Refueler
N/A
2000 yr J 3 ....
Mercury 3.3hp 2 Stroke - No water through Tell Tale.
- Thread starter Polybus
- Start date
2000 yr J 3 ....
Mark-1
Well-Known Member
I don't think the head is the problem - on most OBs the tell tale is upstream of the engine itself - all it proves is that the pump is working and the tube up the leg isn't blocked.
It seems to me you've proved the pumps working. You've proved the pipe is clear. The only time you see a problem is when the gearbox is bolted on and the pipe engaged with the gearbox. That must be telling us something....
Or could there be something crazy you're missing about the pump? For some reason it's not working when bolted on? Could you put your finger over the tell tale hole and see if there's negative pressure? If it's sucking then you know the pump is going backwards. (Not sure how that could happen.)
I can't wait to find out what the problem is.
Polybus
Member
OK - here's some photos and videos of the Evil Outboard.
Hopefully the names describe the content.
And still no water from the Tell Tale.
(The videos are too big to upload here, so this link will take you to them on my Google Drive)
I hope someone spots something I'm doing wrong.
The Impeller is actually new - but the blades now look a bit worn, but once in the Water Pump housing they look OK.
Mariner 3.3hp – Google Drive
Hopefully the names describe the content.
And still no water from the Tell Tale.
(The videos are too big to upload here, so this link will take you to them on my Google Drive)
I hope someone spots something I'm doing wrong.
The Impeller is actually new - but the blades now look a bit worn, but once in the Water Pump housing they look OK.
Mariner 3.3hp – Google Drive
Mark-1
Well-Known Member
Wonder if there's simply not enough pressure from the pump? It doesn't look that enthusiastic and it would (I think) explain everything.
Polybus
Member
I agree - that would explain it all - but why would there be low pressure coming out of the pump?? Especially at high revs.
Mark-1
Well-Known Member
Agree, you'd think as revs increase there would eventually be some water visible but it seems that *is* the issue rather than a blockage.
Are there many gearboxes available second hand in your part of the world? Can you check the impeller housing isn't bent or distorted? Is the impeller housing cracked and/or leaking?
Polybus
Member
Is the a correct way to put on an impeller?? ie: is there an side that must go up and a side that must go down?
LinTeal
Well-Known Member
At start of season I motored around the marina in my tender testing my Mariner 3.3 and noted no water from tell tail.After 10 mins buzzing around .... suddenly water flow.So maybe persevere re borrowing a tender .Long shot I know but you seem to have exhausted most other options.
jamie N
Well-Known Member
Don't think this a stupid question, but are you running the engine with the cover on or off?
On my Tohatsu version, when I first acquired it, the tell tale wouldn't allow flow with the cover on, so I repositioned the tell tale to make the run of the tube easier, and it worked perfectly.
If it's not right, then best of luck!
If it's not
On my Tohatsu version, when I first acquired it, the tell tale wouldn't allow flow with the cover on, so I repositioned the tell tale to make the run of the tube easier, and it worked perfectly.
If it's not right, then best of luck!
If it's not
VicS
Well-Known Member
What you are doing is correct............. Either way up ... no differenece.
I agree the performance in the "drill test" doe not look very good.
You say the condition of the impeller is not good despite being new ... I think I would change it
What is the condition of the pump housing liner Did your kit include a new one ? Is it fitted correctly ( I doubt if it could be fitted incorrectly though)
Did you fit a genuine Mercury overhaul kit ?
I am thinking that either the impeller is worse than you think or there is a mismatch between the parts in you kit.
Mark-1
Well-Known Member
Sounds like you had a temporary blockage of the tell tale hole itself with the bulk of the water correctly still going to the engine.
Mark-1
Well-Known Member
If there's a housing liner I wonder if it's missing and the impeller's mainly just sloshing water about in the hosting.
Either way I think Vic S has nailed this.
I've learned a lot in this thread, thanks to everyone.
VicS
Well-Known Member
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lustyd
Well-Known Member
Where is the jet of water coming from that goes sideways from the leg? that looks pretty strong and would indicate a leak from the pump.
You could test the pump pressure with some poly tube and see how high it can pump. just need some with the right outer diameter tied up a wall or fence and you'll easily see how much pressure you're generating and whether it could reach the engine. My money is on that side leak though, I can't imagine what would cause a jet like that!
You could test the pump pressure with some poly tube and see how high it can pump. just need some with the right outer diameter tied up a wall or fence and you'll easily see how much pressure you're generating and whether it could reach the engine. My money is on that side leak though, I can't imagine what would cause a jet like that!
VicS
Well-Known Member
lustyd
Well-Known Member
No in the video of the pump running it's shooting out sideways to the top of the video. Looks like the hole or whatever is in line with the shaft. At first I thought it might be one of the intake holes but couldn't account for the pressure coming out! The pressure of the jet recuded as the assembly was lifted
lustyd
Well-Known Member
VicS
Well-Known Member
Vent hole to allow air in the pump to escape ????
Mark-1
Well-Known Member
That jet needs explaining but my outboard pushes water out through gaps in the front/sides and is clearly intended to do so possibly just that. Looks like quite a powerful jet, though, so quite suspicious.
There's a very simple test, if the OP puts his finger over that hole to stop the sideways stream and all of a sudden water starts to shoot out of the tell tale, that's conclusive.
lustyd
Well-Known Member
It would be a strange engineering decision to place such a vent on the compression stroke of the impeller though, before the liquid could exit. That said, the various angles of pictures has me questioning how everything is oriented, for some reason I can't marry up all the upside down and right side up pictures in my head no matter how many times I look. Mark is right though, a quick finger test will rule it out or in.
