help the NooB!

[murdoch]

Hello, everyone! Hoping someone could give me some insight on on my 9.9 evinrude.
I was out fishing Sat and bumped into a submerged branch about as big as my arm while doing about 5 miles an hour. It caused the motor to jump a bit and run poorly. I thought I had bent my prop so I slowed and headed to the dock about a half mile away.
About a minute later, I smelled something extremely hot, like melting plastic, and some smoke coming from the motor, so I shut er' down and used the trolling motor.
When I got home I pulled the lower unit and the water pump had one vane broken off. I backflushed the engine through the thermostat hole and the water intake hole where the unit bolts on. I replaced the pump with a kit, new wear plate and housing, pump, o-ring, etc. The plugs look good, so do the pistons.(thru the plug holes anyway)
The problem is the engine runs crappy now. I used to start it up on the first or second pull with the choke on. It ran like a top, and I have always winterized it, as the fellow before me. Now, I have to crack the throttle about a third to get it to start, and it idles rough.
Anybody ever had this happen? What did you do?
Thanks!

 

[samo_ott]

Re: help the NooB!

What year and model # is it? Is it pumping water now ok after the pump rebuild? It's possible the impact loosened some crud in the carb and it plugged a port or something?

 

[murdoch]

Re: help the NooB!

What year and model # is it? Is it pumping water now ok after the pump rebuild? It's possible the impact loosened some crud in the carb and it plugged a port or something?

It's fairly new, or looks it. I haven't had to do much to it. Can't go outside and look because I am not at home. All I know is it is a new looking 9.9hp
I didn't think about the carb/crud. I know it started running bad as soon as I hit that branch.

 

[tashasdaddy]

Re: help the NooB!

check the compression, being hot could have blown a head, or exhaust gasket. which would make it hard to start and run crappy.

 

[murdoch]

Re: help the NooB!

check the compression, being hot could have blown a head, or exhaust gasket. which would make it hard to start and run crappy.

I'll try that too. Thanks.
GO GATORS!

 

[iwombat]

Re: help the NooB!

Sounds like hitting the branch either clogged up your water intake, or sucked enough crud up to toast an impeller. That, in turn, overheated your motor. Like previously posted, your head gaskets are probably toast. At the very least you should re-torque your head bolts.

Compression check should tell you what's going on though.

 

[kenmyfam]

Re: help the NooB!

Post your model nember and .....yes give it a compression check to begin with.

 

[murdoch]

Re: help the NooB!

ok...just did a compression test, top cyl is 30psi and bottom is 70psi. Sounds like trouble. I want to take the head off to look at the gasket and the head, but I can't find my dang shop manual.
Does anyone think the cylinder walls are scored?

 

[iwombat]

Re: help the NooB!

They certainly COULD be, but it's more likely that you just warped the head and blew a gasket with the overheat. Pull it out as soon as you can so that any water that leaked into the cylinders is removed quickly. With luck, you caught it before any real damage occurred.

 

[samo_ott]

Re: help the NooB!

30lbs and 70lbs? wow... surprised it ran at all!

 

[murdoch]

Re: help the NooB!

I pulled the head the head off the same day of my last post. The head FELL off the block when i pulled the last bolt out. The gasket didn't have anything too obvious, but it did look like some blowby was occurring from the top to the bottom cyl. Cyl walls had some very light scoring, looked normal with plenty of crosshatching still visible.
I ordered a new gasket, got it today, was gonna take it to my buddy's machine shop(he specializes in aluminum)and get him to put it on the sanding belt and straighten it out.
Still can't find my manual, does anyone know the correct torque and sequence on the head bolts?

 

[murdoch]

Re: help the NooB!

ok, just thought I'd let you all know that there is a happy ending.
Took the head to my buddy, he surfaced it, also said it was pretty warped. I put the new head gasket on and torqued everything down. Did a compression test before I bolted anything else on, got 100 psi out of each cylinder, bolted it all together with new head gasket and fired it up.

RUNS GREAT!!!!!