According to the TRF TR 6 parts manual the TR 6 came with three, possibly
four different fans;
1) Part # 211986 - 6 blade metal fan (questionable if ever fitted)
2) Part # 311868 - 7 blades, yellow plastic, fitted to engine
CC75000.
3) Part # 308353 - 8 blade, yellow plastic, alternative to #311868.
4) Part # 312301 - 13 blade, red plastic, fitted after engine CC7500.
The 13 blade fan, Part # 312301, also required an adapter, Part # 157876 to
be mounted on the crank extension.
I would imagine that the 6 bladed medal fan mentioned above is the same
tropical fan for the TR 4As. If that is true
any TR 6 fan should fit a TR 4 as long as the appropriate mounting hardware
is used.
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