![[Datsun 1200 encyclopedia]](/wiki/upload/wiki.png)
Datsun 1200 used a traditional vane-type water pump, driven by the fan belt. The same pump was used from 1966 Datsun B10 to some 1982 Datsun B310. However, air conditioning-equipped models used a different hi-performance pump, and some models used a short-shaft pump.
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Overview
Datsun 1200 style long-nose pump:
B310 A/C pump (short-nose). Can be used with matching fan.
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If you use regular water in the engine, it will look like this:
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Use coolant/antifreeze to to prevent the rust. NOTE: This is mild oxidation, and has not damaged the pump.
Comparison
There are two basic water pumps for A-series engines, each of which uses a different pulley and fan.
NOTE: Both setups are exactly the same length block-to-fan, so they interchangeable as a set along with the pump.
1. Short pump with short pulley, spacer and high offset fan
2. Long pump with long pulley and low-offset fan
You can't mix and match these parts, as the short pump uses a different bolt pattern (the spacer is an adapter allowing the fan to bolt up).
- Datsun 1200 is long shaft, large pulley (spins slower)
- Newer is short shaft with spacer, small pully (spins faster)
- Note that the pulley bolts are wider apart in the newer pump
- Newer pump has studs for the spacer
- Some aftermarkets pumps have a sheet-metal impeller, smaller but more agressive
- Genuine Hitachi and Atsugi pumps (both A12 and A15) have a cast iron impeller
Cast iron vs. stamped steel impellers. Cast iron shaped impeller is superior at high RPM.
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Heavy duty water pump installed on all 210s starting with late September 1979 production of 1980 model year vehicles.
A14-433246-B HLB310-693967 KHLB310-563501 WHLB310-047416
A15-028246 KPLB310-201907 WPLB310-021027
A12A-112069 LB310-0211047 LB310-044592
Part Numbers
B110 21010-18003 (BA010-M6626) ASSY-PUMP WATER B110 $45.67 21010-18027 ASSY-PUMP WATER WITH GASKET 21010-H1025 ASSY-PUMP WATER WITH GASKET 0971-1072 (1972 model year)
Gasket (new and old style use same gasket) * 21014-H1001 GASKET-WATER PUMP through 1982 model year (A10, A12, A13, A14, A15, A12A) $4.13
http://www.rockauto.com * Beck/Arnley 1310366 $34 Short type
Others 21010-H5025 (BA010-M6626) ASSY-PUMP WATER WITH GASKET 1172- $45.67 USD * Used through 1982 model years B110, B210, B310
* Bosch 96005 with 1.970" fan pulley bolt pattern.
B210, B310 OPTIONAL Aircon A14 From 0876 * 21010-H7225 (BA010-H7289) ASSY-PUMP WATER WITH GASKET FOR AIR COND From 0876 Optional A14 $57.17 * Bosch 96024 with 2.362" pulley bolt pattern
Specifications
Casting marks: Hitachi 13 long (smooth shaft) TO Casting marks: Atsugi 13 short (ribbed shaft) X11 with studs
Datsun 1200 Pump vs Short Pump * pulley flange bolt centers: 1.970" vs 2.370" * pulley flange diameter: 2.42" vs 2.95" * pulley flange center locating hub: 0.85" vs 1.24" * Height of flange outer face from block: 2.38" vs 1.98"
Fan
Datsun 1000 used a metal 4-blade fan. Datsun 1200 uses a tough plastic 4-blade fan of 310 mm diameter (12.2 inch). They are strong and not known to break. Some newer A14 used the same diameter fan but with a negative offset and was used with a spacer. Most newer engines used a 330mm fan with spacer. Datsun 1200 used no spacer, but used a longer water pump. 330mm fan was Datsun 1200 OPTION FOR TROPICAL USE.
Pulley ratio: 1.08 Fan pulley: 129 mm Crankshaft Pulley: 139 mm
USA dealer option flex-fan
Comparison
There are five diameter of fans for RWD A-series engines:
- Small steel fan: 280 mm used on Datsun 1000
- Lo-output engine: 310 mm diameter plastic (used on A10/A12/A13/A14/A15)
- High-output engine: 330 mm diameter plastic (also B110 OPTION)
- PB310 and HB310: 350 mm diameter - thermo, 7 blades
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- Electric fan: 320 mm diameter, steel 5-blade (some 1980-1982 B310s)
In USA, A/C 1200s got a flexi-fan (fibreglas blades), while B210, B310 used #2 above.
Late Model Vanette A/C Type
Nissan items, From USA catalog:
- 21060-H1001 FAN-COOLING(310 X 4) A12 [standard B110 fan] A12, A13. Also A14 GFU models, A12A, A14/A15 KFU
- 08120-62010 BOLT-HEX FIXING FAN (4)
- 21069-21000 WASHER-COCK FIXING FAN [bend-tab lock strip]
- 21060-H9920 FAN-COOLING(310 X 4) A15 Manual from 0180
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- 21060-A4605 FAN-COOLING D=330 FOR TROPICAL USA (330 mm diameter) OP A12 CRANK B110
- Supercedes 21060-N0100 OP A12 B110
- 21060-H5700 FAN-COOLING(330 X 4) A13, A14, A15 (1974-1982)
- 21060-W5000 FAN-COOLING(350 X 7) (FOR AIR-CON) B310 A14, A15
Spacers
- B110 - no spacer
- 21064-H5000 SPACER-FAN A13 [looks to be a thin spacer]
- 21064-H7200 SPACER-FAN A14 to 0779 [thin spacer]
- 21064-H9900 SPACER-FAN all From 0879 [thick spacer]
B210 used B110 pulley but with thin spacer.
A12A with A/C
- 11720-H9911 BELT-FAN(977)(FOR AIR CON) OP A12 CAL from 0879
- 11721-H7210,11721-H7200 BELT-FAN(970)(FOR AIR CON) FED
A14 With A/C
- 21082-H7200 ASSY-COUPLING,FAN FOR AIR CONDITIONER A14 to 0776
- 11721-69900 BELT-FAN FOR AIR CONDITIONER(960M M)
- 21082-H7201 ASSY-COUPLING,FAN FOR AIR CONDITIONER A14 0876-up
- 11721-H7200 BELT-FAN FOR AIR CONDITIONER(970M M)
- 21082-H9920 COUPLING ASSY-FAN (FOR AIR-CON) A15 from 0180
- 21082-H9100 COUPLING ASSY-FAN (FOR AIR-CON) OP A14,A15(CAL)
- 21082-H9300 TEMP COUPLING ASSY-FAN (FOR AIR CON) OP A14,A15(FED)
Plastic Fan
310 mm Plastic fan
- 3.82 diameter center section
- 310 mm (12.2 inch) diameter blades
- 1.28" thick
- bolt pattern: 1.970"
- hub locating hole: 1.24"
- Bolts: (4) ten mm hex head, M8? threads. Early B110 used regular lock washers, later ones use metal strips and bent the up to lock the bolts.
310 mm fans came with these offsets:
- Shallow used with short pump: flange from back: 10mm, from front: about 1+". Requires spacer.
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- Deepdish (B110) with long pump: flange from back: 0.84" (20mm), from front: 0.35" (9mm)
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- Unknown: flange from back: 5mm (reported)
Electric Fan
For factory and aftermarket, see Electric Fan
Pulleys
These are the common pulleys:
- Datsun B110: 129 mm (~5.05") diameter, 2.33" high, locating hub 0.85"
- Datsun B310: 4.22" (~107mm) diameter, 1.74" high, uses spacer, locating hub 1.98"
The long pump (B110) uses a fan with positive offset. The short pump (B310) uses a fan with negative offset, but with a spacer. The overall height of fan from block face is the same for both models.
- 21051-18000 PULLEY-FAN & WATER PUMP
- Original Style: 1.970 inch bolt centers
- A10, A12, A13, A14, A12A
- B10, B110
- B210 (with spacer)
- B310 to 0779 (with spacer)
- 11720-18002 BELT-FAN L=838 [For B110]
- 21051-H9900 PULLEY-FAN & WATER PUMP
- New style: 2.362 inch bolt centers.
- Spacer has 1.970 holes on the fan end
- B310 from 0879
- A12A, A14, A15
- 11720-H9910 BELT-FAN(987) A12A Cal From 0879 [For B310]
- replaced 11720-77701 BELT-FAN(980)
- 11720-H9910 BELT-FAN(987) A12A Cal From 0879 [For B310]
The two combos of pump/fan/spacer interchange as a whole combo. The newer type allows the fan to be unbolted while the radiator is still in the car.
Presumably the A-series moved to a small diameter pulley to slow down pumping flow, perhaps to prevent cavitation at high speeds.
A third pulley is the B310 Aircon setup:
- 21051-H7200 PULLEY-FAN & WATER PUMP (D=103)
- B310
- OPTION A14,A15
- No spacer, but instead a clutch
- 7-blade fan (350 mm)
- 11721-H7210 BELT-FAN(970)(FOR AIR-CON)
Belts
See Fan belt
Electic Water Pump
Water Pump delete cover plate
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Datsun 1200 spec is 12 liter/minute @ 5 meters. Outlet is 1 inch inside diameter. It requires the maximum flow at peak HP, so it depends on how much HP you will build in, and the radiator size/efficiency.
For drag racing, you can turn off the pump while accelerating. For street use, an electric water pump decreases the reliability (because the standard mechanical pump is virtually 100% reliable).
lamb_daiquiri: I've got an 80lpm Davies Craig pump on my A15 with a pump controller. Most of the time it just pulses (when I can hear it). The controller replaces the thermostat for regulating coolant flow by adjusting pump speed based on a temperature sensor. Once up to temperature I don't see the needle move at all. Don't ever run the pump dry, they have ceramic seals in them that don't like to be run dry. I've also got a electric fan switched off a 70°C thermo switch mounted on the radiator outlet. Comes on when it needs to.