|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-16-2019, 09:27 AM | #1 |
Senior Member
Join Date: Jan 2019
Location: Florida Panhandle
Posts: 585
|
Resonant Rattle
At about 45 mph I get a low pitch rattle, more like a loud growl, that comes and goes. Sounds like a bad water pump bearing, but a new pump did not fix the problem. Can't find any loose panels or worn suspension joints that could be vibrating. Wondering if it may be timing gear related. Previous owner contracted a high dollar rebuild so suspect a worn engine component is not likely. Engine has about 1500 miles since rebuild. Welcome theories.
|
09-16-2019, 09:31 AM | #2 |
Member
Join Date: Jun 2017
Location: Bismarck, ND
Posts: 84
|
Re: Resonant Rattle
Muffler clamp?
|
Sponsored Links (Register now to hide all advertisements) |
|
09-16-2019, 09:35 AM | #3 | |
Senior Member
Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
|
Re: Resonant Rattle
Quote:
I feel your pain... my car has several of these "sympathetic vibrations". One that I posted about earlier has seemingly gone away on its own (worrying). The others I think are the brake rods, muffler baffles, and choke rod. Maybe this will give you something to work with. |
|
09-16-2019, 09:35 AM | #4 |
Senior Member
Join Date: Jan 2019
Location: Florida Panhandle
Posts: 585
|
Re: Resonant Rattle
|
09-16-2019, 10:49 AM | #5 |
Senior Member
Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,390
|
Re: Resonant Rattle
Ck your hood rods. Are you running engine pans??
Paul in CT |
09-16-2019, 11:17 AM | #6 |
Senior Member
Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 1,045
|
Re: Resonant Rattle
Sponsored Links (Register now to hide all advertisements)
|
09-16-2019, 11:19 AM | #7 |
Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,818
|
Re: Resonant Rattle
Do you have the 2-piece swing-out hood supports on the car?
My Dad has them on his car and if you swing them in all the way, so that the moving part touches the fixed part, they will tap each other and make a lot of noise. Easy to fix, just lift the moving part up 1/2" before closing the hood.
__________________
Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
09-16-2019, 11:20 AM | #8 |
Senior Member
Join Date: May 2010
Location: Fountain Valley, Calif.
Posts: 937
|
Re: Resonant Rattle
If your car has engine pans, a broken attachment ear can vibrate badly and make a lot of noise. Happened on mine...2 were broken.....fixed them and no more noise.
|
09-16-2019, 11:40 AM | #9 |
Member
Join Date: Aug 2018
Posts: 34
|
Re: Resonant Rattle
Hood supports and muffler clamp caused mine!
|
09-16-2019, 11:56 AM | #10 |
Member
Join Date: Jul 2019
Location: Central New Mexico
Posts: 83
|
Re: Resonant Rattle
Does it do it in any other gear or sitting still at a certain RPM?
Last time mine did this it was loose exhaust also, BUT, the exhaust was loose because the bolts holding the motor mount to the passenger frame rail were loose. Well, the one that was left was loose. The noise had me convinced I was going to be putting bearings in the transmission, and I had actually crawled under to check the oil in the trans when I found everything loose. Sent from my E6810 using Tapatalk |
09-16-2019, 05:59 PM | #11 |
Senior Member
Join Date: May 2010
Location: In my garage
Posts: 465
|
Re: Resonant Rattle
My engine pans crack on the drivers side oil pan bolt. It has broken twice in 20 years. What a loud noise it gives off, you can hear me coming from a block away So l always wondered how much flex are these cars are supposed to have
__________________
31 Tudor 66 Bonneville 57 Chevy pickup 27 T roadster pick up |
09-16-2019, 06:15 PM | #12 |
Senior Member
Join Date: Dec 2014
Location: Germantown,TN
Posts: 516
|
Re: Resonant Rattle
My choke rod was vibrating against the throttle rod at 35 and 45 mph and when the engine decelerated during shifting. Noticed a shiny spot on the choke rod. Immediately recognized it be the source of my last annoying rattle.
|
09-16-2019, 07:53 PM | #13 |
Senior Member
|
Re: Resonant Rattle
Sure sounds like what the guys have already said. Get a rubber mallet and lightly hit the hood props, the radiator to dash rods, those engine pans and the windshield frame, and it should show itself.
|
09-17-2019, 08:24 AM | #14 |
Senior Member
Join Date: Jul 2019
Location: Oklahoma City, OK
Posts: 184
|
Re: Resonant Rattle
I have a resonant rattle that comes when I back up into my parking spot. I suspect the brake rods vibrating. I plan "someday" to take some inner-tube strips and use them to pull lightly on the rods and tie them off to the frame. Hopefully I can locate the culprit that way.
|
09-18-2019, 04:24 AM | #15 |
Senior Member
Join Date: May 2010
Location: Gwynn's Island Va
Posts: 1,386
|
Re: Resonant Rattle
Do a bolt check. Fenders,headlight bar,windshield, gas tank clamps,floor boards. If it has a fastner,it could rattle. When rattle starts touch the brake pedal,see if it goes away. Also a click or two on the parking brake.
Wick |
09-18-2019, 04:02 PM | #16 |
Senior Member
Join Date: Apr 2011
Location: New Zealand
Posts: 444
|
Re: Resonant Rattle
A harmonic balancer pulley may solve your problem if it's an engine related vibration or timing gear rattle? As far as I'm concerned it's a miracle device and such a simple solution.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|