Note. Before proceeding with the procedure, prepare two 6 * 10 mm bolts with a length of 16 - 20 mm.
Valve train components
![](https://www.toyotaman.ru/img/land_cruiser/1156.jpg)
1 — a Cover of the right head of cylinders; 2 - Left cylinder head cover; 3 - O-ring for the guide tube of the candle niche; 4 - Sealing gasket; 5 - Oil pipeline; 6 - Right exhaust camshaft; 7 - Camshaft bearing cap; 8 - Left intake camshaft; 9 - Camshaft gear spring; 10 - Right inlet camshaft; 11 - Retaining ring; 12 - Wavy washer; 13 - Spring-loaded toothed ring; 14 - Camshaft oil seal; 15 - Engine eye; 16 - Left exhaust camshaft; 17 - Right cylinder head with exhaust manifold; 18 - Right head gasket; 19 - Left head gasket; 20 - Left cylinder head with exhaust manifold; 21 - Engine wiring mounting bracket; 22 - Camshaft housing plug; 23 - Segment plugs; 24 - Spark plug; 25 - Engine wiring; 26 - Lambda probe connector (sensor 1, block 2); 27— Lambda probe connector (sensor 1, block 1); 28 - O-ring; 29 - Dipstick for measuring the level of impellent oil; 30 - Cylinder head bolts
Removing
1. Remove cylinder head covers (see Section Bringing the piston of the first cylinder to the top dead center position (TDC)) and timing belt (see Section Removing, checking the condition and installing the gas distribution belt and timing gears) (refer to illustration above).
2. Bring the piston of the first cylinder to the TDC position of the end of the compression stroke.
![](https://www.toyotaman.ru/img/land_cruiser/1157.jpg)
3. The procedure described below applies to all four camshafts. In both heads, the exhaust shaft is always removed first (after locking the spring-loaded toothed ring with pinion), then graduation. First, remove the right cylinder head camshafts. Check the location of the alignment mark on the crankshaft pulley in line with its bolt and intermediate roller (refer to accompanying illustration).
Note. The outer shafts in both heads are outlet, the inner shafts are inlet.
4. Align the service holes by turning the camshaft by its hexagonal part with an open-end wrench. Block the spring-loaded toothed ring on the driven gear with a service bolt, the bolt is threaded into the hole in the ring and screwed into the receiving threaded hole in the gear (refer to the illustration of paragraph 3).
Attention! Due to the fact that the axial play of the camshafts is minimal, try to always keep the assemblies in a horizontal position when removing them, the slightest misalignment can lead to cracks in the head in the area where the gears are located. Before removing the shaft, make sure that the force developed by the torsion spring is fully compensated using the service bolt.
![](https://www.toyotaman.ru/img/land_cruiser/1158.jpg)
5. Set the mark on the camshaft gear at about 10° (refer to the illustration of paragraph 3). Acting strictly in a certain order (refer to accompanying illustration), in several steps (1/4 turn per approach) loosen the camshaft bearing cap bolts enough to allow the bolts to be removed by hand.
Note. Bolts of different sizes are used to fasten the covers - do not mix them up during installation.
6. Remove the oil line, bearing caps and carefully, trying not to warp, remove the camshafts from the cylinder head.
![](https://www.toyotaman.ru/img/land_cruiser/1159.jpg)
7. In the same manner, remove the camshafts from the second cylinder head, taking into account that the dot marks on the camshafts must be aligned (refer to accompanying illustration).
8. Stack the components to be removed from the engine in a strictly organized manner to ensure that they can be reinstalled in their original positions during reassembly.
Note. At this stage, the shims of the valve lifters can be removed using a magnet, which, during assembly, must also be installed strictly in their original places.
9. To remove the gear assembly, clamp the exhaust camshaft by the flats into a soft-jawed vise.
![](https://www.toyotaman.ru/img/land_cruiser/1160.jpg)
10. Using a wrench, turn the gear ring clockwise to remove the force developed by the spring from the service bolt (refer to accompanying illustration), then unscrew the latter by releasing the ring.
Note. If you do not have a wrench handy, insert the second service bolt into the free hole in the gear wheel, and using it as a support, turn the wheel with a screwdriver.
![](https://www.toyotaman.ru/img/land_cruiser/1161.jpg)
11. Using special pliers, remove the retaining ring of the gear assembly (refer to accompanying illustration).
![](https://www.toyotaman.ru/img/land_cruiser/1162.jpg)
12. Remove the wave washer, toothed ring and torsion spring from the shaft stub (refer to accompanying illustration). Make sure that the components removed from the left shaft are stacked separately from the components from the right.
Examination
1. Visually assess the condition of the working surfaces of the cams and bearing journals of the shafts. Pay attention to scratches, cavities, traces of overheating, etc. special attention should be paid to the condition of the surface hardening layer of the cams. Using a micrometer, measure the height of the cams.
2. With a micrometer, measure the diameters of each of the bearing journals of both camshafts. Take measurements at several points spaced as along the length of the neck (for taper detection), and along the generatrix of each section (in order to detect ovality). Record your results. Measure the inside diameter of the camshaft bearings with an inside caliper and record the measurements. Calculate the clearance by subtracting the journal diameter from the journal bearing diameter.
3. Install the camshaft on the prisms and measure the runout of the middle neck using a dial gauge. Compare test results with requirements Specifications, if necessary, replace the worn shaft.
Installation
1. Install the exhaust gear assembly by replacing the torsion spring, toothed ring and wave washer. Fix the assembly with a retaining ring, making sure that the latter is firmly seated.
2. Clamp the shaft assembly in a soft vise.
3. Insert the service bolt into the smooth hole in the gear ring, use a screwdriver to turn the ring clockwise so that the holes align, and screw the second bolt into the gear, firmly tightening the assembly. Remove the first service bolt from the ring. Block the second shaft gear assembly in the same way.
4. Remove old sealant from segment plugs. Apply sealant to the grooves of the plugs and install them in the cylinder heads. Install the right camshafts first.
5. Lubricate the pushers with molybdenum-containing grease and seat them strictly in their original places in the cylinder heads. Make sure that each of the pushers is equipped with its previous adjusting washer.
6. Lubricate the cams, bearing journals and thrust surfaces of the shaft gear with molybdenum grease
![](https://www.toyotaman.ru/img/land_cruiser/1163.jpg)
7. Lay the shafts in their regular places. Turning the camshaft with an open-end wrench, set the dot mark on the shaft at an angle of approximately 10°above the horizontal. Remove the old sealant from the front bearing cover and apply a bead about 1.5mm wide of fresh FIPG sealant to the indicated areas (refer to accompanying illustration). Do not allow sealant to enter cover grooves.
8. Install the cap before the sealant cures. Installing the front cover determines the thrust clearance of the camshaft.
![](https://www.toyotaman.ru/img/land_cruiser/1164.jpg)
9. Install the rest of the covers strictly in their original places (in accordance with the digital marking), make sure that the arrow marks are turned with their points towards the timing drive (refer to accompanying illustration).
10. Install a new camshaft oil seal.
11. Lubricate the threads of the bolts D and E. In order (refer to the illustration of paragraph 9), in several steps (1/4 turn per approach) tighten the cover bolts in several steps to the required torque.
12. Turn out a service bolt.
![](https://www.toyotaman.ru/img/land_cruiser/1165.jpg)
13. Proceeding in a similar manner, install the camshafts of the left cylinder head, taking into account that the dot marks on the camshafts must be aligned (refer to accompanying illustration): Installing the front bearing caps.
![](https://www.toyotaman.ru/img/land_cruiser/1166.jpg)
13. Installing the rest of the bearing caps (refer to accompanying illustration).
14. Check valve clearances (see chapter Vehicle settings and routine maintenance)
15. Install the timing belt (see Section Removing, checking the condition and installing the gas distribution belt and timing gears).
16. Before installing the cylinder head covers, remove the old sealant from them and from the segment plugs. Apply new sealant to the joint between the valve cover and the bearing cap No. 1 of the camshaft. Apply sealant to the center groove of the segment plugs and install them in the cylinder head. Install new gaskets for the cylinder head covers, check the condition of the seals under the cover bolts and install the cylinder head covers.
17. Further installation is carried out in the reverse order to the dismantling of the components.
18. Start the engine and check it for signs of leak development.