Knock noise after rebuild B16

 
Old 02-23-2018, 01:51 PM
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Default Knock noise after rebuild B16

Hi there, im having a problem with a rebuild B16 i did, never had any problem , i rebuild many engines with not problem, what's why i dont know where could be the problem. everything was checkend, kings bearings STD size, new pistons rings, new oil pump,etc.

I have to say some details, first start of this engine , took a lot of time to get it runs, never had a problem with first start, normally take a bit but not too long as this one engine. Im thinking maybe fuel was mixed with oil then oil isnt lubricate correctly, using Motul 10W40, nothing special.

engine is around 3-4 hours only, when it rev noise dissapear, tried to heard it with stethoscope, noise came from 3 rod, but it's weird, only happen when it's cold, after 4-5 min, engine sounds very very smooth.

then i decided to remove oil pan for inspect for anything, found this fine chips, removec 3 rod cap and this is what i found, marks arent deep, decided to recheck crank endfload and 3 rod endloaf and everything is OK, about 0.12mm for crank and 0.11mm for rod.

http://i65.tinypic.com/6glv0o.jpg
http://i64.tinypic.com/2hphw10.jpg
http://i68.tinypic.com/292tbu1.jpg
http://i65.tinypic.com/2ldybu8.jpg
http://i63.tinypic.com/16a6v5t.jpg

Any help will be appreciate it a lot. Thanks!
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Old 02-23-2018, 06:37 PM
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Default Re: Knock noise after rebuild B16

did u checked bearing clearence? had this engine before a bearing problem?
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Old 02-24-2018, 06:06 AM
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Default Re: Knock noise after rebuild B16

yes, always. all between specs, i'd say a bit clearance than normal but into specs (0.06mm limit)), i know kings bearings give a bit clearance normally, never had any problems with these.

what i dont understand is why just in cold , normally when an engine has rod knock is always. yes, engine had a bit similar noise before. i even got crank micropolished for got get everything good.
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Old 02-24-2018, 07:35 AM
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Default Re: Knock noise after rebuild B16

got 1 really damaged...

http://i63.tinypic.com/rjmxwn.jpg

Why that scratch? any edge? lack of oil?

Four and second one are like this:

http://i64.tinypic.com/2dklhkk.jpg

Any input will be appreciate it.
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Old 02-24-2018, 09:36 AM
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Default Re: Knock noise after rebuild B16

i think the engine wasnt very clean inside. these are old flakes in the pan.
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Old 02-24-2018, 04:30 PM
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Default Re: Knock noise after rebuild B16

Everything was ultrasonic cleaned. engine head was cleaned and after was shaved.. maybe any fine chip? i dont know
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Old 03-14-2018, 07:25 AM
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Default Re: Knock noise after rebuild B16

I think some kind of shaving in somewhere got into bearing and messed it up.

Replace bearing in car and hope for the best is what I would do.

Hell I would replace all rod bearings in car.
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Old 03-29-2018, 08:04 AM
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Default Re: Knock noise after rebuild B16

are you certain that you checked the clearances on both sides of the crank?
it could have been out of round.... i see that you purchased king bearings, which are one-size-fits all.

many times journals have different specs, and sometimes they need two different bearing sizes in one journal as well..

did you do your **** without lube btw? >:D

EDIT: also, are you sure the caps were for the correct journal as well? hey, we all do dumb crap sometimes
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