Damn; Just damn

[boscoe99]

Talk about bad luck.

Mouse pee is very corrosive.

Powerhead question 2007 225 e-tec - Owners Message Board

[fairdeal]

Nasty!

And one more piece of evidence in the 2 stroke v. 4 stroke argument...

[robert graham]

How in the heck did the little bugger work his way all the way through the exhaust system to the cylinder??....that's amazing!!

[boscoe99]

I have read about mouse's (mice) being able to make themselves really, really small in order to get through a hole that is much smaller than their little rat like body. They are good at climbing also.

Looks like he laid in a goodly supply of sunflower seeds for the winter.

Wonder what PETA will have to say about destroying the little critters home?

[TownsendsFJR1300]

I'd like to see that cylinder with the nest out and cleaned up to see how damaged the cylinder actually is...

[Jason2tpa]

Incredible. Honestly, I couldn't conceive this was even possible. Amazing.

[cpostis]

Not familiar with late Evinrudes, but I do know the small rats/mice can pass through a 1/2" diameter passage. The heavy fleet maintenance facility and administrative offices I maintained has a 24 bay garage where we took care of a fleet of city trash compactor trucks and other heavy equipment. These trucks are parked in a lot adjacent to the garage. Until we sealed every nook and cranny with 1/4" steel mesh we had mice/rat problems. Even then, one of the biggest problems we had was rodents eating away at the wiring and hydraulic hoses within the trucks. Wound up allowing stray domestic cats on the property that kept the problem to a minimum.

They are determined boogers!!!

[robert graham]

I'd like to see that cylinder with the nest out and cleaned up to see how damaged the cylinder actually is...

Yep, maybe it's not totally fried....I'd probably just try and crank the motor up and blow all that mouse junk out the exhaust....same way he came in!

[TownsendsFJR1300]

Yep, maybe it's not totally fried....I'd probably just try and crank the motor up and blow all that mouse junk out the exhaust....same way he came in!

That's my thought, but not run it until all cleaned up..

Might get by with a good clean up, very light honing depending how deep in the bore and how bad the rust / pitting is....

I'd do that WAY before I just dropped a power-head on it. If compression / leakage is inside spec's it should be good...

[pstephens46]

Wonder if the bottom of bore is more corroded that top. Filth settles....

[TownsendsFJR1300]

Looking at the pic, it appears the engine was stored vertical so I think we're looking at the worst of it. (the nest sits on the bottom of the the cylinder)

It'd have to get past the compression rings too. I'd think the grass soaked up a good part of the urine, but of course it's still nice and moist with an acidic liquid
in that confined space...

[cpostis]

Considering if the damage is beyond honing repair only, I wonder if an alternative it might be appropriate to re-sleeve the cylinder rather than oversize boring and piston/ring replacement (Would one cylinder bored oversize be appropriate or not?). Of course ring replacement should be included, but would you have to replace the piston? In either case, you would have to disassemble the motor for repairs? I do see that E-tech cylinder sleeves are available.

Here's a post from another forum.

"When you sleeve a cylinder, you bore out the existing hole to fit the diameter of the new sleeve. The inside diameter of the sleeve is the same as the diameter of the existing cylinders so the piston will be the same as the ones you currently have. The machine shop will bore out the cylinder to the outside diameter of the sleeve, cool the sleeve and heat the block and press the sleeve in to place. Exhaust ports will either be cut before or after the sleeve is installed depending on the shop and the supplier. I have done it many times and it is just as good as the engine mechanic putting it all back together. I would rather do this than bore the cylinder to remove the damage and install an oversize piston."

[boscoe99]

Honing only might work, boring to the over size piston might work or re-sleeving might work. Or, a replacement block could be in the owner's future.

Many ways to get back to the point one was at before.

Boring only one cylinder to accommodate an over size piston is perfectly acceptable.

[TownsendsFJR1300]

Considering if the damage is beyond honing repair only, I wonder if an alternative it might be appropriate to re-sleeve the cylinder rather than oversize boring and piston/ring replacement (Would one cylinder bored oversize be appropriate or not?). Of course ring replacement should be included, but would you have to replace the piston? In either case, you would have to disassemble the motor for repairs? I do see that E-tech cylinder sleeves are available.

If you punch it one size over, you definitely need a new over sized piston and rings..

And yes, your going to need that block stripped down to an open hole (cylinder) should you punch it. It also needs to be stripped if re-sleeved.

If it's getting broke down for sleeve or punch, I'd probably just re-sleeve it.

Labor will be high for the tear down (if the shop does everything), machine shop, maybe $100 I'd think...