'94 Evenrude 140 water flow

[Rick Stephens]

Hi all,

Working on a customer's E140TLERR (ser G 03523014), a '94 V4 140 HP. He moved into the area 4 years ago and the boat has been sitting stewing in its old gas ever since. Nice setup for cleaning the fuel tank out as it comes out of this hull in about a half hour. The whole deck comes up with a handful of screws. That done, kitted the carbs, replaced the fuel lines and primer bulbs and went to tune it up. It won't push water out the telltale. Water flowing out around the prop and drains in the lower, but nothing up top.

So, pulled the lower figuring the pump was shot. It don't look too bad. There is some set on the impeller. But it is reasonably soft and pliable. Ordered a complete new pump for it though. Not installed yet.

The one surprise is if I blow air into the water pipe that goes up through the exhaust housing, no air whatsoever escapes from the motor. Nada. I am not sure it is an open system, but seems it would have to allow some water to bypass the thermostat just to keep the pump form melting in its own juices.

Thoughts?

Rick

 

[oldboat1]

Probably a critter nest. Use a piece of weed whacker line and shove it up in the tell tale outlet as far as you can, twisting it as you insert it.

 

[Rick Stephens]

Probably a critter nest. Use a piece of weed whacker line and shove it up in the tell tale outlet as far as you can, twisting it as you insert it.

Thanks for the thought. Even easy enough to pull that line off the block entirely. I'll give er a go.

Rick

 

[Bosunsmate]

Yeah ive often wondered that about the 80s and some 90s v4 and v6s about what happens with all the impeller pressure when the system is closed from being cold and poppets shut due to low rpm. Ive never found a relief port but would of thought there would be one and not just the telltale exit. Interested to hear any resolution on that point.

 

[Rick Stephens]

Yeah ive often wondered that about the 80s and some 90s v4 and v6s about what happens with all the impeller pressure when the system is closed from being cold and poppets shut due to low rpm. Ive never found a relief port but would of thought there would be one and not just the telltale exit. Interested to hear any resolution on that point.

That went well. Pulled the hose off the block, the tell tale hose was clear. Tried to blow through hose into block - no go. Pulled the fitting off the block and it is plugged tight. Cleaned that out, now air put to the inlet line inside the exhaust house vents through that hole. Cap that hole, no exit at all, completely tight. So yeah, you wondered right. The engine passes zero water into exhaust until the valves open.

 

[Bosunsmate]

Wow great info, im picking thats the same for earlier models, im surprised it doesnt pop a seal somewhere.
Thats my lesson learnt for today Thanks
On my 1980s 60hp im pretty sure it comes out a small front bypass when cold but i may be wrong, im definitely going to check in spring here in two months

 

[Faztbullet]

There are bypasses cast into block and adapter plate..motors are not sealed systems!!! Either adapter plate or water tube is blocked ...

 

[racerone]

There are just so many wild ideas on how outboards work.-----Well done Faztbullet for explaining once again.----The exhaust on an outboard can not run dry.-----Has to be water cooled as soon as motor starts !

 

[Rick Stephens]

There are bypasses cast into block and adapter plate..motors are not sealed systems!!! Either adapter plate or water tube is blocked ...

I was totally surprised that with the lower off, I could get no air through the block whatsoever putting a little air into the pipe. There has to be some way for the block to fill up and the telltale doesn't seem nearly sufficient. I'm not sure how to proceed to make this motor's cooling system well again.

 

[ct1762@gmail.com]

well sounds to me like the powerhead needs to come off to get to the water tube grommet underneath. those can get blocked, rolled or cracked. just had an example this week of a crossflow v4 were the guy took a pair of vice grips to "reposition" the water tube to fit into the pump. pulled the powerhead and apparently he had also pulled down on the tube and it was only partially seated. never saw that one before!

 

[Rick Stephens]

well sounds to me like the powerhead needs to come off to get to the water tube grommet underneath. those can get blocked, rolled or cracked. just had an example this week of a crossflow v4 were the guy took a pair of vice grips to "reposition" the water tube to fit into the pump. pulled the powerhead and apparently he had also pulled down on the tube and it was only partially seated. never saw that one before!

That doesn't quite seem right with water able to flow to the telltale, but if I block the telltale the block is sealed tight from pressure applied to the water tube. If it was blocked at the base of the power head it wouldn't flow clear to the tell tale port. And if it was cracked or twisted it would leak there.

I might post a short video of how it is working. Plug a rubber tipped air gun into the water tube, air flows out the tell tale. Block the tell tale, no air flows at all.

I appreciate the thinking though!

 

[Rick Stephens]

I think I might have to rig up a hose fitting to the water tube and see if I get water out the exhaust as the motor warms up.

 

[Bosunsmate]

There are bypasses cast into block and adapter plate..motors are not sealed systems!!! Either adapter plate or water tube is blocked ...

Good to know, this was puzzling me.
I think Rick has a blockage down in the adaptor plate then.
Rick Is it a salty? Those can be a pain to undo the powerhead to midsection bolts but its always a winnable battle

 

[Rick Stephens]

Good to know, this was puzzling me.
I think Rick has a blockage down in the adaptor plate then.
Rick Is it a salty? Those can be a pain to undo the powerhead to midsection bolts but its always a winnable battle

Yup. Moved from San Diego to here in Idaho. Not a lot of corrosion though. Must have done a good job flushing.