Vanos timing question

[tlow98]

A few thing in the Beisan instruction that I don't like:
1) torque the hub bolts to 11 ft-lbs by feel? I also don't like to turn the crank after timing with only 3 tighten hub bolts. Instead, after snug up the top 3 bolts on each hub, remove the vanos module and the pistons LH threaded shafts off the splined shafts, then torque all hub bolts using a normal torque wrench.
2. Installing the vanos with the 2 splined shafts attached is more difficult; instead I install the splined shafts to the hubs first, pretention the hub bolts, then install the vanos to the head and connect the LH threaded shafts.
3. After the hub bolt torqued down to spec and rotate the crank an even number of turns to TDC, no reason to use a 24mm wrench try to turn the cam CCW (front vu) before checking the cam timing.

very helpful. Thank you

[nextelbuddy]

A few thing in the Beisan instruction that I don't like:
1) torque the hub bolts to 11 ft-lbs by feel? I also don't like to turn the crank after timing with only 3 tighten hub bolts. Instead, after snug up the top 3 bolts on each hub, remove the vanos module and the pistons LH threaded shafts off the splined shafts, then torque all hub bolts using a normal torque wrench.
2. Installing the vanos with the 2 splined shafts attached is more difficult; instead I install the splined shafts to the hubs first, pretention the hub bolts, then install the vanos to the head and connect the LH threaded shafts.
3. After the hub bolt torqued down to spec and rotate the crank an even number of turns to TDC, no reason to use a 24mm wrench try to turn the cam CCW (front vu) before checking the cam timing.

Thanks everyone for the help. Got everything button up so did a valve adjustment as well

Will post back run vanos test results to compare against my results prior to the Vanos job.


Sapote, im not apposed to your suggestion but I'm wondering if you install the splines first info the hubs , tighten the hub bolts evenly then install Vanos unit.... How do you know how far to install the splines info the hubs first?

Isn't the whole point of installing the splines onto the Vanos first with the plungers pushed all the way into the Vanos so that it sets the depth of the splines onto the hubs a specific way which is what sets the timing?

Not arguing at all just wanting to know the how and why with your method to have a better understanding.

Thanks again for taking the time to explain things!

[sapote]

Sapote, im not apposed to your suggestion but I'm wondering if you install the splines first info the hubs , tighten the hub bolts evenly then install Vanos unit.... How do you know how far to install the splines info the hubs first?

Isn't the whole point of installing the splines onto the Vanos first with the plungers pushed all the way into the Vanos so that it sets the depth of the splines onto the hubs a specific way which is what sets the timing?

Install the splined shafts into the hub not all the way, but about 10mm, then pretension the hub bolts, not tighten them down, so later during install the vanos module, which will push the splined shafts into the hub further and rotate the hub (relative to the sprockets) to the correct positions for the right timing.

During bolting down the vanos to the head, evenly on the left and right bolts, this will push the pistons to their most retarded position and the splined shafts into the hub. If the vanos bolts are not tighten down evenly left and right, it might cock eye the vanos (not parallel to the head) and cause the pistons to jam and not move to the most retarded position.