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Username Post: vibration issue        (Topic#366464)
docjns1 
"2nd Year" Gold Supporting Member
Posts: 216
docjns1
Loc: upstate NY
Reg: 11-12-19
09-20-21 06:33 PM - Post#2827555    

Chasing a vibration for over a year, originally thought driveline related but apparently not so. '65 Impala, 327 4bbl, 3spd Saginaw (no grooves). I feel it come on above 55mph so using 60mph as test/example. To date:
tires/wheels balanced & rotated, new flywheel, pilot bushing, clutch/PP/t-o brng. New driveshaft w/u-joints. Swapped trans with from another car (69 Camaro, same model Saginaw), all with no luck. Co-worker has vibration analyzer app on phone so I make 4 runs, 2 ea. in 2nd & 3rd at 2000 & 2600 rpm's. 3 of 4 return similar result of water pump as likely culprit. Attached is 2600rpm, 3rd gear @ 60 mph(most noticeable). No visible wobble, no thrown belts, no leaks etc. Could a bad fan clutch (5 blade w/clutch) be culprit? Dunno if its working but no issues with overheating, etc.



Attachment: NVH_CALC_S.pdf (244.58 KB) 10 View(s)
Attachment: 3RD_60MPH.pdf (604.61 KB) 9 View(s)

Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif


Edited by docjns1 on 09-20-21 06:34 PM. Reason for edit: No reason given.

 


aghaga 
"4th Year" Silver Supporting Member
Posts: 2331
aghaga
Age: 67
Loc: Altavista, Va.
Reg: 07-05-08
09-20-21 06:56 PM - Post#2827559    
    In response to docjns1

If the vibration is engine speed related take all of the fan belts off and check for looseness in the harmonic balancer. The 327's crank did not have a bolt helping to hold the balancer tight, only a interference fit.



 
bobb 
Super Senior Member
Posts: 5899

Loc: paradise
Reg: 09-05-03
09-21-21 07:31 AM - Post#2827593    
    In response to docjns1

sounds like you may need to pull the rear wheels put it on jackstands and run it. im thinking driveshaft. recently there was another similar post, it was the pinion bearing.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


Edited by bobb on 09-21-21 07:31 AM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 2322

Loc: Lake George, NY
Reg: 11-11-15
09-21-21 08:16 AM - Post#2827597    
    In response to bobb

I ran into this with 65 Impala convertible. During the diagnosis in my shop, I drove with the owner, I kinda knew what was going on. I got in the back seat and it was 90% gone. I weight 225. This obviously changed the drive line angle. So we shimmed the control arms where they mount and this moved the pinion angle of course, using an angle meter we corrected most of it. Try and add weight in the trunk or rear seat passengers, see what happens. This info does not apply if the vibration occurs in neutral.



Edited by Shepherd on 09-21-21 08:18 AM. Reason for edit: No reason given.

 
docjns1 
"2nd Year" Gold Supporting Member
Posts: 216
docjns1
Loc: upstate NY
Reg: 11-12-19
09-21-21 03:44 PM - Post#2827635    
    In response to Shepherd

Thanks for the input. Failed to mention we've also had it in the shop at work and checked drive angles...all within specs and even added adjustable upr rear arms. As I said, I'm surprised I havent nailed it down but this latest scenario with the vibe analyzer app and program from our MOPAR tech service database leads back to engine & more specifically w-pump once we add in the pulley diameters. I think next will be the vibration app with the car sitting still in neutral (and yes, did the whole neutral at speed, clutch depressed, etc. previously). Let's see if theres a difference parked vs. on the road! Hate to keep spending money 'for nothing' although new parts can't hurt, right? Might add the example shown w/driveshaft-tire/wheel 1st order in yellow is the only one returning that while all others follow the engine path

Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif


 
Shepherd 
Frequent Contributor
Posts: 2322

Loc: Lake George, NY
Reg: 11-11-15
09-21-21 04:51 PM - Post#2827644    
    In response to docjns1

Just for fun, add weight like I did, see if anything happens, no cost. Lol



 
paulo57509 
Senior Member
Posts: 531

Loc: CA
Reg: 07-18-00
09-21-21 07:22 PM - Post#2827658    
    In response to docjns1

I had a '74 6-cylinder Camaro that had a vibration ~60-65MPH.

I finally narrowed it down after adding the spare tire to the tire rotation exercise - wobbly rally wheel.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 
docjns1 
"2nd Year" Gold Supporting Member
Posts: 216
docjns1
Loc: upstate NY
Reg: 11-12-19
09-25-21 08:38 AM - Post#2827932    
    In response to paulo57509

Again, thanks for your input...@ 20 gals. no noticeable change w/full tank or near empty gas. I'll probably have the wheels/tires balanced on our newer machine and check any runout along with the other stuff. I'll report back later...

Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif


 


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