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IMS BRG - 1-3 rear timing chain tensioner.

 
Old 07-09-2019, 11:34 PM
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LOevco1001
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Default IMS BRG - 1-3 rear timing chain tensioner.

1999 2.5L Boxster 5 spd Manual, Engine out of the car.

Replacing the IMS bearing. Removed the 1-3 rear timing chain tensioner. It fired out from the case.
Removed the Oil pump. The slack side of the chain, tensioner side is so tight it is pulling the IMS shaft
against the case on the 1-3 side. I ordered a bore scope to try to see what is happening with that chain.
Does any one know if the chain tensioner plastic guides fail and wedge against the chain? If so is the
guide replaceable with out pulling the head?




Last edited by LOevco1001; 07-09-2019 at 11:41 PM. Reason: update the model info
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Old 07-10-2019, 12:21 AM
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AnthonyGS
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Did you remove the IMS chain tensioner? If you have tension and compression on the chains they will pull one way or another. Did you lock the crank at TDC?

Itĺs all difficult to know from your post.
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Old 07-10-2019, 01:21 PM
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808Bill
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^Again, did you pin the crank and lock the cams first?
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Old 07-10-2019, 03:42 PM
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Originally Posted by 808Bill View Post
^Again, did you pin the crank and lock the cams first?
I followed the procedure in the 101 Performance Projects for Your Porsche Boxster book. Project 14 IMS
bearing removal. I used the 3 setscrew method to lock the IMS sprocket. I marked the cam locations
as per this article.The cam locations have not changed.
Unfortunately, the 2015 updated procedure is not in the book. It includes the pinning and locking of the camshafts.
I do not have the timing tool. So I will have to make one.
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Old 07-11-2019, 01:02 PM
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Originally Posted by LOevco1001 View Post
I followed the procedure in the 101 Performance Projects for Your Porsche Boxster book. Project 14 IMS
bearing removal. I used the 3 setscrew method to lock the IMS sprocket. I marked the cam locations
as per this article.The cam locations have not changed.
Unfortunately, the 2015 updated procedure is not in the book. It includes the pinning and locking of the camshafts.
I do not have the timing tool. So I will have to make one.

Let me get this totally straight. You didn't lock the crank shaft at top dead center nor lock the cams? No? Oh boy, this is going to get interesting. Please post how this turns out in the end. I need popcorn!
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Old 07-11-2019, 01:30 PM
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The thread is going on in the 996 forum. You may soon find popcorn there.
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Old 07-18-2019, 10:57 PM
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Originally Posted by NuttyProfessor View Post
Let me get this totally straight. You didn't lock the crank shaft at top dead center nor lock the cams? No? Oh boy, this is going to get interesting. Please post how this turns out in the end. I need popcorn!
Professor:
I reinstalled the 4-6 and the crank chain tensioners. I made a plastic IMS bearing with slip fits on the OD and ID. I used the existing flange to install this bearing
and pull the IMS shaft off the case while rotating the oil pump (cam shaft) in the wrong direction approximately 10 degree. I reinstalled the 1-3 chain tensioner. I rotated the crank one revolution CW to the TDC crank position. I pinned the crank. Checked the timing. Both sides are in time. I have made two cam locking fixtures. Will lock the cams and start the IMS bearing replacement again. I bought the LN eng, ceramic kit. I asked LN eng. if I should use this kit or the roller bearing kit after the fact. No response.
What kit do you favor?

Last edited by LOevco1001; 07-19-2019 at 11:22 AM. Reason: replaced crank with oil pump (cam shaft)
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