No compression across the board

[Smitherines]

Hiya guys, just got my first dsm, got he rnot running.

I checked the compression, with 0 across the board on each cylinder. Ive tried two different gauges with no avail. I took off my valve cover, and Im suspecting valves are bent, is there anyway without taking the head off tocheck if the valves are operating properly?

 

[nukefission]

A leakdown test will tell you for sure. Was this car involved in any timing belt mishaps?

 

[Smitherines]

I dont know man, the kid before me said that he was driving it (mind you the car is still stock apart from the k&n airfilter, and it died out after driving it for 5 mins, I think the tensioner gave, but still, I need to find out if these valves are dead or not. He only had it for three months, and it was sitting there for two.

 

[xcelr8n]

That sounds alot like an engine feckery to me buddy.
Timing belt probably said sayonara and you'll most likely need a full rebuild or used engine replacement.

 

[dr1665]

That sounds alot like an engine feckery to me buddy.
Timing belt probably said sayonara and you'll most likely need a full rebuild or used engine replacement.

Feckery. Good word!

And ditto.

 

[Smitherines]

Well Id like to narrow down the possibilities. Bent valves, thats pretty common, right ? I mean pulling the head off is a huge job I dont wanna tackle just yet if I dont have to, and why would i need a new engine, is the short block bad too ?

 

[nukefission]

If all the vavles are bent, you would only need to pull the head off and replace them. No reason you should have to replace the whole motor.

 

[Smitherines]

and also, the timing belt is still intact, and it looks pretty good. The timing is off, at TDC the dowels are at 1:30, so I think that its just bent valves, and at most Id need the top half of the engine. My original question was how could I check for proper valve movements without taking the head off?

 

[xcelr8n]

Ya, pull the head off, but if the valves are bent, what do you think bent them?
DING DING, the pistons!! You may get lucky but if this guy was driving when it happened whose to say he wasnt at 4500rpms or more when it happened... Engines are unforgiving when there internal workings smash into each other at a high rate of speed.
Good Luck.

 

[xcelr8n]

Also, how many teeth is 1:30, like how many teeth advanced are the cams? I think the general conscensus is 1-2 your ok, 2-3 theres potential damage and more than 3, well you get the pattern.

 

[99gst_racer]

Next step = Leakdown test
http://www.dsmgrrrl.com/FAQs/leakdown.htm

This will help determine whether the problem is the head gasket (unlikely), the piston rings (possibility), or bent valves (probable).

 

[Smitherines]

ya know somethin, all the intake valves are bent. at least Im assuming that, because the valves arent meeting the cam lobes. but not the exhaust valves, so it musta hit the intake valves on the intake stroke, so Im thinking maybe the balance shaft belt broke? Im gonna rip the head off anyways this weekend.

 

[Pure92TSi]

Here is a quick way to tell if valves are kissing pistons. Take a 1/2 inch drive ratchet and put it in the crank sprocket bolt. Turn the motor over clockwise with the spark plugs out. If it feels like something is stopping it from rolling over and you can't do it without applying A LOT of force then your valves are hitting your pistons. Sometimes you can audibly hear them hit.

 

[Smitherines]

I do remember there being some force when they were getting near the top....*sigh* That mean the pistons are bad?

 

[Pure92TSi]

No just because the valves hit the pistons doesn't mean your pistons are bad. Everyone of my intake valves hit my pistons a while back and all my pisonts are fine. You will know if they hit you probably won't be able to turn the motor over at all once one of the valves touches the piston.

 

[bojanglesracing]

I take it the motor turn over. i got a 91 talon and was told the same thing it cranked over so i try to start it. did some looking the motor cranked dut the timeing belt stay still. turns out the cam locked up (he was low on oil) and ripped the teeth off the belt. maybe check that.

 

[Smitherines]

No, the timing belt is moving actually, the cams are still timed together, so it must of jumped on either the crank or the oil pump, but my question is why? My guess is the tensioner was giving way and the guy nailed the gas and it slipped. But another thing that boggles my mind is the timing belt is still original, or least it appears that way. I can almost guarantee the tensioner is original and that should been replaced at 80k. Shes got 112k on it now so thats almost double. Assholes. Lol. Also, the car is stock, but the guy put a walbro 255 in there? Could that of lead to anything? I still have the stock pump though. And two computers. Theres an 1/8 of an inch gap between all the valves and cam lobes on the intake cam.

P.S. The timing belt still looks like it has all of its teeth, and that the teeth are actually in very good condition.

 

[Smitherines]

No just because the valves hit the pistons doesn't mean your pistons are bad. Everyone of my intake valves hit my pistons a while back and all my pisonts are fine. You will know if they hit you probably won't be able to turn the motor over at all once one of the valves touches the piston.

Keep in mind they didnt bent with me, I got it like that, so that guy ###### tried starting it 50 times, and the pistons kept smashing into the intake valves.


What the hell is bad about the word -p-r-o-l-l-y-?

 

[Pure92TSi]

Keep in mind they didnt bent with me, I got it like that, so that guy ###### tried starting it 50 times, and the pistons kept smashing into the intake valves.


What the hell is bad about the word -p-r-o-l-l-y-?

That doesn't matter. I did the same with mine because I just thought that it was flooded because it happened right after I installed my AFPR and it was set on like 60 psi. So i tried cranking it over a lot for a couple of days and when i tried to do it by hand like I told you about it would go up and stop and that's when I could tell the valves were hitting. Just give it a try and see what you figure out.

With the new warning system you have to almost perfect with your grammar and spelling or you will get a warning. I got one because I wasn't pay attention and put "u" intsead of you. Oh well.

 

[mobythevan]

My car is the same story, belt looked good, all teeth OK, 0 compression across the board. Pulled the valve cover and all the intake rockers are loose, wiggle all over the place Bent all intake valves but no exhaust, no what the problem was? I pulled the timing cover and the belt was loose as hell, bad auto tensioner, bad tensioner pulley and bad idler pulley. None of those parts had ever been replaced when the previous 2 timing belts were done by the PO. 130K on car right now and all of that stuff is getting replaced this time.

 

[Smitherines]

My car is the same story, belt looked good, all teeth OK, 0 compression across the board. Pulled the valve cover and all the intake rockers are loose, wiggle all over the place Bent all intake valves but no exhaust, no what the problem was? I pulled the timing cover and the belt was loose as hell, bad auto tensioner, bad tensioner pulley and bad idler pulley. None of those parts had ever been replaced when the previous 2 timing belts were done by the PO. 130K on car right now and all of that stuff is getting replaced this time.

Its still down right now? Did anything else happen to the engine? My timing belt still feels pretty tight on top of the cams, I havent taken off the lower timing belt cover yet, its way too cold out up here. Im gonna rip the engine apart anyways this sunday.

 

[PieEyedPiper]

What the hell is bad about the word -p-r-o-l-l-y-?

Well for starters, its not a word, and it makes you sound like an eleven year old girl yapping to her friend on msn.
It's an adult world with an adult literacy level.

*prays he didn't mispell anythang*

 

[mobythevan]

Its still down right now? Did anything else happen to the engine? My timing belt still feels pretty tight on top of the cams, I havent taken off the lower timing belt cover yet, its way too cold out up here. Im gonna rip the engine apart anyways this sunday.

Yeah, its still down right now. Pulled the head and inpsected the pistons, they are OK. I know what this engine was doing when the valves hit, it was only idling, was just fired up. The previous owner is a good friend of mine, he just can't do the engine work himself so gave up on the car. The timing belt was tight up on the cams, but very loose down below once I pulled the lower cover off to check it out. The head is at the machine shop right now and they estimated 350-450 for the rebuild before they tore into it. Have fun. With the rest of the parts it will run me around $800 to have the car up and running again.

 

[Smitherines]

Thats what I was figuring for my car, Im gonna get all new timing components, water pump, the ralliart head gasket. And I hope to god the head and pistons are alright. Like I said Im gonna rip her apart and try to get the head in on sunday if Mitsubishi Graveyard is open, and I should get it back tuesday or wednesday, then Ill just have to stop at a mitsu dealer and get all the stuff I need to get. did you take out your radiator when you disassembled the motor?

 

[Pure92TSi]

No you don't need to take out the radiator when you pull the head.