M43TU engine
Asterisks
1. Removal of sprockets is described in paragraph 7 as part of the chain removal procedure.
Tensioner
2. Set the engine to TDC #1 and lock the crankshaft as described in paragraph 3.
3. Remove the chain covers as described in paragraph 6.
4. Press the bottom end of the tensioner shoe to loosen the chain and sink the tensioner plunger until the groove on the plunger aligns with the hole in the tensioner body. Lock the plunger in this position by inserting a rod or drill of suitable diameter into the hole and groove.
5. Turn out bolts of fastening of the case of a tensioner and remove it from the engine (pic. 8.5).
6. Do not remove the rod from the tensioner until the tensioner is in place. Do not try to disassemble the tensioner - you need a special proprietary tool to assemble it.
7. If a new tensioner is purchased, it is also fixed in the depressed position. Do not pull out the retainer until the tensioner is in place.
8. Installation is carried out in the reverse order of removal, taking into account the following notes.
- A) Check the condition of the O-ring and replace it if necessary.
- b) Do not pull out the retainer until the tensioner is in place.
- V) Install the chain covers as indicated in paragraph 6.
N42 engine
Asterisks
9. Removal of sprockets is described in paragraph 7 as part of the chain removal procedure.
Tensioner
10. The hydraulic chain tensioner acts on the right guide shoe. Remove tensioner assembly (see fig. 7.29). Get ready for oil to pour out of the hole. During reassembly, the o-ring will need to be replaced.
11. If the tensioner plunger needs to be replaced, hold the assembly vertically with the hex head down. Press down on the plunger to squeeze all the oil out of the body. If necessary, repeat the procedure.
12. Replace the O-ring and screw the assembly into place. Tighten the plug to the required torque.