Gear box issue | MotorhomeFun | The Motorhome Support and Social Network

Gear box issue

Jun 26, 2018
60
19
Cambridgeshire
Funster No
54,606
MH
C class
Exp
Newbie
Hi all just put my ducato Autotrail into reverse but didn’t dip the clutch , loud clunk and stalled . Can select all gears still and reversed up little levelling ramps on pitch. However on tick over without clutch pedal depressed quite noticeable nocking noise. Depress clutch no noise and gears can be engaged. What damage do you think I have done and if I get recovery anyone recommend mechanic in Cambridgeshire somewhere near March. Help desperately needed ! Just on long weekend away in Norfolk at mo
 

pappajohn

LIFE MEMBER
Aug 26, 2007
38,114
29,289
Dark side of the moon
Funster No
172
Exp
Since 2005
Possible damage to clutch disc shock springs.
Depressing pedal will stop the disc spinning, release pedal and disc spins again.
It may just be a broken spring rattling but they are captive and shouldn't cause further damage.
My choice would be wait until I got home before investigating/repairing.
 
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OP
Pagen
Jun 26, 2018
60
19
Cambridgeshire
Funster No
54,606
MH
C class
Exp
Newbie
been driving the wife’s automatic all week so pressed the brake pedal and engaged reverse however forgot I was in the manual mo Ho! Take it you think driving it will be ok, need to find someone fairly local who can repair this. If necessary I can get recovered but need to find somewhere to take it to

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Aug 5, 2018
1,569
3,488
Funster No
55,394
MH
a
Would categorically not drive that home or you may risk lunching the gearbox further. Just not worth it.
Could have snapped a layshaft, damaged dual mass, or cracked clutch driven plate. All of which if failed while driving would be sure to cause further damage. AA / RAC to a garage for inspection IMO.
 
Nov 18, 2011
10,744
23,586
Funster No
18,938
If its old stile clutch could be a broken spring or center plate
Bill
 
Oct 16, 2014
731
2,633
Fife, Scotland
Funster No
33,848
MH
Coachbuilt
Exp
Since 2013
How old is it|?
Reason I ask is I had quite an expensive gearbox issue. Van was only just out of warranty, Fiat were really good. They paid for all the major parts, c. £1,200, I paid for labour and sundries, c. £800.

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Aug 5, 2018
1,569
3,488
Funster No
55,394
MH
a
Might be the thrust bearing
Dumping the vehicle into gear without using the clutch and therefore without using the thrust bearing (as this is what operates the clutch) will have had NO effect on the thrust bearing at all.
 
Aug 6, 2013
8,896
8,316
Kendal, Cumbria
Funster No
27,352
MH
A Class
Exp
since 1999
It could simply be that you are anticipating damage and the knock has always been there. Gear clearance can cause a regular tapping (not a serious knock) at idle. It will stop when the clutch is disengaged because the gearbox isn't connected. What you did isn't as dramatic as you perhaps imagine. Reverse is still (in most gearboxes) engaged by dogs or by direct movement of a gear with no synchromesh involved. Damage (if any) would likely be limited to a chipped dog or geartooth the last of which might cause a noise (pretty unlikely until engaged though). Once the gear has engaged the resultant forces are more or less absorbed by the engine/gearbox rubber mountings until the van moves or the engine stalls.

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Last edited:
Dec 12, 2010
3,221
6,805
Cumbria
Funster No
14,651
MH
C Class
Exp
since 2011
I hope your gearbox issue turns out to be nothing serious but just a word of caution, I'm sure I heard somewhere that it's not good practice to reverse onto levelling ramps ?
Something to do with the reverse gear ratio and optimum engine revs/turbo performance that ends up with you having to slip the clutch excessively. I'm sure someone with the appropriate knowledge will be along to confirm or dispel the theory shortly.
 
Feb 22, 2011
4,104
4,600
Newcastle under Lyme
Funster No
15,397
MH
Hymer B544 A Class
Exp
Since 2015
it's not good practice to reverse onto levelling ramps ?
I think your correct, I've seen / smelt smoking clutches a number of times when vehicles have been reversing and manoeuvring up a hill.
It must be something to do with the ratio on reverse gera
 
Sep 6, 2019
103
111
Newcastle Upon Tyne
Funster No
63,854
MH
Autotrail Frontier
Exp
since 2015
Hi all just put my ducato Autotrail into reverse but didn’t dip the clutch , loud clunk and stalled . Can select all gears still and reversed up little levelling ramps on pitch. However on tick over without clutch pedal depressed quite noticeable nocking noise. Depress clutch no noise and gears can be engaged. What damage do you think I have done and if I get recovery anyone recommend mechanic in Cambridgeshire somewhere near March. Help desperately needed ! Just on long weekend away in Norfolk at mo
Is the noise like a 'chattering' then when you dip the clutch it disappears ? If so,that could be the same fault i have on my ducato at the moment,its in the garage at the moment having the gearbox re-furbed ,apparently its the reverse idler gear(the bearing collapses allowing the gear to try & engage) thats what the chattering noise is. Dont know how safe it will be to drive like this.
My MH is just inside the warranty(bought used from a dealer with 45k on the clock).
cost of refurb is about £600-£700 +labour.
hope you get it sorted.
kev

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OP
Pagen
Jun 26, 2018
60
19
Cambridgeshire
Funster No
54,606
MH
C class
Exp
Newbie
Yes, it is a chattering since my thinking I was on the automatic motor and didn’t dip clutch to engage reverse. Stops when I do dip clutch. Can engage all gears but am going to get recovered rather than risk further damage . It’s only done 19 thou but on a 57 plate and sadly no warranty! Really appreciate all help and suggestions on this marvellous site. Could someone set up a ‘go fund me page’ cos I reckon we are going to need it🥴!
 
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