Impact noise on each bump

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Mich7920
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#1 Impact noise on each bump

Post by Mich7920 » Tue Sep 08, 2020 9:14 am

Hi,
I need help please !
Coming back from vacations in Brittany which were the 1st long km after a total restoration of the engine and the front part, I noticed a problem of shock on each bump. Metallic shocks that I could feel under my feet from time to time.
I put the car on the lift and I think it's the box that hits.

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All the brakets and bush are brand new as well as the damping system of the gearbox ( spring and bushs ). The 3rd point is tightened flush as indicated in the manual.
What did I do wrong ?
Thanks for help
Mich
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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mgcjag
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#2 Re: Impact noise on each bump

Post by mgcjag » Tue Sep 08, 2020 9:27 am

Hi Mich....are you missing the lower rubber mount here is a photo of mine the rubber comes through the plate like a large grommet .....sorry photo is dark try to add brightness....Steve
Image

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Steve
1969 S2 2+2 & Building a C type replica

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Mich7920
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#3 Re: Impact noise on each bump

Post by Mich7920 » Tue Sep 08, 2020 9:45 am

Hi Steve,
Sure I didn't do that !!!
Of course my axle hurt the support without this "grommet"
What Is the page of the manual that I miss ?
And what about the very compress spring ? Is it normal ?
Thanks a lot. :bigrin:
Mich
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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mgcjag
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#4 Re: Impact noise on each bump

Post by mgcjag » Tue Sep 08, 2020 11:09 am

Hi Mich..the diagram is from SNGB i think...not sure u missed anything in the service manual as i dont think it shows this mount......spring does look quite compressed...but not sure it thats ok.....have you set the engine stabiliser at rear top of engine to body...Steve
Steve
1969 S2 2+2 & Building a C type replica

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#5 Re: Impact noise on each bump

Post by Mich7920 » Tue Sep 08, 2020 11:25 am

Thanks Steve,
I set the engine stabiliser yes but I'm going to repair what I did wrong, so I'll be obliged to unscrew it and I'l recheck it after.
Thanks for your help.
Mich
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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1954Etype
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#6 Re: Impact noise on each bump

Post by 1954Etype » Tue Sep 08, 2020 2:30 pm

Mich, check your exhaust is clearing the body properly.
Angus 67 FHC 1E33656

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Mich7920
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#7 Re: Impact noise on each bump

Post by Mich7920 » Tue Sep 08, 2020 2:57 pm

I wanted this to be the solution so badly...
But I did the job right.

Image
Image

What I did notice, though:
1 - The engine/gearbox assembly is not in line with the gearbox mount. No more than 5 mm but still.
We can see a trace on the center bush
2- The gearbox case is in contact with the aluminium sheet and wears it out. I can bend it.
3 - The stabiliser's step washer was free ( before disassembling the gearbox support )

The exhaust was my first idea but it's ok. Thanks Angus
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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Moeregaard
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#8 Re: Impact noise on each bump

Post by Moeregaard » Tue Sep 08, 2020 3:39 pm

The sources of mystery clunks and rattles in E-Types are many and can be really frustrating to track down. I always look for the obvious first, such as perished rubber bits and witness marks on adjacent components, but the one that drove me nuts with my first E-Type many years ago was a surprise.

The 1/2" bolt that ties the two pieces of the lower A-arm together, to form the lower damper mount, lives in a relatively hostile environment. The damper mount bushing will often seize itself to the bolt, while a small amount of play will develop between the A-arm pieces, resulting in a clunk that is most noticeable when driving over rough pavement at slower speeds. The bushing is now available, but back in the bad old days of limited parts availability I had to turn a pair from some unknown grade of stainless steel. A new bolt and a liberal application of copper grease made things right again.

Any clunks emanating from the rear transmission mount should be dealt with immediately, because failure of the rubber bobbin down there can put undue strain on the engine stabilizer on the firewall.
Mark (Moe) Shipley
Former owner '66FHC, #1E32208
Former owner '65FHC, #1E30036

Planning on getting E-Type No. 3 as soon as possible....

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positivfoto
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#9 Re: Impact noise on each bump

Post by positivfoto » Fri Sep 18, 2020 12:07 pm

stupid answer but true, you have always check your shock absorbers.

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Mich7920
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#10 Re: Impact noise on each bump

Post by Mich7920 » Fri Sep 18, 2020 1:11 pm

There's no stupid answer of course !
I checked my exhaust, put in line the engine /gearbox, changed the spring and center bush and adjusted carrefully the stabilisater.
Now I wait to make a try on the road.
I'll check the shock absorber if there is still some fault.
Thanks
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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Mich7920
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#11 Re: Impact noise on each bump

Post by Mich7920 » Sun Oct 25, 2020 5:23 pm

I solved my parasitic noises.
- I have refocused the engine and gearbox assembly.
- Bend the protective aluminum sheet that touched the box.
- Correctly adjusted the 3rd support point.
- Even if they didn't really touch each other, I put a bigger gap between the 2 exhaust pipes.
- Tighten the bolts at the head of the shock absorbers that I had left too free.
Happy ! :bouncyyellow:
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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