Significant vibration at 30-35 MPH
Moderators: notoptoy, S Allen, Solex68
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- Roadster Nut
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- Joined: Thu Jul 07, 2016 10:07 pm
- Location: Fair Oaks, CA
Significant vibration at 30-35 MPH
While enjoying a drive today, I slowed to make a left hand turn while double clutching to try and save my 2nd gear downshift syncro, as I accelerated after making the corner, all of a sudden a major vibration presented itself at around 30 MPH. I thought maybe something came loose in the front end suspension, loose lug nuts or broken shock? I immediately pulled over and checked all I could. Nothing loose or hanging, shook all 4 corners with no funny noises. I babied it home at 25, luckily I was only a mile or so from home when this all took place. I'll get under it later to see if i can find anything out. Could the bad syncro have come loose inside the tranny? U-joints? If the car is rolling ie; clutch in or out, in neutral or in gear, it vibrates HARD at 30-35, but goes away above 40 or below 30. Opinions?
67 1600 with a transplanted 68 2L 5 spd and the rear end.
67 1600 with a transplanted 68 2L 5 spd and the rear end.
4th Roadster
Currently 1967 with 2 liter and 5 speed
Currently 1967 with 2 liter and 5 speed
- jrusso07
- Roadsteraholic
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- Location: Penn Yan, NY
- Model: 2000
- Year: High Windshield-68-70
Re: Significant vibration at 30-35 MPH
My guess, a tire defect...a broken band perhaps. Other than that, could be a bad ball joint or A arm spindle bushing.
Joe
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
- redroadster
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Re: Significant vibration at 30-35 MPH
Shakes the whole car sounds like the drive shaft or in drive line loose wheel ....stay low speed really need it on a lift
Datsun dealer tech 76 to 87
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
- Bwk2000
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Re: Significant vibration at 30-35 MPH
All good suggestions above. In addition, I would check the u-joints for a crack (since the vibration just started) and check the trans fluid level. I would then change it and run a magnet through the old fluid and then pour it through a clean shop towel (to catch any brass shavings) - That should be pretty definitive one way or the other.
Kai
Halifax, N.S.
’69 SPL311 Sports 1600
Classic Cars - Because clean fingernails, free weekends, intact knuckles and financial stability are totally overrated.
Halifax, N.S.
’69 SPL311 Sports 1600
Classic Cars - Because clean fingernails, free weekends, intact knuckles and financial stability are totally overrated.
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- Roadster Nut
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Re: Significant vibration at 30-35 MPH
Mystery solved!
The 4 bolts that attach the driveline to the transmission yoke came loose. Not only loose, one was missing and the other three were only finger tight, hanging on by a couple threads each! Yikes!! Fortunately it didn't come apart on the freeway.
For the tech part, you can't really access them from underneath, as they are right above the X in the frame. I went through the top, at the shifter hole. New Grade 8 bolts, lock washers and nuts. Oh yeah, plenty of blue lock tight. It's too tight of a space for a socket and ratchet, gear wrench, or even a boxed end. The only wrench I could make fit was open ended, and my shortest one was a bit too long. So for me it was 1/4 turn, flip the wrench over, another 1/4 turn an so on....
The 4 bolts that attach the driveline to the transmission yoke came loose. Not only loose, one was missing and the other three were only finger tight, hanging on by a couple threads each! Yikes!! Fortunately it didn't come apart on the freeway.
For the tech part, you can't really access them from underneath, as they are right above the X in the frame. I went through the top, at the shifter hole. New Grade 8 bolts, lock washers and nuts. Oh yeah, plenty of blue lock tight. It's too tight of a space for a socket and ratchet, gear wrench, or even a boxed end. The only wrench I could make fit was open ended, and my shortest one was a bit too long. So for me it was 1/4 turn, flip the wrench over, another 1/4 turn an so on....
4th Roadster
Currently 1967 with 2 liter and 5 speed
Currently 1967 with 2 liter and 5 speed
- david premo
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Re: Significant vibration at 30-35 MPH
You probably have the drive shaft out of time if it’s a 5 speed. There are alignment 0, on the shaft and yoke that have to match up or the shaft is out of timing and will vibrate until bolts come loose or something breaks.
Dave
Dave
- redroadster
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Re: Significant vibration at 30-35 MPH
I've had more than a few like this and were thieves trying to make off with it , probably not as so hard to do but they lift with a tow truck
At a KIA dealer I worked briefly they had a methadone addict as a tech that would tear up cars so it would need work he liked to do
At a KIA dealer I worked briefly they had a methadone addict as a tech that would tear up cars so it would need work he liked to do
Datsun dealer tech 76 to 87
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
- jhayden
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Re: Significant vibration at 30-35 MPH
Dave is right on point here (as usual). Many 2000 owners do not realise that the "0" marks to which he is referring are on both fore and aft yokes as well as both ends of the shaft, and all must line up for proper balance.david premo wrote: ↑Sat Jun 03, 2023 6:07 pm You probably have the drive shaft out of time if it’s a 5 speed. There are alignment 0, on the shaft and yoke that have to match up or the shaft is out of timing and will vibrate until bolts come loose or something breaks.
Dave
All that is assuming, of course, that the original shaft is mated to the original yokes. Unless that is absolutely certain, best to have a driveline shop rebalance using today's technology. And, yes, most will require installation of brand new ujoints to do the service. Still cost-effective.
Jon
- Florida Roadster
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Re: Significant vibration at 30-35 MPH
I rebuilt a 4-speed driveshaft and the marks were clearly visible on both ends. See pic. I have a mark on the front yoke of the 5-speed driveshaft but I have no marks anywhere on the driveshaft itself. Are the marks usually always in the same position on the ends of the driveshaft?
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-Jeff-
1967.5 SPL311 Datsun Roadster 1600/2000 (Full Restoration Project)
1970 Triumph GT6+ (Full Restoration Project. Waiting up on the shelf.)
1967.5 SPL311 Datsun Roadster 1600/2000 (Full Restoration Project)
1970 Triumph GT6+ (Full Restoration Project. Waiting up on the shelf.)
- jhayden
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Re: Significant vibration at 30-35 MPH
Probably the most comprehensive explanation you'll find on this topic:
https://www.youtube.com/watch?v=ljAkxZj3i1Q&t=5s
Jon
https://www.youtube.com/watch?v=ljAkxZj3i1Q&t=5s
Jon
- Florida Roadster
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Re: Significant vibration at 30-35 MPH
Thanks Jon. I'll have to do a little paint removal and exploration to find the marks on the driveshaft.jhayden wrote: ↑Sat Jun 03, 2023 7:43 pm Probably the most comprehensive explanation you'll find on this topic:
https://www.youtube.com/watch?v=ljAkxZj3i1Q&t=5s
Jon
I heard KONESHEWA, and that's about all I could understand.
-Jeff-
1967.5 SPL311 Datsun Roadster 1600/2000 (Full Restoration Project)
1970 Triumph GT6+ (Full Restoration Project. Waiting up on the shelf.)
1967.5 SPL311 Datsun Roadster 1600/2000 (Full Restoration Project)
1970 Triumph GT6+ (Full Restoration Project. Waiting up on the shelf.)
- Solex68
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Re: Significant vibration at 30-35 MPH
Wow, What a great YouTuber.jhayden wrote: ↑Sat Jun 03, 2023 7:43 pm Probably the most comprehensive explanation you'll find on this topic:
https://www.youtube.com/watch?v=ljAkxZj3i1Q&t=5s
Jon
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
Laguna Hills, CA
68 2000
Always willing to help another Datsun Roadster owner
Pending installs: All steering components, Stan Stealth Dizzy
Laguna Hills, CA
68 2000
Always willing to help another Datsun Roadster owner
Pending installs: All steering components, Stan Stealth Dizzy
- Gregs672000
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Re: Significant vibration at 30-35 MPH
I can not agree more than that driveshaft should be gone thru by a shop. Pat
- Gregs672000
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Re: Significant vibration at 30-35 MPH
So today I decided to do a brake and clutch fluid swap, and decided that I'd check my drive shaft since I was under there anyway. Took a while to scrape off the "patina" but I eventually found all the alignment marks and... oops, I'm off 45 degrees. So, a big THANK YOU to this post, group and our friends in Japan... drive shaft is now property aligned, and while I was not experiencing any issues, ya never know!
Greg Burrows
'67 2000 #588
Tacoma, WA
'67 2000 #588
Tacoma, WA