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Noise when starting Yamaha F300 from cold

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Noise when starting Yamaha F300 from cold

Old 08-03-2019, 08:09 AM
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Default Noise when starting Yamaha F300 from cold

The last two times I have started my 2013 Yamaha F300UCA from cold it has made a noise. It sounds like a belt rubbing up against plastic or something like that (not sure). The noise was pretty loud, much louder then the engine would normally be. Both times I shut the engine off immediately, checked around, and found nothing. I then started it a second time and it purrs like a kitten. What should I check? Inspect the belt for wear? Does that belt need maintenance? All I can find in the service manual is to check/replace every 100 hours. Could it be some corrosion protecting that I have been neglecting? Is there anything else that could make a noise like that? It's very strange since it was only on for a few seconds the first time, and then the noise is just gone and the engine is fine.
Old 08-03-2019, 08:18 AM
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Originally Posted by Jason9876 View Post
The last two times I have started my 2013 Yamaha F300UCA from cold it has made a noise. It sounds like a belt rubbing up against plastic or something like that (not sure). The noise was pretty loud, much louder then the engine would normally be. Both times I shut the engine off immediately, checked around, and found nothing. I then started it a second time and it purrs like a kitten. What should I check? Inspect the belt for wear? Does that belt need maintenance? All I can find in the service manual is to check/replace every 100 hours. Could it be some corrosion protecting that I have been neglecting? Is there anything else that could make a noise like that? It's very strange since it was only on for a few seconds the first time, and then the noise is just gone and the engine is fine.
I would pull the cowling and the flywheel protection.
Inspect the engine for belt dust, rust, plastic dust. (Do not start engine).
If there is excessive dust, you may wish to have the idler pulley and belt checked. Belt should be changed at 1000 hrs.
Most likely it is oil getting to the VCT valve. It will chatter till the oil gets up there.
Old 08-03-2019, 08:22 AM
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Originally Posted by Parker Yacht View Post
Most likely it is oil getting to the VCT valve. It will chatter till the oil gets up there.
Are you saying this is a normal process for the engine or a problem?
Old 08-03-2019, 08:32 AM
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Originally Posted by Parker Yacht View Post
I would pull the cowling and the flywheel protection.
Inspect the engine for belt dust, rust, plastic dust. (Do not start engine).
If there is excessive dust, you may wish to have the idler pulley and belt checked. Belt should be changed at 1000 hrs.
Most likely it is oil getting to the VCT valve. It will chatter till the oil gets up there.
Originally Posted by Jason9876 View Post
Are you saying this is a normal process for the engine or a problem?
IF you have pulled the cowling and find nothing abnormal.
Without hearing it or seeing it, it sounds like the VCT.
It takes a few seconds for the oil to get up there once the engine starts.

Old 01-28-2020, 07:11 PM
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So this is still doing the same thing. I took a video. Does this sound like the VCT valve?


Thanks
Old 01-28-2020, 08:44 PM
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Yes but yours sounds like something is wrong. Both mine rattle for a couple seconds then stop just like that but your sound is way louder and different. Get it checked.
Old 01-29-2020, 02:40 AM
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That does not sound good or normal..
Old 01-29-2020, 03:35 AM
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Holy crap!!

Sounds like the starter is still engaged with the flywheel after the engine has already started. But that's just a wild guess. I'm interested in knowing what you find though

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Old 01-29-2020, 04:31 AM
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It does kinda sound like the engine is driving the starter for a couple seconds. Try greasing the the starter gear and see if it helps.
Old 01-29-2020, 05:04 AM
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i agree it sounds like starter is still engaged. can you tap it with a rubber hammer while that's going on and see if it stops?
Old 01-29-2020, 05:10 AM
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So it just recently started making that noise and you have to ask if that is normal???
have you ever heard an outboard make that noise?
Old 01-29-2020, 06:30 AM
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That is not the normal f300 2 second rattle.
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Old 01-29-2020, 07:51 AM
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I will look at the starter tonight to see if anything looks out of the ordinary. I didn't think that sounded like a starter issue, but maybe not. If it was a starter issue, wouldn't it be consistent? This only happens the first time starting after sitting for a while. After that, it's fine.
Old 01-29-2020, 10:19 AM
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Wow that’s loud. Definitely louder than the 2 second rattle I get as well on initial start up. Does not sound really like the starter staying engage thou but possible.
Old 01-30-2020, 09:49 AM
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I checked the starter last night. Nothing looks out of the ordinary. The gear on the starter seemed to move freely up and down. no metal shavings or anything. I hadn't applied Yamalube Silicone Spray on the flywheel in a while, so I added some. I didn't try and start it yet.

Anyone have any other ideas?
Old 01-30-2020, 10:28 AM
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Untill you start it with the hood off, this thread isn't going anywhere. Maybe one of the cams is frozen and the belt is running over it.
Old 01-30-2020, 10:37 AM
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Originally Posted by Fordy View Post
Untill you start it with the hood off, this thread isn't going anywhere. Maybe one of the cams is frozen and the belt is running over it.
I'm looking for any trouble shooting tips, so thank you. Should I take the flywheel and other cover off to test it?
Old 01-30-2020, 04:53 PM
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Personally I wouldn't start it again until a certified Yamaha mechanic looked at it. That sounded pretty awful!
Old 01-30-2020, 06:07 PM
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No doubt in my mind you've got a problem. Please report back so we can learn what it is.
Old 01-30-2020, 08:58 PM
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Does this motor have that intermediate drive shaft bushing?

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