Autopapyrus · Haval M6 1.5 Turbo (2026)
https://autopapyrus.com/guides/haval/m6/checking-and-adjusting-valve-lash-valve-clearance/
https://autopapyrus.com/guides/haval/m6/checking-and-adjusting-valve-lash-valve-clearance/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.
Haval M6 1.5 Turbo (2026): Checking and Adjusting Valve Lash (Valve Clearance)
The exact adjustment procedure for this engine is not documented in publicly available service materials, so the general principle is given below. Valve trains come either with hydraulic lash adjusters, where the clearance is not adjustable, or with a mechanical design, where shims or lifters must be selected. First determine the valve train type, and only then disassemble the engine. Check the nominal clearances and tightening torques against the manufacturer's service manual.
Parts
3| № | Part |
|---|---|
| 01 | Valve cover gasket, 1.5 Turbo engine (with spark plug well seals) |
| 02 | Valve adjusting shims or lifters of required thicknessselected based on clearance measurements |
| 03 | Engine oilfor topping off if needed |
Tools
9- Torque wrench
- feeler gauge set
- crankshaft turning wrench
- socket set
- camshaft locking tools (if required by the design)
- lifter/bucket removal tool or a special tool for rocker arms
- new valve cover gasket
- sealant
- drain pan and clean rags
Step by step
12 steps- Determine whether the procedure is needed. On most modern turbo engines in this class, valve lash is not subject to scheduled adjustment. If the valve train uses hydraulic lash adjusters, there is nothing to adjust. In that case, a knocking or ticking noise is fixed by diagnosing the lash adjusters, oil pressure and oil quality, not by selecting clearances. The procedure is needed only with a mechanical valve train, with a characteristic valve tapping noise, or with a loss of compression.
- The engine must be completely cold, with at least 3-4 hours of rest. Clearances are measured at about 20 °C. Disconnect the negative battery terminal.
- Remove the decorative engine cover, disconnect the ignition coil connectors and any wiring harnesses that interfere with access. Remove the coils. To make turning the engine easier, you can remove the spark plugs, but first clean the wells of dirt so it doesn't fall into the cylinders.
- Remove the hoses and crankcase ventilation hoses that interfere with removing the valve cover. Loosen the cover bolts working from the edges toward the center, then carefully lift off the cover without prying at the sealing surface with a screwdriver.
- Set the piston of cylinder 1 to TDC on the compression stroke. Turn the crankshaft only in its normal direction of rotation using the pulley bolt until the camshaft marks line up with their reference marks. On engines with a chain drive, check the marks strictly against the manufacturer's diagram. Do not turn the crankshaft backward, as the chain may jump a tooth.
- Use a feeler gauge to measure the clearance at each valve whose cam lobe is pointing away from the lifter. Record the values by cylinder, separately for intake and exhaust valves. The feeler gauge should slide with slight drag. Compare the values with the tolerance in the service manual. Intake and exhaust valves have different tolerances; as a rule, the exhaust clearance is larger.
- Turn the crankshaft to the required angle and measure the clearances of the remaining valves one by one. Mark which valves are out of tolerance.
- For valves out of tolerance, calculate the thickness of the adjusting element. The new thickness equals the old thickness plus the measured clearance minus the target clearance. To do this, remove the shim or lifter while holding the valve and camshaft with a special tool, and measure it with a micrometer. Do not pull elements out blindly, and do not mix up their positions.
- Install the selected elements, lubricate them with clean engine oil, turn the engine through 2 full revolutions and recheck all clearances. Repeat the selection if necessary.
- Clean the cylinder head and valve cover mating surfaces of old sealant and oil, and degrease them. Install a new gasket and apply sealant at the half-moon joints and at the locations specified by the manufacturer.
- Install the valve cover and tighten the bolts evenly from the center toward the edges in several passes. The valve cover bolt torque for engines like this is usually low, about 8-12 N·m (6-9 lb-ft); take the exact value from the service manual. Tighten the spark plugs to the specified torque, usually 20-30 N·m (15-22 lb-ft), and secure the coils with their original bolts.
- Reconnect the hoses, connectors and the battery. Start the engine, warm it up and check for oil leaks around the perimeter of the cover and for any unusual noises. Read the trouble codes through the diagnostic port and clear any codes caused by disconnecting the battery.
Common mistakes and warnings
- On an engine with a timing chain drive, an incorrect crankshaft and camshaft position while turning the engine or installing the cover can cause the chain to jump and the valves to hit the pistons
- Do not begin the work without confirming the valve train type and the exact clearance values from the service manual
- If you have no experience with timing system repairs, leave the job to a repair shop
- If the noise comes from hydraulic lash adjusters, adjustment will not help; the oil system will need to be diagnosed and the lash adjusters replaced