Diesel engines normally do not have timing marks.Depending upon the age of your vehicle,the crankshaft is sometimes locked in position at 6.00 o clock,that's underneath.There is a plate normally held with bolts,behind it you may find a pointer,if so there is also a mark on the flywheel which should be positioned to the pin.The fuel pump needs a pin to locate and secure it,there is also a timing mark on it normally at 12 00 o clock position,the mark must be exactly in line when belt fitted,any deviation at all the engine will not run correctly. Finally, the camshaft is either set in the correct position by taking off the vacuum pump and locating a special key to lock in place the camshaft,or the rocker cover is removed and a DTI is used to position the camshaft lobe in the correct position. This type of work is for an EXPERT, do not attempt it without the correct tools,if you are not confident, leave it to an entrusted professional. Please note what I have said, Diesel Engines Do Not Normally have Timing Marks, this is very dependant upon the age of your engine
To start timing on the 2C Turbo diesel engine, you will have to locate or distinguish camshaft timing marks.
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Timing belt changing is not part of routine maintenance for a vehicle, including an Astra GSI Turbo. A timing belt is to be left alone unless a problem arises with the timing in the engine.
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