Ryan Q Posted October 11, 2017 Share Posted October 11, 2017 Can anyone offer some insight on the process of how to flush the hydraulic system on my '47 convertible -- system is still working fine but it's over-due and this isn't something my teacher covered in auto-shop (and the Ford service manual just says I need to do it, but no advice on how.) Thanks, R Link to comment Share on other sites More sharing options...
JFranklin Posted October 11, 2017 Share Posted October 11, 2017 (edited) Remove as much old fluid and add fluid of the same type. Bleed the system farthest to nearest, enough to run through all the old fluid. Button everything up and road test (carefully at first). Edited October 11, 2017 by JFranklin (see edit history) Link to comment Share on other sites More sharing options...
Ryan Q Posted October 11, 2017 Author Share Posted October 11, 2017 I probably should have been more specific, this would be for the hydraulic windows/top (brake system I have covered) -- is there a specific procedure to flush this system? To be honest I have yet to see where the ram for the top is located (not that I've looked very hard for it.) That would be the furthest point in the system I would assume. Link to comment Share on other sites More sharing options...
abelincoln Posted October 12, 2017 Share Posted October 12, 2017 Ryan: Old brake fluid really gums up, you may not be able to save all the lines. I had to replace several lines, rod out some with an old speedometer cable, and do my best flushing the top cylinders. I also gave up on the pump under the hood after several attempts, lines were also plugged, and got a '60 pump that fits under rear seat. I now use NAPA tractor hydraulic fluid for top lines. Smells a lot better than auto transmission fluid. Abe Link to comment Share on other sites More sharing options...
Ryan Q Posted October 13, 2017 Author Share Posted October 13, 2017 Well the system is still free flowing and functioning, lines were replaced during a late 80's/early 90's restoration as best as I can tell and appear to be in very good condition. I'm just trying to work out the best practice for removing the current hydraulic fluid and replacing as I know what's in there has been in place for some-time. Link to comment Share on other sites More sharing options...
19tom40 Posted October 13, 2017 Share Posted October 13, 2017 This is from the 1949-1951 Overhaul Manual. I am not sure if this will be the correct procedure for your 47, but it should be similar. Flush the hydraulic system each fall by: Lower all windows Move seat to rear position (it doesn't mention the top, but you should probably lower it also) Remove the ground cable from the battery Remove fluid reservoir from power unit, empty reservoir and clean it with alcohol Refill to the fluid level marker and install it Connect the ground cable Operate seat and windows several times to remove air from the system Lower all windows and move the seat to the rear position and check the fluid level. 1 Link to comment Share on other sites More sharing options...
19tom40 Posted October 20, 2017 Share Posted October 20, 2017 Ryan, did this procedure work for you? Link to comment Share on other sites More sharing options...
Ryan Q Posted October 21, 2017 Author Share Posted October 21, 2017 If all goes well I'll find out on sunday, stay tuned. Link to comment Share on other sites More sharing options...
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