Compression test
Note: In case of loss of power, increased fuel consumption or increased oil consumption, it is necessary to check the compression in the engine cylinders.
1. Warm up and stop the engine. Warm up the engine to normal operating temperature.
2. Disconnect ignition coil connectors (IN) and nozzles (A).
3. Remove ignition coils (A).
4. Remove the 4 spark plugs using a 16mm special wrench.
5. Check up a compression in each cylinder.
Install a compression gauge in the spark plug hole.
Open full throttle.
Cranking the crankshaft with a starter, measure the compression.
Note: Make sure the battery is fully charged to ensure 200 rpm.
Repeat the above operations for each cylinder.
Note:
- The compression test should be done in as little time as possible.
- Standard compression value: 1283 kPa.
- Minimum allowable value: 1135 kPa.
- The difference between the compression of each of the cylinders: no more than 100 kPa.
If there is insufficient compression in one or more cylinders, pour a small amount of engine oil through the spark plug hole into the cylinder and repeat steps 1 to 3.
If the compression has increased, then the compression rings are damaged or the piston has increased wear.
If the compression has not changed, then the valve seats are probably damaged or the valve does not sit properly. Damage to the cylinder head gasket may also be a possible cause.
6. Screw in the spark plugs.
7. Install ignition coils.
8. Connect sockets of atomizers and coils of ignition.
Checking and adjusting valve clearance
Note: Valve clearance must be checked and adjusted on a cold engine (coolant temperature 20°C), with the cylinder head installed on the block.
1. Remove the cylinder head cover.
2. Set the piston of the first cylinder to the position of top dead center on the compression stroke. For this:
Rotate the crankshaft pulley and align the notch on the pulley with the mark «T» on the timing chain cover as shown in the illustration.
Make sure the mark on the camshaft sprocket is (A) is in line with the plane of the cylinder head. If not, rotate the crankshaft 360°.
3. Check the valve clearance.
(1) Check only the intake valve clearances of the 1st and 2nd cylinders, as well as the clearances of the exhaust valves of the 1st and 3rd cylinders.
Using a feeler gauge, measure the clearance between the tappet and the main circumference of the camshaft.
Note: Valve clearance specification (engine temperature: 20°C):
- Maximum allowable value:
- Inlet valves: 0.10~0.30mm.
- Exhaust valves: 0.20~0.40mm.
(2) Rotate the crankshaft pulley one turn (360°clockwise) and align its groove with the mark on the timing chain cover.
(3) Check the intake valve clearances of the 3rd and 4th cylinders, as well as the clearances of the exhaust valves of the 2nd and 4th cylinders.
4. Adjust the intake and exhaust valve clearance.
(1) Move cylinder #1 to top dead center on the compression stroke.
(2) Mark the timing chain links (in 2 locations), so that they match the marks on the intake and exhaust camshaft sprockets.
(3) Remove the bolt from the service hole in the timing chain cover.
Attention. Do not reuse a loose bolt.
(4) Insert thin pin (A) (09240-2G000) into the service hole of the timing chain cover and release the ratchet.
(5) Remove the front bearing cap (A) camshafts.
(6) Remove the exhaust camshaft bearing caps and exhaust camshaft.
17) Remove the intake camshaft bearing caps and intake camshaft.
Attention. Hold the timing chain while removing it from the camshaft sprocket.
(8) Tie the timing chain with thread.
Attention. Keep foreign objects out of the timing chain cover.
(9) Measure the thickness of the removed pusher with a micrometer.
(10) Calculate the thickness of the new tappet so that the valve clearance is within specification.
valve clearance (engine temperature: 20°C).
T: thickness of the removed pusher.
A: Measured valve clearance. N: Thickness of the new pushrod. Inlet: N= T + [A - 0.20mm]. Graduation: N = T + [A-0.30mm].
(11) Select a new plunger with a thickness as close as possible to the calculated value.
Note: Shims 47 can be used in various sizes in 0.015 mm increments from 3.00 mm to 3.69 mm.
(12) Establish a new pusher in a head of the block of cylinders.
(13) While holding the timing chain, install the intake camshaft and phase shifter.
(14) Align the marks on the timing chain with the marks on the camshaft sprocket.
(15) Install the exhaust camshaft.
(16) Install the exhaust camshaft sprocket.
(17) Install the front bearing cap.
Note: Tightening torque: 14.7 Nm.
(18) Tighten the service port bolt.
Note: Tightening torque: 11.8 ~ 14.7 Nm.
(19) Rotate the crankshaft 2 turns clockwise and realign the marks (A) crankshaft sprockets and camshaft sprockets.
(20) Check the valve clearance.
Note:
- valve clearance (at engine coolant temperature: 20°С).
- Intake: 0.17 ~ 0.23mm.
- Graduation: 0.27 ~ 0.33mm.