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· PassatWorld Elder
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28,024 Posts
I am new here. I am a seasoned DIYer and I am fairly skilled in fixing my cars. This does not mean I make no mistakes though.

My V6 30V passat has reached 170k miles so I did the timing belt job the 2nd time to it. I did the first at 100k miles and all was OK. The engine started and idled smoothly. It rev'ed up fine too. So I think the job is successful. I also had the cam chain tensioner gaskets replaced and new valve cover gaskets put on. All seem to be OK.

However, I noticed something. I hand cranked the crankshaft to the position so that the 3rd cylinder is at TDC. I found that while the bank 2's cam is perfectly aligned but the bank 1's cam is slightly off. I only own a cam alignment locking tool for a different VW engine. It is about 6 inches too short for the Passat B5 V6 engine. But I can attach it to one cam gear at a time and check if the other end is perfectly lined up horizontally. In this case the bank 2 is perfectly horizontal but the bank 1 is slightly off.

When I did the belt job I mainly relied on marking the belt and counted the number of tooth between marks to make sure the new belt goes back to the same setup. But the bank 1's cam is slightly off. And it looks like if the belt is stretched over time it would become perfectly lined up. I don't think the belt will stretch and becomes longer though.

I tried to readjust the belt by one tooth. That's a lot of work but I did it anyway. The bank 1 was still off a little but to a different (worse) direction. As soon as the engine was started it threw a code of p0341. I took it apart and adjusted it back 1 tooth. The engine then ran fine and rev'ed up fine again. The problem is the bank 1 cam looks still slightly off. I think the ECU did not find the cam angle to be out of range yet. My question is should I just drive the car and forget about it? I have let the engine idle, rev'ed up and down for quite some time. There was no code thrown.

I can try to get a correct cam locking tool and have the cams perfectly aligned. But i hate to have to wait for the tool and take even longer to get the job done. OKI should get the tool and have it done right. I am still curious why the bank 1 cam is off slightly? The cam gears were never loosened so they are at the original factory setup still. There is no code thrown by the ECU. Very strange.

All suggestions welcome. Thanks.
You should be fine with the way the car is now, without a proper cam tool, it would be tough to judge how far the cam would need to be moved to be perfect. With the cam tool, you would only have to loosen one side, install the tool and lock down the pulley again. That can be done without service position. I would not worry about how this came to be, the belt can stretch but not very far.
 

· PassatWorld Elder
Joined
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28,024 Posts
Excuse me? Please explain the recipe for disaster? I do these 2.8,2.7,1.8,2.0 with my eyes closed,


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You should not rotate the engine with the cams only half torqued. They are likely to slip and you end up with bent valves. While you may be experienced enough to know that they have not, for a single owner DIY, taking a chance like that can be catastrophic.

I am telling the OP that the engine would not self-destruct if the cam is off a fraction as it is not setting a cam code. If it were off a full tooth, it would set a code.

And yes, your initial post was not easy to understand for me. I do not intend to slight you, as my posts here are geared to the less experienced forum users.
 
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