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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, Sep-13-2017, 04:11:40 AM   #11
WOLFN8TR
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Default Re: Vanos splined shaft installation

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Old Wed, Sep-13-2017, 05:21:34 AM   #12
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Default Re: Vanos splined shaft installation

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Originally Posted by 02_LSB View Post
There is no trick to it. Insert into the first available spline. No such thing as sweet tooth. Follow raj's procedure and you'll be ok

I ran into the same issue while doing this job, but, in the end I followed raj's procedure without issues.


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http://www.m3forum.net/m3forum/showthread.php?t=532100

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This is the way to go. There is no "sweet tooth". When the hubs are torqued, it's the cams that are moving, not the hubs. If you follow Raj's procedure, the cam will be timed perfectly. It's easier to torque the hub bolts without the splined shaft installed, but if you torque the hubs before you insert the splined shaft, you will be guessing at the timing. If you look at the procedure in the TIS, it is similar to Raj's procedure because the hub bolts are torqued after the splined shaft is installed.
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Old Wed, Sep-13-2017, 12:46:56 PM   #13
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Default Re: Vanos splined shaft installation

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Originally Posted by 02_LSB View Post
I'm just curious - What is the purpose of making cam marks on a variable valve timing engine?

I was under the impression that
timing is set down a few mm, so the even with marks, you're not putting splines back into the initial position.


It's just so you know which tooth you used. There is a sweet tooth but if you're a few teeth either side it will be fine. If you rotate the spline 180 from the sweeth tooth you will have to rotate the hub considerably to get spline to slide in. That could limit how much the cams can advance/retard.
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Old Wed, Sep-13-2017, 01:03:49 PM   #14
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Default Re: Vanos splined shaft installation

The sweet tooth has become this car's g-spot.
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Old Wed, Sep-13-2017, 01:14:12 PM   #15
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Default Re: Vanos splined shaft installation

The sweet tooth is 100% useless to do...

... and I do it every time

But, seriously, it is without benefit.
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Old Wed, Sep-13-2017, 02:41:11 PM   #16
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Default Re: Vanos splined shaft installation

We follow the TIS procedure and use the BMW spacers and torquing sequence. Works every time. We have found no "sweet spot" that makes any difference at all, nor has my colleague, who designed and built dozens of these for Dinan over the years.

--Peter
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Old Wed, Sep-13-2017, 03:41:07 PM   #17
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Default Re: Vanos splined shaft installation

From a manufacturing standpoint, with all new parts, there is no sweet tooth. Anything remotely close to a sweet tooth is literally just wear in tolerance that makes one tooth clock in a few thou before another tooth. In the original factory assembly they just threw on the VANOS and grabbed the first tooth.
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Old Wed, Sep-13-2017, 03:47:10 PM   #18
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Default Re: Vanos splined shaft installation

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From a manufacturing standpoint, with all new parts, there is no sweet tooth. Anything remotely close to a sweet tooth is literally just wear in tolerance that makes one tooth clock in a few thou before another tooth. In the original factory assembly they just threw on the VANOS and grabbed the first tooth.
This!

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Old Wed, Sep-13-2017, 05:06:57 PM   #19
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Default Re: Vanos splined shaft installation

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Originally Posted by Ramp1 View Post
From a manufacturing standpoint, with all new parts, there is no sweet tooth. Anything remotely close to a sweet tooth is literally just wear in tolerance that makes one tooth clock in a few thou before another tooth. In the original factory assembly they just threw on the VANOS and grabbed the first tooth.
That's not correct-- the sweet tooth exists because there's a different number of splines in the curved portion than in the straight portion, so they don't align 1:1. The result is there's one spine that will slide in without rotating.
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Old Wed, Sep-13-2017, 05:10:45 PM   #20
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Default Re: Vanos splined shaft installation

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Originally Posted by Obioban View Post
That's not correct-- the sweet tooth exists because there's a different number of splines in the curved portion than in the straight portion, so they don't align 1:1. The result is there's one spine that will slide in without rotating.
Fair enough, but that difference is not mechanically relevant to the operation of the vanos. I think we agree on that! From a mechanical relevance point of view, each spline is identical.

--Peter
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Discussing Vanos splined shaft installation 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)