Very high pitched sound with fan clutch - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 07-21-2015, 06:02 AM Thread Starter
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Very high pitched sound with fan clutch

Towing hard, when the engine revs up, the fan clutch is acting strangely.

When the truck unlocks in 6th, or even kicks down to 5th:
1) very high pitched squeal (almost inaudible) and
2) the fan RPMs cycle up and down (1 sec at 3k, then 5 sec at 2.5k).

It is similar to this post:
https://www.thedieselgarage.com/forum...nder-load.html

However, I think it is more fan clutch/bearing/belt related than degass cap leaking. It is very repeatable with the engine RPMs and the fan clutch RPMs. As soon as the tranny locks in 6th again, the sounds immediately stop.

I've posted a video of the problem:
fan clutch wierdness

It's really hard to see and hear what's going on. Turn your volume up really loud. I'm pulling a hill that required me to downshift. As soon as the downshift happens, you can hear the high pitched squeal and then the fan speed cycle up and down.

The dominate sound is the fan speed cycling up and down, but the squeal is there, just so high pitched it might be inaudible to some of you grey beards.

Thanks for the advice!

2005-6L/PSD F-250 Lariat CC/SB/4x4:
- MBRP 4" turbo back, Dieselsite coolant bypass filter, Frantz oil bypass filter, X-monitor, Fluidampr, fuel x-over line, intake elbow, EGR cooler delete, wrapped headers and turbo, ARP studs, OEM gaskets, ported heads and manifolds to match, Hot FICM w/ ID Flash, 08+ tranny pan/filter.

Last edited by pstrang; 07-21-2015 at 06:07 AM.
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post #2 of 15 (permalink) Old 07-21-2015, 04:00 PM
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A lot of things are inaudible to this old fart, but locking up in 6th AND the high pitched sound going away tells me that it is not the fan clutch. That cycles on temperature and not the tranny gear. Have you had the truck scanned?

Dave

2004 Ford F-350 Regular cab with 6.0.
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post #3 of 15 (permalink) Old 07-21-2015, 05:11 PM Thread Starter
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Quote:
Originally Posted by dbennett48 View Post
A lot of things are inaudible to this old fart, but locking up in 6th AND the high pitched sound going away tells me that it is not the fan clutch. That cycles on temperature and not the tranny gear. Have you had the truck scanned?
I have a scanner, no codes related to this. Have you watched/listened to the video? The fan cycles up and down really fast (1s/5s), abnormal it seems? And the high pitched squeal is painfully loud, if you can hear it. My kids complain, "what's that noise Dad?"

It all *seems* to be engine RPM related. There is obviously fan cooling at lower RPMs, but the fan is spinning faster when I downshift.

Thanks!!
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post #4 of 15 (permalink) Old 07-21-2015, 05:20 PM
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And the rpms increase when you downshift. You stated that the codes you see in your scanner are not related to your problem. What are the code numbers?

Dave

2004 Ford F-350 Regular cab with 6.0.
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post #5 of 15 (permalink) Old 07-22-2015, 03:32 AM
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I can't tell what temps are you at?

I had my fan points moved with custom tuning so the pulse is around 210 and lock around 215. It spins around 1600rpm when clutch is pulsed and 3000 rpm when locked at 2k RPM engine speed. The only time the lock struggles is when I have my plow on and RPM drops very low it seems to struggle to lock. My hunch is the clutch fro the plow package locks when the fan is barely spinning from air flow being blocked. I'd guess fan clutch but you may have a bearing going in the tensioner or other idlers. I'd have to imagine that fan spinning at 3000 rpm is drawing 5-6 HP

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post #6 of 15 (permalink) Old 07-22-2015, 04:49 AM Thread Starter
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Quote:
Originally Posted by Weld engineer View Post
I can't tell what temps are you at?
ECT was 210-217 F
EOT was 212-218 F

At 2.5k RPM engine speed, fan cycles between ~2500 (5 s) and then ~3000 (1 s). When Torque converter locks and engine RPMs drop, fan locks solid ~ 1500 when it kicks on, otherwise < 1000 RPMs.

Perhaps the abnormal 5s/1s fan RPMs cycle is my custom tune problem in the PCM. The very high pitched squeal I'm guessing is bearing, clutch, or like you said, tensioner pulley.

Thanks.
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post #7 of 15 (permalink) Old 07-23-2015, 03:30 AM
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From your video, it almost sounds like a dry crank seal sound or some type of bearing noise, really hard to tell without actually being there.

(don't know if this applies to you or not)...in cases of an egr delete, trucks when deleted and the egr valve is also disconnected electrically, the fan won't function properly. Even with a delete you want to keep the egr valve plugged in electrically.

Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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post #8 of 15 (permalink) Old 07-01-2018, 11:46 PM Thread Starter
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Quote:
Originally Posted by harry6.0 View Post
From your video, it almost sounds like a dry crank seal sound or some type of bearing noise, really hard to tell without actually being there.

(don't know if this applies to you or not)...in cases of an egr delete, trucks when deleted and the egr valve is also disconnected electrically, the fan won't function properly. Even with a delete you want to keep the egr valve plugged in electrically.

Harry
Harry, I'm getting ready to tear into my truck to fix a sudden hot-oil no-start problem (no degradation; started perfectly with hot oil one day, then not at all the next; after a long haul though).

While I'm in there, I'd like to fix the subject of this thread. It's been doing this all these years. I did my own EGR delete, the EGR valve is still plugged in, but is welded shut. Do you think that could be the problem?

Thank you!

2005-6L/PSD F-250 Lariat CC/SB/4x4:
- MBRP 4" turbo back, Dieselsite coolant bypass filter, Frantz oil bypass filter, X-monitor, Fluidampr, fuel x-over line, intake elbow, EGR cooler delete, wrapped headers and turbo, ARP studs, OEM gaskets, ported heads and manifolds to match, Hot FICM w/ ID Flash, 08+ tranny pan/filter.
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post #9 of 15 (permalink) Old 07-04-2018, 12:35 AM Thread Starter
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I noticed the video link isn't working anymore, try this one.

Fan clutch constant cycling

2005-6L/PSD F-250 Lariat CC/SB/4x4:
- MBRP 4" turbo back, Dieselsite coolant bypass filter, Frantz oil bypass filter, X-monitor, Fluidampr, fuel x-over line, intake elbow, EGR cooler delete, wrapped headers and turbo, ARP studs, OEM gaskets, ported heads and manifolds to match, Hot FICM w/ ID Flash, 08+ tranny pan/filter.
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post #10 of 15 (permalink) Old 07-29-2018, 11:23 PM
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Sorry for delayed response, just logged in today...

Hot restart issue is usually high pressure oil system related, either an internal leak in the system like hpop fitting or similar. Can also be a faulty icp sensor or ipr valve. If you have a ScanGauge2 or similar, you can monitor icp & ipr as they work hand in hand. If you have high ipr reading while cranking like 75-85% which means the valve is closed trying to build up the high pressure oil, and at the same time your ipr reading is low like 200psi, then that would indicate an internal high pressure oil leak in the system, it takes 500psi just to start the engine. On your 05" yr model the icp sensor is located on top of the passenger side valve cover, try unplugging it when the symptom occurs, this will set it to a default reading and allow it to start if the sensor is the issue, if still won't start, then you likely have a high pressure oil leak as mentioned.

Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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