2ndGenToyotaFan
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Sooooooo I get a call on Monday from a friend who says their 92 V6 4Runner isn't running right.... They are only about 400 miles away, on a road trip, so I say that if it'll make it here I'll see what I can do.
The truck makes it here Monday night, and I take a look. It's clearly missing on a few cylinders, and the engine is bucking all over the engine bay as well.... So Tuesday I take it to my dads shop, and after a little diagnosing, I find a dead cylinder on number 4... 0 psi.... So that leads me to believe that it has a valve issue. Pop the valve cover, and sure enough, the valve shim is missing out of the bucket, and the bucket is sitting low in it's hole.... So off comes the cam shaft, and out comes the bucket.... Broken valve spring! Great! nothing too bad right?
So I stick a spare valve spring in, and the valve comes up right to where it should be, so I figure the valve didn't get popped by the piston.... Time to put it back together.... So I get it all together and fire it up, sounds great, runs like a top!!! Test drive time! 4 minutes later... BA BA BA BA BA BA BA BA BA BA noise and vibration felt through the floor, and it dies........ Tow it back to dads.... Off comes the valve cover, #4 exhaust now has 0 clearance.... Off comes the head... Turns out it dropped the valve head into the cylinder.... Head and piston look like they've been beat to death with a pick axe....
Ok, so I order a head gasket set, and get to work cleaning up the head, and dropping the pan to swap the piston out... Somewhere in here I notice that the engine will only turn over about 358 dergrees, before it is stopped by something... I eliminate the trans by pushing the clutch in, and I pull the oil pump off to make sure it isn't that.... Then I look down the open intake valve hole on the #1 cylinder, and with the valve open I can see chunks of aluminum.... Off comes the passenger side head..... I found chunks of aluminum in all 6 cylinders after this.
Turns out that when the valve head broke off, it mangled the intake valve so bad that it allowed the chunks to get blown back up into the intake and spread around to all the cylinders... and there were enough in #1 to stop it from turning over....
So, should you ever find that you have a broken valve spring, TAKE OFF THE #($*$&#*@(@#($* HEAD BEFORE YOU DO A @(#*$ THING!!!!!!
Lesson learned..... I need a class of milk...
The truck makes it here Monday night, and I take a look. It's clearly missing on a few cylinders, and the engine is bucking all over the engine bay as well.... So Tuesday I take it to my dads shop, and after a little diagnosing, I find a dead cylinder on number 4... 0 psi.... So that leads me to believe that it has a valve issue. Pop the valve cover, and sure enough, the valve shim is missing out of the bucket, and the bucket is sitting low in it's hole.... So off comes the cam shaft, and out comes the bucket.... Broken valve spring! Great! nothing too bad right?
So I stick a spare valve spring in, and the valve comes up right to where it should be, so I figure the valve didn't get popped by the piston.... Time to put it back together.... So I get it all together and fire it up, sounds great, runs like a top!!! Test drive time! 4 minutes later... BA BA BA BA BA BA BA BA BA BA noise and vibration felt through the floor, and it dies........ Tow it back to dads.... Off comes the valve cover, #4 exhaust now has 0 clearance.... Off comes the head... Turns out it dropped the valve head into the cylinder.... Head and piston look like they've been beat to death with a pick axe....
Ok, so I order a head gasket set, and get to work cleaning up the head, and dropping the pan to swap the piston out... Somewhere in here I notice that the engine will only turn over about 358 dergrees, before it is stopped by something... I eliminate the trans by pushing the clutch in, and I pull the oil pump off to make sure it isn't that.... Then I look down the open intake valve hole on the #1 cylinder, and with the valve open I can see chunks of aluminum.... Off comes the passenger side head..... I found chunks of aluminum in all 6 cylinders after this.
Turns out that when the valve head broke off, it mangled the intake valve so bad that it allowed the chunks to get blown back up into the intake and spread around to all the cylinders... and there were enough in #1 to stop it from turning over....
So, should you ever find that you have a broken valve spring, TAKE OFF THE #($*$&#*@(@#($* HEAD BEFORE YOU DO A @(#*$ THING!!!!!!
Lesson learned..... I need a class of milk...
I'll try to get a pic of the carnage tomorrow..... 
