90 Civic Lx 4 door D15B2

Interference motor or not?

Girl just bought a car....a day later the timing belt snaps.....is this an interference motor, ie valves smacking the pistons.....?

I havent gotten a comp checker to make sure yet, so I figured Id ask the quick question

 

Did the valves slap...
Did honda make ANY motor that wasnt an interference motor?

LOL, I dont think I got so lucky

 

i've heard of timing belts breaking at idle and not bending valves.
if she was driving when it broke then more than likely valves got bent.

See if the belt jumped teeth. Maybe you can reset it. if it's fine that head will need some work.

 

No, the belt is completely snapped....i guess Ill take the head off tomorrow..but Im pretty sure what Ill find

I guess another motor is goin in.....itll save some time and money I guess

 

With the timing belt off, try this before you decide to scrap the engine...

Move the crank AWAY from TDC or BDC. Now all 4 pistons are mid-stroke & you can turn the cam without additional damage.

Turn the cam & measure valve clearances. Any bent valves should have way-too-big clearance, since they won't close all the way.

If they're OK, turn the cam to the #1-TDC marks. Then turn the crank directly to the TDC mark & put on a new belt. DOHC engines with higher compression are more likely to bend valves. Just 'cause it's an interference engine, doesn't guarantee anything. It's still dumb luck whether a piston hits a valve while the camshaft is coasting to a stop.

 

Thanks, Ill try that

 

It may be just fine, I broke the timing belt on my D16z6 w/184,000mi at 3000-3500rpm and had no damage. just depends on your luck