HELP! Injector lash bottomed out even with adjuster screw all the way out on cylinder 5 after head gasket and injector seals job.
Issue Description:
• Main Concern: Injector lash on cylinder 5 is too tight, despite the adjustor screw being fully backed out.
• Symptoms:
o Engine cranks but does not fire.
o The fuel pump primes for a prolonged period, indicating it might not be building sufficient pressure.
o Cylinder 5 injector remains too tight even after replacing washers and reassembling.
Work Already Performed on the Engine:
Here’s a list of all the parts replaced and work that has been done:
1. Head Gasket Replacement:
o Replaced with new head gasket and ensured proper torque sequence and tightening of head bolts.
2. New Head Bolts:
o Replaced old head bolts with new ones during the head gasket replacement process.
3. New Head Dowels
o Replaced factory plastic dowels with steel,
4. Hylomar Sealant:
o Applied between the camshaft carrier and cylinder head to ensure a proper seal.
5. New Intake Manifold Gasket:
o Replaced intake manifold gasket as part of general maintenance and reassembly.
6. New Exhaust Manifold Bolts and Gasket:
o Replaced exhaust manifold bolts and gasket during engine reassembly.
7. New Injector Copper Washers and O-rings:
o Replaced all injector copper washers and O-rings to ensure proper sealing.
8. New Injector Clamp Bolts:
o Replaced injector clamp bolts to ensure injectors are seated correctly.
9. New Rocker Shaft Bolts:
o Replaced rocker shaft bolts to maintain proper valve clearance.
10. New Starter Motor:
o Replaced the starter motor to address starting issues, unrelated to injector problem but part of general maintenance.
11. New Oil Cooler:
• Replaced oil cooler as part of routine maintenance.
11. New Filters:
• Replaced air filter, fuel filter, and oil filter.
12. New Injector Harness:
• Replaced the injector harness to avoid potential electrical issues.
13. New Timing Tensioner Washer:
• Replaced timing tensioner washer during engine assembly.
14. New Sump Gasket:
• Replaced the sump gasket during engine reassembly to prevent leaks.
15. New Fuel Pressure Regulator Gasket:
• Replaced the fuel pressure regulator gasket as part of addressing potential fuel pressure issues.
Troubleshooting and Observations:
1. Injector Lash Issue:
o Injector on cylinder 5 exhibits excessive tightness, despite the adjustor screw being fully backed out.
o Injector lash remains unresolved, suggesting potential issues with the injector or injector seat.
2. Injector Removal & Washer Check:
o After removing the injectors, it was observed that the washer on cylinder 5 did not crush, which might indicate an improper seal or installation.
o Replaced the washers and reinstalled the injectors, but cylinder 5 injector remains tight.
3. Cranking and Fuel Pressure:
o Engine cranks but does not fire.
o Performed the purge cycle (ignition on, press gas pedal five times), but fuel pump continues to prime for an unusually long period, indicating it’s not building enough fuel pressure.
o Checked fuel lines and confirmed fuel is reaching the injectors.
4. Injector Power Test:
o Used the Nanocom to test each injector, confirming that each injector is receiving power.
o Audible click heard from each injector during testing, confirming electrical functionality.
5. Camshaft Alignment Check:
o Confirmed that the camshaft sprocket is correctly aligned based on the numbered markings corresponding with the highest point of the camshaft lobe for the associated cylinder.
6. Cylinder 5 Injector Adjustment:
o Despite adjusting the lash by bottoming out the injector and turning it out one full rotation (per shop manual), injector on cylinder 5 remains too tight.
7. Fuel System Observation:
o Despite the purge cycle being performed, fuel pressure seems inadequate to support proper injector function.
o Need to confirm if the issue lies in the fuel system (fuel pump, fuel pressure regulator, or fuel line blockages).
8. Injector Well Observation:
o During the purge cycle, observed that no fuel pooled out of the injector wells, suggesting that the O-rings on the injectors are sealing correctly and there is no fuel leakage in this area.
Anyone ran into this issue? I’m about to take the injectors out a 3rd time and replace the genuine Land Rover o ring with an after market one to see if that does anything
Issue Description:
• Main Concern: Injector lash on cylinder 5 is too tight, despite the adjustor screw being fully backed out.
• Symptoms:
o Engine cranks but does not fire.
o The fuel pump primes for a prolonged period, indicating it might not be building sufficient pressure.
o Cylinder 5 injector remains too tight even after replacing washers and reassembling.
Work Already Performed on the Engine:
Here’s a list of all the parts replaced and work that has been done:
1. Head Gasket Replacement:
o Replaced with new head gasket and ensured proper torque sequence and tightening of head bolts.
2. New Head Bolts:
o Replaced old head bolts with new ones during the head gasket replacement process.
3. New Head Dowels
o Replaced factory plastic dowels with steel,
4. Hylomar Sealant:
o Applied between the camshaft carrier and cylinder head to ensure a proper seal.
5. New Intake Manifold Gasket:
o Replaced intake manifold gasket as part of general maintenance and reassembly.
6. New Exhaust Manifold Bolts and Gasket:
o Replaced exhaust manifold bolts and gasket during engine reassembly.
7. New Injector Copper Washers and O-rings:
o Replaced all injector copper washers and O-rings to ensure proper sealing.
8. New Injector Clamp Bolts:
o Replaced injector clamp bolts to ensure injectors are seated correctly.
9. New Rocker Shaft Bolts:
o Replaced rocker shaft bolts to maintain proper valve clearance.
10. New Starter Motor:
o Replaced the starter motor to address starting issues, unrelated to injector problem but part of general maintenance.
11. New Oil Cooler:
• Replaced oil cooler as part of routine maintenance.
11. New Filters:
• Replaced air filter, fuel filter, and oil filter.
12. New Injector Harness:
• Replaced the injector harness to avoid potential electrical issues.
13. New Timing Tensioner Washer:
• Replaced timing tensioner washer during engine assembly.
14. New Sump Gasket:
• Replaced the sump gasket during engine reassembly to prevent leaks.
15. New Fuel Pressure Regulator Gasket:
• Replaced the fuel pressure regulator gasket as part of addressing potential fuel pressure issues.
Troubleshooting and Observations:
1. Injector Lash Issue:
o Injector on cylinder 5 exhibits excessive tightness, despite the adjustor screw being fully backed out.
o Injector lash remains unresolved, suggesting potential issues with the injector or injector seat.
2. Injector Removal & Washer Check:
o After removing the injectors, it was observed that the washer on cylinder 5 did not crush, which might indicate an improper seal or installation.
o Replaced the washers and reinstalled the injectors, but cylinder 5 injector remains tight.
3. Cranking and Fuel Pressure:
o Engine cranks but does not fire.
o Performed the purge cycle (ignition on, press gas pedal five times), but fuel pump continues to prime for an unusually long period, indicating it’s not building enough fuel pressure.
o Checked fuel lines and confirmed fuel is reaching the injectors.
4. Injector Power Test:
o Used the Nanocom to test each injector, confirming that each injector is receiving power.
o Audible click heard from each injector during testing, confirming electrical functionality.
5. Camshaft Alignment Check:
o Confirmed that the camshaft sprocket is correctly aligned based on the numbered markings corresponding with the highest point of the camshaft lobe for the associated cylinder.
6. Cylinder 5 Injector Adjustment:
o Despite adjusting the lash by bottoming out the injector and turning it out one full rotation (per shop manual), injector on cylinder 5 remains too tight.
7. Fuel System Observation:
o Despite the purge cycle being performed, fuel pressure seems inadequate to support proper injector function.
o Need to confirm if the issue lies in the fuel system (fuel pump, fuel pressure regulator, or fuel line blockages).
8. Injector Well Observation:
o During the purge cycle, observed that no fuel pooled out of the injector wells, suggesting that the O-rings on the injectors are sealing correctly and there is no fuel leakage in this area.
Anyone ran into this issue? I’m about to take the injectors out a 3rd time and replace the genuine Land Rover o ring with an after market one to see if that does anything
