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BavWilly
Member Joined: 15 June 2022 Location: Quebec Status: Offline Points: 104 |
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Posted: 20 June 2022 at 7:34am |
Hello,
As I mentioned in my introduction, I recently got myself into the Jeep world, buying a “restored” CJ2a 1948. So, here’s my first miracle. The car produces a weird noise in certain situations. Shifting from 2nd to 3rd at around 30ish mph it starts to vibrate (you feel it wenn you sit on the passenger side with your feet on the floor board). It’s over when you get closer to 40mph. I checked for all kind of loose parts (brake lines, muffler …) but couldn’t find anything. It seems also to be much stronger when the gears are not in mesh (not pulling nor pushing). It sounds like a really load vibration sound coming more from the rear … but it’s difficult to locate.in particular since there is no sound at all at low speeds. Any ideas? I know, “weird noise” questions are always difficult to tackle, but it’s maybe a common thing and easy to locate Thanks Klaus
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Jeff J
Member Joined: 12 Mar. 2018 Location: USA Status: Offline Points: 439 |
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The easiest thing to do if you suspect the rear end is pull the cover and check the fluid for metal and do a visual of what can be seen.
The last strange noise I had trouble locating, I blocked up all four corners of the vehicle and found someone to “drive” it while I crawled around underneath with a stethoscope keeping a good distance from anything spinning. In my case I was thinking rear wheel bearing but couldn’t tell which side. The stethoscope confirmed it on the right side. A long screwdriver can be used the same way but I do not recommend it in tight places around moving parts.
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Oilleaker1
Member Joined: 06 Sep. 2011 Location: Black Hills, SD Status: Offline Points: 4412 |
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Check the "clocking" of your driveshafts. I went through this. My u-joints all lined up so I dismissed that. I was wrong. The "ears" that hold the u-joints on either side of the slider in your shaft must be the same or in plane or it will vibrate and drive you nuts.
Easy to check. If they are 90 degrees from one another, the slide the shaft apart and line them up. May not be your problem, but it's one thing to check, Oilly
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Green Disease, Jeeps, Old Iron!
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BavWilly
Member Joined: 15 June 2022 Location: Quebec Status: Offline Points: 104 |
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Sounds interesting, Oilly. But not sure I fully grasp it. Would you have a picture ….?
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BavWilly
Member Joined: 15 June 2022 Location: Quebec Status: Offline Points: 104 |
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Oilly,
Just checked both shafts. Both, rear and front drive shafts the two U-ends are definitely not positioned at 90 decrease …. Should they be? If yes, is there an easy fix to that? Sorry, probably a stupid question but I’m more a motorcycle guy … Thanks Klaus
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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This driveshaft is in correct phase:
This one is 90 degrees out of phase: |
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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muley
Member Joined: 25 Jan. 2021 Location: idaho Status: Offline Points: 821 |
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The man from Kansas beat me..
Edited by muley - 20 June 2022 at 9:19am |
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Joined Jan-8 2015
I never met a mule I didn't like! OD Mule 01-52 M38 Big Red 19fiddy CJ3A salad |
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jeepsterjim
Member Joined: 13 July 2011 Location: lincoln, ca Status: Offline Points: 1283 |
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Noticed the name you use in here being, KLAUS....by chance, is that from the Canadian pop rock group Klaus? A little known great band.
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Jim
CJ-2A - 81299 |
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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The u-joint in either end of the driveshafts could be a cause for vibration at certain speeds. A worn u-joint or one that is binding will do that. A check for looseness or binding is best done with the driveshaft out of the jeep. The u-joint should move smoothly in the yoke with no catch. Do not make the common mistake of over tightening the u-bolts that hold the u-joint in the axle yokes or the front transfer case yoke. This can distort the u-joint bearing cap and caused binding. Use new lock washers under the u-bolt nuts and let them to the work of securing the nut without over tightening the nut.
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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BavWilly
Member Joined: 15 June 2022 Location: Quebec Status: Offline Points: 104 |
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Alright … that could be the issue. They are not aligned like on the phone. How can I correct this?
… and no, no Canadian pop group member
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jeepsterjim
Member Joined: 13 July 2011 Location: lincoln, ca Status: Offline Points: 1283 |
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OK, many of their songs sound like the beatles. People thought they were but under a different name. I was just curious.
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Jim
CJ-2A - 81299 |
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bight
Member Sponsor Member x 2 Joined: 20 Aug. 2020 Location: mid coast maine Status: Offline Points: 1679 |
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lots of good videos on youtube regarding this. look for driveshaft phasing and driveshaft clocking.
Edited by bight - 20 June 2022 at 10:21am |
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CJ-2A 72586 tan (stock)
CJ-2A 197624 green (resto-mod) the wife abides (def: to bear patiently; TOLERATE) |
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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The driveshaft slip yoke will have to be removed from the other end (spline end) and reinstalled with the correct phasing. It can be done with half of the driveshaft still in the jeep. The slip yoke and u-joint needs to be removed by carefully removing the dust cap on the end of the slip yoke. On older style slip yokes, usually there are small tabs that bend over the end of the slip yoke that need to be straightened. On newer style drivehafts, the cap unscrews from the body of the slip yoke. If it is the rear driveshaft that needs rephasing, it is probably easier to remove the u-bolts at the rear axle yoke and remove the dust cap, rather than disconnect the end at the transfer case. Regardless of how you remove one end, the dust cap is disconnected from the slip yoke and the slip yoke just slides off the driveshaft spline. Align the driveshaft in correct phase and slide the slip yoke back onto the spline. Re-install the dust cap. Check both front and rear shafts for correct alignment and roadtest. It wouldn't hurt to give each grease zerk on the u-joints a shot of grease and also the zerk on the slip yoke. Hopefully that will correct your vibration.
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4904 |
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Klaus,
You have to disconnect the drive shaft, slide it apart at the slip joint, and reassemble in correct phase. There is a dust cap on the slip joint that has to be disconnected before the shaft will slide out of the joint. There are different attachments for the dust cap, but some of them have tabs you can bend out of the way with a screw driver. Since you have to drop the driveshaft and disassemble it anyway now is the time to replace the U joints with new ones. They don't cost much. I would also replace the felt seal under the dust cap. I found a thread on this forum pertaining to this issue and it even has a link to a good YouTube video. Edited by Oldpappy - 20 June 2022 at 10:31am |
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If you can't get there in a Jeep you don't need to be there!
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Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4904 |
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Looks like Kansas types faster than I do
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If you can't get there in a Jeep you don't need to be there!
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berettajeep
Member Sponsor Member Joined: 03 Feb. 2009 Location: Astoria OR Status: Offline Points: 4304 |
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I say remove the driveshaft and while there replace the u-joints or just check condition.
I just rebuilt a set of propeller shafts for my '47 and they had arrows stamped on them. |
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BavWilly
Member Joined: 15 June 2022 Location: Quebec Status: Offline Points: 104 |
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Thanks guys. You’re amazing
I will open the U-bolts on both (front and rear) shafts and align the ends. Will report back after the road test. Later Klaus
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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Some do and most don't. The driveshaft in the picture has been repaired at some point in it's life; that isn't a factory weld. That picture is a good illustration of the tab style dust cap. Edited by SE Kansas 46 CJ-2A - 20 June 2022 at 12:48pm |
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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