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Suspension problem #548421
16/12/18 09:50 PM
16/12/18 09:50 PM
Joined: Oct 2018
Posts: 23
Derbyshire
D
DeeDee Offline OP
New to Talk Morgan
DeeDee  Offline OP
New to Talk Morgan
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Joined: Oct 2018
Posts: 23
Derbyshire
[url=http://][/url]
Sorry this image is on its side and I have no idea how to turn it through 90 degrees, However this is the drivers side front and the lower spring on the vertical pillar has a 5mm gap above it. Is this normal? The passenger side bottom spring is touching the carrier as I would expect. I only ask as we have a steering wobble at 55mph. Currently she up on our 4 post ramp in the garage so just having a look to see if there`s anything obvious before ringing the dealer as she`s still under warranty.


DeeDee
2017 Sport Ivory 4/4
Re: Suspension problem [Re: DeeDee] #548441
17/12/18 06:48 AM
17/12/18 06:48 AM
Joined: Jan 2013
Posts: 818
UK
BuyBritish Offline
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BuyBritish  Offline
Talk Morgan Regular

Joined: Jan 2013
Posts: 818
UK
Is the 'gap consistent with the opposite side, many of us use the online gomog resource here to help understand Morgan maintenance

http://www.gomog.com/allmorgan/front.html

Picture right way around below
2cscjg2 by Robert & Ali Davies, on Flickr

Here is a video showing the bottom spring in operation IT DOES MOT CARRY THE WEIGHT of the car merely is there to be a reaction to pot holes etc see video



Rob Davies
Morgan 3 Wheeler 1934 MX
Morgan Series 1 1947
Morgan +4 1956 TR4
Morgan +4 2000 T16 Rov
Re: Suspension problem [Re: DeeDee] #548443
17/12/18 07:08 AM
17/12/18 07:08 AM
Joined: Aug 2017
Posts: 270
Bergen, Norway
R
Robbie Mathisen Offline
Learner Plates Off!
Robbie Mathisen  Offline
Learner Plates Off!
R

Joined: Aug 2017
Posts: 270
Bergen, Norway
Ideally, the rebound spring should be unloaded at rest, the top just kissing the axle. So the spring is 5 mm too short, but I am not sure this really matters. However, it should of course be symmetrical, that is the spring on the other side should be the same. One test is to try to twist the spring with your hand. If you cannot do this, the spring is compressed and thus asymmetrical. If you can twist it easily, it is unloaded and the difference might be within the limits of the acceptable. As it is under guarantee, I would have taken it to the dealer for a checkup.
I do not think this is the reason for your wheel wobble. It might be "St. Malvern's dance", a movement inherent of the wheel /suspension geometry of a Mog. They all do that, Sir... At least many, incuding mine. Got better after I balanced the wheels and lubricated the damper blades (which newer cars do not have). So now I can easily live with it, but am planning to install a steering damper.


Robbie the Norseman
2004 V6 Roadster
Sherwood green
Re: Suspension problem [Re: DeeDee] #548445
17/12/18 08:00 AM
17/12/18 08:00 AM
Joined: Aug 2008
Posts: 2,480
Powick
tmg513 Offline
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tmg513  Offline
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Posts: 2,480
Powick
If you put a jack under the bottom cross member on that side does the gap close? I'm perfectly willing to be shot down on this but I'd have thought that with the main spring being under tension it should always press the stub axle down onto the rebound spring.


1972 4/4 2 Seater
Re: Suspension problem [Re: DeeDee] #548453
17/12/18 08:58 AM
17/12/18 08:58 AM
Joined: Feb 2016
Posts: 3,093
East Harling, Norfolk UK
Richard Wood Offline
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Richard Wood  Offline
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Joined: Feb 2016
Posts: 3,093
East Harling, Norfolk UK
It appears that either the rebound or the compression spring above is too short on the offending side. It could also be the latter is too weak. This assumes everything was factory assembled correctly and steering bearings are present and intact.

If the chassis is jacked up the gap will dissapear as load is taken from the compression spring and it extends, not that it will tell you much.

A complete strip down of both sides will allow comparison of all four springs and an answer to the problem.

As I understand it a static gap on the drivers (r/h) side between stub axle and rebound spring will reduce initial roll resistance as the wheel unloads during right hand cornering and free play is taken up. Clearly though there should be no assymetry.

Last edited by Richard Wood; 17/12/18 09:19 AM.

Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Suspension problem [Re: DeeDee] #548456
17/12/18 09:36 AM
17/12/18 09:36 AM
Joined: Apr 2017
Posts: 1,199
Staffordshire
IvorMog Offline
Has a lot to Say!
IvorMog  Offline
Has a lot to Say!

Joined: Apr 2017
Posts: 1,199
Staffordshire
Hi DeeDee,

The perfect setup is for the bottom rebound spring to be just kissing the bottom of the stub axle at rest such that you can just turn the spring by hand. It's tricky to do because of all the slippery grease but if you us a small rag to hold the spring, it can help. It's not always obvious as you can get some binding at the bottom of the spring in the cross head so persevere with trying to move the spring if it does not seem to move easily.

If it still does not move, get someone to sit in the passenger seat and bounce a few times. If the rebound spring length is just a fraction too long the loading of the main spring will just give you a bit of extra clearance and the rebound spring should then be clear to rotate.

The Morgan front suspension has a lot of stiction in the system and I quite often find that when I get out of the car and check underneath, the driver side rebound spring has a few mm of clearance when I've been driving on my own as that is the side that's had more main spring compression and the stiction in the system has not allowed the main spring to settle at the normal ride height.

All I do then is bounce the front end a few times to even up the springs and usually find that the rebound springs are evenly balanced and just kissing the stub axles.

It is not unusual to get that slight mismatch in ride heights with the car in a static situation so bounce it a few times and re-check.

Of course none of what I've said should rule out a thorough check of the front end to make sure there is nothing else going on but a slight mismatch side to side in static condition is nothing to worry about.

BTW, the old set up was for the rebound spring to be in compression. If it is you will never be able to rotate the spring and in that case you could have a problem because to have one spring in compression and one with 5mm free play suggests something is not quite right.

Could just be excessive stiction that needs a good lube or a sagging main spring on that side. If the car is still under warranty and you are new to Morgan suspensions, It's probably not a bad I idea to discuss it with the dealer anyway.

Last edited by IvorMog; 17/12/18 09:43 AM.

Bob

1999 4/4 2 litre Zetec
Re: Suspension problem [Re: IvorMog] #548466
17/12/18 10:30 AM
17/12/18 10:30 AM
Joined: May 2011
Posts: 1,242
Near Windsor Berkshire
R
Rog G Offline
Has a lot to Say!
Rog G  Offline
Has a lot to Say!
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Joined: May 2011
Posts: 1,242
Near Windsor Berkshire
Check the top bolt holding the kingpin into the crosshead has not loosened and allowed the crosshead to spread open slightly. I have seen this in the past.


2013 M3W
1971 4/4 2 Seater
1934 Sports
Re: Suspension problem [Re: DeeDee] #548511
17/12/18 05:39 PM
17/12/18 05:39 PM
Joined: Oct 2018
Posts: 23
Derbyshire
D
DeeDee Offline OP
New to Talk Morgan
DeeDee  Offline OP
New to Talk Morgan
D

Joined: Oct 2018
Posts: 23
Derbyshire
Thank you to everyone for your time and advice.

My other half has said he'll take a further look at the issue at the weekend. It'll give him an excuse to retreat into the garage, fire up the log-burner and wield the tools if necessary whilst I mash the tea and provide the biscuits. Team work wink


DeeDee
2017 Sport Ivory 4/4
Re: Suspension problem [Re: DeeDee] #548517
17/12/18 06:19 PM
17/12/18 06:19 PM
Joined: Aug 2010
Posts: 3,199
Costock, South Nottinghamshire...
Paul F Offline
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Paul F  Offline
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Joined: Aug 2010
Posts: 3,199
Costock, South Nottinghamshire...
Once you have this issue resolved, it is well worth fitting a gaiter to the rebound spring to keep road dirt and grit off your King Pin. It will extend the life of the bushes and King Pins substantially. There is a thread on TM on this. You can make the gaiters out of an off cut of Mohair hood material (as per DaveW), by cutting up an old inner tube or by using a short length of car heater trunking.

There is a page on Morganatica about gaiters - the page includes top and bottom gaiters. The bottom ones are the most important - you will find a design sketch etc there.


Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross
Re: Suspension problem [Re: Paul F] #548518
17/12/18 06:21 PM
17/12/18 06:21 PM
Joined: Oct 2013
Posts: 6,604
Northamptonshire UK
Stringers Best Mate Offline
Talk Morgan Sage
Stringers Best Mate  Offline
Talk Morgan Sage

Joined: Oct 2013
Posts: 6,604
Northamptonshire UK
Originally Posted By Paul F
Once you have this issue resolved, it is well worth fitting a gaiter to the rebound spring to keep road dirt and grit off your King Pin. It will extend the life of the bushes and King Pins substantially. There is a thread on TM on this. You can make the gaiters out of an off cut of Mohair hood material (as per DaveW), by cutting up an old inner tube or by using a short length of car heater trunking.

There is a page on Morganatica about gaiters - the page includes top and bottom gaiters. The bottom ones are the most important - you will find a design sketch etc there.


It's also worth having a butchers here - https://www.wolfperformance.co.uk/rebound-spring-gaiters.html


Steve
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