Camshaft timing on m52 with s52 cams help

[brokeneck]

Hi,I recently just put s52 cams in my m52 from a 1996 328i and I am trying to do the timing and things don't seem to be lining up as they should. Hopefully one of you can help.

IMG_8619.jpg
Crankshaft at TDC

IMG_8620.jpg
Cams flush with head in timing blocks


IMG_8624.jpg
Holes are pointed up and intake (E) cam and exhaust (A) cam are in the right places


IMG_8625.jpg
Exhaust sprocket no tension


IMG_8627.jpg
with tension

Basically from all the guides I have seen on timing and the pelican parts guides, it says the holes should the holes biased all the way to the left. Also when I put the vanos gears on, the threaded holes go behind the gear so the vanos would not be able to travel the full amount of rotation that it is slotted for.

The only thing I could see fixing this is if I were to rotate the exhaust camshaft to move the holes to their correct location with respect to the exhaust sprocket, but then the cam block is not flush at all on the exhaust cam. Any help is much appreciated, thank you.

[bluptgm3]

http://www.beisansystems.com/procedu..._procedure.htm


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[brokeneck]

That link doesn't seem like it goes over the exhaust sprocket camshaft gear alignment though, only the removal and installation of the vanos unit, unless I'm missing it.




IMG_8628.jpg
Vanos gear at one end of rotation

IMG_8629.jpg

Vanos gear at other end of rotation

[XnWarden]

Its been a while since I did mine. Looks like you have the cams and crank at tdc already. Are you just struggling with the vanos sprockets? You need to rotate that sprocket a few degrees so the bolt holes match up with the min and max when rotated. Yours are off in the pic and the holes are partially covered by the sprocket

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[XnWarden]

I had raji help me do mine but I remember the sprocket detaching from the cam. So you get the cam locked and then install the sprocket on it

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[brokeneck]

Okay so should I just rotate the vanos sprocket in the vanos chain to match up? At this point I have kept it exactly as it was when I took it off.

[XnWarden]

Okay so should I just rotate the vanos sprocket in the vanos chain to match up? At this point I have kept it exactly as it was when I took it off.

Yeah i remember i stored mine on a shelf with the two sprockets and chain in the exact same position. But on the reinstall we had to adjust them a bit. 10k miles no engine issues so far

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[XnWarden]

Just make sure the cams are timed with the crank and turn the engine by hand a few Times to make sure its smooth

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[brokeneck]

Yeah so I adjust the vanos sprocket on the chain and now it’s lined up, so to check to make sure my timing is right with the crank I just rotate it all tensioned up and bolted down and feel for resistance?

I also have to pull my other engine from my car anyways to put this one in and get one of the intake sprocket studs cuz the threads stripped on one , so I can compare them when I get that out too.

[spyderg0d]

The primary gear has to be bias to the left. But the secondary does not matter in relevant to the holes as You have to make sure that the secondary timing system has full travel of both sprockets while the secondary timing chain is on without moving either camshaft.

Then make sure the vanos is gear goes into the camshaft as soon as you pull the secondary timing chain hand lever tool.

Now that I think of it. I've never asked why the primary timing gear is slotted rather than just alignment holes..

[bluptgm3]

Now that I think of it. I've never asked why the primary timing gear is slotted rather than just alignment holes..

Does this allow for variation in deck height and head height (milling)?


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[spyderg0d]

Does this allow for variation in deck height and head height (milling)?


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I don't think so. The primary timing chain tensioner would make up for the slack the same as a slightly stretched chain.

[XnWarden]

I don't think so. The primary timing chain tensioner would make up for the slack the same as a slightly stretched chain.

Unless the chain tensioners are also worn out.

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[bluptgm3]

In the case of the chains - The chains can stretch so effectively the distance is shorter than nominal. The tensioner does take up the slack in the slack side. The actual distance change occurs on the drive side.


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