joined: 21 Oct 2016, 11:51
Boat Make: Honwave t38
Outboard: Johnson 15hp smoker
MMSI Number: 10
Location: Gillingham, Dorset
Has thanked: 3 times
Been thanked: 23 times

Re: Johnson 15 oil leak?

Post by KevW » 16 Jul 2018, 08:35

chris moody wrote:
16 Jul 2018, 07:36
Is it a 2 stroke or a 4 stroke? Has it been stored upright or on it's side?
Hi Chris

2 stroke. Transported as normal then stored upright as it always is and never seen this before.

User avatar
Andy B
Supporting Member
Posts: 1725
Joined: 03 Sep 2015, 17:10
Boat Make: Zodiac 380
Outboard: Mariner 9.9hp/Mariner 3.3hp
Location: New forest, Hampshire
Has thanked: 73 times
Been thanked: 230 times

Re: Johnson 15 oil leak?

Post by Andy B » 16 Jul 2018, 09:15

Have you recently spent a lot of time at tickover?
Probably just 2 stoke oil.
SOLENT
Waveline 2.3m/3.3hp Mariner
Zodiac 380/ Depends on the Day!

chris moody
Supporting Member
Posts: 1731
Joined: 24 Mar 2015, 12:19
Boat Make: Ribcraft 4.8 Takacat 3.4
Outboard: Honda BF50 Tohatsu 9.8 2s
MMSI Number: 235900806
Location: Braunston & Porchester
Has thanked: 57 times
Been thanked: 211 times
Contact:

Re: Johnson 15 oil leak?

Post by chris moody » 16 Jul 2018, 09:29

I'd check your gearbox oil level just to be sure, and if that's ok, as Andy says, it can only be one thing unburnt 2 stroke oil. As it smells of petrol that's another pointer to it being 2 stroke oil.

What ratio of 2 stroke oil / fuel are you using?
Chris Moody
Tigga 2: Ribcraft 4.8 Honda BF50
Taka Tigga: Takacat 3.4 Tohatsu 9.8

KevW
Active Member
Posts: 76
Joined: 21 Oct 2016, 11:51
Boat Make: Honwave t38
Outboard: Johnson 15hp smoker
MMSI Number: 10
Location: Gillingham, Dorset
Has thanked: 3 times
Been thanked: 23 times

Re: Johnson 15 oil leak?

Post by KevW » 16 Jul 2018, 17:57

Only really spent time on tick over while flushing. I'll check the gearbox oil.
I run it on a 50 to 1 mix.

Thanks

chris moody
Supporting Member
Posts: 1731
Joined: 24 Mar 2015, 12:19
Boat Make: Ribcraft 4.8 Takacat 3.4
Outboard: Honda BF50 Tohatsu 9.8 2s
MMSI Number: 235900806
Location: Braunston & Porchester
Has thanked: 57 times
Been thanked: 211 times
Contact:

Re: Johnson 15 oil leak?

Post by chris moody » 16 Jul 2018, 20:59

As long as the gearbox only takes a small amount of oil in the bottom hole, before it flows out the top hole, and the gearbox oil isn’t milky, everything is good.

50:1 is fine.
Chris Moody
Tigga 2: Ribcraft 4.8 Honda BF50
Taka Tigga: Takacat 3.4 Tohatsu 9.8

KevW
Active Member
Posts: 76
Joined: 21 Oct 2016, 11:51
Boat Make: Honwave t38
Outboard: Johnson 15hp smoker
MMSI Number: 10
Location: Gillingham, Dorset
Has thanked: 3 times
Been thanked: 23 times

Re: Johnson 15 oil leak?

Post by KevW » 16 Jul 2018, 21:14

chris moody wrote:
16 Jul 2018, 20:59
As long as the gearbox only takes a small amount of oil in the bottom hole, before it flows out the top hole, and the gearbox oil isn’t milky, everything is good.

50:1 is fine.
Thanks Chris, I'll check at the weekend.

chris moody
Supporting Member
Posts: 1731
Joined: 24 Mar 2015, 12:19
Boat Make: Ribcraft 4.8 Takacat 3.4
Outboard: Honda BF50 Tohatsu 9.8 2s
MMSI Number: 235900806
Location: Braunston & Porchester
Has thanked: 57 times
Been thanked: 211 times
Contact:

Re: Johnson 15 oil leak?

Post by chris moody » 16 Jul 2018, 21:26

I’d be very surprised if it is gearbox oil, but better safe than sorry for the sake of half an hour and a bottle of gearbox oil. That reminds me, my Tohatsu is due a gearbox oil change as its now done 20 hours.
Chris Moody
Tigga 2: Ribcraft 4.8 Honda BF50
Taka Tigga: Takacat 3.4 Tohatsu 9.8

KevW
Active Member
Posts: 76
Joined: 21 Oct 2016, 11:51
Boat Make: Honwave t38
Outboard: Johnson 15hp smoker
MMSI Number: 10
Location: Gillingham, Dorset
Has thanked: 3 times
Been thanked: 23 times

Re: Johnson 15 oil leak?

Post by KevW » 25 Jul 2018, 20:46

Update....gearbox oil okay and no sign of anything after running again so suspecting it was unburnt oil and wondering if I did something daft and put too much oil in the mix. Any way all is good.

Post Reply

Return to “Outboards”