After installing new impeller

[Talon143]

1991 15hp Evinrude After I installed my new impeller (the other was trash) I cant seem to get the motor to fire. The last time I had it on the water it shut down on me and i had to troll home. Fuel was real low so I assumed I had run it out.With the impeller in such bad shape what damage might have been done and what should I do to correct it?

 

[Xcusme]

Re: After installing new impeller

Since you didn't post model number, we can only guess....is this an electric start motor?? Do you have spark to the plugs? Fresh fuel mix, vented tank. Primer bulb firm? If you have spark, try spraying fuel mix from spray bottle into carb throat, will it fire then? Kill switch engaged? Possibly water at the bottom of tank got sucked into the carb.<br /><br />When the motor quit, was this before or after the impeller replacement? If before, did the motor overheat? Do a compression test.<br /><br />If the old impeller flew apart, it's possible that parts of it got pushed up the water tube and could block cooling water to the powerhead.You won't know if you have a blockage until you get it running, just watch the temps when you do get her going. The impeller replacement would not prevent the motor from starting.

 

[Talon143]

Re: After installing new impeller

Model # E15EEIA How do I check compression if that is what I need to do.

 

[Talon143]

Re: After installing new impeller

sorry im new to this

 

[Xcusme]

Re: After installing new impeller

ok, pardner, now we're on the same page!<br /><br />you said,<br /><br />"Ive just replaced the impeller and the motor wont fire. The old impeller had only 2 blades on it. Last weekend it shutdown on me. I assumed it had run out of fuel as it was very low. Cold have I done some damage to the motor running it with a damaged <br />impeller?<br /><br />Ed, that's not a good sign having only 2 blades left on the impeller. A sure way to trash the motor is to run it with a blocked powerhead. A good advice is to get a service manual, if you don't already have one.<br /><br />I'd drop the lower unit again. At the powerhead, I'd remove the thermostat and try back flushing water back down thru the powerhead and see if you can see any bits of the impeller flushing down the water tube. I'd then fashion a water hose to the water tube and run water up thru the powerhead and check for good water flow.<br />I'll assume the motor got pretty hot and the piston(s) siezed in their bores. While it's cool, can you rotate the flywheel by hand?? <br />It's best to do a compression test of each cylinder after a bad overheat.Remove both plugs. Use a screw-in type compression tester on the first plug hole. Open throttle to wide open and pull rope for 5 or 6 compression strokes, note lbs. of compression.<br />Test other cylinder the same way. Both compression reading should be within 10% of each other.

 

[Xcusme]

Re: After installing new impeller

Originally posted by Eddy143:<br /> sorry im new to this

Hey, absolutely no problem! Glad to have you here at iboats.<br /><br />I just re-read my reply and perhaps I wasn't clear as to the reason for removing the thermostat. Your trying to force water thru the thermostat opening back down thru the powerhead and hopefully flush and impeller parts down thru water tube.

 

[Talon143]

Re: After installing new impeller

When I was trying to start the motor using the electric starter water was flowing from the outlet. I had the motor in a trash can full of water. the flywheel turns easly. A bit more info-when I was pull starting the motor for the first couple weeks I needed to put it in gear to get it to start.It seemed the throttle wasn't opening enough until I put I nudged it into gear. Using the electric thats not an option and the mount I have it on precludes pull starting

 

[Xcusme]

Re: After installing new impeller

That's a good sign that water was flowing from the tell tale, the new pump is working. There should be a neutral lockout that prevents you from opening the throttle too far, thats normal. When you shift into forward gear, then you will have full throttle. I suspect that you have a fuel delivery problem,possibly semi-blocked carb that wasn't supplying enough fuel in the normal start position to start the motor. Try leaving it in neutral,spraying some fuel mix from a Windex bottle into the carb throat and see if she pops off. Usually choking the motor supplies enough fuel to start her up when cold. This of course assumes that you have spark to the plugs. To test spark, remove one plug wire, insert screwdriver into boot. Hold shank of screwdriver 3/8" from the engine block and crank motor. Spark should jump to the block in a blue flash. Do the same with the other plug wire. If there's no spark on either wire, check engine kill switch lanyard. If kill switch is shorted you won'tget any spark.

 

[Talon143]

Re: After installing new impeller

I do have spark. I rested the plug on the power head caseing and turned it over there was spark on the plugs. what can I use to clean the carb and any other parts that might need it.

 

[Xcusme]

Re: After installing new impeller

Carb rebuild kits are available that include all the parts to put the carb in good working order. All gaskets,seals etc.are included. You'll remove carb and disassemble, spray or soak parts with carb cleaner. Use compressed air to blow out all passages. Assemble carb with new parts provided and reinstall. You would pay attention to the low speed idle circuit when cleaning to be sure all the smaller orifices are clean. Most carb problems are caused from fuel left in the bowl for long periods of time. It turns to varnish and plugs things up. A good carb cleaner usually cleans 'em up just fine.<br />Was there any water at the bottom of the fuel tank ? Sucking up a load of water will stop her cold.<br /><br />BTW, spraying carb cleaner directly into the carb throat does absolutely no good and can cause problems as there's usually no lubrication in the spray. This washes what little lubrication there is from the cylinder walls. For this reason using starter fluid is a no no too.

 

[Talon143]

Re: After installing new impeller

Thanks for your help I will try these things.