GregGreg
Well-Known Member
- Messages
- 23
- Reaction score
- 10
- Points
- 52
- Boat Make
- Yamaha
- Year
- 2017
- Boat Model
- FSH Sport
- Boat Length
- 19
So I removed the entire external jet system including the shaft and impeller. I did not see any cracks or anything unusual. Actually impressed that I didn't. The water is coming from behind those two yellow arrows. The fiberglass is molded in what looks to allow water to drain to the back of the vessel. It is like that under both of those large washer and bolts; either side of the impeller shaft. That's where my leak is. Only leaks under power. Doesn't leak externally with water filled into the bay/hatches. Doesn't leak with the vessel sitting in the water with or without the engine running. Only leaks when throttle is applied to the engine.If you removed the rubber hose in between the yellow arrows you would see the impeller shaft . The area with the red oval has a seal if you have the impeller shaft out you can see it ,its the first area the splines will pass through as you're inserting the shaft. These get damaged if you sucked up a rope and it spools onto the shaft then gets bound up and rubs on that seal . Take a look at that area if you have the jet drive unbolted. In severe cases that fiberglass are has even cracked
View attachment 224508
In the screenshot here. It shows the space between two pieces of fiberglass; located on the stern side of the engine bay wall and is the same on either side of the impeller shaft hose. Water comes from this area. I do not know how to access this area and it may be coming from the cylinder shaped piece of fiberglass on the bottom middle of this screen shot.