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Octavia Tdi timing help needed

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  • Author

No paint on the pump  I think you're on the money!

  • Author

I cant post a photo but I took the pump off. There is no paint and no resistance where there should be at TDC on the pump. I am bringing it to be checked later on, anyone know how much they charge for this? Thanks for all the replies

I doubt it is the pump.

Before you do anything else...

1. Put the pin in the pump, making sure it is the hole.

2. Turn the crankshaft to TDC.

3. Turn the camshaft so the lobes are up on the cylinder closest to the belt and the slot at the vacuum pump is horizontal so the lock bar can be installed.

4. Put the belt back on and tension it.

You should then turn over the engine by hand so that the camshaft turns a complete revolution (the crankshaft will turn two revolutions). If all is OK, then engine should run.

  • Author

I doubt it is the pump.

Before you do anything else...

1. Put the pin in the pump, making sure it is the hole.

2. Turn the crankshaft to TDC.

3. Turn the camshaft so the lobes are up on the cylinder closest to the belt and the slot at the vacuum pump is horizontal so the lock bar can be installed.

4. Put the belt back on and tension it.

You should then turn over the engine by hand so that the camshaft turns a complete revolution (the crankshaft will turn two revolutions). If all is OK, then engine should run.

Hi, I did as you suggested when I changed the belt. She wouldn't start or even fire. As the OP suggested the pump has the paint missing from the centre nut. I rang a diesel engineer he said he can easily check and reset the pump. He wouldn't give a price over the phone.

Hi, I did as you suggested when I changed the belt. She wouldn't start or even fire. As the OP suggested the pump has the paint missing from the centre nut. I rang a diesel engineer he said he can easily check and reset the pump. He wouldn't give a price over the phone.

It wouldn't fire because you were 180° out. There are two positions of the camshaft that correspond to TDC on the crankshaft (as it's a four stroke engine) and you locked the crank/cam at the wrong one. Unfortunately, it's possible to insert the locking bar in both positions :( AIUI, you then moved the pump 180° from 7 o'clock to 1 o'clock. This is the problem. If you had left it at 7 o'clock or rotated the crank another rev until TDC appeared again (and the hole would be at 1 o'clock) all would have been OK. After all it was running fine before you changed the belt.

Counting from the belt end, which cylinder has the injector with the needle lift sensor?

  • Author

I took the pump to a diesel engineer it was out almost 180 degrees. I'm a little poorer now but the car should live another while! Many thanks for all the replies

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