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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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New (to me) 1963 Volvo 122Views : 651591 Replies : 1375Users Viewing This Thread : |
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Sep 7th, 2022, 20:26 | #961 |
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The 1800 has the rear set shift mechanism so the PO / you have obviously fitted a cover and lever from a non 1800. My comment about the dog on the 3-4 shift rail was based upon the 140 parts parts manual 140 which up to 1972 would have the same shift lever / cover as would have been fitted to an Amazon. The 1800 M41 does have some differences beyond the shift lever / top cover.
Depending on the vintage of the 1800 it has a different reverse switch mounted on the side of the shift lever housing (not the common tin can mounted on the back of the transmission) and it might have a different OD interlock arrangement. I don't have an 1800 parts manual. Knowing the vintage of your 1800 M41 would allow you to check the parts manuals to see where the interlock switch is mounted. If the 1800 M41 in your car originally had its OD interlock mounted on the top cover (like the M41 in the 140 and Amazons that were factory equipped with an M41) then it will have the dog mounted on the 3-4 shift rail and from that perspective you are good to go. Since your top cover is obviously not an 1800 top cover, the question remains does it have the boss for the switch? Based purely on anecdote, I was of the impression that all the covers had the boss for the interlock switch. However, with the car jacked up in the air and safely secured it should be possible to reach up with your hands and feel whether there is a boss present. On my 1971 142, I was able to replace a failed interlock switch on the top cover in situ, although the 140 may have a wider tunnel. Last edited by 142 Guy; Sep 7th, 2022 at 20:29. |
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Sep 7th, 2022, 21:06 | #962 | |
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There has been a lot of discussion on this matter in this thread previously. The boss you talk of exists and has already been tapped (to the wrong size - the details don't matter here but are covered in previous posts above). Here is a photo looking down the transmission tunnel: ... the gearbox will have to come out of the car and the cover be removed to tap the hole to the right size and fit the inhibitor switch. :-)
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Sep 7th, 2022, 21:45 | #963 |
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I was sure I had taken some photos of the box when I bought it, so have just charged up a multitude of old mobile phones and unearthed these three images - they show the OD inhibit switch on the original P1800 top cover, before I put the cover from the car's original M40 on it.
I always assumed the gearbox was from a very early P1800 as it has the U bolt type coupling for UJs and no reverse light switch at all - I think somebody on this forum told me the very early P1800s had no reverse lights. I also moved over the reverse light switch and mount from the M40, but in the process of fitting the gearbox I knocked the switch off. I couldn't fit the switch with the box in place, and was loathed to drop the box again simply to fit the switch. David Edit: The original thread is here: https://www.volvoforums.org.uk/showthread.php?t=102556. It suggests I tested the switch so I'm confident the dog is present and you'll be able to make it work again Alan. Last edited by dgbalfour; Sep 7th, 2022 at 21:56. |
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Sep 7th, 2022, 23:13 | #964 | |
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Best wishes, Alan
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Sep 7th, 2022, 23:29 | #965 |
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In post #957 I understated the differences between the M40 and M41. That is an embarrassment because having re gasketed my M41 that should have been obvious to me. The M41 main shaft / output shaft is significantly different than the M40 because of the need to fit into the OD unit. It is physically possible to fit the M41 main shaft into an M40 gear box to allow fitment of an OD onto what was originally an M40 box. However, sourcing that main shaft and the other related bits is a problem unless you had access to an M41 with some internal damage and were able to salvage the M41 specific parts to fit to an M40. The basic M40 case is also different, lacking the holes to allow oil to flow to the OD making filling the OD a challenge (I suppose a drill could fix that).
The short answer to this run around is that if your transmission has an OD attached to it, it is almost certainly a factory M41 and should have the dog for engaging the OD lock out switch. |
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Sep 8th, 2022, 06:03 | #966 | |
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I need to get on and sort this switch out before the winter. Alan
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Sep 16th, 2022, 20:34 | #967 | |
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I'm thinking that a Volvo relay like this one should work: https://classic-volvo.com/relay-rela...1347768_b.html ... with a momentary switch mounted just under the dashboard. The Swedespeed article looked very useful, but I couldn't see the schematic for the 'Photobucket' watermark - does anyone know how I'd get rid of that (I do hope it is not a paid subscription - that would be tiresome)? For the cost of a relay and a momentary switch (perhaps £30 total) fitting a M46esque control system at the same time as the inhibitor switch would be the right thing to do. :-) PS. I found a really good article in the Ron Kwas pages on this topic: https://www.sw-em.com/OD_Retrofitting.htm#OD_Wiring_2 In particular this little diagram of exactly what I'm thinking of: ... that looks simple enough. I was thinking of a small modification such that the tel-tale only illuminated when the OD was actually engaged might have more utility: ... particularly if I used a LED bulb with a large impedance.
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... another lovely day in paradise. Last edited by Othen; Sep 16th, 2022 at 21:10. |
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Sep 16th, 2022, 21:03 | #968 |
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Article how to install here as well. https://www.volvoamazonpictures.se/g...structions.php
An old thread https://www.volvoforums.org.uk/showt...ight=Overdrive Adam previously sent me a build doc he made, not sure where I saved it probably on my work computer.
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One day I will get rid of all of the rust. Last edited by Burdekin; Sep 16th, 2022 at 21:09. |
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Sep 16th, 2022, 21:41 | #969 | |
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A similar variation on a theme. The chap has used a pretty ancient (but I think still available) 3 pole relay like this one: https://www.ipdusa.com/products/2131...-669102-109261 ... that would look the part more than the one from a 240. Alan
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Sep 16th, 2022, 22:23 | #970 | |
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One day I will get rid of all of the rust. Last edited by Burdekin; Sep 16th, 2022 at 22:28. |
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