exhaust somke coming out of both thermostst openings

[alley mechanic]

I finnelly had a chance to try out my motor in the water trough and see if my water pump was ok after rebuilding it, well after starting it up tell tale was pissing very strong so I thought all was well but engine was in quick start warm water pressure was 13 pounds thought that's odd never was that high before after I replaced water pump engine rpm was twelve hundred rpm and was waiting for ouick start to drop out but after 5 min cylinder were ice cold yet or just luke warm , so I pulled off the thermostst cover and checked both thermostats for dirt holding them open both were very clean so I started motor with both cover to check water flow and exhaust smoke came of of both openings than the water I don't think this is normal I flushed motor several times with stats out and didn't have smoke coming out of them and I think water is bypassing the stats and keeping the engine cold so it wont warm up its a 98 evenrude 115 intruder could the base gasket be blown? .

ally mechanic

 

[F_R]

I'm not sure what you are saying here. Are you saying you are running it with thermostats and covers off? Well think about it. The water normally goes onward to the exhaust housing to keep it cool. So if water isn't flowing it makes sense that the exhaust would backflow through the system. At least that is the way I see it.

 

[alley mechanic]

yes I was running with caps off and stats out just for a second to flush engine out, when doing this I saw exhaust coming out of both thermostat openings, also the engine wont get to operating temperature both banks after 5 min still very cold not even warm enough to disengage quick start it was fine when I put it away last year I just put a new water pump kit in it and was the first time I ran it this year

 

[alley mechanic]

forgot to mention the exhaust came first than water out of both openings

 

[F_R]

Am I correct thinking that has springs holding the thermostats down? Those act as pressure relief valves so they lift to allow increased water flow at high speeds. High water pressure is probably holding the 'stats off their seats. If it is abnormally high, well I don't have an answer for that. Maybe somebody else will chime in here

 

[alley mechanic]

yes tou are correct springs hold thermostats on seats at low speed and pump pressure pushes thermostats off seats at higher speeds for more colling

 

[racerone]

That is all normall !!-----Put the thermostats in and go boating.

 

[Bosunsmate]

That is all normall !!-----Put the thermostats in and go boating.

I dont think an ice cold to luke warm motor after 5minutes is normal at all

 

[alley mechanic]

no its not right, I have owned this motor since new on a very cold day and cold water I normally takes 2 min to disengage the quick start warm up mode , I have changed out about four water pump kits that I have acquired from the omc days and never had a issue now I have used a new kit from brp and they have a procedure at the end of the installation that says after water is all done to turn the drive shaft counter clockwise to disengage the impeller than pull up on driveshaft and turn drive shaft back clockwise to lock impeller in a lower position, doing this they say will make the pump increase its efficiency, I have never done this on my motor and never had a problem, I was doing some research on the etech owners web site and they talked about this new procedure and they said they have found that this procedure has made there etec motors run a lot cooler some say when they ran in the great lakes with the cold water there motors a just above idle were running about 110 degrees to 105 degrees which I belive is too cold .

 

[racerone]

That procedure would have nothing to do with operating temperatures , not one bit.------But make sure you have the correct waterpump kit installed.--There are some diferences.---Model # of your motor is ?---Part # of the kit that you installed is ?

 

[alley mechanic]

ITS A 98 115 INTRUDER MODEL E115GLECM KIT NO 5001594 IT SUPERCEDED 434421

 

[Bosunsmate]

Well increased water pressure could make the thermostats back off their seats more than they should, so if BRP reckon that is the case then i would think they have their reasons, maybe you should reinstall without doing the extra fancy bit

 

[alley mechanic]

ok I just got in from the outside , I ran the engine in my water trough quick start engaged twelve hundred rpms let it run for 4 min cylinders and head ice cold, 15 lbs water pressure I have a quick start by pass switch installed on my motor so I can disengage quick start if im in a hurry to get the out of the way for other people well rpms go down to 950rpms water pressure goes down to 10lbs than in 2min motor is already 120 degrees after 6 min its 140 degrees so I increased rpm with the throttle back to 1200 rpms motor starts cooling right away back to 63 degrees or so after a couple of min this is telling me at 1200 rpm with 15 lbs water pressure stats are being pushed of seats .

 

[Bosunsmate]

yep, now whats the solution

 

[alley mechanic]

ok sunday im going to drop lower unit and unlock the impeller key and let the impeller position it self like I always did , in other words im not going to do the procedure brp states on the information packet that came with the new pump kit I described the procedure in a previous post I will post back tomarrow on the results

 

[alley mechanic]

ok I pulled down lower unit and unlocked the impeller key and let the drive shaft drop what little play it has which makes impeller go back to its normal position in other words a normal water pump installation and forgetting that last step in the brp installation packet, started it up in my water trough problem is still there water pump pressure did drop 3 pounds to doing a normal installation ran motor 5 min only got to 70 degrees starboard and port engine was in quick start mode 1200 rpms so I pulled thermo stat covers off and stretched a old stat sping do see if it had any effect on warming up it did not motor will not reach 105 degrees to disengage quick start, so it thew my manuel bypass switch to turn quick start off motor goes back down to normal idle rpm in 2 min engine was 125 degrees already? in than proceded to run the engine at 1500 rpm and water pressure went to 20lbs not right and started cooling motor off right away I am at a loss water is some how cooling engine with stats closed or bypassing with the high water pressure my thermostat seals a very good inside engine when looking in stat opening looks very clean too, I want to thank every body for the comebacks .

 

[Bosunsmate]

I cant recall this whole thread so for everyone else who cant can you answer the following-
Have you tested your thermostats dont open until they are hot?
Hows the engine running? A sick engine wont get to temperature easily at all but obviously a not warming up engine is sick too.

Have you tried jamming your stats in their seats withsomething behind it so they wont move off their seat that way you will see if thats the problem or something odd is elsewhere in the engine.
Stretching the spring is actually not going to make it harder to open, you need to add another spring or shorten the distance somehow.

 

[Bosunsmate]

and is the temperature similar between the two heads?

 

[alley mechanic]

no I have not tested the thermostats in a pan of water I will do that tomarrow, all four cylinders ice cold in quick start mode when in idle mode by my quick start by pass switch engine starts getting to normal temperature real fast as soon as you seed up the engine say 1200 rpm it starts cooling again I did not have this problem at the end of last year on after I replaced the water pump with a new brp kit I have done 4 water pump changeouts never had a problem I have owned this evenrude 115 intruder since day one runs very well.

 

[sbump52]

Think I would run it on the lake rather than a trough and see how it does.