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SP vibration

pbrally
Posts: 15
Joined: Fri Mar 04, 2016 8:45 pm
Location: Australia Northern NSW

SP vibration

Post by pbrally » Tue Oct 11, 2016 10:29 pm

I recently had the Armstrong lever arm rear shocks reconditioned in my SP250 Spec C. Took the car for a spirited drive and it was great! Trouble was the drive eventually managed to show up the weakness in gearbox mounts with the drivers side braking and the drive shaft moving across to drivers side but still able to drive to my mechanic,no vibration just the clicking of the shaft as it rotated and wanted to touch the tunnel. I had the mounts replaced and at the same time the uni joints in the drive shaft. The mounts came from Manners. Immediately after replacing parts the car was tested and a bad vibration was now present. The vibration is there when the car is in neutral and when driving. It is there at idle and gets worse from 1500 to 2500 rpm either when stationary (gear not engaged ) or in drive but never goes away. Because it is there when in neutral I have taken the drive shaft out of the equation. My thoughts..... has the vibration always been there and the mounts have amplified it ? Don't think so as the vibration is big and I am sure it would have been noticed before mounts were changed as the car was very smooth. Have the new solid mounts created it? Engine mounts appear to be ok. I am not sure where to go to from here. Any ideas would be much appreciated. Cheers Pete B Australia

simonp
Posts: 349
Joined: Mon Mar 07, 2016 9:59 am
Location: Birmingham

Re: SP vibration

Post by simonp » Wed Oct 12, 2016 3:02 pm

The only vibration issues I have had have been with faulty tyres - Avons and then with a worn propshaft due to not being greased on a regular basis. The propshaft was replaced with a new one and have had no problems since.

SimonP
Daimler SP 250 - "To feel its eager response as you open up is to know a new motoring adventure"(Sales brochure) The adventure continues!

User avatar
Jez
Posts: 56
Joined: Mon Feb 15, 2016 8:00 am

Re: SP vibration

Post by Jez » Wed Oct 12, 2016 6:49 pm

I had a vibration in the same engine rev range when I first got my SP, which was considerably amplified with the hardtop installed, and was quite concerned as to whether it was an engine issue. However, since fitting an overdrive and consequently changing the mounting arrangements for the gearbox it has all but disappeared. I put it down to worn original mounts, but now wonder if it was a similar issue to what you are now having. All I can think of in terms of diagnostics is to try changing to a different type of mount to see if that improves things.

Cheers - Jez
Jez Stow
1960 Daimler Dart
and a few other toys

pbrally
Posts: 15
Joined: Fri Mar 04, 2016 8:45 pm
Location: Australia Northern NSW

Re: SP vibration

Post by pbrally » Wed Oct 12, 2016 8:47 pm

Thanks for taking the time to reply. I am thinking that maybe when the gearbox was supported to remove the old mounts that the gearbox bolts could have been slightly loose and when the new mounts have gone in the box is now sitting in a different position causing the vibration being created when the engine is running. The vibration only started immediately once the mounts were changed. I ordered mounts (which are rubber) from David Manners. Are there different mounts that can be used ? and if so where are they available from? Cheers Peter

dansdaimler
Posts: 155
Joined: Sat Feb 13, 2016 3:18 pm
Location: France (53)/USA (L.A.)

Re: SP vibration

Post by dansdaimler » Wed Oct 12, 2016 9:05 pm

Check the rubber in the vibration damper on the front of the engine, or the cooling fan blades (did one get bent somehow when the gearbox (engine) shifted?
Daniel
1962 Daimler SP250

Josef Eckert
Posts: 65
Joined: Sat Feb 13, 2016 8:13 pm
Location: Königswinter/Germany

Re: SP vibration

Post by Josef Eckert » Wed Oct 12, 2016 9:13 pm

You wrote:
I had the mounts replaced and at the same time the uni joints in the drive shaft.

When the uni joints were replaced. Have you checked to have the markings on the drive shaft correct aligned again, punch dot (arrow) on the one part alignes with the dot (arrow) on the other part of the drive shaft? Otherwise you may have the mentioned vibration.

Cheers,
Josef

Big Col
Posts: 330
Joined: Tue Feb 16, 2016 12:45 pm
Location: Leeds

Re: SP vibration

Post by Big Col » Thu Oct 13, 2016 9:39 pm

If the gear box is standard then the mounts are of one type only.
If it is standard then check the rear casting that carries the output shaft. These have been known to crack or you may have misaligned it while driving with damage.
Colin,
I may be slow but I’m rough as well !

User avatar
Marc Mears
Posts: 84
Joined: Tue Feb 16, 2016 3:53 pm

Re: SP vibration

Post by Marc Mears » Fri Oct 14, 2016 9:13 am

If it was the gear box you many have felt the vibrations through the gear stick before you had the problem?
Sounds more like the prop shaft has been put back together wrongly or it now need to be balanced, or both!
If you cant find anyone to do it – try these guys – they made me a brand new prop for my XK 150 ( everything) and it was about £100
http://www.northwestpropshafts.com/car-and-motorsport

All you need to do is tell them how long you want and they make then it 30 Mins
Daimler Dart. Healey 3000 Mk3. VW T2 Camper. BMW 2002tii. 996 Turbo. BMW Z3M. Hillman Tilly. Rolls Royce 20/25. XK 150 ots .BMW 3.0 CSL 73. Sunbeam Alpine Mk3.Morris 8 Tourer. 97 XK8 Convertible.Alfa Romeo Giulietta. Citroen Mehari

Tony250w
Posts: 16
Joined: Sun Feb 14, 2016 11:54 am
Location: Leicestershire

Re: SP vibration

Post by Tony250w » Fri Oct 14, 2016 9:21 am

It would appear that the fault must lie with the engine, not the transmission, as you say it occurs when idling and stationary and in neutral. You either have a misfire, a cylinder down, or something is out of balance. Hope you find it soon. Tony

dansdaimler
Posts: 155
Joined: Sat Feb 13, 2016 3:18 pm
Location: France (53)/USA (L.A.)

Re: SP vibration

Post by dansdaimler » Fri Oct 14, 2016 12:37 pm

Tony250w wrote:It would appear that the fault must lie with the engine, not the transmission, as you say it occurs when idling and stationary and in neutral. You either have a misfire, a cylinder down, or something is out of balance. Hope you find it soon. Tony
Agreed. And as the gearbox was not removed, then the clutch/flywheel components are likely not to be the cause hence miss fire, cylinder down or one of the rotating parts on the front of the engine.
Daniel
1962 Daimler SP250

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