~2000rpm weird sound, crankshaft loose??

mhrallyteam · Post by **mhrallyteam** » Fri Mar 25, 2005 3:18 pm

Details: Engine runs ok, but at around 2000rpm a got a intermittent clunking sound, different from the valve lifter sound.

Sound kinda like a diesel, and i dont hear it quite as much at any other rpm. Its noisiest when the engine is off load

What do you guys think : is my crank bearing on the go or im i too paranoid

TDGKORN · Post by **TDGKORN** » Fri Mar 25, 2005 4:19 pm

I am having the exact same noise.

I haven't been able to track it down yet.

I hope it's nothing to serious.

professor · Post by **professor** » Fri Mar 25, 2005 4:57 pm

water pumps usually bang around when you let off the power, as the rotor sorta freewheels for a little while

TDGKORN · Post by **TDGKORN** » Fri Mar 25, 2005 4:58 pm

I hope it's just a water pump!

mhrallyteam · Post by **mhrallyteam** » Fri Mar 25, 2005 8:24 pm

I doubt the water pump would make such a deep clunking noise, but thanks for the cue

evolutionmovement · Post by **evolutionmovement** » Fri Mar 25, 2005 11:39 pm

Crank on the pulley to be safe. Could be detonation?

Steve

mhrallyteam · Post by **mhrallyteam** » Mon Mar 28, 2005 2:58 pm

I would be awfully surprised to see detonation at 200rpm without any load on the engine. I rebuilt the engine(except bottom end) last year, so i don't think there is any carbon built up in the cylinders. I'll keep looking.........

My guess, wrist pin loose or crank bearing

spongewagon · Post by **spongewagon** » Fri Apr 01, 2005 11:06 pm

Check the crankshaft pulley nut. I had a similar noise, it got worse and worse until it almost fell off.. I had to tighten it with a huge extension and the car in 5th gear .

If you have an auto you may have to take the starter out and jam the flywheel to tighten the bolt.

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~2000rpm weird sound, crankshaft loose??

~2000rpm weird sound, crankshaft loose??

Crankshaft pulley