"Fun" with Flywheel TDC marks

[UrS4boy]

Some Audi flywheels, like this AAR flywheel, were nicely marked with a "0" for top dead center that you used during cam timing by splitting the "0" in the crank timing window:



With the AANs, they degraded the marking to a single line, difficult to see



On the final closeout batch of AAN Dual Mass Flywheels, LUK apparently just gave up, with the result being this mess (Thanks for nothing):



Bottomline: The only way to safely determine where TDC is is to use the front crank pulley mark to ball park TDC and then to remove the No.1 plug and put a length of dowel into No.1 and "rock" the engine (perhaps off the cam sprocket) to get exactly TDC.

[_ShurikeN]

An alternative and probably better option is to take a reference flywheel and make a proper mark on your flywheel yourself (chisel+paint).

[Rusty]

If you're in any doubt, the best way to tell TDC is to pus something that won't damage anything down the spark plug hole and watch it rise and then stop

[A1QSHIP]

I would stay away from the camshaft sprocket or affixment bolt when rocking the motor. Gear is fragile & you might damage the shutter wheel or inadvertently break or loosen the camshaft bolt. (Ask me how I know). Use the crankshaft bolt to turn the engine or rock the engine by moving the vehicle while in gear.

[hunker7]

When I said I don't have '0' marking no one believed me

[maiks]

If you're in any doubt, the best way to tell TDC is to put something that won't damage anything down the spark plug hole and watch it rise and then stop


I use this method also, the simpliest way. I have tried to find the mark on flywheel but no results. (Just to be clear - we are talking about the first spark plug hole)

[UrS4boy]

If you're in any doubt, the best way to tell TDC is to pus something that won't damage anything down the spark plug hole and watch it rise and then stop

Umm...I thought I said that

Bottomline: [/B]The only way to safely determine where TDC is is to use the front crank pulley mark to ball park TDC and then to remove the No.1 plug and put a length of dowel into No.1 and "rock" the engine (perhaps off the cam sprocket) to get exactly TDC.

Okay, maybe NOT off the cam sprocket.

[UrS4boy]

Update: Found the timing mark on NIB AAN DMFW

Not sure why the literature says the G4 is 62 degrees away from the TDC mark (= 62/360 x 135 = 23.25 teeth). It's actually at 38.25 (ish) teeth = 102 degrees. (!!??)

[UrS4boy]

Need 3B flywheel info.

Not sure why the literature says the G4 is 62 degrees away from the TDC mark (= 62/360 x 135 = 23.25 teeth). It's actually at 38.25 (ish) teeth = 102 degrees. (!!??)

Anybody with a 3B flywheel: Can you count the number of ring gear teeth between the 3B crank position timing pin (literally a round bar/pin pressed into a hole in the flywheel) and the TDC mark stamped into the edge of the flywheel beside the ring gear. I am starting to suspect the "62 degrees" notation is BS.

[Thuppu]

The easiest way to turn the engine when the radiator is in place is from the pas pump. In fact there is a place for wrench there.

[goodall]

I have an AAN flywheel on my 2.5tdi, it is nearly impossible to see in a type 89 chassis. I normally resort taking an injector out and using a dial gauge