Oil spray on port side engine

[Amar Nanduri]

Figured it out FINALLY. There was a shearing force on the O ring when bolting the cooler back to the engine that is causing the o ring to tear up. Even a slight twist on the cooler when installing the bolts will tear up the O ring.

O ring is part no 12 and Conector is part no 11

These are the sequence of steps I followed when switching the O rings or bolting the cooler to the engine when you are doing by yourself sleeping down on the floor of the boat and not screwing up.

1. Always make sure the O rings are lubricated when putting them on both sides of the Connector. Put the Connectors first inside the engine block gently without twisting them. They have to fit in properly.
2. Put the oil cooler firmly on the Connectors and do not move the Cooler. Any twisting movement on the oil cooler will break the O ring.
3. Attach the big bolt 9 first between the Connectors and screw it in a bit so that the load of the oil cooler is on this bolt and not on the Connectors.
4. Screw in the second bolt 9.
5. Now that the load is supported on both 9 bolts go ahead and screw in the 10 bolt.
6. Ran both engines for 15 minutes each without any visible sign of oil.

Remember not to twist the oil cooler when screwing in the bolts. Even a slight twist of a few mm will break the O ring. It will not be easy holding it in place when screwing the bolts. I recommend the help of a second person when bolting the oil cooler.


Picture of oil cooler attached for reference

 

[Wr3ckdiver]

Could be residual oil, or maybe a leaking oil pan gasket.... I would clean it all up recheck the level and run it some more to be sure where it is coming from.

 

[Amar Nanduri]

Could be residual oil, or maybe a leaking oil pan gasket.... I would clean it all up recheck the level and run it some more to be sure where it is coming from.

confirmed it is leaking from the O ring cylinder. Took videos every time the issue happened and it is from the same place.

 

[Ronnie]

Glad you figured out what the problem was and how to fix it.

Did you use a torque wrench to tighten down the cooler bolts or just do it by feel?

 

[Amar Nanduri]

Glad you figured out what the problem was and how to fix it.

Did you use a torque wrench to tighten down the cooler bolts or just do it by feel?

I am embarrassed to say @Ronnie that I don't know what a torque wrench is. I tightened the bolts by feel. Now I am confident of fixing this if it ever gives out. I will carry a spare set of bolts and seals in the boat if it is ever required.

 

[Ronnie]

Here are a few pics of a torque wrench I have. You set the ft. Lbs. by dialing in the number with the lower handle, when the head tilts/clicks you have reached your target torque. I don't really trust mine as it seems to overtighten / torque the bolts sometimes. For example, spark plugs, the box Indicates to hand tighten them and add 1/4 a turn, when I use a torque wrench to get to the spec'd torque it is much tighter (by a few rotations) than anything I would have done by hand. So I use it when I have to like reinstalling a head but not on the plugs and I wouldn't trust mine enough to use it on the oil coolers either. I can always make the bolts on the cooler tighter if needed but go to tight and crack the cover puts me in the position of possibly having to spend $700 for a new cooler. Yamaha could have done a lot better by its customers where the oil cooler problems are concerned.

Again congrats one and fixing the problem.

 

[Amar Nanduri]

Here are a few pics of a torque wrench I have. You set the ft. Lbs. by dialing in the number with the lower handle, when the head tilts/clicks you have reached your target torque. I don't really trust mine as it seems to overtighten / torque the bolts sometimes. For example, spark plugs, the box Indicates to hand tighten them and add 1/4 a turn, when I use a torque wrench to get to the spec'd torque it is much tighter (by a few rotations) than anything I would have done by hand. So I use it when I have to like reinstalling a head but not on the plugs and I wouldn't trust mine enough to use it on the oil coolers either. I can always make the bolts on the cooler tighter if needed but go to tight and crack the cover puts me in the position of possibly having to spend $700 for a new cooler. Yamaha could have done a lot better by its customers where the oil cooler problems are concerned.

Again congrats one and fixing the problem.

Thanks for the information @Ronnie much appreciated.