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just bought a super dupra, noob to the car
ok so here's its story.
i bought the car for 200 bucks, according to the lady i bought it from the timing belt broke and when it did that it broke something in the no. 3 cylinder. i have no idea wat broke im pretty sure it wasnt the piston could've been a valve but again im not sure. i just did a compression check and the rings arent fried so that good. i know im gonna have to take the head off but other than that, thats about all i know. so my question is: with the information i just gave you guys how complicated is this gonna be? |
Supras have non-interference engines. What that means is, when the timing belt breaks, it doesn't break anything internally. The pistons won't smash into the valves or anything like that. So eit must have another issue, whether it be rod knock or something else.
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so what could have been the things of metal that they picked out of the cylinder
i have rebuilt my civic SI motor and my h22 prelude, but this car has me stumped |
I can almost guarantee you that it wasn't valve pieces unless the timing belt broke around 6500rpms.
And how were things "picked out of the cylinder"? Did someone stick a magnet down the spark plug hole or what? |
no it wasnt 6.5k it was idling i think, she said she reached to kill the engine and BAM!!!
as for the peices, let me inform you as to who looked at this car: long story short the same mechanic that looked at the supra also tryed to convince that my prelude DESPITE the H badges all over the car was in fact a mis-badged nissan, top quality japanese car technician so in truth i really have no idea how or what was picked out of the cylinder so it could only be a sparkplug then? cuz i have never heard of a spark plug actually exploding |
Why are you assuming it is a spark plug now? And an exploding one at that? It seems you were spoon fed a buttload of misinformation and are now trying to work around that.
Nuke all that crap from your mind right now. Go pick up a Haynes or Chilton's manual for the Supra and start reading. Serious. It's probably something really dumb like a forgotten ground wire, or hell, maybe they didn't put the timing belt on right and it's timed incorrect. At any rate you need to rediagnose the car yourself. When you turn the key on and then crank it, what does it do? Are there any knocking or tapping noises coming from the engine? Does it spin over fast or normal? Need YOUR diagnosis, not that silly lady and he half-wit mechanic's. |
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i do have the haynes manual and i have read almost the whole thing, that doesnt mean i know what happened to the car the battery is as dead as a door nail, NOTHING cranks up |
step 1. replace battery
step 2. turn the key over, crank it and see what happens (and listen to hear any knocking) you're obviously smart enough to run a compression test. what were the numbers? |
C1: 160psi
C2: 158psi C3: ??? C4: 162psi C5: 156psi C6: 163psi we arent real sure about C3 we got psi numbers consistent with a freightliner truck so im in the process of rechecking that one, there was some oil in the valley between the cams that the spark plugs sit in, does that mean anything? |
freightliner truck? what does that mean? very high psi or very low?
the other numbers seem good, fairly consistant. the oil between the cam towers is either the valve covers or cam tower gaskets leaking, a pretty common issiue with these engines after so many years/miles. |
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210 isn't outrageous, but it is a little suspicious. more than likely there is oil sitting utop the cylinder, either caused by bad rings on that piston, leaky valve stem seals or worn valve guides.
was the spark plug in that cylinder kind of oily? |
ther was no spark plug in the number 3 cylinder
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OY...
this whole situation is a big headache for me just trying to understand wtf is going on here. so no spark plug, doesn't mean it exploded, just means that someone is an assclown, removed it and didn't put it back... OR... didn't tighten it and the compression blew it out of the cylinder when someone tried to start the engine. |
a head ache for you? you dont even own the damn thing!! imagine how I feel!
anyway, the compression didnt blow it out there is no scaring at all to threading, so far everybody is telling me that the sparkplug detonated when the timing belt blew, but those two things arent neccesarily connected to eachother, i think it was just bad timing*no pun intended* |
I mean it's a headache just trying to figure it out through typed words on the internet, it's hard to grasp what is going on here.
As far as the spark plug goes, I highly doubt that it detonated to the point it just 'disappeared'. There's no sign of the spark plug right? I find that very improbable. Shine a flashlight into the spark plug hole and see if you can see anything that doesn't look right, like metal chunks. The top of the piston should look black from carbon, which is normal. |
all six cylinders are black.
nad |
all six cylinders are black.
and yes there is no sign of the spark plug, but as you said before, that is probably the result of the mechanics not knowing what they're doing |
possible reason for high comp in 3 is high carbon build up. I read about a civic that had a static compression of 13:1 (from normal 9.5:1ish) just from carbon build up and ran race fuel until he rebuilt the engine. Speaking of, if you've rebuilt 2 engines already you should have a strong grasp on whats going on because really...an engine is an engine...unless it's a wankel. Ask the car these questions 1) are you getting air 2) are you getting fuel (how long was it sitting aka bad gas) 3) are you getting spark. of course if cam or spark timing are off it may not run as stated previously. check all that and if it still doesn't run suck it up and pull the head.
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