Technical Data:
TD/TAD520, TAD530/531/532
41
Group 20
Diameter Ø (
C
), standard:
Inlet ................................................................... 49
+0.025
mm
(1.929"
-0.001"
)
Exhaust ............................................................. 43.5
+0.025
mm
(1.712"
-0.001"
)
Depth (
D
):
Inlet/Exhaust ...................................................... 11
+1
mm
(0.43"
+0.04"
)
Seat bottom radius (
R
):
Inlet/Exhaust ...................................................... 1
-0.3
mm
(0.04"
-0.012"
)
Measurement between valve disc and cylinder head face
:
Inlet/Exhaust ...................................................... Min 1.5 mm
(0.059")
Ø C
R
D
Valve guides
Length:
Inlet/Exhaust ...................................................... 63
-0.5
mm
(2.48"
-0.02"
)
Inner diameter Ø:
Inlet/Exhaust ...................................................... 9.025–9.04 mm (0.3553–0.3559")
Height above cylinder head spring surface:
Inlet/Exhaust ...................................................... 23
-0.5
mm
(0.9"
-0.02"
)
Wear limit valve stem – guide:
Inlet ................................................................... 0.1 mm
(0.039")
Exhaust ............................................................. 0.13 mm
(0.51")
Valve springs
Type ..................................................................... Single
Length: Unloaded: n=2300 ................................... 64.7
±1.3
mm
(2.55"
±0.05"
)
Wire diameter Ø ................................................... 4.5 mm
(0.18")
Valve seat location
Design 1
without flange
Design 2
On later models the o-ring seal is exchange to a valve
stem sealing, according to the picture for design 2.
Design 1
with flange
Flange
Production
Exchange
O-ring
Summary of Contents for TAD420VE
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