C4 Brake Drum
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From: South Africa
C4 Brake Drum
I have stripped my C4 transmission and noticed that the brake drum has been slightly damaged by the low rev brake band. I was wondering if the drum can be skimmed smooth again or if it better to leave it alone? Any comments....
Another question, what would be the best way to clean the valves? Is is safe to let them lay in some petrol?
Mike
www.f100.1965.8m.com
Another question, what would be the best way to clean the valves? Is is safe to let them lay in some petrol?
Mike
www.f100.1965.8m.com
Senior User
Joined: Jul 1999
Posts: 472
Likes: 1
From: USA
C4 Brake Drum
[updated:LAST EDITED ON 01-16-03 AT 09:34 PM (EST)]I would not recommend surfacing drum(s) - unless a replacement drum is not available. Most transmission shops will also sell used "hard" parts like drums, shafts, etc...
The surface finish on the drum MUST be correct - too smooth will reduce the coefficient of friction (slip), and too rough will accelerate band wear.
As for cleaning valve body parts, petrol will not harm the steel or aluminum parts. If the transmission has nylon check ***** in it, keep them and all plastic and rubber parts out of the petrol(swelling/softening may occur).
You have another post asking about band adjustment. The procedure is to assemble the transmission and then adjust the bands. The adjustment screw is tightened (clockwise) until the resistance increases quickly (band clearance removed). Then rotate the adjustment screw counterclockwise the specified number of turns (usually two complete revolutions). Then tighten the locknut without allowing the adjustment screw to rotate. Ford recommends that the locknut be replaced at each adjustment, but I have re-used them several times without any problems.
Good luck
Art
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=3467&.jpg
The surface finish on the drum MUST be correct - too smooth will reduce the coefficient of friction (slip), and too rough will accelerate band wear.
As for cleaning valve body parts, petrol will not harm the steel or aluminum parts. If the transmission has nylon check ***** in it, keep them and all plastic and rubber parts out of the petrol(swelling/softening may occur).
You have another post asking about band adjustment. The procedure is to assemble the transmission and then adjust the bands. The adjustment screw is tightened (clockwise) until the resistance increases quickly (band clearance removed). Then rotate the adjustment screw counterclockwise the specified number of turns (usually two complete revolutions). Then tighten the locknut without allowing the adjustment screw to rotate. Ford recommends that the locknut be replaced at each adjustment, but I have re-used them several times without any problems.
Good luck
Art
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=3467&.jpg
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