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Mark Tennison
New User
Username: fixstuff

Post Number: 15
Registered: 11-2020
Posted on Thursday, 04 February, 2021 - 04:05:   Edit PostDelete PostView Post/Check IP

RRCC - So looking at the detail RRMD service history & MoT's the elapsed mile recorder (within the dash speedometer) was working faultlessly however, since being in storage for a few years the mile recorder has stopped working. Its electronic pulse type (no cable) First quick look would indicate everything is original and all connections are correct, before going deeper I thought I'd ask here and hopefully the forums experience will find the shortest route to a fix.
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Omar M. Shams
Grand Master
Username: omar

Post Number: 2114
Registered: 04-2009
Posted on Thursday, 04 February, 2021 - 04:36:   Edit PostDelete PostView Post/Check IP

What year is the car?
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Mark Tennison
New User
Username: fixstuff

Post Number: 16
Registered: 11-2020
Posted on Thursday, 04 February, 2021 - 04:58:   Edit PostDelete PostView Post/Check IP

1979-1981
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Mark Tennison
New User
Username: fixstuff

Post Number: 17
Registered: 11-2020
Posted on Thursday, 04 February, 2021 - 07:04:   Edit PostDelete PostView Post/Check IP

After doing some research looks like plastic cog in speedometer broken is favourite, many for sale on ebay may also be a clue. Will take a look tomorrow.
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Richard Greene
Frequent User
Username: benzjag

Post Number: 233
Registered: 12-2012
Posted on Thursday, 04 February, 2021 - 10:03:   Edit PostDelete PostView Post/Check IP

I have rebuilt several Shadows and Spurs/Spirits up until 1985. Normally, it's a small white gear (pic) whose "teeth" are stripped or the gear slips on the shaft. I did have a 89 Turbo R in which the trip odometer mechanism had broken on one end. I simply super glued it back. I recommend Odometer Gears in Newport News, Va for the gear if you are in the US:

https://www.odometergears.com/products/Rolls+Royce/Jaeger+Speedometer/174

Richard

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AdrianJ
Unregistered guest
Posted From: 195.213.177.14
Posted on Thursday, 04 February, 2021 - 08:06:   Edit PostDelete PostView Post/Check IP

Bowling Ryan in Bolton (UK)can sort that speedo 'cog problem' - a common occurrence, never reset it while on the move.

(Message approved by david_gore)
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Mark Tennison
New User
Username: fixstuff

Post Number: 18
Registered: 11-2020
Posted on Friday, 05 February, 2021 - 04:17:   Edit PostDelete PostView Post/Check IP

Opened the speedometer and found the white drive cog/gear shown previously broken in to 3 bits, now removed waiting new 20x23 cog/gear.
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Robert J. Sprauer
Frequent User
Username: wraithman

Post Number: 673
Registered: 11-2017
Posted on Friday, 05 February, 2021 - 07:21:   Edit PostDelete PostView Post/Check IP

Note: setting the elapsed mileage counter when moving causes drive gear mesh problems. They are most comfortable at rest.
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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 2420
Registered: 09-2004
Posted on Friday, 05 February, 2021 - 19:29:   Edit PostDelete PostView Post/Check IP

Very rewarding to do the repair ones self, common problem with the plastic drive to break after age.
New gears no problem resetting mileage on the move.
3D printed no problem so far on the 968 that i repaired, keep a spare set in case the other car gives up cheap as chips
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Mark Tennison
New User
Username: fixstuff

Post Number: 21
Registered: 11-2020
Posted on Saturday, 13 February, 2021 - 04:32:   Edit PostDelete PostView Post/Check IP

Mine was the cog in 5 bits, order new off internet 18(looks like it was 3D printed), cog needed some minor fettling i.e. ID to small opened up with 600 grit rolled up and boss was to long as could not get C clip on post, again just used flat surface with some 600. Hardest part was removing the bezel but doable just take your time. All back together working perfectly.

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