Re: A Tale of Two Patricians

Posted by HH56 On 2021/3/14 23:53:23

I believe the 6 blade came about for 55-6 but that 53-4 AC or heavy duty cooling fan has been a question.

They mentioned the availability of a heavy duty fan in a 54 SC and said it could be made retroactive for installs back to 51 on cars that needed it. The number was given as 436856 but that part number does not show in the parts book nor did they mention what the difference was.

There is another bulletin issued in 51 where they announced a heavy duty fan and give a diameter of 19 7/8" vs 18" for the standard fan. That fan has the part number in question of 433779 as used for the 53-4 AC.

I am wondering if there was an error in part number with the second announced heavy duty fan or maybe announced but never made. Since they had already issued a heavy duty fan for 51 models maybe they realized it was not needed or the number was wrong in the announcement but corrected in the parts manual. I guess there could have been some kind of problem with the second version fan since they did issue a zone only bulletin in 54 advising mechanics check distance to the radiator core on cars that had excessive fan noise and replace the fan with still another number if needed.