Linhai HY740STL 2018 Service Manual page 113

CHAPTER 3 ENGINE
3.18.2 INJECTOR
3.18.2.1 Appearance
The figure below shows the standard Multec 3 Fuel Injector appearance
3.18.2.2 Sealrings
Seal rings for injectors (refer to Figure 12) are made to withstand temperatures
ranging from -40℃ to 150℃ (-40 to 302℉) without leakage or seeping. They must also be
resistant to varying amounts of fuel additives to fuel (i.e., ethanol, etc.). The following are
currently available seal rings designs. Please contact a Delphi representative if the specific
sealing requirements are not met by these designs:
Injector to fuel rail seal ring
• Dimensions:
• ID. : 6.35 mm
• OD. : 14.85 mm
• Cross-section: 4.25 mm
• Materials
• Viton GLT (blue color). For low temperature applications
• Viton A (black). All other applications.
Injector to manifold
• Dimensions:
• ID: 9.61 mm
• OD: 14.49 mm
• Cross-section: 2.44 mm
• Materials:
• Viton A (black or brown other applications.)
3.18.2.3 Sealrings replacement
Lubricate the seal rings with an approved lubricant or equivalent. The lubricant application
process must prevent lubricant from contacting the director plate, which could possibly restrict
the injector flow.
It is preferred to not reuse the seal rings when re-installing an injector. If re-use is necessary,
carefully inspect each seal ring for any signs of damage, as even minor defects can lead to fuel
/ vacuum leakage. Always install injectors and seal rings using the recommended service
procedures to avoid the possibility of a safety hazard.
When installing seal rings to the injector inlet, take extra care not to damage the seal on the
injector top flange.
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3- 82