knocking sound

We just took our craz out for the first time ever yesterday. We did not go on a water demo and this is the first tow boat we have ever been in. I noticed a rather loud constant knocking while boat it idling in water, very difficult to track he sound down to one paticular spot, I am quite sure it's not from engine. Dealer wants me to bring it in but trying to get input from other owners.
my thoughts are that it is either swim platform or trim trab/ wakeplate, but sound did not change when I stood on swim platform and when I got it home I was shaking trim tab and it seems to have a lot of play and could potentially create the knocking sound with the exaust being right there and potentially shaking it.

Hard to diagnose a noise with out a video.

Does it only do it at idle?
Only at slow speed?
Still there when you speed up?
Does the sounds change as you speed up?
Is it a metal on metal knocking?
High pitched or lower pitched knocking?

If I was to completely guess I would assume something is lose and it's rattling but with out Haring it and a lot of details that's all it is, a guess.

Sorry to hear you have noises on your new ride.
I did get to water test mine but it was a few months before delivery.

Hope it works out as a simple fix

I was in a mojo for a demo that had a knocking sound at idle... Turned out to be the Yeti Tumbler that was in one of the cup holders 😉

Maybe yours is just as simple

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Originally Posted by mmandley

Hard to diagnose a noise with out a video.

Does it only do it at idle?
Only at slow speed?
Still there when you speed up?
Does the sounds change as you speed up?
Is it a metal on metal knocking?
High pitched or lower pitched knocking?

If I was to completely guess I would assume something is lose and it's rattling but with out Haring it and a lot of details that's all it is, a guess.

Sorry to hear you have noises on your new ride.
I did get to water test mine but it was a few months before delivery.

Hope it works out as a simple fix

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It's a low solid sounding knocking most noticeable at idle, started right away as soon as it was started still on trailer, did seem to change the sound when we adjusted trim tab at idle. Just wonding if other people's trim tabs rattle around a lot by hand the pin seems small diameter for holes.

Quote:

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Originally Posted by Woody929

I was in a mojo for a demo that had a knocking sound at idle... Turned out to be the Yeti Tumbler that was in one of the cup holders 

Maybe yours is just as simple

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If the yeti is rattling then it is not full enough!! JoBoo get me a refill!

Our craz has a knock as well. It does it in gear and at idle. The speed never changes. It knocks the same when running the wake plate. It's not the auto flow plates or swim deck.

My dealer came out and heard the knock but didn't seem too concerned. I have been trying to get into the dealer earlier than my scheduled June appointment to get this and a few other issues fixed but they are really dragging their feet.

I was going to pull my floor panels up and look around for anything obvious myself but almost all the bolts that hold the floor down are stripped on my boat. If you find out what it is please keep us updated.

Quote:

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Originally Posted by smileycvc

Our craz has a knock as well. It does it in gear and at idle. The speed never changes. It knocks the same when running the wake plate. It's not the auto flow plates or swim deck.

My dealer came out and heard the knock but didn't seem too concerned. I have been trying to get into the dealer earlier than my scheduled June appointment to get this and a few other issues fixed but they are really dragging their feet.

I was going to pull my floor panels up and look around for anything obvious myself but almost all the bolts that hold the floor down are stripped on my boat. If you find out what it is please keep us updated.

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Will do

When I called my dealer he did not seem to concerned either wondering if it's a model problem

Can you narrow the sound down to an area?

The problem with mine is the knocking seems just as loud no matter where I am it's definitely echoing in hull, it seems just a little louder at swim platform.

Going to get a fake a lake and run it out of water to see if trim tab rattles at idle,

It should be that the autoflow2 plates need a grommet. I know someone that bought the first Craz model in Alabama and he had the exact same issue. It was an easy fix for the dealer. SC knows about this but does not have the available parts to repair so they are doing it as the issue arises. Best of luck to you.


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Quote:

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Originally Posted by deckwork

Will do

When I called my dealer he did not seem to concerned either wondering if it's a model problem

Can you narrow the sound down to an area?

The problem with mine is the knocking seems just as loud no matter where I am it's definitely echoing in hull, it seems just a little louder at swim platform.

Going to get a fake a lake and run it out of water to see if trim tab rattles at idle,

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No we haven't been able to narrow it down. It really echoes thoughout the hull. It sounds like it's rear of the drivers seat. That's why I wanted to pull the floor panels up.

Quote:

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Originally Posted by Connolly_Crew

It should be that the autoflow2 plates need a grommet. I know someone that bought the first Craz model in Alabama and he had the exact same issue. It was an easy fix for the dealer. SC knows about this but does not have the available parts to repair so they are doing it as the issue arises. Best of luck to you.


Sent from my iPhone using Tapatalk

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I checked my plates after talking to you before. It's not the plates. I have gone to the back of the boat and held them in place and it still knocks.

Quote:

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Originally Posted by smileycvc

No we haven't been able to narrow it down. It really echoes thoughout the hull. It sounds like it's rear of the drivers seat. That's why I wanted to pull the floor panels up.



I checked my plates after talking to you before. It's not the plates. I have gone to the back of the boat and held them in place and it still knocks.

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Yes ours sounds just like you are describing, did you by chance hold the trim tab/wakeplate? I tried to wrap tape around the pin but the pin is snug in the piston but loose in the bracket on plate holes