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Re: Light knocking 2300-2700 RPM '97 CS 5 speed 1 Saabers Like This Post!
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Posted by Nixter [Email] (#680) [Profile/Gallery] (more from Nixter) on Thu, 21 Dec 2023 09:57:58 Share Post by Email
In Reply to: Light knocking 2300-2700 RPM '97 CS 5 speed, Nixter [Profile/Gallery] , Fri, 1 Dec 2023 14:03:54
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Update on the knock. Pulled the oil pan after a few hours (and a few choice words) and rotated the assembly with #1 at TDC. Pulled the caps from #1 and #4 and... the picture tells the story. The #4 bearing shells are on the left vs. the #1 on the right. Thankfully the journals so far look perfect - still polished and no heat marks or other scoring. Picked up a new set of Sealed Power bearings and will start rolling those in after checking the clearance with plastigage.

My theory is the #4 hit the right frequency vs. oil pressure leading to the knock sound, and the sound did seem to emanate from the back of the block vs. front where #1 would be.

I'll pull #2 & #3 this weekend and check but this looks like the root cause.

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