NOTE:
Picture above is of a NEW fan. Used fans; when available
are typically dark and/or ugly from heat, stains etc. The
car won't care; but you might.
For
"smog" & "non smog" cars.
The
4 blade fans are different on the two cars. (smog and non
smog) Cars that originally had the air injection emission
system (all 68-70 USA cars and some Canadian cars) came
with a 7
blade fan with a 1.5" center hole. This was designed to
try to bring the engine temperatures down during
situations of extreme heat due to the distributor that
had to be installed on the engines to meet the smog idle
test. Locking up the 7-blade fan permanently was a large
power drag and would make a car sound like a hurricane
so
a fan clutch was designed. The
percentage of 1968-70 fan clutches that failed was
tremendous, and Nissan came out with a solid block to
replace it. The clutch was a good idea, it just seemed to
fail when you needed it the most! The original clutch was
also an unbalanced blob hanging on the end of the water
pump shaft which is not conducive to long water pump
life.
When
this was changed a 4 blade fan was to be
installed.
Your
spacer should be a solid balanced block, some mechanics
simply jammed a big bolt in the fan mechanism to lock it.
Unless you want to replace water pumps or help the fan
wobble off the pump into the radiator this is not a good
idea. If you turn your engine over (big coil wire off,
4th or 5th gear, spark plugs out is easiest) you can
usually identify the original fan clutch. It will have a
hole in its side that will be visible without removing
the fan.
All
the 67 2000's and non USA "non smog" cars came with a 4
blade fan that had a different center hole diameter
(1.25" versus 1.5") and a cloverleaf style spacer. Those
spacers are beyond rare; but if you are missing these
parts on your 67 2000 or non USA 68-70 we have the later
style spacer blocks manufactured for either the 1.25"
hole or the 1.50" hole. The fans we have both ways as
well. It doesn't matter what your pulley is bored to as
that goes on to the water pump; before the spacer is
installed. All of the Nissan pumps have the 1.5" mounting
surface and all of our spacer blocks will fit the
original design water pumps.