Author Topic: Restoring Vintage Shock Absorbers  (Read 491 times)

Online canuck750

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Restoring Vintage Shock Absorbers
« on: March 15, 2019, 09:17:50 PM »
I have a couple sets of Ceriani shock absorbers that are period correct for many Italian motorcycles including my Laverda 750 SF1 and Benelli 650 Tornado to name a few. A couple pairs of these vintage shocks have suffered decades of corrosion to the hard chrome plates shafts. I tried several hard chrome plating shops in town but unfortunately these shops are not set up tp hard chrome the tiny shock absorber shafts, One shop quoted me $200 to set up their tooling and at least $100 to plate each shaft, Yikes!!

A shop foreman suggested I make new stainless steel shafts to match the originals, brilliant!

This is the shape of the original shock shaft after I cleaned the rust off



I was lucky to find 7/16" hard stainless steel rod and cut new sections to length and milled the ends and threaded the tips to match the originals.



I have a professional welder friend willing to TIG weld the stainless shafts to the carbon steel top caps,

I cut the old shafts off the caps, ground off the remnants of the old shaft and then made a jig to hold the new shaft in place to the original cap





Once welded up I powder coated the caps again and these shocks will last a life time



The stainless rod cost me under $15.00 and I used scrap steel to make the jig



It took a couple hours of machining, welding and painting but saved $100's!
1949 Guzzi Airone
1958 Guzzi Cardellino
1972 Guzzi Eldorado
1972 Benelli Enduro
1973 Guzzi V7 Sport
1973 Laverda SF1
1973 Benelli 650S
1974 Guzzi 750S
1975 Moto Morini 3 1/2
1975 Ducati 860 GT
1978 Moto Morini 500
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1973 V7 Sport
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Online oldbike54

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Re: Restoring Vintage Shock Absorbers
« Reply #1 on: March 15, 2019, 11:34:15 PM »
 Very nice work Jim , I am seriously impressed  :bow:

 Dusty
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Offline Knuckle Dragger

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Re: Restoring Vintage Shock Absorbers
« Reply #2 on: March 16, 2019, 12:52:36 AM »
Magnifico!
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Offline Muzz

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Re: Restoring Vintage Shock Absorbers
« Reply #3 on: March 16, 2019, 04:23:33 AM »
I knew a winter project would come along sooner or later. :grin:  Nice work! :thumb:
Muzz. Cristchurch, New Zealand
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Offline Chuck in Indiana

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Re: Restoring Vintage Shock Absorbers
« Reply #4 on: March 16, 2019, 06:19:19 AM »
Quote
It took a couple hours of machining, welding and painting but saved $100's!

 :smiley:
Chuck in (Elwood) Indiana/sometimes SoCal

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Offline cliffrod

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Re: Restoring Vintage Shock Absorbers
« Reply #5 on: March 16, 2019, 09:51:07 AM »
Very, very cool.  Thanks for posting.
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Offline SED

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Re: Restoring Vintage Shock Absorbers
« Reply #6 on: March 16, 2019, 12:26:43 PM »
Nice work - great ideas there.  Thanks!    :thumb:
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Online canuck750

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Re: Restoring Vintage Shock Absorbers
« Reply #7 on: March 16, 2019, 03:34:04 PM »
Finished up the reassembly, Wolfgang Haerter at Columbia Car and Cycle in Naksusp B.C. had the new seal kits

The new stainless shafts are a tiny bit wider than the original so I had to ream out the centre of the cast slider a few thou, it's the part that moves with the shock action.



I filled them with 70cc of 5 weight fluid



And a repro decal to just smarten them up



And the loaner pair (much longer) can go back on the Laverda



Now the Benneli rear end sits like it should and the bike no longer wobbles on the centre stand. :thumb:
1949 Guzzi Airone
1958 Guzzi Cardellino
1972 Guzzi Eldorado
1972 Benelli Enduro
1973 Guzzi V7 Sport
1973 Laverda SF1
1973 Benelli 650S
1974 Guzzi 750S
1975 Moto Morini 3 1/2
1975 Ducati 860 GT
1978 Moto Morini 500
2015 KLR 650
2016 BMW K1600

SOLD
1973 V7 Sport
1975 750 S3
1977 Le Mans
1993 1000

Online jas67

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Re: Restoring Vintage Shock Absorbers
« Reply #8 on: March 16, 2019, 04:54:26 PM »
Wow, nice job!
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Offline huub

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Re: Restoring Vintage Shock Absorbers
« Reply #9 on: March 16, 2019, 05:48:54 PM »
nice job, next time you might try hard chromed shaft, over here it is easily available at 20 euro/meter,
it is more durable than the stainless 

Offline Chuck in Indiana

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Re: Restoring Vintage Shock Absorbers
« Reply #10 on: March 16, 2019, 07:20:01 PM »
nice job, next time you might try hard chromed shaft, over here it is easily available at 20 euro/meter,
it is more durable than the stainless

Maybe so, but I'll bet it would be a bear to turn down and thread.. :smiley:
Chuck in (Elwood) Indiana/sometimes SoCal

02 Scura RC
87 AeroLario
79 G5
95 Skorpion tour
 
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.' - Bertrand Russell

Online John A

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Re: Restoring Vintage Shock Absorbers
« Reply #11 on: March 17, 2019, 08:49:24 AM »
Beauty :thumb:
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Offline Stevex

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Re: Restoring Vintage Shock Absorbers
« Reply #12 on: March 17, 2019, 09:27:53 AM »
Neat  :thumb:
Steve
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Online canuck750

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Re: Restoring Vintage Shock Absorbers
« Reply #13 on: March 17, 2019, 11:01:38 AM »
nice job, next time you might try hard chromed shaft, over here it is easily available at 20 euro/meter,
it is more durable than the stainless

Good tip Huub, I may look for that for a pair of Ikons I have in need of new shafts. Do you know if it is available in metric diameters?
1949 Guzzi Airone
1958 Guzzi Cardellino
1972 Guzzi Eldorado
1972 Benelli Enduro
1973 Guzzi V7 Sport
1973 Laverda SF1
1973 Benelli 650S
1974 Guzzi 750S
1975 Moto Morini 3 1/2
1975 Ducati 860 GT
1978 Moto Morini 500
2015 KLR 650
2016 BMW K1600

SOLD
1973 V7 Sport
1975 750 S3
1977 Le Mans
1993 1000

Online Tom H

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Re: Restoring Vintage Shock Absorbers
« Reply #14 on: March 17, 2019, 11:22:53 AM »
Nice Work!!

For the Ikon's, maybe try Ikon for new shafts rather than making them.

Good luck!
Tom
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Offline huub

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Re: Restoring Vintage Shock Absorbers
« Reply #15 on: March 17, 2019, 11:38:21 AM »
Good tip Huub, I may look for that for a pair of Ikons I have in need of new shafts. Do you know if it is available in metric diameters?

actually , over here ( netherlands) , that is the only sizes available

example;
https://www.indi.nl/nl-nl/p/aandrijftechniek/staal-en-kunststoffen/stafmateriaal-staal/as-materiaal-hardverchroomd/Hardchroom-as-12mm-3m-45836


metric sizes are probably harder to find over there, but it is available
machining it is no problem , if you have to cut threads you are in the base material,  not in the chrome layer
« Last Edit: March 17, 2019, 11:39:35 AM by huub »

Offline Chuck in Indiana

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Re: Restoring Vintage Shock Absorbers
« Reply #16 on: March 17, 2019, 03:03:37 PM »
The only thing I *know* about in the states is Thompson Shafting, used with linear bearings. Good luck turning and threading that..  :grin:
Chuck in (Elwood) Indiana/sometimes SoCal

02 Scura RC
87 AeroLario
79 G5
95 Skorpion tour
 
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.' - Bertrand Russell

Offline Knuckle Dragger

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Re: Restoring Vintage Shock Absorbers
« Reply #17 on: March 18, 2019, 03:25:53 AM »
The only thing I *know* about in the states is Thompson Shafting, used with linear bearings. Good luck turning and threading that..  :grin:

Hello sailor!  In need of a good (Thompson) Shafting are we?  What a classic name.....
Severus bastardis

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