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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Dec-11-2019, 11:20:07 PM   #1
sapote
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Default Can you damage the engine with bad Vanos timing work?

Can you damage the engine with bad Vanos timing work?

Bad timing setting will lead to error codes, but it’s safe to say that if both camshafts checking holes are pointing straight up relative to the head top surface and #1 cam lobes are pointing at each other at crank TDC, regardless vanos pistons location, then there is zero chance of bending valve with engine running. (Assuming hub bolts and cam sleeve bolts are tight.)

So don't sweat out. With this guarantee, all of us should be less nervous which leads to less errors and less tools drop into the black hole during this work.
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Old Wed, Dec-11-2019, 11:22:38 PM   #2
Braymond141
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Default Re: Can you damage the engine with bad Vanos timing work?

Okay.
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Old Wed, Dec-11-2019, 11:27:05 PM   #3
TboneM3
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Default Re: Can you damage the engine with bad Vanos timing work?

I swear we've seen people on this forum post about bent valves after a timing job (cam swap/vanos work e.g.)
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Old Wed, Dec-11-2019, 11:31:46 PM   #4
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Default Re: Can you damage the engine with bad Vanos timing work?

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Originally Posted by TboneM3 View Post
I swear we've seen people on this forum post about bent valves after a timing job (cam swap/vanos work e.g.)
Maybe cams were mixed up. Other than that I don't see how the vanos setting -- no matter how much the timing off -- could cause bent valves.
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Old Thu, Dec-12-2019, 01:46:11 AM   #5
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Default Re: Can you damage the engine with bad Vanos timing work?

there should be enough clearance between valves and pistons in the max advance intake and retard on exhaust vanos settings. if the cam is indexed wrong by enough then you could theoretically erode the clearance margin to a negative number. Never underestimate the incompetence of some members of the human race.
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Old Thu, Dec-12-2019, 01:50:34 AM   #6
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Default Re: Can you damage the engine with bad Vanos timing work?

In a world where folks invent their own ways to time the engine... anything is possible
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Old Thu, Dec-12-2019, 02:16:39 AM   #7
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Default Re: Can you damage the engine with bad Vanos timing work?

I’m confused. Why not just follow Raj’s extensive DIY or svtshadow’s write up on the timing?
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Old Thu, Dec-12-2019, 02:49:54 AM   #8
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Default Re: Can you damage the engine with bad Vanos timing work?

Quote:
Originally Posted by 02_LSB View Post
I’m confused. Why not just follow Raj’s extensive DIY or svtshadow’s write up on the timing?
You can, and should, but if what Sapote says is true, then it is good info to not sweat it if the cams get timed with the bridge in the correct orientation but you are fearing the pistons may be in the wrong position or something. Just good info to take some stress/anxiety out of this especially for first timers.
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Old Thu, Dec-12-2019, 03:26:29 AM   #9
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Default Re: Can you damage the engine with bad Vanos timing work?

If hypothetically one managed to get the vanos mounted with the pistons fully extended instead of fully retracted, then you could be out of phase by 60 and 45 degrees on the intake and exhaust respectively. The other obvious way you could **** up is if the crank isn't at TDC.
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Old Thu, Dec-12-2019, 04:28:02 AM   #10
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Default Re: Can you damage the engine with bad Vanos timing work?

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Originally Posted by terraphantm View Post
If hypothetically one managed to get the vanos mounted with the pistons fully extended instead of fully retracted, then you could be out of phase by 60 and 45 degrees on the intake and exhaust respectively.
If the pistons were not touching the front caps with cams holes straight up, then both cams will be retarded further, up to 45 deg EX and 60 deg IN, and the valves are far away from hitting pistons. Still safe.
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Discussing Can you damage the engine with bad Vanos timing work? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)