Which odometer gear usually fails
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xHeart
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+1tryingbe wrote:Don't reset the trip meter when the car is in motion!
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Golden-German Shepherd | 2021 XC90 T6 INSCRIPTION (Nexa) | 2020 V60CC (Frska) | 2013A XC90 (Lktra)
Past: Golden Retriever | 2001 V70XC | 1997 Volvo 854 | 1989 Volvo 740 GL | 1979 Volvo 240
Golden-German Shepherd | 2021 XC90 T6 INSCRIPTION (Nexa) | 2020 V60CC (Frska) | 2013A XC90 (Lktra)
Past: Golden Retriever | 2001 V70XC | 1997 Volvo 854 | 1989 Volvo 740 GL | 1979 Volvo 240
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cnv
- Posts: 16
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pkc303: you most probably purchased from me : )
I don't know of anyone else here in Hungary manufacturing these parts.
I'm glad you were satisfied with my products.
kaneelschep: I would avoid brass gears... Over time they can slowly chew up plastic parts around them.
(some of my customers running intrument repair shops often fret about odometers previously repaired with brass gears)
Plus, brass is unnecessarily strong for this purpose.
(Actually, my gears made of Delrin are also a little overkill in terms of strength, but at least I can give lifetime warranty on them. Plus, they don't hurt any other parts, as they are self lubricating.)
To answer the first question:
In my experience both gears (the factory originals) break sooner or later.
My customers who only replace one of them (usually the small one) often come back within a year or just a few months, to also replace the large one.
The explanation is simple:
Both the small gear, and the large gear on the pod are molded from similar polyurethane based resin (despite the different colour), which degrades and softens over time (heat and chemical agents like lubricants speed up the process).
The large gear only lasts a little longer, as it's bulkier - but not forever.
So, my bet is to replace both gears the same time, to some good quality plastic gear and pod.
If you intend to use lubricants, it's also not bad to choose gears made of chemically resistant material.
Delrin (a.k.a. POM, polyoxymethylene, acetal) is such material, which is also self lubricant, so you don't even need additional lubrication. Most serious manufacturers use some kind of POM for these gears, for these very reasons.
About the pod: It's better when the pod and its large gear are molded together as one part from the same material, this way there's no chance of failure or breakage.
(I don't say this is better because I manufacture my pods this way - vica versa: I make them this way because it's better.)
I don't know of anyone else here in Hungary manufacturing these parts.
I'm glad you were satisfied with my products.
kaneelschep: I would avoid brass gears... Over time they can slowly chew up plastic parts around them.
(some of my customers running intrument repair shops often fret about odometers previously repaired with brass gears)
Plus, brass is unnecessarily strong for this purpose.
(Actually, my gears made of Delrin are also a little overkill in terms of strength, but at least I can give lifetime warranty on them. Plus, they don't hurt any other parts, as they are self lubricating.)
To answer the first question:
In my experience both gears (the factory originals) break sooner or later.
My customers who only replace one of them (usually the small one) often come back within a year or just a few months, to also replace the large one.
The explanation is simple:
Both the small gear, and the large gear on the pod are molded from similar polyurethane based resin (despite the different colour), which degrades and softens over time (heat and chemical agents like lubricants speed up the process).
The large gear only lasts a little longer, as it's bulkier - but not forever.
So, my bet is to replace both gears the same time, to some good quality plastic gear and pod.
If you intend to use lubricants, it's also not bad to choose gears made of chemically resistant material.
Delrin (a.k.a. POM, polyoxymethylene, acetal) is such material, which is also self lubricant, so you don't even need additional lubrication. Most serious manufacturers use some kind of POM for these gears, for these very reasons.
About the pod: It's better when the pod and its large gear are molded together as one part from the same material, this way there's no chance of failure or breakage.
(I don't say this is better because I manufacture my pods this way - vica versa: I make them this way because it's better.)
Odometer gears for all Volvo models: https://www.odometer.parts/odometer_gears/volvo
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