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Updated chain tensioner - IMS to Crank

jaykay

By jaykay
in 986 Series (Boxster, Boxster S)

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jaykay Member

jaykay

Posted
Posted

Just went pick up the most up to date chain tensioner for the IMS to crank chain. It's the one with the external spring. I was told that this spring type is not compatible with my early 2000 986S engine (dual row IMS bearing) as I have a roller chain type IMS drive and not the newer tooth drive chain.

These changes ( tooth chain ) were instituted for engine numbers M96.21 67 1 02086 onward. Apparently they could tell from my VIN that mine was an earlier engine (not sure I trust vin based engine component listings where is the engine number again?). I believe this is covered in a bulletin 8/00 1551.

So I belive some of you have put the newer style tensioner in irrespective of engine series and earlier chain type . Is it okay? Any issues? Did it help to chain rattle on startup?

__________________

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Loren Member

Loren

Posted
  • Admin
Posted

From the TSB... "After existing supplies of the previous parts have been used up, the new parts can be used as replacements for all Boxster engine types M96.20, M 96.22, and M96.21."

Of course all of Contributing Members would know that as they can read the TSB here online. (hint - hint)

jaykay Member

jaykay

Posted
  • Author
Posted

Thanks Loren, thanks for the nudge..."

I do have the TSB: it also includes a contradictory statement just below the one you quoted:

"A mixed configuration is not permissible as the parts are mismatched with each other. The previous chain tensioner part number 996-105-180-54 is still available and maybe continue to continue to be used on engines that have the previous style chain drive installed."

So I see the words may and not permissible all in the same statement.

It seems that the statement above means that earlier engines would have to put in new cam drive components to be able to take advantage of the new tensioner type

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Loren Member

Loren

Posted
  • Admin
Posted

 

 

It seems that the statement above means that earlier engines would have to put in new cam drive components to be able to take advantage of the new tensioner type

 

Yes.

  • 1 month later...

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