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| = Revisions = | = Revisions = | ||
| - | H39 is the current revision. It uses no extra o-ring seal. | + | [[#H39]] is the current revision from May 1972. It uses no extra o-ring seal. It made the cylinder openings closer in size to the 73mm bores, in order to reduce emissions. Bonus, it helps HP a tiny bit too. |
| H1025 was a revision back in 1971-1972 that reduced risk of oil leaks when using H1000. Revised H1025 gasket used an O-ring seal: | H1025 was a revision back in 1971-1972 that reduced risk of oil leaks when using H1000. Revised H1025 gasket used an O-ring seal: | ||
| <br>{{Album|24735}} {{Album|24388}} | <br>{{Album|24735}} {{Album|24388}} | ||
| + | |||
| + | == H39 == | ||
| + | CYLINDER HEAD GASKET, 1972 MODEL | ||
| + | <br>{{TSB|TS72-44|May 22, 1972|EN72-007|Engine|A12,L16}} | ||
| + | |||
| + | Combustion chambers of the 1972 model A12 and L16 engines were redesinged to reduce hydrocarbon emission to a minimum and the configuration of cylinder head gaskets was changed. The opening in the cylinder head gasket at bore location is made smaller in diameter to reduce the quench area to a minimum and thus prevent incomplete combustion of the air-fuel mixture. Because of this change, the correct gasket must be used for replacements on 1972 engines | ||
| + | |||
| + | Beginning Engine Serial Number & Part Number | ||
| + | <br>A12-{{pn|Index|11044-H3900}} | ||
| + | <br>L16-203416 11044-N2211 | ||
| + | |||
| + | Interchangeability | ||
| + | <br>A12, not interchangeable | ||
| + | <br>L16, 1972 to earlier models, yes, earlier models to 1972, no | ||
| = Part Numbers = | = Part Numbers = | ||
Revision as of 09:13, 9 November 2021
The Datsun 1200 cylinder head gasket fit A12 and A10 engines. Aftermarket gaskets vary in material and size of cooling holes. Aftermarket gaskets may come with oversized bore holes.
Contents |
Overview
Also See: * Changing Head Gasket * Tune-upNissan recommends re-torquing the head gasket bolts ever twenty-four months (every two years):
1972 USA Owners manual (Page 34 ... ):
Retighten cylinder head bolts, manifold nuts & carburetor securing nuts.
slight weeping leak
Thickness
Most A-series head gasket are 1.6 mm thick. Some are 1.2 mm thick. Nismo MLS gasket is 0.5 thickness.
See Quench#Gaskets
Blown Gasket
When a head gasket is blown out (partly missing) between cylinders it is obvious, and the engine will run on "two cylinders" (barely run, if at all).
But head gaskets more often fail in a less obvious manner -- they lift up enough to allow compression to leak past, causing low compression. An Engine compression test will find this.
A more rare failure is of the oil or water passage. The engine will still run perfectly, but oil will leak or coolant will be lost. A Cooling System Pressure Test can often pinpoint the diagnosis.
Coolant leaking into the oil pan, causing "milkshake" to be visible on the oil cap and dipstick
Turbo Boost/Supercharger
Standard head gasket works fine to at least 15 psi boost. Over 15psi, consider going to a copper head gasket and orings, which requires a special finish and coatings.
Revisions
#H39 is the current revision from May 1972. It uses no extra o-ring seal. It made the cylinder openings closer in size to the 73mm bores, in order to reduce emissions. Bonus, it helps HP a tiny bit too.
H1025 was a revision back in 1971-1972 that reduced risk of oil leaks when using H1000. Revised H1025 gasket used an O-ring seal:
H39
CYLINDER HEAD GASKET, 1972 MODEL
Bulletin Number: TS72-44
Date: May 22, 1972
Classification Number: EN72-007
Section: Engine
Models: A12,L16
Combustion chambers of the 1972 model A12 and L16 engines were redesinged to reduce hydrocarbon emission to a minimum and the configuration of cylinder head gaskets was changed. The opening in the cylinder head gasket at bore location is made smaller in diameter to reduce the quench area to a minimum and thus prevent incomplete combustion of the air-fuel mixture. Because of this change, the correct gasket must be used for replacements on 1972 engines
Beginning Engine Serial Number & Part Number
A12-11044-H3900
L16-203416 11044-N2211
Interchangeability
A12, not interchangeable
L16, 1972 to earlier models, yes, earlier models to 1972, no
Part Numbers
11044-H3925 GASKET-CYLINDER HEAD B110 A12 USA 0671- $57 USD > 11044-H3900
11044-H3901 GASKET-CYLINDER HEAD B210+B310 A12 JAP
11044-H1025 B110 (from '72-5) > 11044-H1000 > 11044-18004
* 11045-H1000 RING "O" (from '72-5)
11044-H1025 B210 from '75-5
11044-H1026
11044-H1027
11044-18004 GASKET-CYLINDER HEAD B10 A10 > 11044-18002 <> 11044-18001 <> 11044-18000
Interchange: A10 PULSAR 1000 BN10 988cc 1978-ON A10 SUNNY 1000 B10,B20 1000 1966-1970 A12 SUNNY 1200 B110,B210,C20 1171cc 1970-73.3 A12 SUNNY 1200 B210 1973.4-75 A10 CHERRY 1000 E10, F10 988 1970.10-73.9 A12 CHERRY 1200 PE10, F10 1171cc 1972-78 A10 SUNNY CAB C20
11044-18004 GASKET-CYLINDER HEAD A12 superceeded
11044-H1000 GASKET-CYLINDER HEAD A12 11044-H1000 GASKET-cylinder head B110, B210 to '75-4 11044-H1025 B210 from '75-5 11044-H1026 11044-H1027 11044-H3900 GASKET-CYLINDER HEAD A12 0671-
fits: A10 PULSAR 1000 BN10 988cc 1978-ON A10 SUNNY 1000 B10,B20 1000 1966-1970 A12 SUNNY 1200 B110,B210,C20 1171cc 1970-73.3 A12 SUNNY 1200 B210 1973.4-75 A10 CHERRY 1000 E10, F10 988 1970.10-73.9 A12 CHERRY 1200 PE10, F10 1171cc 1972-78
11044-H2300 A12GX, A12T
11044-H2301 [thinner?] A12GX, A12T
11044-H2325 A12GX from '72-6
Big Port
11044-H2325 A12 GX from '72-6 > 11044-H2300 * 11045-H2300 RING "O" (from '72-6) 11044-H2301 A12T B210 [thinner?]
Head Set
Nissan 11044-H3926 KIT-GASKET,CYLINDER HEAD 11042-H3927 KIT-GASKET,CYLINDER HEAD
aftermarket Victor HS3602 FEL-Pro HS21181PT ROL HS32060
Head Set gasket kit includes all you need to change the head:
* Cylinder head gasket * Valve stem seals * Rocker cover gasket * Gasket-manifold to cylinder head
it may include the following:
* thermostat gasket * intake-to-exhaust manifold gasket (heat riser gasket) * oil cap packing (gasket) * fuel pump gaskets
Nissan Competition
Nismo head gaskets for Nissan A series motor A12,A13,A14,A15 Engine
11044-M0822 t=0.8 79.0 mm bore diameter
11044-M0823 t=0.6 80.0 mm bore
シリンダーヘッドガスケット
既に生産廃止
Head Set
11044-H3926 KIT-GASKET,CYLINDER HEAD 11042-H3927 KIT-GASKET,CYLINDER HEAD
Head Set gasket includes all you need to change the head:
Cylinder head gasket Valve stem seals Rocker cover gasket Gasket-manifold to cylinder head
it may include the following:
thermostat gasket intake-to-exhaust manifold gasket (heat riser gasket) oil cap packing (gasket) fuel pump gaskets
Gasket Head Set * Victor HS3602 * FEL-Pro HS21181PT * ROL HS32060
GX Metal
Nissan Competition
11044-M0821 COMPETITION HEAD GASKET
Gasket has a bore diameter of 79mm/3.11", an uncrushed thickness of 0.8mm/0.032" and displaces 3.9cc's.
Nismo head gaskets for Nissan A series motor A12,A13,A14,A15 Engine
11044-M0822 t=0.8 79.0 mm bore diameter 11044-M0823 t=0.6 80.0 mm bore
Spacer Gasket
custom order
シリンダーヘッドガスケット