Like the title says if I jumped the timing on my 1.5 would the valves be damaged?

 

I did it and I was fine. Some people haven't had the same luck. It all depends on where your valves were when the head stopped moving.

If you only slipped the timing a little bit (like two or three teeth), you should be fine.

 

easy way to tell is reset your belt and run a compression test.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Andy R &raquo;</TD></TR><TR><TD CLASS="quote">easy way to tell is reset your belt and run a compression test.</TD></TR></TABLE>

very salient advice.

 

so it really doesn't matter hoe fast I was going when it jump timing

 

The stock motor has a good amount of clearance and if you only skipped a few teeth, chances are you are fine. Speed doesn't have anything to do with it, its all about timing of the valves with respect to the pistons. Being off a tooth or two the car will run like crap, but you won't have valve to piston contact yet.

Get the timing set back up and try running the car. You can't hurt it any worse.

 

When the belt breaks, the bottom end of the motor keeps spinning, and the pistons are moving up and down as usual.

The head is no longer connected to the crank pulley, so it just stops moving altogether.

If the valves were in a fully open position when the head stopped moving, then they'll stay that way, and the piston will most likely smash it.

However, if You only slipped the belt a little and not broke it, then odds are you're ok. Like it was said before, reset your timing properly, tension the belt correctly, and do a comp. test. A leakdown test would be even better.

 

If it's a USDM 1.5 and not a vtec motor then you are fine. The US motor is non-interference, meaning that even when the timing belt breaks the valves should not contact the pistons.. B18a and B18b motors are the same way, gotta love 'em for it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IT GUY &raquo;</TD></TR><TR><TD CLASS="quote">If it's a USDM 1.5 and not a vtec motor then you are fine. The US motor is non-interference, meaning that even when the timing belt breaks the valves should not contact the pistons.. B18a and B18b motors are the same way, gotta love 'em for it</TD></TR></TABLE>

I was told the b18a/b was and interference motor. I just had the timing belt jump and it wouldn't start after that. I took it to a trustworthy mechanic and they said it bent the valves???

 

this happened to me, I snapped my belt but luckily my pistons were down and 1&4 valves were closed when pistons 1&4 were up.

heres what it looked like (1&2)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IT GUY &raquo;</TD></TR><TR><TD CLASS="quote">If it's a USDM 1.5 and not a vtec motor then you are fine. The US motor is non-interference, meaning that even when the timing belt breaks the valves should not contact the pistons.. B18a and B18b motors are the same way, gotta love 'em for it</TD></TR></TABLE>

i believe somebody told you wrong

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civhatch90 &raquo;</TD></TR><TR><TD CLASS="quote">i believe somebody told you wrong</TD></TR></TABLE>

Is that directed at me or IT GUY?

 

1.5 are definitely interference.. i have a d15 in my backyard right now with bent valves from a broken timing belt.

b18's are also interference engines. people can sometimes get lucky, but when the belt breaks, a couple valves generally get bent..

jumping teeth, like someone above said, probably wont do much harm, aside from running like crap. do a compression test and see where you are at.

 

Guess I'm a lucky guy then... sorry to misinform

 

Yup, last I knew almost all(if not all, wouldn't know which ones aren't) of Honda's motors are interference.

 

**** I was doin 70mph with my stock d15 with 210k going to work last week and my tb just out of the blue decided to come loose , car died - I got towed home (good old AAA) chk'd things out got it on TDC with the crank re-adjusted the tensioner and low and behold everything was fine - guess that was a sign to get my new motor in the car asap

 

had it happen to me 3 times before the valves bent. blame it on a bad tensioner pulley.


I heard the dohc zc motors were non-interferance.