4L80E experts: overheated forward drum
#1
4L80E experts: overheated forward drum
I'm tearing down my 4L80E to rebuild and it looks like the forward drum assembly got really hot. Is this a concern? Should I replace these parts since they got hot?
S.F
S.F
#3
I'll check the lands for damage and I plan on replacing the steels and frictions but do I need to worry about the drum, direct and forward hubs being damaged due to the heat? Can these parts warp or weaken due to excessive heat?
Thanks!
S.F.
Thanks!
S.F.
#6
TECH Fanatic
If the Input Shaft didn't damage the drum.....Don't worry! When there real bad I media blast them (Cover the Checkball in the Drum with tape or just be careful not to blast it) Then clean the drum real well, Watch for friction material build up around the Checkball.
#7
I bet the discoloring is from friction material, Take a razor blade & see if the black stuff scraps off, High Energy frictions make a mess when they burn up!
If the Input Shaft didn't damage the drum.....Don't worry! When there real bad I media blast them (Cover the Checkball in the Drum with tape or just be careful not to blast it) Then clean the drum real well, Watch for friction material build up around the Checkball.
If the Input Shaft didn't damage the drum.....Don't worry! When there real bad I media blast them (Cover the Checkball in the Drum with tape or just be careful not to blast it) Then clean the drum real well, Watch for friction material build up around the Checkball.
S.F.
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#8
I bet the discoloring is from friction material, Take a razor blade & see if the black stuff scraps off, High Energy frictions make a mess when they burn up!
If the Input Shaft didn't damage the drum.....Don't worry! When there real bad I media blast them (Cover the Checkball in the Drum with tape or just be careful not to blast it) Then clean the drum real well, Watch for friction material build up around the Checkball.
If the Input Shaft didn't damage the drum.....Don't worry! When there real bad I media blast them (Cover the Checkball in the Drum with tape or just be careful not to blast it) Then clean the drum real well, Watch for friction material build up around the Checkball.
This is the part where I wish I could get the eyes of a professional on the hard parts.
S.F
#9
TECH Apprentice
iTrader: (2)
I am no professional transmission builder, but I can tell you that the 500 -1400 F temperature required to anneal any larger part like a shaft or drum would be very difficult to do, some parts inside are flame hardened, that may be the cause of the blue you are seeing. The steel plates slipping against friction discs can get that hot because they are very thin and don't have much mass.
Side note: I have never used them, but perhaps sonnax 34716-01 may be a good idea for your transmission, the photos make it look like the forward drum has wear grooves that should be cleaned up.
Side note: I have never used them, but perhaps sonnax 34716-01 may be a good idea for your transmission, the photos make it look like the forward drum has wear grooves that should be cleaned up.
#10
I am no professional transmission builder, but I can tell you that the 500 -1400 F temperature required to anneal any larger part like a shaft or drum would be very difficult to do, some parts inside are flame hardened, that may be the cause of the blue you are seeing. The steel plates slipping against friction discs can get that hot because they are very thin and don't have much mass.
Side note: I have never used them, but perhaps sonnax 34716-01 may be a good idea for your transmission, the photos make it look like the forward drum has wear grooves that should be cleaned up.
Side note: I have never used them, but perhaps sonnax 34716-01 may be a good idea for your transmission, the photos make it look like the forward drum has wear grooves that should be cleaned up.
New, Used or reman yet...
No friction material left in the forward clutch!
The direct hub looks ok though..
S.F.
Last edited by StolenFox; 06-29-2016 at 10:28 PM. Reason: Notes for pics