my altenator belt snapped

[RSdriver98]

Ok so I'm goin down the road and my altenator belt snapped. Ok fixed that and the old belt got stuck in the crank and I got it out. With the new belt on I tried to crank it up, well it cranks over but will not start. Tried to have someone jump me and it still did not start. Doesn't seem to be the battery because lights, radio and everything works fine, but it will not start. Help please. I need to know something ASAP.

 

[bullettdsm]

Sorry, you're going to have to check timing. Your alternator belt may very well have screwed up your timing belt by getting in the crank area.

MB

 

[RSdriver98]

Timing belt seems ok. The motor cranks over but will not start. Do you think it could be a fuse blown?

 

[broads72]

Check your timing. I would also charge the battery completely, not just jump start it. I would guess that you cranked the crap out of it and even though accessories work, it's probably dead.

 

[TofastForU_99]

Check timing... the belt could of made it jump a tooth or 2 and it could be causing your valves to open at the wrong time and you wont get any compression so the car would not start

 

[RSdriver98]

Could that have messed up any valves, because I just fully rebuilt my head last month and I dont want to go through that again.

 

[bullettdsm]

Ok so I'm goin down the road and my altenator belt snapped. Ok fixed that and the old belt got stuck in the crank and I got it out. .

Lets look here a little closer; where in the crank did it get stuck? Did it get wrapped around the alternator pulley? Or did it wrapped into the back of the pulley?

Reason I'm asking (as the reason that I mentioned timing) is that your timing belt could still be in place, but the crank may have jumped some teeth if the belt got caught up in the timing belt (of which I suspect). You could get the old alternator belt out and the timing belt on the crank could fall back into the grooves but it would fall back into the wrong position. Hence, the belt would still turn with the gears, just be in the wrong position.

MB

 

[RSdriver98]

It was stuck behind the harmonic balancer. So I say that the timing may be off.

If my timing belt still looks to be in good shape, do you think I need to replace it?

 

[bullettdsm]

Could that have messed up any valves, because I just fully rebuilt my head last month and I dont want to go through that again.

(Boy, just more bad news to bear ) Yes, it could have screwed up the valves. BUT check hard timing first, before you get worried about anything. Step at a time. IF the timing is off, you could have gotten lucky, and you could not have. At this point the damage is done (if there is any).

If you are thinking of re-using the belt (if she skipped) I would recommend against it. Think about all you have riding on a possibly compromised timing belt. Is that what, $60(?), saved worth it?

MB

 

[rbwtrans]

It sounds like bullitdsm is on the right track with the timing. I just wanted to add that maybe you should check that the cams are turning. Most of the time when a timing belt "breaks" it only strips off a few teeth at the crank. (While you have the cover off, roll it to TDC and verify that everything IS lined up correctly)

 

[RSdriver98]

Okay, here's the video to give you guys a visual and sound of what is going on exactly.

YouTube - Engine Trouble.

 

[brassc2007]

Hold up a minute sorry i posted 1 bad detail in that last post i misread and though you had the 4g motor you have the same motor i do the crankshaft position sensor is located on the back of the block near the oil filter housing and should be a three prong plug. The fuses to check should be located in the engine bay and maybe a few under the dash in the engine bay i would check all the fuses the alternator fuse and the main engine fuse but as it turns over that prob aint it

 

[mindset]

Well if it jumped a tooth, then its timing... obviously.
I'm not a timing expert but I'd try and set everything back to TDC. Then restart it.

 

[RSdriver98]

So, basically, my timing is off enough to prevent it from starting?

I don't hear the ticking of valve destruction, so I don't think it's too far off.

How many teeth would the belt have to be off to prevent starting?

Also, what would cause the alternator belt to just slide off like it did?

 

[lacroixdp]

So, basically, my timing is off enough to prevent it from starting?

I don't hear the ticking of valve destruction, so I don't think it's too far off.

How many teeth would the belt have to be off to prevent starting?

Also, what would cause the alternator belt to just slide off like it did?

It's quite possible it's off enough to prevent it from starting. Before you try cranking it any more, I'd STRONGLY suggest you check your timing, along with changing that belt.

 

[mindset]

So, basically, my timing is off enough to prevent it from starting?

I don't hear the ticking of valve destruction, so I don't think it's too far off.

How many teeth would the belt have to be off to prevent starting?

Also, what would cause the alternator belt to just slide off like it did?

I mean I don't see why not. It could be off more than you think it is too.
No clue on how many teeth.
I do not want to give you any wrong info considering I don't know too much about 420a's but it could be because of the belt tensioner. They go bad on 4g63s if they're aren't replaced after a certain mileage.

 

[Locke]

Belt is trash, replace it. It'd be best to replace the tensioner and idler with it, and would be a good time to do the water pump.

Check the cam timing before replacing the belt, to make sure this is the no-start issue - turn the crank until cylinder #1 is at TDC, and make sure the marks on the cam sprockets are facing each other, and on a line with the top of the cylinder head.

 

[RSdriver98]

Okay, pulled the VC, checked the timing, this is what I got...

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Timing appears to be correct, or are there other factors that can affect it?

BTW, I'm aware that the belt is ####ed.

 

[Lofty]

Hmm. Does your alternator spin freely?
A seized bearing in your alternator could have caused it to slide off like that, as well as the no start issue.
Not sure though, just trying to help you out buddy.

 

[RSdriver98]

Alternator spins perfectly free.

Here's my question, if the timing was off at all, the timing marks on the cam gears wouldn't line up. Correct?

 

[Lofty]

Correct.
Now I'm stumped.

 

[RSdriver98]

Well shit. I am too at the moment. If anyone has any more ideas, feel free to throw them by me. I've got the battery on the charger now, and I'll give it a try tomorrow, when it has a fresh charge.

As of now, I'm about to get some sleep.

I'm tired.

 

[Lofty]

Did you check ALL the fuses?
I'm not too sure where your crank position sensor is, but you might have jagged that up with your belt.

 

[RSdriver98]

To be honest, I'm not sure what fuses to check.

Which ones should I look at?

I would assume fuel pump, but I'm not even sure there is a fuse for that...

I'm going to try and take everything apart tomorrow morning and see what I can find. I know that I'm going to be replacing the timing belt for sure due to it's condition, but if anyone else has any suggestions please feel free to let me know. I'm sort of stumped at this point.

 

[brassc2007]

Check the crankshaft position sensor it is located behind the timing cover and its bout 1 inch over and 3-4 inches up from the bottom of the block im not sure if you had the whole timeing cover off or not but maybe there is a small piece of belt in there or the wires came off maybe that tells it when to fire. Have you check for spark yet if the crank position sensor is messed up or bad you will not have spark. a engine cant run unless it has spark, fuel, and air, kinda basic i know