I have not done that one, but I forgot to put a back plate on a water pump
in a Ambulance.
I didn't figure it out till I had everything back together trying to fill the radiator.
Needless to say after pulling the grill back out and all the pullies off again
I have not done it again. That was the first time I had gotten a water pump without a
backing plate, Now I check them all, HE! HE! HE! Kurt