Anyone out there happen to know the correct ink stamp code for a 1970 455 GSX HD Fan Clutch? I have a NOS Fan Clutch that has BJ Ink stamped on the face but not sure if this is correct.
I don't have the 1970 assembly manual handy at the moment but they are listed in the appropriate section with the correct fan and shroud. There is also a listing in the service manual but it is more difficult to find IIRC.
The assembly manuals list the part numbers not the date codes. If you want to know the range of date codes that would be correct for an Eaton Clutch fan, in the 70 GSX time period, you can buy my date code book. I sell them for $44.50 including shipping to anywhere in the 48 states. Duane
I think the BJ he lists is the Assembly line ID. I have several fan clutches and they all have the two letter code and another stamp with the date code that has letters or numbers. I think I have A BG code as well. My assembly manuals also list just part numbers not letter codes. They were also optional so it could have maybe two different clutches. The clutch I have with the BJ is a newer clutch for a later car that happens too work so it is a superceded #. It is not original for a 70 but will work. It was part number #12306568. Maybe those letters are lost to time......Get Duanes book. Lots of good info. I found a weird one I did not see in your book Duane. Power window motors. Weird date codes on those....Belwo is the BJ code Clutch whic also has confusing date code.
I also think that most of the Buick clutches had two letter B codes. I have taken some off Oldsmobiles and they all had O two letter codes
Dave, The date code of the part you pictured is easy to figure out if you use my book. (Page 17) Duane
DL. That is NOS. All the originals I have were gold as well but faded...............Duane I figured it out, Either 1993 or 2003 Considering when I Bought it from AC Delco Dealer..............Below is picture another Which I beleive is from 71 Electra Engine. Very late June 1 or 71. I beleive this is correct code for all 455 with AC and all Stage-1 Except Riv but not 100% on that. My 70 Assembly show that 70 had specific clutch for GS 455 with AC, Stage-1 and Heavy duty cooling. 71 was not as specific.
Yes sir, I am. I got the power window motor dates figured as well. I was making it too difficult. It is Julian date followed by year. 71 Etc. Most of my stash were all low numbers so I thought it was month and day but the 364 of 70 date I found on one fixed that idea.
:laugh: That's why I cross-referenced tons of parts before I "figured out" each type of code. Sometimes I thought I knew a code and the next part would throw a monkey wrench in, and I was back to square one. Welcome to my world. Duane
Ah Duane, The wonderful world fo date codes. I still have not figures out the trans date codes on the tag and engine codes under the engine code. I know you are still holding out on those.:grin: ....................................................DL why would you want to restore an original fan clutch? I have never seen a 40 year old original that was any good or at least long for this world as the silicone leaks out or shifts.
Well I guess it is still a mystery. BJ or BG old style Eaton clutch without the the fins on the front of the clutch or new style Eaton clutch with fins?????
Okay , so it's leaking. I got a Ac Delco one 88961759. Not Cheap! I think it's for chevy. the blades are wider apart. Anyone have a more correct part # ? '70 455.
All the ones with alot of numbers in the part number are later replacemnts. Good luck finding a really old correct number original. Good chance it would be bad anyway. The fluid most likely leaked out anyway.
Here you go. These are from 70 asssembly manual for fan clutch 1231437-Stage-1 with AC Optional 1377856 or 5358797 for Stage-1 non AC or GS 455 with AC or Heavy duty cooling. Confused? so were the assembly line workers.
Does anyone know of a manufacturer of thermal fan clutches which provides data as to their engagement temperature and viscosity? Those are the basic parameters which the engineers used originally to select the correct clutch for each application. Yet today all I see are one-size-fits-all replacements with no specifications. I would like to be able to tweak the operation of my fan clutch.
