Pic. 2.238. Camshaft components
Disassembly
Drain the coolant. Remove the engine cover and intake manifold.
Disconnect the positive crankcase ventilation hose and disconnect the engine wiring harness connector.
Remove the accessory drive belt. Remove the power steering pump, A/C compressor, crankshaft, tensioner and idler pulleys.
Remove the timing belt cover.
Remove the automatic timing belt tensioner.
Remove the belt from the camshaft sprockets.
Remove the high voltage wires.
Pic. 2.239. Valve covers
Remove valve covers (pic. 2.239).
Remove the camshaft sprockets (under the timing belt).
Pic. 2.240. Camshafts
Loosen the camshaft bearing cap bolts (pic. 2.240).
Pic. 2.241. Removing camshafts
Remove bearing caps and camshafts (pic. 2.241).
Examination
Check the camshaft journals for wear. If the shaft journals are significantly worn, replace the camshaft.
Pic. 2.242. Measuring the height of the camshaft cams
Check the tops of the camshaft cams for damage. If the shaft cams are damaged or their wear exceeds the allowable value, then replace the camshaft (pic. 2.242).
Camshaft lobe height.
Rated value:
- inlet - 43.95-44.15 mm;
- outlet - 43.95-44.15 mm.
Maximum allowable value:
- intake and exhaust - 43.45 mm.
Check up a condition of a nape of a cam. Replace the camshaft if damaged or worn.
Check up a condition of beds of camshafts in a head of cylinders. If there is significant damage or wear, replace the cylinder head assembly. Measure the camshaft end play.
Axial clearance: 0.10–0.15 mm.
Front camshaft oil seal
Check the condition of the sealing lip of the stuffing box. Replace seal if necessary.
Check up a condition of a neck of a camshaft under installation of an epiploon. If there is a wear groove, replace the camshaft.
Hydraulic pusher
Pic. 2.243. Scheme of actions when filling the pusher small
Fill the tappet with oil. By creating an emphasis on the surface «A» put your hand on the ledge «IN» (pic. 2.243). If there is movement, replace the pusher. Other characteristic malfunctions of the hydraulic compensator are given in table 2.13.
Timing Chain Check
Pic. 2.244. Timing chain
Check circuit elements (bushings and plates) for no wear. Replace chain if wear is excessive (pic. 2.244).
Installation
Reinstall the hydraulic lifters.
Align the timing chain with the chain sprockets of the intake and exhaust camshafts.
Lubricate the camshaft bearing journals with engine oil, then install the camshaft in place.
Note. Before installation, check the pressing force of the intake camshaft sprocket. At room temperature, the force should be above 1000 kg.
Pic. 2.245. Identification marks on bearing caps
Install the camshaft bearing caps. The identification marks on the bearing caps are used to identify the location of the cap installation (intake/exhaust valve side) (pic. 2.245).
I: intake camshaft.
E: exhaust camshaft.
Tighten the camshaft bearing cap bolts to a nominal torque in two or three steps.
Tightening torque for the camshaft bearing cap bolts: M10 - 14-16 Nm, M7 - 10-12 Nm.
Pic. 2.246. Pressing in the camshaft seal
With a special tool (mandrel for installing the camshaft oil seal: 09221-21000) press in the camshaft seal. Lubricate the sealing lip of the oil seal with engine oil (pic. 2.246).
Slide the oil seal onto the camshaft from the timing belt sprocket side, then install the oil seal until it stops with a hammer on the mandrel.
Pic. 2.247. Camshaft sprocket installation
Install the camshaft sprockets and tighten the fastening bolts to the rated torque (pic. 2.247).
The moment of an inhaling of bolts of fastening of an asterisk of a camshaft: 90–110 Н·м.
Install the valve cover.
The moment of an inhaling of bolts of fastening of a valvate cover: 5–6 Н·м.
Valve cover tightening procedure
Pic. 2.248. The procedure for tightening the valve cover bolts
Tighten bolts in sequence 1, 2, 3, 4, 5, 6, 7, 8 to half torque (pic. 2.248).
Tighten all bolts to rated torque.
Install high voltage wires and center cover.
Install the timing belt and auto tensioner.
Install the timing belt covers.
Install the power steering pump, A/C compressor, crankshaft, tensioner and idler pulleys. Put on the accessory drive belt.
Connect the positive crankcase breather hose and engine harness connector.
Install the intake manifold and engine cover.