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Old 02-05-2006, 12:30 PM   #1 (permalink)
nx2000

 
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What causes engine to seize?

I just bought another nx2000 with seized engine (tried manualy turning flywheel) didin't do anything. starter was making click sound but couldn't crank the engine.

So I plan to remove vavle cover and go on from there. any tips what to look for? The timing chain?
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Old 02-05-2006, 01:47 PM   #2 (permalink)
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main bearings
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Old 02-05-2006, 01:48 PM   #3 (permalink)
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no oil would cause the crank to weld itself to the mains.
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Old 02-05-2006, 01:48 PM   #4 (permalink)
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pop the VC and see how sludged it is also, if it is nasty in there you can bet on oil starvation.
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Old 02-05-2006, 03:48 PM   #5 (permalink)
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took off intake trottle body has oil spit around it.
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Old 02-05-2006, 10:42 PM   #6 (permalink)
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that could be blowby from worn rings.
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Old 02-05-2006, 11:22 PM   #7 (permalink)
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you reied to spin the flywheel by hand? you take the plugs out?...other wise your trying to turn a compressed motor....lol. try a breaker bar or long 1/2 drive w/ correct socket on the crank bolt. NOW if it dont turn, its prolly seized. check your oil level lately?
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Old 02-06-2006, 01:41 PM   #8 (permalink)
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plugs are dry no water, but engine doesn't turn
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Old 02-06-2006, 02:00 PM   #9 (permalink)
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Wow this a good uh tech article

I mean sux for your engine siezing but it's a god tech article

Ya know what I mean?

sorry to hear that
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Old 02-06-2006, 09:06 PM   #10 (permalink)
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Well under valve cover everything looks like it should for an engine with some miles.

what are my next steps... go see what happend to the pistons? If I do that probably need to adjust camshafts later and buy new gaskets plus other stuff.


engine oil was black but full and antifreeze was like new. So i don't think it it was oil starvation that killed it. what happens when you misshift? and go revlimiter?

Can transmission cause this problem? the car rolls fine in neutral

Last edited by vstolyarov; 02-06-2006 at 09:18 PM.
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Old 02-06-2006, 09:27 PM   #11 (permalink)
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If you miss shift most likely It would be throwing a rod or something valvetrain related


But then again an engine would still crank

Last edited by Nismo20VVL; 02-06-2006 at 09:28 PM.
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Old 02-06-2006, 10:07 PM   #12 (permalink)
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mis shifting usualy breaks rocker arms.
If you threw a rod you'd know by a hole in the side of your block.
If the oil was very thin and old its possible that even though it wasn't oil starved, the oil just wasn't lubricating properly and your engine could still overheat and seize.
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Old 02-06-2006, 10:29 PM   #13 (permalink)
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how should pistons be located, what is the symmetry? it might be one of them is not in its proper place. I can measure the height through spark plug hole. My dad sais that 2 of them should be symmetrical to each other?
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Old 02-07-2006, 12:54 AM   #14 (permalink)
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yeah 1 and 4 2 and 3 go side by side on height. the motor may be hydro locked as well just pop the head off check the cylinder walls and try to turn it over with no head on it just make sure when you put the head back on you have the timing marks lined up according to the FSM. if you need an FSM theres some floating around the boards or you can contribute and get one that way.
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Old 02-07-2006, 01:07 AM   #15 (permalink)
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that motor looks toasted. That is a starvation problem it should be honey gold color.
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Old 02-07-2006, 01:46 AM   #16 (permalink)
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Quote:
Originally Posted by evilsr20degg
yeah 1 and 4 2 and 3 go side by side on height. the motor may be hydro locked as well just pop the head off check the cylinder walls and try to turn it over with no head on it just make sure when you put the head back on you have the timing marks lined up according to the FSM. if you need an FSM theres some floating around the boards or you can contribute and get one that way.

I have heard about that but what exactly happens what how does it seize the engine?
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Old 02-07-2006, 10:00 AM   #17 (permalink)
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http://www.prepsparkplugs.com/frames.htm

Hydrostatic lock, hydraulic lock or hydrolock occurs when liquids, typically water, enter an engine cylinder. This can occur from a coolant, oil or fuel leak, but the chief cause is drawing water into the engine through the air induction system (airbox & filter, ducting, throttle body or carburetor, intake manifold). Internal combustion engines (spark or compression ignition) operating on a two-stroke or four-stroke cycle must employ a compression stroke to compress the charge (usually an air/fuel mixture). Liquids are incompressible; the presence of a liquid in the engine cylinder during the compression stroke generates destructively high cylinder pressures.

Abnormally high cylinder pressures can bend and break pistons, piston pins, connecting rods, crankshafts and ruin bearings and can crack or break cylinder heads and engine blocks. Small amounts of liquids may pass through an engine cycle without damage, but volumes exceeding 40cc (1.4 fluid ounces, <3 tablespoons) will cause many engines to develop cylinder pressures well in excess of 1000psi. A larger volume of water, up to the combustion chamber volume (usually 60cc to 100cc), will generate increasingly high cylinder pressure during the completion of the compression stroke. Volumes of water which exceed the combustion chamber volume will "stop" a running engine through true hydrostatic lock. Something expensive always bends or breaks when this happens.

Hydrolock may occur while the engine is running, the work of the compression stroke being supplied by engine's rotational inertia. Or a liquid may leak into the cylinder while the engine is being stored; the work of the compression stroke will be supplied by the starter motor.

Hydrolock is not a new problem, but it only affected certain applications. Older American made cars, particularly with V-configuration engines, often employed an air intake location which was high in the engine compartment. Because of the reduced tendency of these older American cars to hydrolock, it has not been in the forefront of design consideration and is not a household term.

Most newer, fuel injected cars have the air intake located low in the engine compartment. The objective of this low air intake is to draw cool air into the engine. Unfortunately, when driving through sufficiently deep standing or splashing water, engine vacuum from the intake stroke will suck water into the engine, particularly if the intake is submerged.

The cost to repair hydrolock damage begins at about $1000.00, and only goes sky high from there. Repair bills in excess of $35,000 have been reported in high-end passenger cars. Racing engines can cost twice that amount. Many new cars have been recognized as having poor designs to prevent hydrolock. Even some Four-Wheel-Drive pickup trucks and SUV's have been identified as having particularly high incidence rates of hydrolock. Manufacturers' warranties do not cover hydrolock engine damage, stating that the cause of operator error. One SUV manufacturer states the maximum vehicle speed through standing water to be 5 mph; hydrolock occurring at speeds in excess of 5 mph is judged to be operator error. The repair may be covered by a vehicle's Collision/Comprehensive insurance.

Last edited by evilsr20degg; 02-07-2006 at 10:02 AM.
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Old 02-07-2006, 12:53 PM   #18 (permalink)
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Wow great explination and detail :d

Thanx
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