Walterronny

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!

1HGEJ2

iTrader: (1)

did u checked bearing clearence? had this engine before a bearing problem?

Walterronny

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.

Walterronny

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.

1HGEJ2

iTrader: (1)

i think the engine wasnt very clean inside. these are old flakes in the pan.

Walterronny

Everything was ultrasonic cleaned. engine head was cleaned and after was shaved.. maybe any fine chip? i dont know

Cupajoe

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.

Hatch Man

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