Need Help!

[khumezu]

Hey Audizine need your help with a problem! I just recently did a water pump and timing belt change. Pulled the front off my B6, empty the oil and coolant. Changed the the water pump and timing belt, put everything back together. Tried to start the car with no success. The starter was turning very quickly and i crapped myself right there. I proceeded to do a compression test with all cylinders showing zero pressure. Pulled the VC to check the timing and at TDC. there is 16 rollers between markers. I then took the lower part of the compression hosing and blew vape into the #1 cylinder and to my disbelief vape blew out of all the 2,3,4 holes. So now i'm thinking that the head gasket is done?? Here is what gets me... I had a coolant leak from the pump so decided to change the timing belt and pump. The car was running perfect so i don't understand how the head gasket could have blown. Please let me know what you guys think on how there is zero pressure in all 4 cylinders. Thanks to all

[Let it snow]

Right after a timing belt change and now no compression. It sounds like your timing was off and bent some valves. Or you sure your timing is good?

[khumezu]

Timing was good or what I perceived to be good. Here is the thing, air is leaking into all the cylinders as if there is a leak in the head gasket between all the cylinders.

[old guy]

Not the head gasket. Probably bent valves.

[khumezu]

can you bend the valves by manually turning the engine?

[old guy]

can you bend the valves by manually turning the engine?

Not really. I assume you are asking because you turned the engine over a few times by hand after replacing the timing belt?

[khumezu]

Question for you old guy, If i bent the valves would air travel from cylinder to cylinder? That is the case right now, i assumed if i bent the valves to one cylinder pressure would be different from cylinder to cylinder. Actually air travels from cylinder to cylinder without abatement.

[old guy]

If the valves are not sealed the air can travel equally through all the cylinders via the intake manifold. If you cranked the engine over with the timing off you probably bent valves in more than one cylinder.

[old guy]

What's bothersome is that you immediately noticed a difference the first time you cranked the engine over. You mentioned that it seemed to spin freely. Then you followed up with a compression test and couldn't get compression on any cylinder. So you definately have a timing problem.

Back to my previous question: Did you turn the engine over a few times by hand before using the starter? If you did and it turned freely then there is a remote chance that you simply have the timing off enough to have either the intake or exhaust valves not quite closed during the compression stroke. If this is the case then stop turning the engine and double check the timing again. You might get lucky!

[khumezu]

Would you have a diagram of camshaft position for TDC on a compression stroke or exhaust stroke? I have an idea of what my 1.8t should be timed at but i'm second guessing myself now.

[old guy]

Your crank pulley should align as shown below. If you look closely at the tooth marked with the arrow there is a small dimple for the express purpose of alignment with the rib above the marked tooth.



Here's how your cam timing should look.

[old guy]

Here's another mark you can use for the crank after the belt pulley and lower cover has been installed.

[OttawaWill]

Your crank pulley should align as shown below. If you look closely at the tooth marked with the arrow there is a small dimple for the express purpose of alignment with the rib above the marked tooth.



Here's how your cam timing should look.

That there is a purty gates racing belt.... almost a shame to hide it...

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