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Hello I own a Saturn Sc2 Which I did a top end Rebuild has head redone completely and Piston Rings Reringed and also Timing Chain and Tensioner ...Also all New Gaskets and ALL . After Motor being Installed Back in Car About 2 Weeks of Driving it a Really Loud Knocking Noise Came about Which Was Contious and Got louder as accerated... Can anyone that can help with where the Noise might be Coming From It Sounds Like it Bottom end of Motor .Motor is Back out and on Stand Completely Torn down again . I am Leaning toward Piston Bearing and Crankshaft Bearings ...Thank you !!!


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contributions: 2219
Images: 37
Location: Oregon
without actually hearing the noise, from the description you gave it does make sense to look at the rod bearings and main bearings. you should have checked oil pressure before you pull the motor. otherwise while you do the bottom end you might want to include a new oil pump and pickup tube.


   
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IT Has Compression and Oil Pressure ..Tested it before I pulled Motor out of Car ..it made kinds knocking noise ..By using Stetascope Listen to knocking and seemed Like it was coming from Block location


   
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contributions: 2219
Images: 37
Location: Oregon
rod knock or a main bearing knock won't lower the compression. Bearing knock is where the bearing has worn enough or spun and allow a space between connecting rod and crank or the crank and the main bearing mount. the explosion in the cylinder makes the rod close the gap with a knock sound. if the engine was still in the car you could run the engine and remove the spark from one cylinder at a time and see which cylinder the knock is coming from.


   
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