Hi!
My very first post here turns out to be a question for absolute professionals, as I still got no clue after very profound research.
Please, excuse my somewhat crappy English, as I'm no native speaker.

I'm going to rebuild my 2001 H22A with 55 mm main journals.
I found the common marks for the journal bores on the block, but a completely unmarked crankshaft inside. Never seen that before.
Nothing on the counterweights, nothing next to the journals, nothing on the front face. No stamps, no engravings, no marks of any kind, just milled faces where the common marks should have been.

That's not a problem for journal 1, 2, 4 and 5, as I got the colour marks on the bearings clearly visible, but they are gone on Nr. 3.
Both bearing halfs on Nr. 3 got different part numbers stamped on their backsides, and they differ from all other bearings, too.

The 1997-2001 Prelude factory manual mentions all specs and tolerances for the 50 mm main journals, but not for the 55 mm ones. Only clearances and the common combinations for colour codes, Block and crank marks.

So, let's see what we've got here.

Block marking for main journbal bores: 33334

Crank: unmarked

Bearing 1: black/brown
Bearing 2: black/brown
Bearing 3: ??/??
Bearing 4: brown/green
Bearing 5: brown/green

Black: Taiho Part No. 7119D
Brown: 7121D
Green: 7127D
Bearing 3: Taiho 7D44C & 7121D

Taiho never answered my questions for these codes. Honda doesn't know Taiho part numbers, only their own, which are completely different of course.

Journals, as measured by myself:
1: 54.972 mm 

2: 54.968 mm 

3: 54.985 mm 

4: 54.980 mm 

5: 54.982 mm

That suits perfectly to the colour codes for 1 & 2, as the manual says:
black/brown in a bore marked 3 would be a journal marked 4 on position 1 and marked 6 on position 2.
Journal 2 is the smallest and would clearly equal a 6 marking. Journal 2 is the second smallest an should fit to be a 4.
Journals 4 & 5 are in the middle of the tolerances, and might be a 2 and a 3 as to the colour codes, or maybe a 3 and a 2 as to my measurements.

Journal 3 is the biggest, but what the heck is it?

Sadly, I got no micrometer caliper to measure from 0 mm upwards, my smallest starts at 25 mm.

Best regards,
Sven

 

I think I understand but I'm still a bit confused...
#3 crank journal is bigger than the rest? Is this a factory crank? I thought #3 main is supposed to have a hair more bearing clearance than the others...

I think you should measure the bearing thickness (buy the correct mic) or maybe swap bearings with another main and check it with some plastiguage just to get an idea if the crank has been machined and how these mystery bearings for main #3 compare to the other oem bearings.
Weird...