Does this steam look abnormal?

[Larson70]

1982 Mercury 70 hp. I have another thread but just wanted to get this clarified quickly. Last time i was on the water after 20 min of boating it stalled. I replaced a bad needle valve and the gaskets on the exhaust baffle. The other symptoms are on my other thread. But I just wanted to know if this amount of steam is normal at a outdoor temperature of 75 degrees.

 

[ShowMeGuy]

Re: Does this steam look abnormal?

with my mid70's 85 hp. i cant get it much hotter than luke warm..... that seems to me as as exhaust baffle gasket is leaking.......

 

[aussieflash]

Re: Does this steam look abnormal?

Most tstats open at around 145-150d.Thats pretty hot.Mine steams but my temp gauge still under 1/2 way.Looks like flow is strong.Whats your block temp and gauge temp?

 

[Larson70]

Re: Does this steam look abnormal?

it cant be the exhaust baffle gasket because i just replaced it, all 3 of them actually and there was no warping and the bolts are torqued evenly to spec. My unit does not have a thermostat or a temperature gauge for that matter. What about all the lower gaskets connecteing the power head to the mid section, would any of them allow for leaking of exhaust

 

[Maxz695]

Re: Does this steam look abnormal?

http://www.ebay.com/itm/Mercury-Mar..._Accessories_Gear&hash=item53e4db7c21&vxp=mtr View attachment 17084127-38501 1 ML81 I hope you checked the exhaust housing when putting them new gaskets on. Mine had 3 hairlne cracks in it. My new plates show up today with the last of the three gaskets. The video is showing it running way to hot. I would find the problem before you continue to run that engine. I,d really hate to see all them parts on ebay. It won,t hurt to pop the powerhead at this point and redo the gaskets on the exhaust spacer and the midsection. Also to check for blockage from blown impeller in the exhaust plate. http://www.ebay.com/itm/QUICKSILVER..._Accessories_Gear&hash=item35adc84670&vxp=mtr

 

[Larson70]

Re: Does this steam look abnormal?

Well i just changed the exhaust baffle gaskets yesterday and this is the run directly after it, i guess the next idea is the midesection to power head. I think there are 3 gaskets there as well from the looks of this kit:

http://www.iboats.com/mall/partfind...gd_poid=109264&gd_row=16&session_id=170547197

 

[Maxz695]

Re: Does this steam look abnormal?

Why am I not seeing the water coming out ot the rear exhaust? There should be two hose one from the top to the TT and one from the fuel pump to the back of the exhaust plate. This may mean you have blockage somewhere possibly in the flow through the fuel pump. Remove the hose and check for flow. You should have a bit more flowing out of the two holes in the back of the midsection. This is showing restriction somewhere

 

[emoney]

Re: Does this steam look abnormal?

You would serve yourself well by buying either a temp gauge or a digital thermometer to confirm what temps it's hitting. Water flow out the tell tale isn't the only thing to look for in outboard cooling, of course. Echoing Maxz's question, there should be at the least a mist coming out of the exhaust along with the water from the tell tale.

 

[Larson70]

Re: Does this steam look abnormal?

can you clarify this? what does the fuel pump have anything to do with cooling? And why would water be coming out the exhuast, i thought if it was that would signify a leak. Where is the water supposed to be coming out...the exhuast port in the propeller?

 

[Maxz695]

Re: Does this steam look abnormal?

the water line runs through the fuel pump surounding it in then out not mixing with fuel mind you but it circulates through the outer regions of the pump. I have seen these clogged with sand and a hanger will reem it out. I ll take some pics for you. I cant run mine as my plates will not be here until this evening but it will give you an idea be back shortly

 

[Larson70]

Re: Does this steam look abnormal?

ok ill check that in a few hours when i get home...i'm assuming the line runs around that area and doesn't actually run threw the pump cause if the pump actually has 2 lines going through it, then it could be a bad fuel pump?

 

[Maxz695]

Re: Does this steam look abnormal?

2 part video on you tube http://www.youtube.com/watch?v=A9i_t0Dy8pA&feature=youtu.be http://www.youtube.com/watch?v=Jb_3_LXnNKc&feature=youtu.be Water should be spitting out the back two holes not pouring. If it,s not there is blockage in the pump or the plate. Weather or not this would cause an overheating senerio is unknown to me, but I am inclined to think the exhaust plate you replaced the gaskets on has an issue still

 

[Larson70]

Re: Does this steam look abnormal?

i appreciate the video. Ill get back to you about 3 to see if there is water pumping threw that other line. I really cant see it being those gaskets on the baffle. I triple checked everything when i installed in and torqued it properly. And took a straight edge to see if it was warped. Im thinking more along the lines of blockage or mid section seals

 

[Larson70]

Re: Does this steam look abnormal?

also i did notice while we were on the water before i fixed the exhaust baffle gaskets that the midsection got to be burning hot to the touch

 

[Maxz695]

Re: Does this steam look abnormal?

View attachment 170859 I would remove the power head and redo the gaskets clear any crap in there. check that the passage through the fuel pump is unrestricted Might as well redo the seals in the endcap while you have it off. Save the motor It,s a good motor

 

[Larson70]

Re: Does this steam look abnormal?

The fuel pump is not restricted, there is a good flow of water. Going to begin the tear down of the powerhead off of the mid section. I think this gaket kit has everything i will need to replace in there.

http://www.iboats.com/mall/partfind...gd_poid=109264&gd_row=16&session_id=451887975

 

[Maxz695]

Re: Does this steam look abnormal?

Not seeing the seals you might be better off buying seperately as there will be alot of non essentials in that kit for $84. The two gaskets your gonna need are here on ebay http://www.ebay.com/itm/Mercury-Mar..._Accessories_Gear&hash=item53e4db7c21&vxp=mtr and this gasket too http://www.ebay.com/itm/QUICKSILVER..._Accessories_Gear&hash=item35adc84670&vxp=mtr about 35.00

 

[ajgraz]

Re: Does this steam look abnormal?

You would serve yourself well by buying either a temp gauge or a digital thermometer to confirm what temps it's hitting.

Agreed with this. You must find out what the temperature is before we can truly know if it is too high.

Some questions: Are you sure the exhaust cover and baffle surfaces were good? What did you seal / dress your exhaust cover and baffle gaskets with? Did you use an anti-sieze or other lubricant on the bolts, and if so did you cut back on torque?

Do you see any evidence of moisture-fouling on the plugs?

Do you have a watertight tub, barrel or bucket big enough to submerge the entire LU into (above the intakes) so you can repeat that test in the video? I'd be curious if it steams then.

 

[Maxz695]

Re: Does this steam look abnormal?

It,s true that even mY engine when half way running right the water out of the tt was hot but not hotter than I could not keep my hand there. The steam is throughing my off. I don,t know what the temp outside was when you took the video. If the air was cool it might seem to be hotter than it actually is. If you have water spitting out of the two holes in the back of the upper midsection then before rmoving the powerhead as stated check the temp wirh a gauge.

 

[Larson70]

Re: Does this steam look abnormal?

im going to take a reading of the temp today