Mariner 40hp Exhaust/water questions

[akirk]

Just tested my engine for the first time (bought the boat a few weeks ago, but it has sat until I had time).

I will say up front that I have very little technical knowledge

the exhaust seems to be coming out of the engine in an unexpected place between the top and the leg... is this normal or indicative of an issue? - see this video...

‪Mariner 40HP Exhaust‬‏ - YouTube

many thanks

Alasdair
(n.b. also asking a question about water exiting engine)


Having just tested the engine tonight, a couple of questions - this one about water...

as you can see from the photo and video below I have a good strong telltale which is great, however I also have water coming out of a few other places - as I basically have no knowledge of engines I thought I would check whether this is normal or not!?!

places of exit marked on photo...

regards

Alasdair

(N.B. also posted question ref. exhaust...)

‪Mariner 40HP running‬‏ - YouTube

[Nos4r2]

The exhaust coming out of there could well be an issue with the powerhead to leg join.

As both your questions are about the same engine I've merged the two questions and retitled the thread.


If you're about tomorrow during the day I'll pop in and have a look if you like-drop me a PM.

[akirk]

Thanks - wasn't sure whether one thread or two would be better as different questions!
Not entirely sure about tomorrow as am out am - will pm you

regards

Alasdair

[Boats&Outboards]

You should be able to remove that lower cowling to get a better idea of any damage etc.

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[captnjack]

The exhaust gases from up by the cowling is not normal.
The water from the rear portion of the lower unit is fine (normal).

[spartacus]

Originally Posted by captnjack

The exhaust gases from up by the cowling is not normal.
The water from the rear portion of the lower unit is fine (normal).

Exhaust manifold - regards puffs of smoke near the cowl? Involves taking the engine block off to investigate.

[akirk]

Thanks guys - useful... I guess I need to take it to the local bod who deals with engines... Is there any problem in putting the boat in the water and trying it tomorrow - or am I risking potential damage?

the chap I bought it from was using it the previous week...

regards

Alasdair

[Boats&Outboards]

Originally Posted by akirk

Thanks guys - useful... I guess I need to take it to the local bod who deals with engines... Is there any problem in putting the boat in the water and trying it tomorrow - or am I risking potential damage?

the chap I bought it from was using it the previous week...

regards

Alasdair

Not looked into fully but if it's an outlet issue rather than the water-cooling system I'd guess it's not going to be affected by launching it for a full test. Only problem I see is if the powerhead gasket gives way and let's water in where it shouldn't

I'm not an engineer though, I have guys who do all that for me!!

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[captnjack]

Originally Posted by akirk

Thanks guys - useful... I guess I need to take it to the local bod who deals with engines... Is there any problem in putting the boat in the water and trying it tomorrow - or am I risking potential damage?

the chap I bought it from was using it the previous week...

regards

Alasdair

Take the cowl off and see if you can tell where the "puffs" are coming from. It may be the exhaust manifold but might be something obvious. I don't think I would do more than a very short range trial since you might be rowing home!

[akirk]

Thanks - will be putting boat on the Thames, so worst case is about 5 yards to a bank!
will have a look at it - anyone who has other ideas, do chip in - but will take it to a mechanic - will try and persuade my car mechanic to have a look (don't think he likes boat engines - but an engine is an engine! so will try and persuade him...)

so many thanks for all the help

Alasdair