Here is the DIY for adjusting valve lash clearance (Tappets) in Khyber G10 6Valve engine.
1. Basic Concept
There are two types of valves inlet and outlet. The upper three are the inlet ones and the ones below near the exhaust pipe are the outlet.
There are three cylinders in Khyber G-10 engine. Each cylinder has one spark plug and two valves (one inlet and one outlet) . Cylinder no.1 is near the timing belt side and no.2 is in the middle and no.3 is on the distributor side. The spark sequence is 3 – 2 – 1 .
The valve lash clearance is to be set cylinder wise and in sequence of spark.
The valves open and close with help of the cam shaft and rocker arms in the following sequence
1. Inlet valve is opened
2. Piston goes down
3. Fuel air mixture is sucked in
4. Inlet valve closed.
5. Piston comes up and compress the mixture (with the force from the previous cylinders combustion)
6. Spark is initiated and mixture ignites
7. Piston goes down
8. Outlet valve opens
2. The tools required
a. 12mm ring
b. Screw driver
c. 10 mm socket
d. Feeler Gauge
3. Procedure
a. Remove the air cleaner assembly
b. Remove the tappet cover with 10mm socket
c. Jack up the car from the front right side (driving side).
d. Put the car in 4th gear.
e. Rotate the wheel till the outlet valve of the 1st cylinder is fully opened (pressed).
f. Check the valve lash clearance of the 3rd cylinder
g. Inlet 0.006 Inch, outlet 0.008 (this setting is applicable when the engine is at 25- 30 C)
h. Adjust with the help of feeler gauge.
i. Loosen up the lock nut by the 12mm ring.
ii. Put the appropriate gauge between the tip of the adjustment screw and the valve stem.
iii. tighten/loosen up the adjustment screw in a way that when feeler gauge is swiped between the valve and screw its not loose nor too tight. it should pass touching both ends without gap.
iv. When you are sure of the clearance tighten up the lock nut.
v. You are done with one cylinder.
i. Rotate the wheel till the outlet valve of cylinder 3 is fully opened (Pressed)
j. Check the valve lash clearance of the 2nd cylinder.
k. Repeat “h” according to ‘g’.
l. Rotate the wheel manually till the outlet valve of cylinder 2 is fully opened (Pressed)
m. Check the valve lash clearance of the 1st cylinder.
n. Repeat “h” according to ‘g’.
- Replace the tappet cover and air cleaner.
- Start the engine and check for any abnormal sound or behavior.
- This is one way to do it. I mentioned this coz this method is easier to explain in words others are quicker but need video support to understand.
Hope this helped. Any question is welcomed.
(Sorry for No pictorial support)