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| Revision as of 02:55, 21 November 2015 ddgonzal (Talk | contribs) (->Photo Index) <- Previous diff |
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| * 13203-H1000 SPRING-valve, outer ALL except GX | * 13203-H1000 SPRING-valve, outer ALL except GX | ||
| * 13205-18000 SEAT-valve spring ALL except GX | * 13205-18000 SEAT-valve spring ALL except GX | ||
| - | * 13209-H2301 RETAINER-valve spring ALL | + | * 13209-H2301 RETAINER-valve spring ALL [all after 1973] |
| * 13210-73400 COLLET-valve | * 13210-73400 COLLET-valve | ||
| * 13210-H1000 COLLET-valve (from 72-2) | * 13210-H1000 COLLET-valve (from 72-2) | ||
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| * 13203-H2301 SPRING-valve, inner GX | * 13203-H2301 SPRING-valve, inner GX | ||
| * 13205-H2300 SEAT-valve spring GX | * 13205-H2300 SEAT-valve spring GX | ||
| + | [http://datsun1200.com/modules/newbb/viewtopic.php?post_id=474291#forumpost474291 http://datsun1200.com/uploads/newbb/174_5666a42e95c11.jpg] | ||
| = Valves & Seals = | = Valves & Seals = | ||
Revision as of 09:47, 8 December 2015
The A12 engine in the Datsun 1200 uses traditional coil springs for each valve. The A12GX Engine uses dual springs on each valve.
Contents |
Specs and Testing
* Free Length: 46.5 mm (1.831 in) * Valve Closed: 38.7 mm at 23.9 kg (1.524 in at 52.7 lb) * Valve Open: 30.2 mm at 58.5 kg (1.19 in at 129 lb)
- Measure the free length and the tension of each spring. If the measured value exceeds the specified limit, replace the spring.
- Check each spring for deformation with a square. Any springs with a deflection of 1.6 mm (0.0630 in) or more must be replaced.
Part Numbers
Nissan Part Numbers * 13203-H1000 SPRING-valve, outer ALL except GX * 13205-18000 SEAT-valve spring ALL except GX * 13209-H2301 RETAINER-valve spring ALL [all after 1973] * 13210-73400 COLLET-valve * 13210-H1000 COLLET-valve (from 72-2) * 13210-U0100 COLLET-valve (from 71-10) ** All three collet PNs interchange * 13219-H1000 SHROUD-valve, inner ALL except GX
GX-specific
* 13203-H2300 SPRING-valve, outer GX
* 13203-H2301 SPRING-valve, inner GX
* 13205-H2300 SEAT-valve spring GX
Valves & Seals
See main article: Valves
Racing Valve Springs
For RPMs in excess of stock (higher than 6400 RPM) use racing valve springs
* Stock springs are good to 6000 rpm * Factory GX springs are good to 6400 rpm * Tomei * Iskenderian 455-JA-006 needs dual spring retainers, MAX RPM 10,000
Photo Index
