Overview
ISO 7030:1987 - "Road vehicles - Screw-mounted injection nozzle holders, types 12–19" defines the dimensional requirements for screw-mounted injection nozzle holders used in diesel (compression‑ignition) engines. This second edition (1987) supersedes the 1981 edition and provides standardized shapes, reference dimensions and tolerances needed to ensure correct mounting and interchangeability of nozzle holders. The standard does not define the locations of fuel inlet or leak‑off connections because these vary by application. Nozzle holders types 12 and 13 are explicitly intended for use with the nozzles specified in ISO 2697.
Key topics and technical requirements
- Scope: Specifies dimensions and tolerances for screw‑mounted nozzle holders for diesel engines (types 12–19).
- Dimensional drawings and figures: Illustrative figures show external shape, reference planes and critical reference quantities for each holder type.
- Tolerances: Nominal dimensions and manufacturing tolerances are provided to support consistent fit, sealing and cooling clearances.
- Preferred shank lengths: The standard lists preferred shank length ranges and their tolerances to aid design and manufacturing.
- Compatibility note: Types 12 and 13 are matched to ISO 2697 nozzles; types 14 and 15 may also be compatible with those nozzles.
- Design freedom: The standard deliberately leaves fuel inlet and leak‑off connection locations unspecified to allow variation by engine layout and supplier needs.
Practical applications
- Ensures interchangeability of nozzle holders across engine models and suppliers, reducing design rework and simplifying spare parts logistics.
- Guides engine cylinder head designers and fuel injection system engineers in specifying mounting interfaces and clearances.
- Used by injector manufacturers and OEMs for tooling, inspection and quality control to meet consistent dimensional requirements.
- Supports aftermarket parts suppliers and repair workshops to source correctly dimensioned nozzle holders for maintenance and overhaul.
- Helps manufacturing engineers when setting up machining, assembly fixtures and inspection plans.
Who should use this standard
- Automotive and heavy‑duty diesel engine manufacturers
- Fuel injection component designers and suppliers
- Cylinder head and engine assembly engineers
- Quality assurance and metrology teams
- Aftermarket and service organizations
Related standards
- ISO 2697 - referenced for compatible fuel injection nozzles (size "S").
- ISO 7030 is prepared under ISO/TC 22 (Road vehicles) and should be used in conjunction with other engine and fuel‑system standards as relevant.
Keywords: ISO 7030:1987, screw-mounted injection nozzle holders, diesel engines, nozzle holder dimensions, tolerances, nozzle types 12–19, ISO 2697, shank lengths, fuel injector mounting.
Open preview (PDF)Road vehicles — Screw-mounted injection nozzle holders, types 12, 13, 14, 15, 16, 17, 18 and 19
