Finding TDC on a 1996 Audi 2.5L TDI

Vegified TDi

Well-known member
Joined
Dec 3, 2010
Location
Cochrane, Alberta, Canada
TDI
2006 Jetta 1997 Audi Avant Quattro 2.5L
Hello diesel enthusiasts. Can someone guide me on finding TDC on these inline 5 diesel engines please? Is the cylinder closest to the radiator #1? Or is it the cylinder closest to the firewall?

I'm supposing that I may as well pull the valve cover and check in that way...?

I have good compression on only 2 of the 5 cylinders so want to pull the head to find out what's going on. Open to ideas and direction if you have them.

Thanks
 
Last edited:

03Golfer

Active member
Joined
Apr 8, 2020
Location
Canada
TDI
03 Golf
General advice here:

Do you have a service manual for your car?

Cylinder 1 should be the cylinder closest to the front of the engine. Can you pull a glow plug and feel for air coming out or stick a rod down to locate tdc? The most accurate way is to mark the pulley when the rod is 1/4" from topping out, and mark it again when it's coming down to 1/4". Then mark the centre of those 2 marks on the pulley.
But generally the service manual should show a TDC marker, and you could pull the valve cover to see if it's tdc or 360* out.
 
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