when i start my car a loud tapping noise goes on for about 3 seconds, then after around 3k rpm the same noise happens and gets louder and louder as the rpm goes up. Would this be a spun bearing?

 

could also be a bent rod. bottom of the rod is probably hitting the bottom of the cylinder walls

 

is it expensive to fix?

 

more than likely... could also be a bent valve but the b series are famous for spinning bearings

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlitzkriegLs &raquo;</TD></TR><TR><TD CLASS="quote">when i start my car a loud tapping noise goes on for about 3 seconds, then after around 3k rpm the same noise happens and gets louder and louder as the rpm goes up. Would this be a spun bearing?</TD></TR></TABLE>

 

loud tapping or clicking?? could be time for a valve adjustment

 

its actually more of a loud tapping than a clicking.

 

You say the sound gets louder on higher rpm's. Does it also get faster?

A spun bearing would make noise like that, plus it would make noise all the time. How bout this....how fast is it actually? Is it so fast that you can't replicate the noise vocally? Or is it just fast enough where you can imitate it?

The reason I'm asking is to narrow down the choices. For example valve tap is VERY fast. You can't really make "clicking noises" with your mouth THAT fast. Where as rod knock/spun bearing/etc isn't AS fast and you can kinda make that sound.

Do I make any sense?

::imagines you making fast clicking/knocking noises with your mouth right after this post::

 

umm yeah pretty fast, cant imitate it. But if i keep the rpm below 3k it wont make the noise, only when i start the car.

 

sounds like when i spun my rod bearing....

 

better stop driving your car and change that rod bearing before u scratch up ur crank.

 

any ideas how much for repairs?

 

Sounds like a few marbles in your engine when you start it up and when you let off the gas?

You probably didn't spin the bearing, yet. The bearing is probably chewed and the clearance is really loose. Look to replace the rod and polish the rod journal.

Same thing happened to my engine.

 

Does is get louder with more throttle? If you can locate which side of the motor the sound is coming from, it might help.

 

i dont know if it gets louder but it does get quicker. Ill find out what side its coming from though.