Basic steps to replace a crankshaft oil seal of the VAG Group


AJUSA explains step by step how to disassembly and assembly the crankshaft oil seal on the VAG Group engines.


The oil seal crankshaft is one of the most important parts, we find in cars and industrial vehicles. Some models of the VAG Group (indicated below) have a PTFE housing or integrated cover to improve the quality of the sealing.



1.4 TDI, 1.9 TDI


1.4 FSI , 1.6 , 1.6 FSI , 1.8 20v , 2.0 , 2.0 TSI , 2.0 FSI , 2.0 TFSI


Over time, the oil seals deteriorate and the engine loses oil. In these cases, it is necessary to replace the oil seal. AJUSA explains the basic steps that must be followed to repair the oil seal crankshaft.



1. Drain engine oil

2.  Remove bolts of the oil pan and disassembly oil pan, remove seal bolts from the block.

3.  To remove the seal without damaging the crankshaft or the block surface, use three M6 screws and introduce them in the threaded holes in the seal.

4.  Once the seal has been removed, clean the crankshaft axis and check it is not damaged; if it were damaged, repair would be needed, since a small defect in the axis will cause an oil leak.



1.  Do not remove the seal out of its protecting cover to avoid dirtiness or dust. Do not manipulate the sealing lip. 

2.  This type of PTFE seal is supplied with a plastic shell, which as well as protecting the lip it is also good as applicator for the seal assembly. Without the applicator, the tight tool must be used. 

3.  Once the lip has been positioned and aligned, push the housing uniformly until it gets in touch with the block surface and the dowel pins fit in the seal holes.

4.  Tighten the seal bolts with the engine block at specified torque.

5.  Clean the surfaces off oil and sealant of the previous assembly, both in the block and oil pan and apply a new silicone cord without covering the bolts holes, always in the inner side.

6.  Assembly the oil pan in the engine and tighten bolts at specified torque.






- The cord of sealant must be around 3 mm to prevent the excess of material gets into the oil pan, obstructing the vacuum pipe of the oil pum

- After applying sealant (Ajusil), put together the oil pan to the block before sealant begins getting harder (10 min. approx)

- Do not lube with oil or grease on the crankshaft axis or seal lip; surfaces on both sides must be totally dry.

- The crankshaft surface must be in perfect conditions, otherwise it must be rebuilt by an expert technician.

- In order the seal PTFE lip adapt to the crankshaft shape for the right sealing, engine must not be started until 4 hours after the seal assembly.

- The rubber coating on the base of the seal, does not seal by itself, so it is necessary in every case to use additional sealant or oil pan gasket to assure the complete sealing in that area.




INTERESTING: The assembly of the oil feed pipe 

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