Table of contents: Rear crankshaft oil seal -…🠇 Front crankshaft oil seal -…🠇
The procedure for removing the crankshaft was given in the chapter on engine disassembly. The crankshaft has five main bearings. The main and connecting rod journals of the crankshaft can be machined once to a reduced repair size, that is, to fit the repair size liners.
The axial play of the crankshaft is adjusted by installing thrust half rings in the second crankshaft bearing.
The crankshaft is sealed at the front and rear with oil seals. The front oil seal is located in a bolt-on cover, and the rear oil seal is pressed into the engine crankcase and the rear main bearing cover.
Before removing the crankshaft, you should determine the amount of its axial play in order to purchase larger thrust washers if necessary. The procedure for measuring the axial displacement of the crankshaft is as follows.
1. Install a dial indicator on the front side of the cylinder block as shown in illustrations 17.42, and press the crankshaft in the opposite direction with a screwdriver. Reset the dial indicator scale to zero.
2. Press on the crankshaft with a screwdriver from the opposite side and read the dial indicator. The axial displacement value should be between 0.07 and 0.32 mm. Record the measurement result. If it exceeds the permissible wear limit, then during assembly, thrust half rings of increased size must be installed (sometimes only the thrust half rings wear out).
3. Remove the dial indicator.
4. Remove the crankshaft, following the procedure for disassembling the engine.
Please note! We recommend having the journals resurfaced and new bearings installed by a specialized workshop.
The procedure for installing the crankshaft is given in the chapter concerning engine assembly.
Be sure to install both thrust half rings of the same thickness. Observe the specified tightening torque values. Do not forget to rotate the crankshaft to detect any possible jamming during a certain stage of assembly.
Rear crankshaft oil seal - replacement
The rear oil seal can be removed with the flywheel removed. This may be necessary when the clutch begins to slip due to oil penetration from the crankcase.
5. Remove the oil seal from the crankcase using a screwdriver. Proceed carefully to avoid damaging the crankcase or crankcase flange. To make the job easier, you can screw in two self-tapping screws on both sides of the seal, and then, by prying them alternately by the heads, remove the seal.
Check the surface of the crankshaft that mates with the working lip of the oil seal. If, as a result of friction, traces of wear are visible on the surface, then the new oil seal will need to be installed a little deeper into the crankcase.
6. Press the new oil seal into the crankcase using a suitable mandrel. Lubricate the outer surface of the seal with engine oil and the working surface with universal grease. If the surface of the crankshaft on which the oil seal is located is normal, then press the oil seal flush with the surface of the cylinder block. Otherwise, press the seal deeper into the crankcase and make sure that the seal fits tightly over the entire surface.
Front crankshaft oil seal - replacement
The front oil seal is located in a flange in front of the oil pump and can be removed without removing the engine, but requires removal of the timing belt. To remove it, it is better to screw two self-tapping screws into the oil seal and remove it using a screwdriver and pliers. Lubricate the outside of the new seal with engine oil and the working surface with multi-purpose grease. Press the seal flush with the block surface, being careful not to deform it.
Source of the article is website [PEUGEOTBOOK]
24. Gas distribution mechanism drive
Timing drive components can be replaced without removing the engine.
When performing the following work, only partial removal of the timing belt is required, i.e. the belt is removed only from the camshaft toothed pulley:
- removal and installation of the cylinder head;
- removing and installing the camshaft and adjusting valve clearances (1.9-liter engine);
- removal and installation of fuel injection pump.
- Complete removal of the timing belt is necessary when performing the following work:
- removing and installing the oil pump drive and oil pump drive chain;
- replacing the front crankshaft oil seal;
- removing and installing the water pump.