1991 Evinrude 60 HP knocking, what did I do!

[Theeplaymaker]

Motor specs to start off with:
1991 60 HP 3 Cylinder Evinrude TLEIB on a 16' Bass Tracker Nitro 160 TF

I am not a mechanic or I wouldn't be here but I am not motor retarded, I did a good bit of stuff to this motor over the winter to hopefully make her last longer but I think I broke something...I did the service bulletin to relocate the pee hole to the top of the block-success. I deleted the VRO and went pre-mix-hopefully not my problem, I know I did this right. I had her out 2 weeks ago and ran it hard, easy, just cruised around all day and it was great! Ran a lot better with the new t-stat since it didn't have one before when it ran like *** around the docks and idling, no more with the new and updated T-stat. Last run before I brought her in and this knocking kicked in and it lost power. It ran fine on the muffs when home with no knocking, so I put some gas in her and took it down to the dock today suspicious for problems tho. Ran ok for 10 seconds then started knocking again. Needless to say I didn't take it out. Good fuel, plugs that are 1 year old but only have 5 runs on them, no compression test yet. I am looking for some solid help so whatever else I can supply please let me know!

Now for the videos.

This one is the launch that seemed to do her in. I believe the tach is correct so I didn't overrev but it has been acting up this year so maybe it is bad and caused me to break something. The problems started right after I stoppped shooting video.
Evinrude 60 HP out of the hole. - YouTube

This was at the dock today. Since it sounded good on muffs wanted to try to take her out but 10 seconds after I started it the knocing was back. This vid is after I had it started already.
How bad... - YouTube

Any more questions or needed info let me know. Really hoping you guys can help me on this one and that it isn't as bad as it seems to me.

 

[Faztbullet]

Re: 1991 Evinrude 60 HP knocking, what did I do!

Check the gearcase oil for metal.....

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

I get where you are getting at and right now I can't check that till tomorrow morning but if I do find metal just for s and j what are you thinking? Thanks

nothing but seasonal mechanics around where I am so I know it'll be a premium and I won't see my boat till august if I can't figure it out myself right now...thanks again

 

[Faztbullet]

Re: 1991 Evinrude 60 HP knocking, what did I do!

but if I do find metal just for s and j what are you thinking? Thanks

Pinion gear took a s, possibly from low/contaminated gear oil or a previous impact damage. if you remove oil screw and it s on ya the and stinks to high heaven gearcase is done...

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

I changed the oil as well and 98% sure I did it correct, could be from previous impacts unless I messed up draining and refilling per factory specs minus the Pennzoil 80w-90 marine gear oil I used...I'll drain in the AM and see what I find though. How sure are you it sounds like a pinion gear? I honestly can see why you are saying it just trying to get as much knowledge as I can. Thanks!!!

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

Would it make that noise in neutral tho? That is what my video was, neutral with the throttle forward but not really opening the throttle plates, it got louder with revving.

 

[the machinist]

Re: 1991 Evinrude 60 HP knocking, what did I do!

Sorry, but I can not detect your problem on the video. However have you checked for a loose flywheel?

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

So I was checking it out this morning and I believe the knock is coming from the gear case. I can hear it when I spin the prop. Didn't drain the fluid yet to check for black fluid or metal but I noticed that the port side bolts holding the case are were about to fall off. Are they suppose to have thread lock on them? The asses that did my water pump last year must not have torqued them down right. Any chances you think this will solve my problem?!? I'm going to try it out later in a bucket if I get the chance.

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

Oil is a hair milky but not really that much, with no metal in it. I tightened up those 2 bolts and I am going to fill it up with fresh oil and go from there for now. Thanks for pointing me in the right direction Faztbullet!

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

Ok I believe this is definitely coming from the motor area. Flywheel is on there tight...any other suggestions?

 

[phillnjack2]

Re: 1991 Evinrude 60 HP knocking, what did I do!

it sounds like the top of the motor to me..

never mind the flywheel, check the wires under it to see if its possibly a loose stator or timer base !!!!
the stator can come loose as i found recently on my engine, i was replacing it anyway but was shocked at how loose it had become
due to someone not using stud lock when putting it on before i got the engine.
i would take the flywheel off and check everything under there for tightness.
also if you tun the engine over by hand can you hear a slight knock or clunk from anywhere ?
do make sure the kill switch is away from the controls !!!

the sound you have seems to be a very consistent knock.

are you using the the vro pump to fuel the engine ?
i know your on pre-mix but are you using the fuel side of the pump ?
if so it could be comming from the vro pump but i doubt it.

if you drop the leg you can still start the engine by using a hose pipe connected to the inlet pipe in mid section.
its very easy to take the leg off and takes about 15 mins maximum to do,especialy as youve got bolts that are not frozen.

on the side where the gear cable is there in an R clip, just take the clip off the shaft and push it towards the other side.
before you remove the R clip have a look and youl see the gearshift lever that comes up from the leg.
when you push the lever from right side over to the left it releases a pin from the gear shift selector rod.
Then simply undo all the bolts from the gearbox to mid section and it will come down easy.
Now when the leg comes down be carefull as it sometimes comes down a lot faster than you might think.
Then simply hook up a hose pipe to the pipe in the mid section turn it on and start engine, if no knock then its gearbox proble
i would personaly be looking under the flywheel first though, and then the gearbox as sound can travel to some funny places.

its a shame as in the first vid it sounded realy good and strong.
hopefully its a simple fix for you.


phill

 

[WernerF]

Re: 1991 Evinrude 60 HP knocking, what did I do!

When you apply a load to the idling engine (e.g. shifting in forward gear with the boat lashed to the dock), will the knock become louder?

 

[Theeplaymaker]

Re: 1991 Evinrude 60 HP knocking, what did I do!

It does become louder with increase of the RPM's at idle and when it is in gear or shifting into gear. It really appears to be directly related to engine speed whether in gear or at idle. Same sound knocking just like the video whether in gear or not. I have checked over anything and everything I can get to without pulling the flywheel and it all looks good. Thanks for your help guys. I don't have a flywheel puller so I may just have to pay a shop to see what hey can find for me since I am low on time here the next 2 weeks and the Marine I prefer to use is only 2 weeks out. I appreciate everyones help and if I do continue to try and figure it out I will let you guys know. I believe the under the flywheel suggestion is a good place to start but I just don't have the proper tools or anywhere close to get them to get the job done.

Also I have the oil connection on the VRO pump capped and am using it as the fuel pump.