central52 Posted November 24, 2008 Report Share Posted November 24, 2008 I took my 47 Plymouth out for the weekly exercise run. When I started going in first gear, there was a metallic slapping sound coming from the engine compartment, like the fan was hitting on something, then a whirring sound. Shifted to second, sound went away, then came back. Same when in third gear. Ran fine with and without that sound. Drove around the block, and then went into my driveway, popped the hood with engine running and no slapping and whirring sound. Everything looks o.k. Engine purring nicely. Drove it again, and the slapping and whirring sounds came again, intermittenly. A friend thinks it might be the driveshaft and suggested I jack up the back, put it on blocks and run it in gear to see what's up. And ideas? Thanks, Ed Parauka Quote Link to comment Share on other sites More sharing options...
oldmopar Posted November 24, 2008 Report Share Posted November 24, 2008 Once you have it up and its not running turn the drive shaft and if should feel loose if they need to be replaced. It could be something as simple as the muffler touching the drive shaft However if the boots are damaged (cut torn) they boots should be replaced and you could further inspect the ujoints at that time. Quote Link to comment Share on other sites More sharing options...
brian hood Posted November 24, 2008 Report Share Posted November 24, 2008 If you have a 2pc drive shaft, check the carrier bearing to see if it is loose. Quote Link to comment Share on other sites More sharing options...
Brendan D25 Posted November 24, 2008 Report Share Posted November 24, 2008 Do any 47s have two piece driveshaft? Just curious, Brendan. Quote Link to comment Share on other sites More sharing options...
Normspeed Posted November 25, 2008 Report Share Posted November 25, 2008 Not that I've ever seen. Could also just be something caught on the driveshaft, like a plastic bag. Quote Link to comment Share on other sites More sharing options...
Brendan D25 Posted November 25, 2008 Report Share Posted November 25, 2008 Is it possible that you have something loose in a brake drum? Does the noise change with engine speed or road speed? Quote Link to comment Share on other sites More sharing options...
central52 Posted November 25, 2008 Author Report Share Posted November 25, 2008 Thanks guys for replies. Well, it's a mystery. The next day, I took the car out again to see if it does that funny clanking noise, and, voila, no noise, no nothing. The car ran fine. Ran it a few miles, and still no noise. The only thing I can think of when it did make that noise was that it was a very cold morning. Up to now we've had relatively mild weather here in Connecticut. I'm thinking of the blower motor fan, but then, why would it do it when the car is running and not at idle? Water pump? Checked it, and it's not loose. Something was turning and it was slapping up against it. I'm thinking of putting a tape recorder in the car, and when it happens again (if it does) to record the sound, and take it to my mechanic friend. Ed P. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted November 25, 2008 Report Share Posted November 25, 2008 ah...you just need to upgrade to double weight ball bearings..its all ball bearings today.. Quote Link to comment Share on other sites More sharing options...
rearview Posted November 25, 2008 Report Share Posted November 25, 2008 Parking brake frozen and hanging up? Quote Link to comment Share on other sites More sharing options...
Normspeed Posted November 26, 2008 Report Share Posted November 26, 2008 A while back, MikeMaker had a similar sound in his P15. Turned out to be the vibration damper on the crank pulley had separated and was spinning loose around the pulley. Not all flathead sixes have one but Mike's did. Quote Link to comment Share on other sites More sharing options...
central52 Posted November 26, 2008 Author Report Share Posted November 26, 2008 Normspeed, How can I check to see if I have a vibration damper in my crank pulley? Is it difficult to get at? Now, the clanking sound is gone, so, maybe it's not the damper? If it was loose, wouldn't it continue to clank? Sorry for all the questions. Ed P. Quote Link to comment Share on other sites More sharing options...
Normspeed Posted November 26, 2008 Report Share Posted November 26, 2008 Here's the original thread. Photos and lots of good info from other members. Hope it helps. http://www430.pair.com/p15d24/mopar_forum/showthread.php?p=93757#post93757 Quote Link to comment Share on other sites More sharing options...
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