Damage at full counterclockwise rotation?

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08-20-2010, 09:56 AM

#11

turbo510

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Quote:

Originally Posted by lyleswk

The number of turns thing was intended to be an average over the life of a car. Sometimes you are going 0 MPH and turned 800 RPM, sometimes 40 at 2000 RPM, sometimes 70 at 3000 rpm (1.8t 5 speed gearing), etc etc. The point was that the engine has turned a bunch.

Visual damage? I have seen "worn" cams where the shape was symmetric and no longer was when removed. This was a cam from an engine that wasn't getting proper oil pressure.

I'll concede, just an interesting exchange

Point taken, in 100K miles the engine turns lots of times, and that you were talking about an average over lots of driving. What you say about cams wearing out happens too, and I've heard of cam problems on some Audis. Arguably the cams/lifter faces have the worst moving part situation of the engine, especially when starting. But I still say you can turn it backwards!

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08-20-2010, 11:11 AM

#12

lyleswk

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Sitting here reading this last one, I think I turned mine backwards when I did the timing belt back in January. What I did was put 4 whiteout marks (2 on cam and 2 on crank) to give me more points of reference to make sure I did it correctly; I even counted teeth (yeah I know, a bit ****). I think I spun it 2 or 3 rotations and when my marks were in random locations, I realized that I didn't know how many rotations it would take to align all my marks back up, so I turned it "backwards" to align my marks up. It have run about 2000 miles since then.

Anyway, thanks for obliging my engineer side

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08-20-2010, 01:50 PM

#13

600whpA4

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I turn mine backwards all the time when I am dealing with my clutch/flywheel setups which is very often since I did the test fitting of the new CM clutch kits for the A4 1.8t.

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08-22-2010, 07:32 AM

#14

melzdelight

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It is running fine. Just have codes P0300 and P0431. I guess it has a random multiple misfire code. Could this be causing the warm up cat below threshold code?