How to measure timing chain stretch on B8.5 Audi S4 3.0T - User Guide?

[stefdds]

What should the values be?

post #14.

 

[raceshop147]

Ok thanks for your confirmation. I’m assuming if my camshaft inlet phase values are -750° to 0.750° at 119k it’s perfectly fine because the threshold is 11.0 to -11.0 (failure).

Any other inputs to read on VCDS to determine if timing parts (chains / guides) should be replaced that you know of ?

Thanks for your input I appreciate it

 

[raceshop147]

I researched a bit and will be adding PN VAG-059193175F the oil pressure check valves to the car while servicing the supercharger.

 

[Eric]

Wow, I had no idea this was a thing. If/when I decarb mine, I will definitely be (re-)adding those. I had no idea they went cost-cutting on the B8.5 at the expense of startup oil pressure

 

[SeattleMatt]

I researched a bit and will be adding PN VAG-059193175F the oil pressure check valves to the car while servicing the supercharger.

Can you please elaborate or point to this subject matter somewhere?

Thanks

 

[Dr Sheldon]

I really wish people would stop pretending their phones are an adequate substitute for a real computer.

Me too - They are a nuisance !

Any other inputs to read on VCDS to determine if timing parts (chains / guides) should be replaced that you know of ?

VCDS will only give you what your car gives to VCDS (Any Scan Tool) Processed Serial Data. Often too little and too slow. Not the best sample rate so potentially bits missing from it. It is a risky way to proceed.

I avoid Processed anything Food or Data ! It just makes sense.

Ideal is Raw Data / Measurements collected from the car. Accuracy in measurement is the foundation for faultless informed decision making !!

 

[raceshop147]

Can you please elaborate or point to this subject matter somewhere?

Thanks

Chain Rattle Fix

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