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knighthawks3
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Jul 8, 2009, 10:18 AM
Post #1 of 11
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nocking in engine
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im working on my mother inlaws car its a 1990 geo prizm with a 1.6 engine.it had a very bad nock while driving but nothing in park or neutral.i was driving it to her house and the nocking stopped and the car died.i thought maybe cam shaft but i took the top of cams are fine but there is alot of oil on 2 of the 4 spark plugs.she just bought this car and they told her they just replaced everything above the head.im thinking piston threw the head?
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Loren Champlain Sr
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/ Moderator
Jul 8, 2009, 10:23 AM
Post #2 of 11
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Re: nocking in engine
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nighthawk; Without being able to 'hear' the knock, it's tough from here. Which two plugs are oil fouled? Try using a long screwdriver with your ear to the handle to try and find the area that the knock is coming from. Could be a pre-ignition knock or worse. Of course, take safety precautions when doing this with a running engine.
Loren
SW Washington
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knighthawks3
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Jul 8, 2009, 10:27 AM
Post #3 of 11
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Re: nocking in engine
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im sorry forgot to mention after it died it wont start now and it getting very little compretion.from all the oil on the plugs im assumming.i think it was 3 and 4 but cars not here to double check.
(This post was edited by knighthawks3 on Jul 8, 2009, 10:29 AM)
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Loren Champlain Sr
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Jul 8, 2009, 10:34 AM
Post #4 of 11
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Re: nocking in engine
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Remove, clean, and dry all of the spark plugs. Which two cylinders have the oil? See if you can get it started afterwards. May want to take a compression test on all four while the plugs are out. You'll probably get a higher reading on the oil fouled cylinders, but post the results.
Loren
SW Washington
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knighthawks3
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Jul 9, 2009, 9:32 AM
Post #5 of 11
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Re: nocking in engine
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found the problem.one of the piston arms broke and is wedged between the shaft.fun fun !!!!!!!!!!!!!!!!any handy tips on how to replace it without taking head off.ive never had to do this type of repair.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 9, 2009, 10:00 AM
Post #6 of 11
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Re: nocking in engine
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You are kidding, right?
Not only will you have to remove the head but there is a very good chance that the crankshaft and block are damaged and not reusable.
You just need a rebuilt engine (long block) to repair that car.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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knighthawks3
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Jul 9, 2009, 10:06 AM
Post #7 of 11
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Re: nocking in engine
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the arm broke when i was trying to turn it over.i took the oil pan off and looked inside everything looked o.k. from that view.but ill remove the head and look and see forsure.ill let you no tomarow if i see anything.only paid 500 for the car not worth changeing engine.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 9, 2009, 10:10 AM
Post #8 of 11
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Re: nocking in engine
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If this engine broke or threw a connecting rod, unless you are trained in what to look for, don't even take it apart. You are going to cause more problems then you can imagine. You need to measure things with micrometers and really know what you are doing. You can't just mix all those parts together. Everything has to go back in the exact spot and position it came out
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
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Jul 9, 2009, 10:49 AM
Post #9 of 11
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Re: nocking in engine
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knighthawks; What did you remove in order to 'see' this? Valve cover? Are you referring to a 'rocker arm'. The 'connecting rod' attaches the piston to the crankshaft and this is not something that you can 'see' without at least removing the oil pan and cylinder head. So, I'm wondering just what you are actually seeing?
Loren
SW Washington
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knighthawks3
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Jul 9, 2009, 11:38 AM
Post #10 of 11
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Re: nocking in engine
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took off oil pan
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Loren Champlain Sr
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Jul 9, 2009, 11:40 AM
Post #11 of 11
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Re: nocking in engine
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Refer to Hammer's reply. If it 'threw' a connecting rod, the engine is history. Sorry.
Loren
SW Washington
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