I'm really sorry for picking this problem up again, but I'm really totally lost and don't know what to do. That's why I'm calling for your help guys.

After I have rebuild my 4G H22 (new rings+bearings) and changed my timing belt, the engine makes this sound at 1000 RPM: http://www.volny.cz/veitel/prelude/vtec.mp3.

1) The sound comes only at approx. 1000RPM, nowhere else. Dosn't matter if the engine is cold or warm, doen't matter if I go or stop. It seems that the sound comes from the inside of the engine itself (head or block, form the side of the timing belt).

2) I tried to remove the PS pump, alternator and A/C. No change. I also removed both the crankshaft pulleys, no change.

3) I removed the timing belt gear on the crankshaft, cleaned it, greased the hole in it (no the belt itself) and returned back. I thought there could be some clearence. No change.

4) The autotensioner and adjusting pulley were replaced for the manual H23 one. No change.

5) I removed the balancer belt, no change.

6) I changed the water pump, no change.

The sound disapperas at some conditions: When I set the timing belt tension according to the Helm's, the belt is pretty tight (same as with the autotensioner) and the sound is there (again same as with the autotensioner). When I make it little loose, the sound dissapears, but the belt itself vibrates a bit (about +-0.5cm on its way between the exhaust camshaft and crankshaft). With the autotensioner (when the tension is set right), the sound is still there.

WTF can this be? Why the sound stops squeaking when I loose the timing belt? The timing belt and all around there is brand new and correctly instaled, valves are set to spec. What else is directly connected to the timing belt?

The engine has 50000 miles and runs strong. I don't want to destroy it :-(.

 

ok heres my guess

to me it just sounds like the rubber of the tbelt gripping on the metal surfaces on the teeth of the gears. just like the sound rubber shoes make when you walk on metal or highly polished floors. and it seems like you can still hear it when the engine speed increases but the engine itself is just loud enough to cover the sound. Also if it goes away with less tension on the belt, that could be because there is less friction between the belt and the gears. i think after a few thousand miles when the belt itself wears in that the noise should go away.

 

Perhaps. But its been about 5000km (3000miles) from the timing belt change and the soud it still there.

 

i just did mine last week when i rebuilt my motor i think my engine sounds like yours does except not as loud. maybe someone else who really knows will give your more help them my guess

 

I hope it can't be oil pump when the sound stops when loosening the timing belt a bit?

 

did you just rebuild it? Did you make sure to oil the cams before putting them back in? I just replaced my legend's hg and when I first start it up it sounded excactly like that. I ran it for 30 minutes serveral different times and after awhile teh sound went away. I had no idea what it was but i figure something just needed time for oil to get in there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by petrv &raquo;</TD></TR><TR><TD CLASS="quote">I hope it can't be oil pump when the sound stops when loosening the timing belt a bit?</TD></TR></TABLE>

the oil pump is controlled by the crank itself, so a loose belt wouldn't affect that.