Overheat issue solved

[Weeb]

@Weeb I have been disconnected for awhile. If you are referring to the exhaust pipe jacket picture above having silicone in it - be careful!. I believe only the MR-1 engines had this. Your 1.8 liter engines do not have that and you may have opened a hole into your boat. Please double check by looking into that area by removing the hatch.

I was told it was extra from manufacturing on here and the boats not taking on water so I think I’m good. Thanks

 

[swatski]

@BKirish Your 1.8s have those silicone ring parts around the exhaust outlets.
(or should I say: "used to have", LOL)

AKA "yamaha hymen" (or sometimes also "exhaust sphincter"). Loosing those is okay. No worries.

https://jetboaters.net/threads/found-this-in-the-exhaust-odd.13067/#post-227374

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[buckbuck]

OK . I misunderstood and didn't realize you were referring to the exhaust port.

 

[BKirish]

What are they filled with?

It appears to be filled with a sealant.

 

[BKirish]

@Weeb I have been disconnected for awhile. If you are referring to the exhaust pipe jacket picture above having silicone in it - be careful!. I believe only the MR-1 engines had this. Your 1.8 liter engines do not have that and you may have opened a hole into your boat. Please double check by looking into that area by removing the hatch.

I figured that they were filled intentionally. I did not remove any of the filler. Thx

 

[BKirish]

Silicone like substance. It's normal.

Hate to tell you, but when you originally pulled the thermostats out, the one that was closed was the good one, the one that was open was probably the bad one. Without getting too complicated, too much water flow sometimes is as bad or worse than not enough water flow.

Yes - the open one was the bad one. The closed one reinstalled on the original overheated motor operated fine with the exhaust thermo sensor from the other motor as well as the motor as a whole. No overheat. I did put 2 new thermostats in just cause as well as I installed a new exhaust thermo sensor. I will be on the water today if wx holds. Thanks

 

[BKirish]

It appears to be filled with a sealant.

And from the response above it appears normal and even perhaps not required, non the less I didn't fuss with it.

 

[BKirish]

On a side note: I have had some time with the removal of a portion of my l4/5 disc to catch up on this forum and really explore the inner workings of the boat! I bough the boat new and really have taken good care (from my perspective) of it. But as things age, things break and this forum and the folks on it have been very helpful. Thanks