0 compression no start

[Bud92gsx]

Is 0 compression even possible?

That would lead to a no start right

 

[1qkfwd]

Needs compression for combustion.

 

[Dsmkauai]

Timing belt break, or jump a few teeth?

 

[undefined0000]

What exactly is going on? Got 0 compression on all 4 cylinders If so, something is pretty screwed, my guess would be timing is COMPLETELY off?

 

[Bud92gsx]

t belt looks good..Its gonna get replaced but its in the right spot im pretty sure.

 

[SonySlave]

Yes it is possible to have zero compression. A burnt valve(s) or valve(s) bent enough to not seal at all could cause zero compression. Scorched pistons could do it as well. Usually one dead cylinder isn't enough to keep the car from starting but two or more very likely is enough. With one dead the car will usually run extremely rough but not dead. It would sound like a Subaru with an exhaust.

Was this after a motor rebuild? Did this just happen suddenly? How many cylinders are 0 compression? Which ones? Timing marks lined up? We need a lot more information to answer this fully.

 

[Bud92gsx]

Update..Exhaust cam jumped a tooth.So theoritically re time it and it should be back to normal right?

 

[undefined0000]

If it was just one tooth, I don't see any super duper head damage happening, other guys would know more, never had it happen.

 

[BogusSVO]

Update..Exhaust cam jumped a tooth.So theoritically re time it and it should be back to normal right?

The question is now, Why did it jump a tooth?

But yes, re-time and run a leakdown/compression test.

 

[bryanwheat]

With it just being 1 tooth off there still should be some compression. Zero compression would make you think that the valves are bent.

 

[BogusSVO]

bryan, I would have to agree with you. But it makes me wonder if the dowel on the cam sheared and the timing is off more than 1 tooth.

 

[bryanwheat]

bryan, I would have to agree with you. But it makes me wonder if the dowel on the cam sheared and the timing is off more than 1 tooth.

I have seen that a few times. That would make more sense than it bending the valves with it only being 1 tooth off.

 

[Dsmkauai]

I had my gst jump timing on me once, it must have happen right as I turned the car off. Then the next morning I went to start and it didn't want to run, went thru all the basics. Only to find out the timing jumped 1 tooth I believe the exhaust also. Anyway changed everything that goes with timing job and it was just fine after. Make sure to change the hydrolic tensioner as its probably whats at fault.

 

[jhowell34]

Haha i got same problem pulling head off tomorrow

0 compression equals bent valve even if timing was off u would still have compression

 

[Bud92gsx]

Its a newer rebuild on the head so i'm hoping i didnt screw something up.

But I just got the t belt redone.Battery charger is on there now.I'll see if it starts in a lil bit.

But Dale I'm hoping your not right about bending valves.

 

[Bud92gsx]

Edit..F*** you dale and bryan.

Its a no start.

 

[VisegripMech]

If I ever got ZERO compression on ALL cylinders the first thing I check is the compression checker.

 

[Bud92gsx]

Edit 2..Took of the manifold cyl 1 was abosolutely soakedddddd...

I think i'm gonna go with a bogus head this time.Bogus head, thats hilarious.

 

[Bud92gsx]

EDIT 3 found why it jumped timing..Tenioner arm aint putting tension on shit.

 

[BogusSVO]

Did you pull the cam gears and check the dowel pin?

Did you pull the VC and check for kicked rocker arms?

 

[Bud92gsx]

No I did not..How do i check them?

 

[buhay6]

Take off your valve cover (12 10mm bolts) and check that your rocker arms are all lined up on the cam lobes and lifters. Also be a good idea to look for damage to the cam and rocker arms as in pitting deep gouges or scoring.(VC= valve cover)
You will need to take the Valve cover off anyways to check your cam gear down pins.
To take off your cams gears you need to take off the timing belt and valve cover. Look at your cam they have nut like thing cast into the shaft its self between the 2nd and 3rd cam cap back from the cam gears which is to hold or turn the cams manually. I believe a 24mm wrench fits them then take another wrench or a socket and ratchet to remove the bolt that bolts the cam gear onto the cam shaft (17mm). The Cam shafts are "keyed" and have whats called dowl pins that slid into both keys on the shaft and cam gear to keep them from spinning on each other kind of like a lock so to say.

I'd take pictures so to show you what your looking for but my comps down so I'm only using my smart phone, hope the info above is enough. Let us know what you find and if you need torque spec's I could get them for you.

 

[Bud92gsx]

I'm getting fuel and spark..But still cranks to 0 compression.

Could i be doing it wrong.

 

[Diamond Star Werks]

I'm getting fuel and spark..But still cranks to 0 compression.

Could i be doing it wrong.

0 compression means you have no rings, bent/stuck open valves, or no check valve in your gauge, or your timing is off.

 

[Dsmkauai]

If you jumped timing it probably bent some valves. When you discovered the timing jumped how many teeth was it off?