JB/T 12043.1-2015Hydraulic timing advance plunger assemblies for diesel engines - Part 1: Specifications (English PDF)

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Technical requirements
• 3.1 Manufacture
• 3.2 Material
• 3.3 Heat treatment
• 3.4 Hardness
• 3.5 Magnetic particle inspection
• 3.6 Surface requirements
• 3.7 Machining requirements
• 3.8 Main geometrical tolerances of the plunger and of the plunger barrel
• 3.9 Surface roughness
• 3.10 Radial sealing
• 3.11 Start of injection
• 3.12 Sliding
• 3.13 Reliability
• 3.14 Trade mark
• 3.15 Service life
• 4 Inspection rules
• 5 Marking, packaging, transport and storage
• Annex A (normative) Sampling inspection of the product quality of the hydraulic timing advance plunger assembly and rules for judging conformity
• A.1 General
• A.2 Sampling inspection rules and sampling scheme
• A.3 Drawing of the sample
• A.4 Assessment of the conformity of the product quality
• Figure 1 Geometrical tolerances of the plunger
• Figure 2 Geometrical tolerances of the plunger barrel
• Figure 3 Geometrical tolerances of the helical top clearance groove plunger construction (developed view)
• Figure 4 Annular top clearance groove plunger construction
• Figure 5 Developed view of the load timing advance plunger construction
• Figure 6 Small bore throttling plunger barrel construction
• Table 1 Main geometrical tolerances of the plunger and of the plunger barrel
• Table 2 Radial sealing values of the plunger assembly
• Table 3 Advance of the start of injection of the fuel injection system
• Table 4 Reliability quality indices of the plunger assembly