Loud Clunk / Thud while under power

[grady19tourn]

Hi, has anyone experienced what feels and sounds like your outboard hitting a log? I have a 1985 evinrude 110. Periodically I get this quick clunk in the lower unit. The other day I was at 75% throttle and I timed this thunk every 17 to 20 seconds. At slower speeds seems like it happens every few minutes. Any ideas?

 

[HighTrim]

Re: Loud Clunk / Thud while under power

Welcome to iboats.

Unfortunately I have bad news for you, classic symptoms of a worn clutch dog. They are kind of expensive for what they are.

 

[Daviet]

Re: Loud Clunk / Thud while under power

Could you list your model#, I can't match the year and horsepower.
You might want to start by checking your lower unit oil for metal shavings.
Maybe the shift dog is jumping on the gear.

 

[kenmyfam]

Re: Loud Clunk / Thud while under power

I am with the clutch dog group as well.
It no be cheap !!!

 

[grady19tourn]

Re: Loud Clunk / Thud while under power

Sorry, 1987 (not 1985)
Evinrude 110

 

[grady19tourn]

Re: Loud Clunk / Thud while under power

When I changed the lower unit oil, the drain plug had a sliver of metal attached (as if the plug were magnetized) could this be from the clutch dog? Any ideas on the cost to work on a lower unit?


i was hoping someone would suggest a spun hub, but since there is no change in rpm's is that unlikely?

 

[Daviet]

Re: Loud Clunk / Thud while under power

You might try removing the bearing housing in the lower unit and see what kind of damage is there. I don't think you will like the cost of repairs if there is a lot of damage.

 

[grady19tourn]

Re: Loud Clunk / Thud while under power

Thanks for your help. Just gotta grin and bear it.

 

[Fisherball]

Re: Loud Clunk / Thud while under power

The bottom LU fill screw IS magnetized to catch those shivers b/4 they damage something else. I think (Hope!) a few shivers of metal is normal wear & tear.

 

[HighTrim]

Re: Loud Clunk / Thud while under power

Nope unfortunately not a spun hub.

 

[grady19tourn]

Re: Loud Clunk / Thud while under power

It was the clutchdog. Took the mechanic three hours to dissasemble lower unit inspect gears, replace clutch dog, and while we were there replace the water pump.
Thanks again!

 

[boobie]

Re: Loud Clunk / Thud while under power

Just curious, did he replace the forward gear as well ?