What is the valve clearance for the Foton Cummins 3.8 engine?
4 Answers
Intake valve clearance is 0.10~0.15mm, exhaust valve clearance is 0.15~0.20mm. Below are specific details about Foton Cummins: 1. Overview: Foton Cummins is a 50:50 joint venture between U.S.-based independent diesel engine manufacturer Cummins Inc. and Chinese commercial vehicle company Beiqi Foton Motor Co., Ltd. It primarily produces light, medium, and heavy-duty diesel engines, with headquarters located in Changping District, Beijing. 2. Products: Foton Cummins engines comply with Euro V (China V) and Euro VI (China VI) emission standards, as well as global non-road Stage IV requirements. Engine displacement ranges from 2.8 liters to 13 liters, spanning the F series to X series.
Just helped my cousin adjust the valves on a Foton Cummins 3.8 engine two days ago. For this diesel engine, the intake valve clearance should be 0.30 mm and the exhaust valve 0.60 mm when cold. Remember to always perform this operation on a cold engine - thermal expansion will throw off the measurements. When using a feeler gauge, slight resistance is ideal. After adjustment, rotate the crankshaft two full turns and recheck, otherwise incorrect camshaft positioning will waste your effort. The V-type engine has left and right cylinder banks - after finishing one side, remember to rotate to the opposite bank. Bolts require 10 N·m torque applied in three stages. Finally, start the engine and listen: normal ticking is fine, but metal scraping indicates valves are too tight.
The valve clearance adjustment for the Foton Cummins ISF3.8 engine is divided into cold and hot engine states. The standard cold engine values are: intake valve 0.30mm and exhaust valve 0.60mm. In actual operation, prepare a combination of thin and thick feeler gauges. First loosen the lock nut, then rotate the adjustment screw. Important reminder—after adjusting each cylinder, manually rotate the crankshaft 720 degrees, wait until the valves of that cylinder are fully closed, and then measure again to avoid false clearance caused by the cam lifting. For adjustment tools, using an open-end wrench with a magnetic screwdriver is more convenient. After adjustment, tighten with a torque wrench at 9-11N·m. It is recommended to check every 50,000 kilometers. Excessive wear of the valve stem may result in poor acceleration performance.
As an experienced repair shop technician, I've handled hundreds of Foton Cummins 3.8 engines. Remember these standard measurements: cold engine intake valve clearance 0.30±0.03mm, exhaust valve clearance 0.60±0.05mm. Key operation points: 1 Clean valve chamber sand particles after removing decorative cover 2 Hold adjustment screw to prevent displacement when loosening lock nut 3 Slight resistance when inserting and pulling feeler gauge indicates optimal adjustment 4 Adjust only one cylinder at a time following firing order 1-3-4-2. Common mistakes include forcing thick feeler gauge resulting in oversized clearance, and apprentices forgetting to install sealing rings causing oil leaks.
