Oakmaster Posted January 20, 2015 Share Posted January 20, 2015 Anybody advise me as to where I can get a new speed sensor for my GKN Part number seems to be 119509/00/00 Quote Link to comment Share on other sites More sharing options...
JeffR Posted January 20, 2015 Share Posted January 20, 2015 If you have very deep pockets, try Devon 4x4... Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 20, 2015 Share Posted January 20, 2015 Devon 4x4 have them for £108 or £166 depending on the age of sensor (just looks like different connectors) Links here: http://www.devon4x4.com/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=2114&category_id=63&option=com_virtuemart&Itemid=14 http://www.devon4x4.com/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=2102&category_id=63&option=com_virtuemart&Itemid=14 However, its supposed to be the same as this part from RS Components at £36 http://uk.rs-online.com/web/p/magnetic-pickups/0285756/?searchTerm=285-756&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B337D5B5C732D2F255C2E2C5D5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3238352D37353626 I haven't done this on mine, but will look into it if I ever need a new sensor for it. Bit more info and original source here http://forum.lro.com/viewtopic.php?f=18&t=72681. I would imagine it's just the connectors/wiring that might need adapting to get everything to fit, but it would only be joining two wires. Quote Link to comment Share on other sites More sharing options...
Oakmaster Posted January 21, 2015 Author Share Posted January 21, 2015 Thanks reb78 - that is really useful information - I shall read it again (carefully) but it isn't immediately clear how compatible the RS (we have an account - they always have everything at a cost) is I did think that there would be a cheaper alternative What would be great is if there was somebody on here who had done it - I notice that our moderator Western Ralph is mentioned in the LRO forum thanks Quote Link to comment Share on other sites More sharing options...
western Posted January 21, 2015 Share Posted January 21, 2015 Yep, I go on LRO as well, still using the gkn speed sensor at present time Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 21, 2015 Share Posted January 21, 2015 If mine went, i would give that RS one a go for the price difference. This is just me speculating, but i would expect it to be the same thread and read the same signal (its only detecting a magnet as it spins i think) but just with different connectors on the end. I would think a snip of the wires to connect them up to your existing loom and it would work (best to waterproof any joints i would think). AFAIK, the main thing with these is to get the distance between the sensor and the magnet correct but that can be matched up by the depth of the thread on the existing sensor. Quote Link to comment Share on other sites More sharing options...
western Posted January 21, 2015 Share Posted January 21, 2015 Or remove the original speed sensor, blank the hole & convert to a manual switch for engagement, this would remove the automatic disengagement at less than 30mph Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 21, 2015 Share Posted January 21, 2015 Or remove the original speed sensor, blank the hole & convert to a manual switch for engagement, this would remove the automatic disengagement at less than 30mph Any risk of damage with this Ralph? They did the whole not less than 30 thing to remove the risk of damage at high torque in lower gears. It would make the unit more simple though. Quote Link to comment Share on other sites More sharing options...
Oakmaster Posted January 21, 2015 Author Share Posted January 21, 2015 Any risk of damage with this Ralph? They did the whole not less than 30 thing to remove the risk of damage at high torque in lower gears. It would make the unit more simple though. That is one of my concerns However, while I was trawling through the wealth of knowledge available on this excellent forum, I have come across posts pointing out that if you try to reverse with the OD engaged you instantly wreck the roller bearings, I assume this is a function of the Over Drive being dropped out below 30 MPH and you cant, (well probably wouldn't!) engage reverse whilst traveling forwards - How is the Overdrive otherwise disengaged? do you replace the control box with a relay linked to the reverse light switch (and how much would you want to rely on that?) Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 21, 2015 Share Posted January 21, 2015 That is one of my concerns However, while I was trawling through the wealth of knowledge available on this excellent forum, I have come across posts pointing out that if you try to reverse with the OD engaged you instantly wreck the roller bearings, I assume this is a function of the Over Drive being dropped out below 30 MPH and you cant, (well probably wouldn't!) engage reverse whilst traveling forwards - How is the Overdrive otherwise disengaged? do you replace the control box with a relay linked to the reverse light switch (and how much would you want to rely on that?) The feed from the reverse switch is what i would do if i was doing it this way, otherwise it relies on remembering and i would be bound to forget! Quote Link to comment Share on other sites More sharing options...
western Posted January 21, 2015 Share Posted January 21, 2015 IIRC mmgemini on here has removed his speedo sensor & selects manually. as to the OD engaged & selecting reverse why would you, I've certainly never attempted it. do to the drive to have mechanical sympathy with his/her vehicle not overstress components Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 21, 2015 Share Posted January 21, 2015 IIRC mmgemini on here has removed his speedo sensor & selects manually. as to the OD engaged & selecting reverse why would you, I've certainly never attempted it. do to the drive to have mechanical sympathy with his/her vehicle not overstress components It's not about trying to engage it in reverse. It's the fact that you may have forgotten to disengage it or your hand might slip on the button, without the speed sensor releasing it or stopping it engaging, you might not be able to avoid it. IIRC, Mike had his connected to a 12volt socket that he could push in there lighter socket, but I don't think he uses the overdrive now! Quote Link to comment Share on other sites More sharing options...
Oakmaster Posted January 21, 2015 Author Share Posted January 21, 2015 The feed from the reverse switch is what i would do if i was doing it this way, otherwise it relies on remembering and i would be bound to forget! I'm afraid Im in this camp, and while I do drive with a lot of sympathy for my Landrover(s) mainly through fear of expensive bills, (Im half Scots, and half 'Northern' so 'Tight' in other words ) there are times when I would forget to drop it out, usually approaching a difficult junction in strange location, and might set off with it engaged - but l could forsee a situation when I might grab reverse without thinking, maybe need ing to take evasive action (having drifited to a halt with it engaged) Or maybe because Im an aging numpty and prone to forgetfulness! the overdrive will be going on my Green laner, and main towing vehicle - so the consquences of forgetful aging numptyness could be much amplified! Cheers Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 21, 2015 Share Posted January 21, 2015 Pretty sure the overdrive is the same as the old Dolomite boxes... In which case they are fine in reverse, we took off the lock out and had a 2-speed in reverse car, nothing imploded at all. Also worked ok in first and second gear. Granted this is not exactly the same unit, and a lot more torque than from the 1850 it had in it back then, but doesn't seem to indicate immediate destruction from being on in reverse. Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 21, 2015 Share Posted January 21, 2015 Pretty sure the overdrive is the same as the old Dolomite boxes... In which case they are fine in reverse, we took off the lock out and had a 2-speed in reverse car, nothing imploded at all. Also worked ok in first and second gear. Granted this is not exactly the same unit, and a lot more torque than from the 1850 it had in it back then, but doesn't seem to indicate immediate destruction from being on in reverse. Is there a difference because the drive on these comes in and back out of the front whereas the triumph ones would have been in front and out back? It specifically says in the manual I think that the gear set is one way. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 22, 2015 Share Posted January 22, 2015 That is possible, I'm really not sure! Was great for J-turns, btw Quote Link to comment Share on other sites More sharing options...
JeffR Posted January 23, 2015 Share Posted January 23, 2015 Never had a problem using overdrive in reverse, both on the 200TDi Defender and the V8 Station wagon. Never broke either. Only phlegm I ever had was the overdrive working loose on the V8, but that was cured using locktite on the screws. Quote Link to comment Share on other sites More sharing options...
Oakmaster Posted January 23, 2015 Author Share Posted January 23, 2015 Never had a problem using overdrive in reverse, both on the 200TDi Defender and the V8 Station wagon. Never broke either. Only phlegm I ever had was the overdrive working loose on the V8, but that was cured using locktite on the screws. That is very interesting Jeff, so do we then assume that you had bypassed the speed sensor? and were just using the switch on the gear lever ? Quote Link to comment Share on other sites More sharing options...
Oakmaster Posted January 28, 2015 Author Share Posted January 28, 2015 The RS components version is 5/8th and the original is M16 1.5 thread the GKN one has a fixed collar to space it - RS one has an adjustable nut Not sure how compatible they are http://uk.rs-online.com/web/p/magnetic-pickups/0285756/?searchTerm=285-756&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B337D5B5C732D2F255C2E2C5D5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3238352D37353626 Quote Link to comment Share on other sites More sharing options...
JeffR Posted January 29, 2015 Share Posted January 29, 2015 That is very interesting Jeff, so do we then assume that you had bypassed the speed sensor? and were just using the switch on the gear lever ? Not intentionally.......but yes! Quote Link to comment Share on other sites More sharing options...
Snagger Posted August 23, 2023 Share Posted August 23, 2023 I don’t know the workings of these units - I had understood that the springs apply pressure to the disengaged clutch packs and that oil pressure delivered past the solenoid valve allowed the disengaged clutch to free up and applied pressure to the engaged clutch pack. If so, then low rpm would produce low flow or low pressure, so the overdrive would automatically be disengaged, but there would be a transitional speed where the unit may pulse back and forth making driving unpleasant or even dangerous, so the speed controller would prevent premature engagement until the oil pressure was high enough for reliable engagement. It would make sense to use road speed sensing rather than oil pressure sensing for this as it would allow for pressure drops during gear changes and prevent use in reverse. I’d be curious to know if that idea is anywhere close to the mark. Quote Link to comment Share on other sites More sharing options...
western Posted August 24, 2023 Share Posted August 24, 2023 Devon4x4 do or did a kit so OD can't be selected when reverse is selected. https://www.devon4x4.com/overdrive-speed-sensor-control-box-over-ride-kit.html Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 24, 2023 Share Posted August 24, 2023 Two crimp terminals and a piece of wire? 1 Quote Link to comment Share on other sites More sharing options...
western Posted August 25, 2023 Share Posted August 25, 2023 There is a relay to, I can post the info sheet later when I finish work. Quote Link to comment Share on other sites More sharing options...
Kozzy Posted August 30, 2023 Share Posted August 30, 2023 yeah that would be good if you could Quote Link to comment Share on other sites More sharing options...
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