first outing and find birds in engine
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=7040
Printed Date: June-25-2024 at 8:15pm
Topic: first outing and find birds in engine
Posted By: David F
Subject: first outing and find birds in engine
Date Posted: June-11-2007 at 9:27am
Well, after carefully winterizing a perfectly running (and quiet) engine last fall, I awaken it to find a nest of birds settled in. 30 seconds after starting her up (yes in the lake) for the first time, a failing bearing type squeal set in. Other than being noisey, it did not ruin our day, but I kept a close eye on the gauges...everything stayed normal.
My immediate thought was the raw water pump (that spent the winter on a warm shelf). So when I returned home yesterday evening, I pull the pump and tore it down. To my surprise, the bearing rotated freely and did not seem to drag or have any axial or radial play. Hmmm, maybe the noise is the circulation pump or alternator. Something I will check out this evening. Or, maybe the raw water pump bearing will squeal even though it "feels" fine.
Any thoughts?
PS: The noise is not a belt noise.
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Replies:
Posted By: TRBenj
Date Posted: June-11-2007 at 9:34am
Did the RWP alignment look ok? Maybe if it was a cocked a little, it would cause some uneven load on the bearing. I assume you checked the belt tension (both belts)?
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Posted By: M3Fan
Date Posted: June-11-2007 at 10:21am
Have you dialed in the general location of the noise?
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2000 SN GT40 w/99 Graphics/Gel
2016 SN 200 OB 5.3L DI
https://forum.fifteenoff.com
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Posted By: David F
Date Posted: June-11-2007 at 10:28am
No, the pump alignment was good and the belt was tight enough. Like I said, it was not a belt noise.
Without a screwdriver or other listening device, I could only listen for the location of the noise and I thought it was the raw water pump, but noise location can be deceiving.
This evening, I am going to fire the engine up without the Raw water pump installed and see if the noise is gone.
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Posted By: woodyelc
Date Posted: June-11-2007 at 4:10pm
SOUNDS LIKE DRY PACKING IN THE STUFFING BOX, CHANGE IT OUT AND THE NOISE SHOULD GO AWAY
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woodyelc
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Posted By: David F
Date Posted: June-11-2007 at 4:25pm
Nope, no way. If that were the case, noise would not be present in neutral...it is.
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Posted By: Tim D
Date Posted: June-11-2007 at 5:50pm
Alternator bearing?
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Tim D
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Posted By: David F
Date Posted: June-12-2007 at 8:21am
Yep, very well could be. I did not get a chance to work on it last night. The raw water pump just spins too well. I am leaning toward the alternator. I may be able to tell just by spinning by hand. I let you know what I find.
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Posted By: JoeinNY
Date Posted: June-12-2007 at 8:47am
Don't be surprised if you cant tell its the alternator just by spinning it by hand, I just pulled one last night thats squealing at low rpms and seizing and slipping at high rpms and you would never know it spin it by hand.
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http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001
1967 Mustang 302 "Decoy"
http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video
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Posted By: David F
Date Posted: June-12-2007 at 9:00am
I don't doubt that at all. Hopefully mine is obvious once I zero in on it. Now, I just need to find the time.
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Posted By: Barracuda
Date Posted: June-13-2007 at 8:10am
David- this may sounds kinda funny, but I've used the stethascope method to locate pesky noises before. You can improvise one with a piece of hose and just hold it up to your ear. Then take the other end around all the areas you suspect- may help pinpoint where the noise is orignating from.
Good luck
-Brad
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Former:
http://www.correctcraftfan.com/diaries/details.asp?ID=759" rel="nofollow - '86 Nautique
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Posted By: David F
Date Posted: June-13-2007 at 9:14am
Yep, that method works well and I already have an automotive stethascope. Still have not investigated further. If the noise is still present with the raw water pump removed I will use the stethascope to pinpoint the location.
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Posted By: David F
Date Posted: August-14-2007 at 11:43am
Well, it only took me 2 months to find the time and clear weather to work on the boat again. Also, because we wanted to use it. Anyway, I ran the engine with the raw water pump removed and everything was quiet. What I did notice was that there was an excess amount of belt dust on the engine and bilge. So, I inspected the belt and it looke a bit worse for wear, but not terrible. I reassembled the raw water pump and bolted it on. Presto, the noise was gone.
My theory is that the belt must have rolled over in the pulley grove. Used the boat for a couple of hours without any unusual noise. Just wanted to put an ending to the thread.
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