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Revision as of 08:49, 13 January 2008

Datsun 1200 uses a traditional pellet-type engine cooling thermostat. It regulates temperature by closing when cold to keep hot water in the engine, and opening when hot allowing the coolant to flow to the Radiator to shed heat.

1 Cooling Thermostat
2 Thermostat Housing

Cooling Thermostat

Replacement

Replacement of the thermostat is called for when:

the engine runs too hot and other causes have been out. See Cooling System Diagnoses
the engine runs too cold

Put a bucket under the radiator fan to catch spilled coolant
Loosen the clamp on the hose at the water outlet
Twist and pull the hose off the outlet
Remove the two fastening bolts
Scrape all traces of gasket off water outlet and cylinder head face
- be careful not to nick the aluminum of the gasket faces
Fit thermostat into engine, then gasket, then housing and tighten moderately. The gasket goes against the housing (not the head).
Top up coolant
Rinse spilled coolant off engine and body with water
After engine has been fully warmed up, and cooled down, top up coolant again.

Be sure to fit thermostat with spring facing into engine

WARNING: Due to air pockets, the coolant level usually drops down and the engine can easily overheat if not monitored for a few days after changing the thermostat.

Temperature

It is not unusual with any 10-year old stock radiator for the temperature to rise during summer. If you have this, don't panic. The engine can run all day close to the "H" mark. Just don't let it go over that. If you are worried, replace the radiator.

Use the stocko fan. Electric fans are notorious for failing to cool the radiator in stop/go traffic.

What is the correct temperature the engine should run at? Primarily, this depends on the thermostat. You can get different temp thermostats, and the coolant should stay steady at that temperature:

160 degree (76.5 Celsius) optional
180 degree (82 Celsius)?stock B110 thermostat
212 degree (88 Celsius) optional, winter for hotter heater

160-degree is good for drag racing, or for use with low octane fuel. 180 is recommended for all street cars, it will keep the oil at optimum temperature (oil runs about 20 degrees hotter than the coolant). 212 degree is only run on emission-control cars along with a 14 lb. radiator cap to prevent boiling.

After the thermostat, the radiator is the next factor. If your temp. stays steady except on the hottest summer days it seems you need a replacement radiator, either a new or rebuilt stock unit, or a larger used unit (from a B210 or B310).

Thermostat Types

Newer Type - advanced type with 'jiggle' valve

Thermostat Testing

Test it like this:

Thermostat Part Numbers

Buy at http://www.rockauto.com

Gaskets

There are various gaskets.

4-bolt gaskets works on a 2-bolt housings.

2-bolt: 11062-18000 GASKET-WATER OUTLET
4-bolt: 11062-M3001 GASKET-WATER OUTLET
4-bolt: 11062-H7201 GASKET-WATER OUTLET

Cooling Thermostat

Cooling Thermostat. $7-$16

Nissan Part Numbers

B10, B110 and early B120:

21200-78500 THERMOSTAT 82 C
21200-A3001 THERMOSTAT 82 C EVAPO systems
21200-78502 THERMOSTAT 76.5 C (optional, for tropical use)???????
21200-A3005 THERMOSTAT 88 C (optional, winter)

Late B120, early B122:

21200-H7800 82 C 7602-8503
21200-V0105 88 C 7908-8109?????????
21200-V0205 88 C 8110-8503?????????

Late B122

2100-G3100 82 C 8504- ???????
2100-G3160 82 C 8504- ??????????
2100-V0206 88 C 8504- ????????

Interchange

Honda 1994 - 1996 PASSPORT

ISUZU 1989 - 1994 AMIGO, 1992 IMPULSE, 1981 I-MARK, 1981 - 1995 PICKUP, 1985 - 1989 I-MARK, 1991 - 1997 RODEO, 1988 - 1990 IMPULSE, 1984 - 1991 TROOPER
NISSAN , 1971 - 1973 1200 , 1980 - 1986 720 PICKUP , 1977 - 1988 200SX , 1977 - 1981 810 , 1979 - 1982 210 , 1974 - 1978 B210 , 1974 260Z , 1986 - 1989 D21 PICKUP , 1975 - 1978 280Z , 1976 - 1978 F10 , 1979 - 1982 280ZX , 1982 - 1984 MAXIMA , 1979 - 1982 310 , 1987 PATHFINDER , 1971 - 1973 510 , 1983 PULSAR , 1978 - 1981 510 , 1983 - 1989 PULSAR NX , 1971 - 1972 521 PICKUP , 1982 - 1988 SENTRA , 1973 - 1976 610 , 1982 - 1989 STANZA , 1972 - 1979 620 PICKUP , 1987 - 1988 VAN , 1974 - 1977 710

Thermostat Housing

Nissan calls the thermostat housing the "Water Outlet".

11062-18000 GASKET-WATER OUTLET

11060-G0300 OUTLET-WATER B110 JDM, USA
11060-H7000 OUTLET-WATER B110 USA MANUAL from 0373
- Has boss for temp switch
  22120-U2001 ASSY-SWITCH WATER TEMP from 0373

A-engine Variations

There are a number of different type for A-series engines.

2-bolt Type -- as used by early engines, and some late engines
4-bolt Type -- newer engines

It further breaks down:

2-bolt Type -- as used by Datsun 1200
- B10/B110 Type, outlet points 180 degrees
- Late B110 USA -- with boss for thermo switch
- B210/B310 Type - Outlet points 225 degrees
4-bolt Type -- as used by some newer engines
- with accessory mounting bosses
- with accessory mounting bosses and Air fitting
- with accessory mounting bosses (forward) and Air fitting

2-bolt Type Thermostat housings attaches radiator hose at:

B10/B110: 9:00 o'clock (180 degrees)
B210/B310: 10:30 o'clock (225 degrees)

Head Mating Surface

Head Mating Surface - A14 with Air passage

Head Mating Surface - A14 w/o Air passage

Housing Part Numbers

NOTES:

CAL = California
CAN = Canada
FED = USA, except California
GFU = 5-speed Round-port A14 engine
JDM = Japan Domestic Market
Gasket is also called "WASHER-JOINT WATER OUTLET"

The 4-bolt gasket works on a 2-bolt housing.

2-bolt Type

The 2-bolt type is used by B10, B110, and some B210/B310 engines that do not have Air Pump or Air Induction passage in the cylinder head.

11062-18000 GASKET-WATER OUTLET

11060-18000 OUTLET-WATER B10
11060-G0300 OUTLET-WATER B110 A12 JDM
11060-G0300 OUTLET-WATER B110 A12 AUTOMATIC USA
11060-G0300 OUTLET-WATER B110 A12 MANUAL from 0273 USA
11060-H7000 OUTLET-WATER B110 A12 MANUAL from 0373 USA
- Has boss for temp switch:
  22120-U2001 ASSY-SWITCH WATER TEMP from 0373

11060-H5000 OUTLET-WATER B210 A13 USA 1974, A12 JDM early
11060-H5000 OUTLET-WATER B310 A12,A13,A14,A15 JDM 8011-
11060-H5000 OUTLET-WATER B120 A12 -8910
- 11062-H7201 GASKET-WATER OUTLET

You can see how on newer engines, the alternator bracket bolts next to the outlet. This requires the outlet at 45 degrees up so the bolt is uncovered.

11060-G2500 OUTLET-WATER B120 A12 8910-
- 11062-H7201 GASKET-WATER OUTLET -9202
- 11062-18000 GASKET-WATER OUTLET 9202-

4-bolt Type

All engines with Air Pump or Air Induction passage in the cylinder head require a 4-bolt housing and gasket. Some newer engines without Air system still use the 4-bolt kit.

4-bolt Type (2 accessory bosses straight up)

- 11062-H7201 GASKET-WATER OUTLET
11060-H7201 OUTLET-WATER B210 A14 USA
11060-H7400 OUTLET-WATER B210 A14 FED GFU from 1276
11060-H7400 OUTLET-WATER B210 A12 late, A14
11060-H7400 OUTLET-WATER F10 A14 USA

4-Bolt Style - no air passage

11060-M3001 OUTLET-WATER B310 A14,A15 FED
- 11062-M3001 GASKET-WATER OUTLET B310 A14,A15 FED
11060-H9100 OUTLET-WATER B310 A14,A15 CAL,CAN
- 11062-H7201 GASKET-WATER OUTLET B310 A14,A15 CAL,CAN

Air Pump Style - bosses up

11060-M3001 OUTLET-WATER B310 JDM -7812 A12 S,K; A14 V
- 11062-M3001 GASKET-WATER OUTLET JDM -7812 A12 S,K; A14 V

Air Pump Type - Bosses Forward

A12A USA Engine

11060-H9100 OUTLET-WATER B310 A12A from 1278
- 11062-H7201 GASKET-WATER OUTLET A12A CAN from 1278
- 11062-M3001 GASKET-WATER OUTLET A12A FED from 0879
11060-H5000 OUTLET-WATER B310 A12A CAL from 0879
- 11062-H7201 GASKET-WATER OUTLET