I got a mail from a UK mail friend, also a P1800 owner who had done some driving in rainy weather. The previous owner of his car had filled the drain holes on the underside, dont know where or which but when opening almost a liter of water had poured out. That’s no good so before next workshop visit I thought I’d do some homework on rust prevention. Found a scanned print from Volvo 1962 that takes the subject seriously, a “Verkstadsmeddelande” or “Service Bulletin”. And in those times these cars were of course encountering bad weather including snow and salted winter roads.
Major parts of the scheme below. Equipment needed: a tube (max 20mm diameter) spraying relevant rust preventing oil. Disclaimer: English may not be 100% correct here.
Fig. 3. A- and B-post + below back seat
1. Remove seats and floor mats at the A- and B-post.
2. Clean drainage holes in the bottom door sill beams
3. Then seal all drainage holes (door sill) e.g. with tape except the one furthest back.
4. Push tube as far down and back as possible (Fig 3a) and spray while retracting it
5. Push tube as far ahead as possible (Fig 3b) and spray while retracting it slowly. More is better than less.
6. Oil should come from the drainage hole, then this part of the treatment is finished.
Fig 4. Front wheel arch.
Front Wheel Arch
1. Drill two holes according to a in Fig 4, diameter 12mm. Clean/blow out any dirt/water there.
2. Put tube in back hole as far back as it goes, and likewise forward and spray til fluid drops in front
3. Thoroughly clean the space between sheet/joint b in Fig 4. Remove seal if there, and make sure to seal it back again and cover with rust preventing body sealant (underredsmassa)
4. The space between sheet and body strengthening is sprayed before.
Front Wheel Arch, back
1. Remove plates Fig. 4 c)
2. Spray all areas, including back side of plate before fitting it again
1. to be completed…
Other (no fig)
1. Remove lighting housing and spray the interiour of the body there.
2. Doors: clean drainage holes and then spray the doors inner lower parts.
Some years ago I found 4 images from below a P1800. I saved them as they were very informative. Here I’ve put them together to get a full view of the body from below – with drainage/ventilation holes clearly visible. I dont know the source but post them with the potential that someone find them useful. If the owner of these 4 images let me know I’ll remove them from this site – or give full credit to the photographer. Click on it to enlarge.
Original print. Found it deep into the vaults of the P1800 club, if I find it again I’ll post the link.