Installing, Plastigauging and Measuring Bearing Clearances

[honduh_head]

post up any links you find... here's some i found:

http://www.c-speedracing.com/howto/bearings/bearings.php

http://www.honda-tech.com/showthread.php?t=2714858

[fRoSt]

nice find. i think there might be some more good info on this...

[king06]

How to correctly measure for bearings
http://www.honda-tech.com/showthread.php?t=1706658


How to use plastigauge
http://www.plastigaugeusa.com/how.html

[king06]

Here is a chart of Honda B series bearing thickness by color. To calculate actual bearing clearance, use the following formula:

BC = IDBT – ODC – (2 x BT)

BC = bearing clearance
IDBT = inside diameter of bearing tunnel (housing bore)
ODC = outside diameter of crank journal
BT = bearing thickness

Main Bearing thickness by color
Blue 2.013-2.010 mm 0.0793”- 0.0791”
Black 2.010-2.007 mm 0.0791”- 0.0790”
Brown 2.007-2.004 mm 0.0790”- 0.0789”
Green 2.004-2.001 mm 0.0789”- 0.0788”
Yellow 2.001-1.998 mm 0.0788”- 0.0787”
Pink 1.998-1.995 mm 0.0787”- 0.0785”
Red 1.995-1.992 mm 0.0785”- 0.0783”

Rod bearing thickness by color
Blue 1.510-1.507 mm 0.0594”- 0.0593”
Black 1.507-1.504 mm 0.0593”- 0.0592”
Brown 1.504-1.501 mm 0.0592”- 0.0591”
Green 1.501-1.498 mm 0.0591”- 0.0590”
Yellow 1.498-1.495 mm 0.0590”- 0.0589”
Pink 1.495-1.492 mm 0.0589”- 0.0587”
Red 1.492-1.489 mm 0.0587”- 0.0586”

[Atomic-Orange-Turbo-Sloth]

this is where im glad i had 25+ hours on this exact thing at MMI, not only did i have to do it and do it correctly during a final, but i had to run the machine afterwards.

and my instructor ran the piss outta that crf250.

main thing you always always always gotta pay attention to, proper torque specs and bolt torque procedure, go by the book or you wont get the right clearance and will F*$# up your motor.

[redwidow]

My old crank used ACL's STD .079 P#5M1959 and was at .015 across the board. (this crank had been turned and polished)

My new crank I tried the same ACL's which are equal to the size of a black or brown by the sizing chart gave me .0008 way to tight I went to the ACL RACE series (HX) they gave me .001 more clearance and I came in at .0018 across the board. This crank was as stock as they come which leaves me room to clean up if need down the road. On a side note I really like the ACL Race HX bearings they have a chamfer slot that gives oil travel to the bottom half of the bearing. Should have taken pics to post but im sure it can be found on the web somewhere.

here is a good thread on bearings
http://www.honda-tech.com/showthread.php?t=715490

and ACL CHART
http://www.aclus.com/content/ACL07%281%29.pdf

[king06]

My old crank used ACL's STD .079 P#5M1959 and was at .015 across the board. (this crank had been turned and polished)

My new crank I tried the same ACL's which are equal to the size of a black or brown by the sizing chart gave me .0008 way to tight I went to the ACL RACE series (HX) they gave me .001 more clearance and I came in at .0018 across the board. This crank was as stock as they come which leaves me room to clean up if need down the road. On a side note I really like the ACL Race HX bearings they have a chamfer slot that gives oil travel to the bottom half of the bearing. Should have taken pics to post but im sure it can be found on the web somewhere.


So you had to buy one set of bearings just to find out you were too tight and buy another set?

[redwidow]

My old crank used ACL's STD .079 P#5M1959 and was at .015 across the board. (this crank had been turned and polished)

My new crank I tried the same ACL's which are equal to the size of a black or brown by the sizing chart gave me .0008 way to tight I went to the ACL RACE series (HX) they gave me .001 more clearance and I came in at .0018 across the board. This crank was as stock as they come which leaves me room to clean up if need down the road. On a side note I really like the ACL Race HX bearings they have a chamfer slot that gives oil travel to the bottom half of the bearing. Should have taken pics to post but im sure it can be found on the web somewhere.


So you had to buy one set of bearings just to find out you were too tight and buy another set?

yep If I had a bore micrometer would have helped out nicely

[Mop]

Anyone know where to get acls locally? I don't want to wait for shipping. For a d16

[redwidow]

Anyone know where to get acls locally? I don't want to wait for shipping. For a d16

not that i know of but www.nolimitmotorsports.com has the best prices I could find and they still beat most vendors with 2 day shipping...

[Mop]

not that i know of but www.nolimitmotorsports.com has the best prices I could find and they still beat most vendors with 2 day shipping...

thanks. Did you know your original bearing colors where you got a tight clearance of .0008?
I have a couple yellows and pinks. I'm thinking it might come up tight on those journals.

[redwidow]

thanks. Did you know your original bearing colors where you got a tight clearance of .0008?
I have a couple yellows and pinks. I'm thinking it might come up tight on those journals.

I didn't use Honda bearings had ACL's with my old crank this one was stock oem never been turned or polished and if you go by the chart my acl race would be size red. I just use acl because they are cheaper and accomplish the same mission.

Main Bearing thickness by color
Blue 2.013-2.010 mm 0.0793”- 0.0791”
Black 2.010-2.007 mm 0.0791”- 0.0790”
Brown 2.007-2.004 mm 0.0790”- 0.0789”
Green 2.004-2.001 mm 0.0789”- 0.0788”
Yellow 2.001-1.998 mm 0.0788”- 0.0787”
Pink 1.998-1.995 mm 0.0787”- 0.0785”
Red 1.995-1.992 mm 0.0785”- 0.0783”

[turbo4dr]

Wow, great posting OP. Good to see useful information on azht.