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Old 12-26-2018, 04:12 PM   #1
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1999 2.5 Crank Turns Cams Don't

Left Bank bent all of the exhaust valves, broke the cam chain, and peeled the teeth off of the exhaust cam.

Chains from Heads to IMS are still intact. (they don't move with the crank) Removed heads and IMS bearing retainer. Crank turns, back of IMS turns. So the crank to IMS chain is intact. Appears I-shaft is no longer connected to the crank drive sprocket?

Is there a keyway, spot weld, shear pin, flat spot??? What connects the shaft to the drive sprocket?

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Old 12-26-2018, 04:37 PM   #2
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I believe its just a press/friction fit.
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Old 12-26-2018, 04:54 PM   #3
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Originally Posted by Quadcammer View Post
I believe its just a press/friction fit.
Just press fit.

Iíve seen them pulled and then pinned

Drivers: '08 Cayenne Turbo, 96 993 «ab/Tip (wife's) & '92 964 Cab
Race Cars: '75 911 RSR Clone & '99 Spec Boxster
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Old 01-12-2019, 09:29 AM   #4
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Man, what a disaster, I`m sorry for your loss. Interesting fail that I`ve not heard about before. I wonder what happened first: the camshaft seized and forced the sprocket to turn around the IMS, or, sprocket disengaged from IMS and caused the disaster in the head? How about the right bank? That should be a mess too if the cams don`t move with the crank. Any update on this?

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