teal_dx

I have a D16z6 build to handle boost. Bought it used in need of a rebuild. I had it bored .020, 75.5 SRP forged pistons, eagle rods, had crank micropolished, and a professional builder assembeled the bearings & bottom end and did all the machine work. I have been driving it NA to break it in easy. it has 1600 miles, about 400 ago it started to get a little noisy. The noise got worse recently so I stopped driving it. It was definitely rod knock.
I was able to go through the bottom of the engine to check all the bearings so I wouldn't have to pull put the whole motor.
I called the builder and he said to bring in the bearings for him to look at.

Here's the tear down pics...





First lets have a close look at the main bearings and see what you all think...


some signs of wear, but I don't know from experience if that amount is normal or not.

I looked at the crank surfaces for any signs of wear...


main 1


main2


main3


main4


main5

And now on to the rods...
First I took pics of each rod end to look for signs of discoloring due to excessive heat...


rod #1


rod #2


rod #3



rod #4

Look at Rod #2 at the crank... it is a different color than the other pics, and you can see it again in the background of the rod #3 pic. #2 bearing is probably bad and generating a lot of heat, but the rod end looks normal even though the crank looks like it saw some high temperatures.

Now for the Rod Bearings:





Rod #1 Bearings




There's the crank surface for the #1 Rod bearings.






#2 Rod Bearings


There's the crank surface for the #2 Rod bearings. This is the one that got hot and discolored.




#3 Rod Bearings


Crank surface for the #3 Rod bearings.




#4 Rod Bearings




Crank surface for the #4 Rod bearings.

#2 is surely where the knock was coming from. I'm going to bring the bearings to the builder next weekend. I wanted to get some opinions from you guys too.
Do I need to have the crank micropolished, or does the surface look ok?
I've only seen used bearings that were in horrible condition, how do my bearings look (I know #2 rod bearing is bad, what about the others, do they look to have "normal" wear?)




Modified by teal_dx at 11:40 AM 9/7/2007

civicstar

i would polish the crank, ive seen worst but it should clean up, cut and maybe go undersized on the rod bearings but have it measured first

92_civic

looks like all the bearings are hurtin a bit for only 1600 miles n/a

if it were me in your shoes I would pull the motor back out, have the crank re-polished and the have the crank re-nitrated(spell?) to restore the coating that is on the crank if it were factory

can you catch a fingernail on any marks on the crankshaft?
what bearings are you using?

also when this motor was built the first time were the bearing specs checked with plasti-gague or was it done with a micrometer and a dial bore indicator?

my b18c is in ten times worse shape and still fixable...sucks though you only got 1600 n/a miles out of it