1989 evinrude 150 overheating

[snookslayer39]

I just got an 89 [E150TXCEM] evinrude that had been sittind for about 18 months got her running rebuilt carbs took her out ran fine about 10 mins started running hot so i took it home and replaceed water pump lower unit oil ect took it back out yesterday and same thing telltale shows water and preassure was great at first but after about 10 mins of operation preassure drops off and overheat ?? any advice would be greatly apreciated thanks

 

[gsyfishy]

Re: 1989 evinrude 150 overheating

Check your t-stats, one on each side, when you have them off, check all the water lines. Soak the stats in straight vinegar for an hour, you can check their operation with hot water and a thermometer, they should open at 140 c.

 

[HighTrim]

Re: 1989 evinrude 150 overheating

Welcome to iboats.


I would change out the t stats and pressure relief valves. Flush cooling system as stated.

 

[emdsapmgr]

Re: 1989 evinrude 150 overheating

What are you seeing when you say the pressure drops off? A new impeller should pump around 7-8 lbs at idle and 18 when on plane.

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

What are you seeing when you say the pressure drops off? A new impeller should pump around 7-8 lbs at idle and 18 when on plane.

ok idling out channel from boat ramp was reading about 8 on gauge got her out to main channel and opener up wot gauge was steady around 22 temp fine went about 3 miles and noticed temp rising so i turned around and about half way back brought it down to about half throttle to ovoid over heat by the time i got back to ramp was just under overheat with alarm (that had been on the whole way back) preassure was 0-2 at half throttle telltale was decreased thanks for your help

 

[James R]

Re: 1989 evinrude 150 overheating

When you replaced the pump did you replace the housing and the seals.
If the housing is scored it could have chewed up the new impeller or a seal could have let go.

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

When you replaced the pump did you replace the housing and the seals.
If the housing is scored it could have chewed up the new impeller or a seal could have let go.

yes replaced entire pump housing included put in 2 new t stats and relief valves flushed moter as best as i could thru pipe from pump when i had the lower unit off

 

[gsyfishy]

Re: 1989 evinrude 150 overheating

VRO???, are you pre-mixing, get some seafoam in the spray can, pull each plug and shoot some in each cylinder, let it sit for awhile. This will loosen up any stuck rings, and break up some of the carbon.

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

VRO???, are you pre-mixing, get some seafoam in the spray can, pull each plug and shoot some in each cylinder, let it sit for awhile. This will loosen up any stuck rings, and break up some of the carbon.

Im running on the vro and im 99% sure its working ok as far as the seafoam i already did that when i first got the motor please excuse me for not providing that info already but here goes. this is whats been done so far rebuilt carbs replaced all hoses on feul system (even the small ones on the primer solenoid ) replaced plugs replaced water pump entirely new seal and oil in lower unit the motor runs extremly well

 

[emdsapmgr]

Re: 1989 evinrude 150 overheating

A new water pump impeller should idle around 7-8 lbs. It's not a good sign if the idle pressure was 0-2 lbs. I'd pull the lower and check the impeller.

 

[Fl_Richard]

Re: 1989 evinrude 150 overheating

Did you put the locking key on the impeller? If not it can pump at idle and slip completely at higher speeds.

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

first of all thanks for the help i pulled lower unit today water pump is perfect key intact i see no issues here im gonna pull tstats and check for blockages any advise on what to flush with to clean out corroision sand ect.

 

[emdsapmgr]

Re: 1989 evinrude 150 overheating

That's good news about the impeller. You should check the hose barb that feeds the line to the water pressure gauge. You may find some debris in it, restricting flow-causing the gauge to read incorrectly. Also check for weeds, debris in the stat housings.

 

[gsyfishy]

Re: 1989 evinrude 150 overheating

I tend to agrre with some sort of blockage, if you still have the LU of, you can plug the pick-up tube and use a de-corrosion agent designed for flushing salt water systems. Some will leak out of exhaust areas, but maybe mix it 50/50 and keep pouring it in until gone, wait 1/2 hour and flush generously with hose from T-stat ports on both sides. After the first start, let it idle on muffs for 15 minutes, then check T-stats again.

 

[kenmyfam]

Re: 1989 evinrude 150 overheating

Would this motor have been a salt water use motor previously ???

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

Would this motor have been a salt water use motor previously ???

Yes this motor is on a 204 angler used primarily in salt water

 

[kenmyfam]

Re: 1989 evinrude 150 overheating

Yes this motor is on a 204 angler used primarily in salt water

At this point personally I would bite the bullet, get new head gaskets, whip the heads off and see whats going on with the water passages and deflectors. Especially with it being a salt water motor.
Just my current 2 cents though.

 

[emdsapmgr]

Re: 1989 evinrude 150 overheating

Pull the head covers off the head and check for blockages there. It will be an indication of what you may find in the rest of the engine.

 

[snookslayer39]

Re: 1989 evinrude 150 overheating

Hello again i finally got the time to pull my heads and im quite sure i found the problem some serious corrosion any advise on what to clean motor with there salt terminator and salt away ect there quite expensive and by what ive read they dont work well ??? I have new gaskets comming on the 5th but my manual is on backorder wont be here till the 11th i want to put it back together this week does anyone have the torq specs on the heads here are a couple of pics of head covers any advice would be appreciated thanks all

 

[gsyfishy]

Re: 1989 evinrude 150 overheating

White vinegar works great on salt build up, Last time I did my gaskets, I used a wire wheel brush on my cordless, NOT a stiff wheel. Buy a gallon of vinegar and soak the heads, then wire brush them.