so today i broke my timing belt . i was sitting at a light at very low RPM's. before i realized the belt, i tried crankin it over for a bit. what are the chances of bending valves while idoling(sp?). unsure of my situation and low income(school), i decide to reg. and post this. any help is appretiated

b16 head,b18c block w/ stock internals

 

the first thing i would do is look everything over.then i would put another timing belt on and fire it up.if it sounds just like it did before i would assume everything is ok.but i would at least do a compression test to see what each cylinder is doing.hope this helps and good luck with getting your car back on the road.

93 cx hatch street car w/ deck plated h22 "2.6L"
XS T67 BB w/nos pro race fogger

shooting for over 700

 

as sayd above, put everything back together and start her up to see how it idles.
leakdown and compressions tests will tell you

 

i would compression test it before i start it up

 

I'd check valve clearances. Here's how to do it with a broken belt...

1) Before you do ANYTHING, take OFF the belt & put the crank timing mark 90 degrees away from tdc. It doesn't matter whether its before or after, but DO NOT pass thru TDC or BDC on your way, in case any of the valves are open. That way all 4 pistons will be in mid-stroke. Now you can spin the camshafts all you want.

2) Measure all the valve clearances. You can simply spin the camshaft pulleys around to line up each set. Don't spin the crank. A bent valve will have a larger clearance, because being bent it can't close all the way.

3) If you're good so far, now turn the camshafts to their timing marks. Then turn the crank directly to it's mark, even if you have to turn it backwards. Don't turn it thru BDC. Install the timing belt.

4) Compression test, leakdown test, or whatever...

 

thanks all
i know to check compression and what not. i was going to change the belt today but its raining hard as hell and my garage leaks .

but what i am wondering is, what are the odds of bent valves?

 

its is pretty easy to bend a valve on dohc vtec motors, but then again you were just idling, so... it might just be your lucky day...

 

more than likely you bent a valve because that is a high interference head.

like blake said, first rotate the crank so all the pistons are in the middle of their stroke. then simply rotate the cams by hand. if a valve is bent, it will hang and show you itself by not following the rocker. if it is ever so slightly bent, it will click shut.

i bent 14 out of 16 valves on a d16z6 head at >2000rpm's. ive also bent a valve on a b16a during startup.

 

yeah, then again i broke a timing belt at idle and did not bend any valves...

 

im praying here

 

thats luck muller.

the d16 froze a cam on the middle journal, caused the timing belt to eat teeth. it was nasty.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jerzey hatch &raquo;</TD></TR><TR><TD CLASS="quote">im praying here </TD></TR></TABLE>Good for you!

Whether or not you bent any valves, it's already done. But you don't want to do any more damage, so you better get that crank moved AWAY from TDC so all the pistons are mid-stroke.

 

ehh the crank probally didnt land on TDC when the belt broke...then again my car is cursed

 

you could get lucky like me, my belt was 11 teeth off, and i was reving the hell outta it to see why it wasn't sounding/running right. but a compression test showed 228 across. i was scared