440 whines at idle
#2521414
07/13/18 12:07 PM
07/13/18 12:07 PM
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Posts: 425 Eastern Ontario
shaker340
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I have a 1973 motorhome 440 with low miles. I opened it up and checked all clearances and all was well within specs.
At idle, it has a whine like a turbine or blower like sound. As soon as its off idle (700 rpm) it goes away. I removed all the belts to confirm its not alternator, water pump or power steering pump.
Anyone have this experience and what was causing it?
Thanks in advance, Mike
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2521421
07/13/18 12:27 PM
07/13/18 12:27 PM
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Joined: Jan 2003
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JohnRR
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You have your idle set at 700RPM , raise it to 800 and see if it goes away ?
It might be the transmission ?
Last edited by JohnRR; 07/13/18 12:29 PM.
running up my post count some more .
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Re: 440 whines at idle
[Re: shaker340]
#2521430
07/13/18 12:52 PM
07/13/18 12:52 PM
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shaker340
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JohnRR thats exactly what I did, set it to 800 and dont really hear it anymore. Transmission could def be a possibility, its an unknown unit I bought many years ago. It does operate and shift normally from idle on upwards. How to test if its the noise?
PCV is new, but I can def look at that. I can try another one.
Good suggestions so far, thanks, keep them coming.
Mike
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: mgoblue9798]
#2521448
07/13/18 01:30 PM
07/13/18 01:30 PM
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shaker340
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It sounds like a pump whine, and I was convinced it was power steering pump until I disconnected it.
If it is the front pump, how long before the trans needs to be pulled?
I do have a second 727 trans but has short tail stock. I should be able to swap that out for the long tail stock?
Mike
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2521464
07/13/18 02:10 PM
07/13/18 02:10 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
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Does the whine go away when you drop in in gear?
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Re: 440 whines at idle
[Re: shaker340]
#2521485
07/13/18 03:07 PM
07/13/18 03:07 PM
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shaker340
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Curb idle at 800 you barely hear the whine, when in gear and rpm drops to 700 you can hear the whine. As you drive away and rpm increases the whine goes away very quickly, I would say by 900 you can't hear it at all.
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2521919
07/14/18 08:01 PM
07/14/18 08:01 PM
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shaker340
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Transman great suggestion i would never thought of that. However it made no difference in park or neutral and part pressure slowly to full pressure while idling at 700 rpm. Transbhas new oil and filter and proper level hot in neutral. So it looks like front pump could be problem?. What about torque convertor could it make a whine at idle and go away as idle increases? Remember the whine happens in gear too.
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2522254
07/15/18 07:48 PM
07/15/18 07:48 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
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There is no throttle pressure in Park and Neutral, try cycling the linkage with the shifter in Drive.
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Re: 440 whines at idle
[Re: shaker340]
#2522341
07/15/18 11:03 PM
07/15/18 11:03 PM
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shaker340
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John i did as you suggested still no difference at any pressure while in drive idling at 700 rpm.
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2522439
07/16/18 09:54 AM
07/16/18 09:54 AM
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Joined: Mar 2007
Posts: 89 Indiana
Mrbill69
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Don't go crazy trying to figure it out until you check one thing. My 73 Winnebego with 440 had a gear drive cam. It would whine at idle but would also whine a little when revved up.
66 satellite conv w/413, cam & headers, 3.55 gears.
89 Dodge w150 4x4 318 Tbi. Opec's friend
72 Imperial coupe
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Re: 440 whines at idle
[Re: Mrbill69]
#2522468
07/16/18 11:02 AM
07/16/18 11:02 AM
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shaker340
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Mrbill69 thanks for your suggestion. I took this motor apart and it has the chain drive.
Does anyone think the distributor could make a noise like this?
Mike
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2522756
07/16/18 08:00 PM
07/16/18 08:00 PM
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Joined: Jan 2003
Posts: 8,390 Highland, MI.
Sunroofcuda
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I have a 1973 motorhome 440 with low miles. I opened it up and checked all clearances and all was well within specs.
At idle, it has a whine like a turbine or blower like sound. As soon as its off idle (700 rpm) it goes away. I removed all the belts to confirm its not alternator, water pump or power steering pump.
Anyone have this experience and what was causing it?
Thanks in advance, Mike Look for a blower up top...
No Man With A Good Car Needs To Be Justified
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Re: 440 whines at idle
[Re: shaker340]
#2522985
07/17/18 10:18 AM
07/17/18 10:18 AM
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Joined: Aug 2004
Posts: 425 Eastern Ontario
shaker340
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Sunroofcuda, it would be awesome if it did have a blower on top lol.
EV2Bird, I can double check for vacuum leak, but it runs very well and have no reason to suspect a leak.
I keep thinking the Distributor, as the sound is at the front of the motor. I don't have a second one to swap out, and tried a little wd40 on upper bushing area, no change. I will take it out and see if there is anything I can do to lubricate it to see if its the cause of the whine.
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: 440 whines at idle
[Re: shaker340]
#2525761
07/23/18 10:20 AM
07/23/18 10:20 AM
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Joined: Aug 2004
Posts: 425 Eastern Ontario
shaker340
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Appears to be coming from the carb. New Eddy 800 with spacer, new gaskets and bolts are tight. As you shut it down the whine goes down in pitch, so its more like a whistle is what we are hearing.
Thoughts?
2008 Challenger SRT8 1940 Chrysler Royal coupe
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