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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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i noticed a difference in wheel base on my '89 +4 ( M16 ) but , as far i can see, all seems OK , nothing loose or bend , all in place as should be.
Now i wonder if the centering bolt in the leafs ( 5 leafs here) is indeed in the center between the spring's bolt holes ? And are the bolt holes the same both sides , so that a spring can be mounted wrong ( front/rear) which results that the centering bolt is not in the same position left and right ?
Many thanks for info !
2004 GTN #5 sold
1989 Plus 4
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Joined: Jun 2015
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
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Could also be the front crosshead out of kilter? Guess you will be taking some reference measurements to identifiable points on the chassis to confirm where the problem lies.
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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thanks Doug for reply .
We see it clear : left rear wheel is more up front then the right one.
I measure almost 10 mm.
At the base plate of the leafs i measure around 5 mm difference... as if that centering bolt ( seems intact , no damage ) is 5 mm more up front compared the right side.
2004 GTN #5 sold
1989 Plus 4
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Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
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i noticed a difference in wheel base on my '89 +4 ( M16 ) but , as far i can see, all seems OK , nothing loose or bend , all in place as should be.
Now i wonder if the centering bolt in the leafs ( 5 leafs here) is indeed in the center between the spring's bolt holes ? And are the bolt holes the same both sides , so that a spring can be mounted wrong ( front/rear) which results that the centering bolt is not in the same position left and right ?
Many thanks for info !
The locating pin is offset not on centre
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: Nov 2014
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OP
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thanks Simon !
that can explain the difference i have.... the right side leaf spring must be installed ( PO ? factory ?? ) the wrong way.
At least what i suppose, as the right rear wheel is much better in center fender.
PS strange , i searched some topics about installing leaf springs , but never seen mentioned that the locating pin is off center ... so those springs do have a mounting direction. Perhaps it is labeled on new ones ?
2004 GTN #5 sold
1989 Plus 4
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Joined: Nov 2018
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Talk Morgan Sage
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Talk Morgan Sage
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I think if it's between 5 and 10 mm difference it's not that a spring has been fitted wrong. If you have a look at the photo below there is far more than 10mm difference. Personally I don't think it would be possible to successfully mount the axle if one spring was reversed? The top spring is the newer 4 leaf rear. When fitted to my '72 4/4 it re- centered the wheel perfectly in the arch - moving the axle back about 25mm. ![[Linked Image]](https://tm-img.com/images/2021/09/07/uj4fEBuGk0v8O1mGXVPbYBEWfrO7_fTzRGZVC0E8Icu-tkHWK0hmSwnHE1rSE_kua3IC0nEXJVcbmaimoixoztDGToTD3yAwtiD6zLly_oysi2XBhqVhjynAuer0K_i-ZKADQPD2-LP-tLWB5S3It7hySXO5zTbqMt8BX0naIuMzDpIYFixkLbfgHZ98uNEx8uj24xwM.md.jpg)
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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TBM , i can be that the difference with older versions is greater , indeed perhaps to get the wheels better centered in the arch at some year in the past .
That is a '72 , mine a '89.
Now if those more recent springs only differ due 5 ? mm offset of the locating pin , i think it is possible to mount them ( one ) wrong ?
PS i also checked the rear spring shackles , no play and both at the same angle ( no length difference )
Last edited by belgiumbarry; 07/09/21 01:27 PM.
2004 GTN #5 sold
1989 Plus 4
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Joined: Nov 2018
Posts: 6,676 Likes: 441
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,676 Likes: 441 |
TBM , i can be that the difference with older versions is greater , indeed perhaps to get the wheels better centered in the arch at some year in the past .
That is a '72 , mine a '89.
Now if those more recent springs only differ due 5 ? mm offset of the locating pin , i think it is possible to mount them ( one ) wrong ?
PS i also checked the rear spring shackles , no play and both at the same angle ( no length difference )
Possibly - the top springs are a generic 4 leafs that fit 1969 up to (not including) the CX version. However I remember when I fitted them it was very obvious which way they went - there was a significant difference in the distance between pin and eye either side.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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as the car is sagging on his springs too i think it's not worth the work involved to change that spring in direction....so i asked price at our Morgan dealer for 2 new springs and option install at the shop. I could do it myself.... but perhaps they have the "routine/special tools " and can do it for a fair price.
2004 GTN #5 sold
1989 Plus 4
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Joined: Nov 2018
Posts: 6,676 Likes: 441
Talk Morgan Sage
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Talk Morgan Sage
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as the car is sagging on his springs too i think it's not worth the work involved to change that spring in direction....so i asked price at our Morgan dealer for 2 new springs and option install at the shop. I could do it myself.... but perhaps they have the "routine/special tools " and can do it for a fair price.
It is a fairly straight forward job, and easily done by a competant home mechanic. Does takes a failry long time, which may influence the price from the Morgn dealer. Parts cost me about £350 for the springs, about £60 for new U bolts, and £30 for new bolts and spacers.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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