2006 DF115 Stuck valves?

[runninfarmer]

Hi, I recently purchased a 2006 DF115 for a good price but in non-running condition. I’ve tested compression and it’s zero on all cylinders. I know the PO said the guy that sold it to him said it died one day and it ended up sitting for 3 years or so.

I believe valves are maybe stuck open? If so what’s the best plan of attack? I haven’t tried to start it, I’ve just sprayed fogging oil and Seafoam Deep Creep in the cylinders and have been working pistons back and forth. That doesn’t seem to be working. I haven’t tried soaking with motor tilted up yet though. Should I try that and is there a stronger solvent that’d work better?

Thanks!

 

[racerone]

Remove valve cover and see if valves are moving.

 

[Mc Tool]

As above but also pay attention to the valve clearances. There is a chance that this motor has a bunch of bent valves .
Its unlikely ( not impossible ) that each cyl has a ( corrosion ) stuck valve . The fact that it "died one day " and the no compression makes me wonder if the cam timing is still correct
If the valves are bent there will be way to much valve clearance .
If the valves are indeed corrosion stuck take the head off and fix them properly . I know you can squirt WD40 in there and hammers and levers can free them up but unless your real good at long distance swimming do it right.

 

[Lou C]

Or it could be a broken overhead cam belt drive. That could also cause bent valves….

 

[runninfarmer]

That's what I'm afraid of, is a bunch of bent valves. I've got the manual coming so I'll get to work on removing the valve cover. I've worked on a lot of evinrudes, but this is my first 4 stroke outboard. What do you recommend for valve compression tool if push comes to shove?

 

[racerone]

Do the investigating first.-----Worry about special tools later.

 

[Mc Tool]

Or it could be a broken overhead cam belt drive. That could also cause bent valves….

These boys have a cam chain not a belt , .........but yeah, same thing painted a different colour

 

[racerone]

And the timing chain is underneath the block.-----Lot of work to replace it.

 

[Mc Tool]

I have been looking for such a motor .....one that comes cheap because it needs work ..........work that I can do .
My plan is to get a carbed 4 stroke about 100 - 115hp with high hrs on it and give it rings and bearings , do the head , chuck in seals and gaskets , do the gearbox and it will see me out . ........thats the plan .
Good on you for having a go , I look forward to seeing how you get on .

 

[Mc Tool]

And the timing chain is underneath the block.-----Lot of work to replace it.

Yeah , that would be bloody right , I mean why would you stick it on the top where its easy to get at ,

 

[99yam40]

have you looked into the cylinders when you had the plugs out?

 

[runninfarmer]

What I could see looked ok, but it's difficult with the recessed plug holes. I'll try to get the valve cover off tonight or tomorrow and post an update. It's a freshwater motor in pretty great shape so I'd love to be able to get it going again.

 

[99yam40]

bore scope would be a good tool to look in the cylinders.
Should see if pistons hit the valves

 

[racerone]

Many folks think that these big 4 stroke motors were not designed to be repaired after major breakdown.----If you can do the work yourself there is a possibility it can be done.

 

[runninfarmer]

I haven’t removed valve cover but I did boroscope the cylinders. They look ok to me, there appears to be a significant amount of carbon on pistons and some on valves, but I’m unable to see if they hit the pistons, i can see the valves moving but not sure if they’re sealing. Here’s screenshots from my phone:

 

[99yam40]

good news so far.
did cylinder walls look OK
now pull the valve covers and check valve clearances, maybe too tight .
or if bent too loose., I cannot think of much that would cause all cylinders to have low compression.
if valves are good, all rings stuck maybe

that one 5375 pic bottom right looks like something wrong on edge of piston/cylinder

 

[runninfarmer]

My boroscope is cheap, lol, so not the best, but the cylinders looked smooth. I didn't see any aluminum transfer. I was initially concerned about that piston as well, but I believe it's just the fogging oil I used pooling there. I think the camera is tilted in that orientation.

 

[racerone]

See post #2 -----The zero compression indicates valve issues in my opinion.

 

[99yam40]

if the pistons did not hit all of the valves to bend them, then it could be the cam timing has jumped and did not harm the valves.
just need to get it back into correct timing

 

[racerone]

When these motors hit something ( full throttle ) they might experience a " dynamic halt "-----Crankshaft stops but camshafts want to keep going.----Timing chain jumps on the sprockets.