| Blown engine?? - Click HERE for Original Thread |
| GsiTurbo |
This was one of those situtations that one would normally read about...
I was heading back to town on HWY21 coming back from Cooking Lake area...cruising back after having a wonderful day windsurfing.
Anyhow...I am going about the speed limit or so, all of the sudden, I hear that loud cling, woom sort of a noise coming from under the hood....I see smoke coming out as well. I shut the engine off and I pull over....
THere is no visible damage outside of the engine...no puddle of oil or anything (thankfully).....I start the engine again....runs very rough - I find out its the cyl #4 that is dead. Besides, the engine is making that constant cling.....cling.cling.cling.....cling...type of a noise....definitely something is hitting internally, as I can feel the vibration on the engine. I dont think its the valves hitting the piston, as the engine is not interfering, but could be the valvetrain. Well, I will know for sure on Sunday, when its gonna go apart...
Wish me luck! :( :unsure: |
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| Mekanik22 |
This could be a case of "Engine Knocking". It is when combustion takes place BEFORE it has reached top dead center to compress the air/fuel mixture. This usually sounds like someone is tapping on the engine with a hammer.
The absolute worse it can be is a broken connecting rod, which I don't think it is. But yes, get that serviced ASAP. |
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| djshortys |
quote:
Originally posted by Mekanik22@Jun 18 2003, 08:14 PM
This could be a case of "Engine Knocking". It is when combustion takes place BEFORE it has reached top dead center to compress the air/fuel mixture. This usually sounds like someone is tapping on the engine with a hammer.
The absolute worse it can be is a broken connecting rod. But yes, get that serviced ASAP.
thanks tips, ill remember the copy and paste mode next time!
andy! |
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| Mekanik22 |
quote:
Originally posted by djshortys@Jun 18 2003, 08:17 PM
quote:
Originally posted by Mekanik22@Jun 18 2003, 08:14 PM
This could be a case of "Engine Knocking". It is when combustion takes place BEFORE it has reached top dead center to compress the air/fuel mixture. This usually sounds like someone is tapping on the engine with a hammer.
The absolute worse it can be is a broken connecting rod. But yes, get that serviced ASAP.
thanks tips, ill remember the copy and paste mode next time!
andy!
what the hell are you talking about? :blink: |
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| Nimbusgti |
| It is rare for one cylinder to knock at idle. Without seeing the car myself it is hard to diagnose but i would say that it could be bearings most likely rod or valvetrain. Take a quick oil pressure test it may give you some insight. |
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| djshortys |
quote:
Originally posted by Mekanik22@Jun 18 2003, 08:19 PM
quote:
Originally posted by djshortys@Jun 18 2003, 08:17 PM
quote:
Originally posted by Mekanik22@Jun 18 2003, 08:14 PM
This could be a case of "Engine Knocking". It is when combustion takes place BEFORE it has reached top dead center to compress the air/fuel mixture. This usually sounds like someone is tapping on the engine with a hammer.
The absolute worse it can be is a broken connecting rod. But yes, get that serviced ASAP.
thanks tips, ill remember the copy and paste mode next time!
andy!
what the hell are you talking about? :blink:
your vast reserch on engine knockin.... ;)
andy! |
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| GsiTurbo |
the good news is that I can still crank the engine with a wrench...spark plugs seem ok, have no time to check further, but on Sunday the engine is going "under" anyhow ...will have pics to post.
The oil pressure is normal (as per gauge) - like nothing happened. I hope its a valvetrain-related....but could be worse.... I was going to pull the engine apart, but I wasnt planning on doing that untill the end of the season anyways.
In the worse-case scenario I see the either the valve bent under some strange angle and stuck in this position, causing piston to hit it - but this 'cling' kind of a noise is intermittent, not constant, so I really dunno. Other scenario is busted piston...I should stop thinking about it...the more I think of it, the more I worry!!!
l8r, |
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| SplineZ |
Busted off a valve and its clankin on top of the piston? I dunno, but man that sucks...
Any warnings? Shuddering? funky smell? I hope its nothing major :)
Good luck!
James Z |
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| GsiTurbo |
quote:
Any warnings? Shuddering? funky smell?
Not really, everything was nice and smooth....sounded beatiful under acceleration...just like someone would turn the switch on. Must have been the red 325is (on older one) that I rather took 10 minutes earlier.
BTW, were you driving onto the Haverlack on the weekend? I might have seen ya, but dunno.
Cheers!! |
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| SplineZ |
quote:
Originally posted by GsiTurbo@Jun 18 2003, 11:22 PM
quote:
Any warnings? Shuddering? funky smell?
Not really, everything was nice and smooth....sounded beatiful under acceleration...just like someone would turn the switch on. Must have been the red 325is (on older one) that I rather took 10 minutes earlier.
BTW, were you driving onto the Haverlack on the weekend? I might have seen ya, but dunno.
Cheers!!
Probly :)
Me you and pidsta should get together one of these days go for coffee or something.. one of the days you 2 get off work at the same time
James Z |
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| HKSpowers |
| Sounds like 100% a bearing! thats what my engine sounded like when it went. Just cling cling cling and very loud almost like a machine gun. |
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| ChromeDragon |
You mean spun a crank bearing? or what?
if he spun a crank bearing it could be doing this, obviously oil flow onto the crank journal would cease. The only thing I could see causing the sound though would be the crank repeatedly siezing and breaking loose from the bearing with the inertia of the engine......who knows though really, I didn't spend enough time as a heavy duty mechanic to see tons of situations.
Chromey |
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| Badazz |
| Its very rare for a berring to just "go". if your cilender is gone. it cold be a broken ring or rings, thiswould give you masive amounts of piston slap and no compresion. all and all i hope it did not take out you bottom end as well. |
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| IH8V8S |
;) I'd tend towards a broken ring as well. The other thing those sunbird turbo motors are know for are weak cam shafts. Could the cam have worn on that one cylinder or possibly even broke? If it's a high pitched clinking sound then it's probably not a bottom end bearing but something in the valvetrain. Again, could be a broken valve spring and the valve has fallen down enough to where the piston can tap it occasionally. Guess you'll find out when you get it apart!
That's why I have a rotary; no valvetrain, less problems! B)
Good luck!
Krazy Karl :wacko: |
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| Anonymoose |
quote:
Originally posted by IH8V8S@Jun 21 2003, 08:25 AM
That's why I have a rotary; no valvetrain, less problems! B)
Heh, cute. I think blown apex seals are quite the problem. |
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| IH8V8S |
quote:
Originally posted by Anonymoose@Jun 21 2003, 05:45 PM
quote:
Originally posted by IH8V8S@Jun 21 2003, 08:25 AM
That's why I have a rotary; no valvetrain, less problems! B)
Heh, cute. I think blown apex seals are quite the problem.
:D A common misconception! A blown apex seal only occurs due to detonation, high mileage, or excessive RPM. In my new engine I will be using high compression rotors, ceramic apex seals, and dual apex seal springs. This and some extra oil pressure should make my engine run to 9500rpm without a hint of trouble. So if all goes well I will see you guys at the track in a few weeks1
Krazy Karl :wacko: |
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