IMS timing question

[BYprodriver]

Originally Posted by Homeoboxter

Hey All,

I asked this question a while ago somewhere here but I had no answer so I thought I ask again before I assemble the engine. My understanding is that the crankshaft has to be lined up with the 4 camshafts, and the IMS position with respect to the crankshaft shouldn`t really matter. However, there`s a punchmark on the IMS sprocket, am I right that I can just ignore that?

If you know the answer or you have assembled a Boxster engine and paid/didn`t pay attention to this alignment I`d appreciate if you could chime in.

Thanks
Greg

The IMSB external flange is just a mount for the bearing to spin on. If it's a LN bearing just torque the bolts to spec & you are done. I would guess the punch mark is from the machining process.

[maytag]

Originally Posted by BYprodriver

The IMSB external flange is just a mount for the bearing to spin on. If it's a LN bearing just torque the bolts to spec & you are done. I would guess the punch mark is from the machining process.

I know you'll think this rude of me, so I'll be extra sensitive.
I don't think anything in this thread is about the external flange, and so your post is likely to confuse some future reader. (As it confuses me)

Sent from my SM-G970U using Tapatalk

[Fiddlebog]

My guess is that the punch has significance if it is lined up to other components. I.E.: you could tell the orientation of other components without seeing them.
Just a guess.
BYprodriver could be right about it being an artifact of manufacturing, though (although seemingly being confused about the component in question).
Having worked in a machine shop, I've put marks in seemingly odd places, either for our use, or to help with assembly in some way.
The way these engines were manufactured in the original facility could have had an important use for that mark. German sophistication often goes much deeper than what is apparent at surface level.

Ultimately, though, I do not think the orientation of the IMS is functionally significant, as it appears to be radially symmetric other than the mark.

[Gilles]

Originally Posted by piper6909

If the chains have marked links, it's probably to help you during chain installation.
Yes, the timing chain has one link with a different color that you are supposed to align with the dot on the sprocket

I am really sorry, I did not put attention and assumed that the picture was from one of the Cam Sprockets...

[Homeoboxter]

Originally Posted by Gilles

I am really sorry, I did not put attention and assumed that the picture was from one of the Cam Sprockets...

No worries!