Hot outboard

lockieboi · 06 April 2012, 19:38

I ran my newly purchased 15hp Johnson 1999 2 stroke today and I noticed that the leg of the outboard got pretty hot.

Water was coming out the tell tale as it should so I assume the cooling is ok but should the leg get hot? Or is there something wrong?
Thanks

ukprometheus · 06 April 2012, 22:12

Not much in the leg apart from a shaft down to the gearbox, have you checked the oil in the gearbox.

ukprometheus · 06 April 2012, 22:13

However there is the exhaust so that could be what's making it feel warm

Boats&Outboards · 06 April 2012, 22:17

Had it been the 4 stroke I'd expect the leg to be warm from the oil pan but no a 2 stroke shouldn't be "hot" to touch on its leg.

How hot are we talking ? Was the pumping water warm too ?

9D280 · 06 April 2012, 23:35

Warm fair enough. The exhaust is piped down there, and the cooling water should also exit via the same pipe to keep it cool...

lockieboi · 07 April 2012, 07:03

Thanks for all your replies.

I will probably run it again today and will check again.

lightning · 08 April 2012, 23:11

Is the fuel/oil mix ratio correct?

lockieboi · 09 April 2012, 22:02

Quote:

Originally Posted by lightning

Is the fuel/oil mix ratio correct?

Hi yes it's run at 50:1 which is what the seller and the manual says it should be.

lockieboi · 11 April 2012, 17:58

Update.
I've just had a chance to run the OB and the leg is hot after a short period of the OB running.
The tell tale is cool but the leg is probably about the same temperature as a freshly poured cup of tea. Bearable to touch for a short time if that make sense.
Hope someone can help with this or tell me if I'm worrying over nothing.
The OB is a 1999 Johnson J15REEA.

martini · 11 April 2012, 18:29

Quote:

Originally Posted by lockieboi

Update.
I've just had a chance to run the OB and the leg is hot after a short period of the OB running.
The tell tale is cool but the leg is probably about the same temperature as a freshly poured cup of tea. Bearable to touch for a short time if that make sense.
Hope someone can help with this or tell me if I'm worrying over nothing.
The OB is a 1999 Johnson J15REEA.

It's, normal, the leg is meant to cool from being immersed in water. The exhaust can make it quite hot to touch. I often see steam coming off mine

Boatnomad · 11 April 2012, 18:45

It is normal,the exhaust makes my 15hp warm to touch after a short time.

lockieboi · 11 April 2012, 18:56

Thanks for clearing that up.

hobnob · 17 April 2012, 22:16

Quote:

Originally Posted by lockieboi

Thanks for clearing that up.

Very approximately; pedants welcome to have a go....

Assuming 33% efficiency and WOT, a 15hp engine may be trying to shed 30hp of heat. That's about 20kw. Some is shed via the exhaust gases, some via the water - and remember most cooling water exits via the exhaust too.