1991 240sx engine knock

[b240rollinhard]

Hello all,

I'll try to explain my problem as briefly as I can. While driving my 91 240sx DOHC I noticed the engine was knocking. When I got home I saw the crankshaft pulley bolt was loose. I tightened the bolt using my impact wrench and then started the car. Still has a loud knocking sound. The knocking is coming from the bottom of the motor. I can't really pinpoint it. I tried hand cranking the motor and it feels as though something came loose internally. Hopefully this make sense. Any advice would be appreciated. Thanks

[wa-chiss]

well, installing the pulley with an impact wrench was a mistake. Is there a lot of play if you were to turn the Cranckshaft back and forth? If so, you probably snapped a guide or something.

There is also a good chance a bearing has spun. That would be my 1st guess.