[MLB]

Thanks G96, that description is helpful. Lucky for me I was also able to meet up with the only other 968 owner in the area and take a couple photos. So im good to go.

Partial Post: Please Login or Register to read the full post.

[MLB]

Would someone kindly confirm if I have the balance shafts aligned properly? Ive read the threads, and all looks right, but this is the first time Ive messed with it 

1. I did not remove the BSB sprockets and my engine was balanced before belt replacement, so I'm confident the keyways are correct.

2. Flywheel lock is in place with crank at TDS, and cam sprocket mark is aligned with the mark in the cover

 

3. Large red arrows in pic are pointed at the respective alignment marks in the back plastic cover

4. Thin red marks emphasize the sprocket windows and their positions: the "zero" shows in the circle window on top, and in the rectangle window on bottom sprocket

5. Yellow and purple arrows point at what I presume to be (what's left of) the factory paint marks that are referred to in the WSM. This is the biggest wildcard in my view. It seems crazy that they would use paint, which can easily come off, to define what you're trying to align. And the line drawings (in the WSM) of the belt and sprockets are not tilted at the correct "real world" angle so that can be misunderstood too.

 

Anyway, does it appear I've got the BSB on correctly, and not misaligned by a belt tooth?

Thanks!

--Michael

   

Partial Post: Please Login or Register to read the full post.

[PorscheG96]

Looks correct. I can see the upper BS sprocket is aligned in your pic but cannot see the lower from that angle.  The BS sprockets have alignment notches on the inner guards for reference instead of the paint.

Partial Post: Please Login or Register to read the full post.

[MLB]

Thanks G96, now I see what you mean. Here are a couple more pictures that show the notches in the back of the metal sprockets, aligned with the orientation / reference marks on the back plastic case.

 

So this is pretty straightforward, as long as someone didnt get the keyways pointing the wrong way, which cannot be seen once the sprocket cover is in place (as stated in other threads). Its surprising how inattentive a mechanic must be in the many cases where forum members have reported that the shop got it wrong...

 

Hey, check it out, this is post #356, my first one that matches a Porsche model number.  :0)

 

         

Partial Post: Please Login or Register to read the full post.

[flash]

since both keyways should be pointing up, unless there are two of them, or two keyways, or the pulleys are reversible, both "O"s should be pointing in the same direction as well

 

i would pull those covers and check

Partial Post: Please Login or Register to read the full post.

[MLB]

WSM illustration is exactly what i have shown above

The keyways must both be up, but the "0"s point opposite

I could check but probably wont unless im missing something important here. My car has no weird vibrations at any rev range...

   

Partial Post: Please Login or Register to read the full post.

[Waylander]

looks right to me I have done a few now

Partial Post: Please Login or Register to read the full post.

[Bulti]

The tabs on the sprocket covers also prevent you from getting it wrong, as long as the "0" is showing in the correct round and rectangular opening. This is, of course, if the tabs are still there.

Partial Post: Please Login or Register to read the full post.

[MLB]

I dont have the special spanner tool for loosening sprocket bolts. If only for the sake of my tool collection, is it a unique or standard size? Is there such thing as an adjustable type of wrench for this?

Thanks

Partial Post: Please Login or Register to read the full post.

[flash]

whether or not vibrations exist is not a good diagnostic tool to prove a negative.

 

so, one of the conditions i described exists (2 keyways).  therefore, it is prudent to pull those covers and look at the keyway.  if the belt is in place, i see no reason you cannot merely squeeze the belt around the pulley with a pair of pliers so the belt does not slip and then put a wrench on the bolt in the center of each, and give it a go.  not as good as a spanner wrench, but should work.

Partial Post: Please Login or Register to read the full post.

[williamoss]

for us less mechanically challenged or involved could you label the circles show in the diagram above so I for one would know what they are.

Partial Post: Please Login or Register to read the full post.