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Screech and knock....

Terrance

Jet Boat Addict
Messages
53
Reaction score
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97
Location
Porters Lake Nova Scotia Canada
Boat Make
Glastron
Year
2015
Boat Model
GT
Boat Length
19
Hi All. I own a 2015 Glastron GT187. We were out in medium lake chop today with 3/4 throttle and out of nowhere a load screech happened. We were cruising along in 7 meter depth. So no rocks or sucking up anything. I immediately hit the throttle back to nuetral. When I tried to throttle up again, I hear a load knocking sound. Any ideas?
 

genwrx

Jet Boat Junkie
Messages
102
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22
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Location
Houston, Tx
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
21
Man don't know, is the knocking coming from the engine or somewhere else? Engine, pull spark plugs and check compression, any more details you can give us?
 

Terrance

Jet Boat Addict
Messages
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Reaction score
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Location
Porters Lake Nova Scotia Canada
Boat Make
Glastron
Year
2015
Boat Model
GT
Boat Length
19
Thanks for the reply Genwrx.
I recently had a wear ring and impeller replaced. It's hard to tell if the sound is an engine or drive-line noise. Its like it is shuddering. The more I try to power up, the more the knock wants to happen.
I have 138 hours.
 

RiverRat

Jetboaters Admiral
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Location
Waukesha, Wisconsin 53186
Boat Make
Yamaha
Year
2014
Boat Model
AR192
Boat Length
19
Sounds like something in the pump. Did you pull the boat out of the water to take a good look?
 

Murf'n'surf

Jetboaters Fleet Admiral
Staff member
Administrator
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Location
Naples Florida
Boat Make
Yamaha
Year
2005
Boat Model
SX
Boat Length
23
Sounds like the classic rope in the pump. Might have been an anchor line or dock line floating just under the surface and your giant vacuum cleaner found it.
 

Terrance

Jet Boat Addict
Messages
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Reaction score
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Location
Porters Lake Nova Scotia Canada
Boat Make
Glastron
Year
2015
Boat Model
GT
Boat Length
19
Ended up that the splines at the end of the drive shaft were stripped. Dealer said they were damaged by the ingested rock that went through the impeller and wear ring. The odd thing about it, after the new wear ring and impeller install, we ran the boat for 6 hours before the splines issue became an issue????? another repair.
 

Beachbummer

Jetboaters Admiral
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Location
Houston TX
Boat Make
Yamaha
Year
2008
Boat Model
SX
Boat Length
23
Is there a grease point there in your boat? In my seadoo from 1999 there was a zerk fitting to grease the splines but we didn't know so after many hours of no grease the rubber boot broke and later the splines gave.

Not sure how the new motors are, but grease here was very important to keep the shaft and pto splines from having this exact problem.
 

Terrance

Jet Boat Addict
Messages
53
Reaction score
20
Points
97
Location
Porters Lake Nova Scotia Canada
Boat Make
Glastron
Year
2015
Boat Model
GT
Boat Length
19
Is there a grease point there in your boat? In my seadoo from 1999 there was a zerk fitting to grease the splines but we didn't know so after many hours of no grease the rubber boot broke and later the splines gave.

Not sure how the new motors are, but grease here was very important to keep the shaft and pto splines from having this exact problem.
I would bet you hit it right on the head. Thanks
 
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