Timing Belt Slipped - What steps do I take now?

[broox]

So basically I tried to start my car the other day and got a horrible sound (video here), so I took the timing belt cover off to find that the belt was not in the teeth. Pics here and here.

My only question is, what do I do now? Where do I start looking?

I'm not looking for a cut and dry answer to what's wrong. I just want to know what steps to take to figure it out...

Thanks for your help.

 

[1g_tsi_awd]

Timing belt tensioner took a shit would be my first guess.

 

[broox]

right - but i'm not looking for what the problem might be. i just want to know how to figure out what really did happen and how much damage was caused...

like if it was just the tensioner - should i just buy a new tensioner and belt and try to start the car? if a rod is bent or valve is broken will i even be able to turn the timing belt?

just trying to figure out which steps to take first. i just don't want to take the block apart if there are 10 other/easier things to check first.

 

[broox]

Finally found instructions on how to remove the head and such here: http://www.dsmtuners.com/forums/showthread.php?t=259332

However, I'm still not sure if that is the first option I should take... Can you do a compression test if the starter isn't turning the engine over?

 

[95blackGsTurbo]

No you have to turn the car over for a compression test. However you can realign the timing belt and put #1 cylinder to TDC and do a leak down test that will let you know if you have valves that are leaking.

 

[Jeff_Ciesielski]

what to do:

Remove your timing belt completely, rotate your cams to TDC ( i.e. dowel pins strait up ) If you cant rotate your cams, try rotating your crank so that the pistons are all in the middle of the stroke. Do a leak down test, which will tell you if your valves are bent.

 

[Jeff_Ciesielski]

haha, you beat me to it

 

[broox]

finally! thanks for the help guys.

i was beginning to think all the people with knowledge stopped visiting dsmtuners.

so i just researched the leakdown test a little bit. how important is that gauge? i assume it's pretty important to know how much pressure each cylinder holds and for how long - but, can't i just put the compressed air into the spark plug hole and listen for escaping air to know if my valves are leaking?

if the gauge is that important, where do i get one? can they be rented?

thanks again!

 

[Defiant]

Save the work. Your valves are bent. It's probably still cheaper to pick up a rebuilt head than to do it yourself. But shelve that old head for a couple of years, for when the get more scarce. Your pistons will probably be marred but undamaged. Scrape/sand off any sharp edges and you will be fine until the next thing breaks.

 

[broox]

so, it's easiest to get a whole new head as to replace valves, i'm assuming...

and while i'm at it i get a new timing belt, new gaskets, a new pulley (which i assume is what broke for the timing belt to slip)... that it?

 

[toyotaturbo]

Save the work. Your valves are bent. It's probably still cheaper to pick up a rebuilt head than to do it yourself. But shelve that old head for a couple of years, for when the get more scarce. Your pistons will probably be marred but undamaged. Scrape/sand off any sharp edges and you will be fine until the next thing breaks.

That's what I was going to say.....your intake valves are history. Probably some of your exhaust valves as well. I've been through this a few times. What I do every time is: find a head in the junkyard. $40 later, car runs. Keep your bent valve head so that you can port, polish and put big valves in it when you have the money.

On a side note....

We bought a '92 Laser awd that was not running. Timing belt was tight..... but the engine was "locked". Hmmm.....I took the head off it only to find......Valves LAYING in each cylinder!! The valve stem was also laying next to each valve (2 different pieces!!). #2 took the worst of it. It had a huge chunk in it from the valve hitting it. We went to the local boneyard and pulled the head off a '91 Eclipse GS. Head looked okay. Ground down the chunk and strapped the head on with a mls head gasket. In short, it works GREAT! Boosts up to 15psi no problem.
The moral of this is: As long as no valves went through the piston, this may not be so bad.

 

[BUCK]

My only question is, what do I do now? Where do I start looking? I'm not looking for a cut and dry answer to what's wrong. I just want to know what steps to take to figure it out... Thanks for your help.

CORRECT, just Pull the Radiator, jerk the Head, Intake & Exhaust as an ASSEMBLY & PASS on further time wasting diagnostics - & PLAN on doing the BSE while you are "IN THERE" - Good Luck

 

[91talonawdtsi]

If your timing belt jumps about one tooth or two could you be lucky enough not to have bent any valves just put my motor back together and started it and ran for about five seconds then just wouldnts start but turns over easily with no noise in the engine so i check the timing belt and i would say its about one tooth off on the crank maybe maybe two when the cam pulleys still line up?