Topic: Crank install

[bambuhiphop]

Ok, so first off let me apologize in advance if this is in the wrong place. I did some searches but just couldn't hit pay dirt.

So, I am working on reassembling the case for my 550. I have my pretty APE crank, new bearings, and cleaned up rods from mrieck (along with upgraded bolts and nuts).

I am trying to figure out the order in which I should put this all back together. My feeling is I should put the rods on the crank and then mount into the case before I join the halves... Is that the right approach or is there a better way???

Any help or direction to a thread this has been covered would be very appreciated.

This is what I am working with so far...

[johno]

Damn nice start captain hip hop 

yes to your question,  rods on crank then crank in case.  you could do a bearing clearance check with plastigauge just to make sure you didnt make a mistake with the letter numbers on crank , rods and case.  Before you do the final assembly with goo.    If the journals look good and the numbers are similiar I just do a random check on one BE and one main,  but thats just lazy ol me.

Have you epoxy painted the inside of the cases for oil flow return ?

cheers johno

[bambuhiphop]

Damn nice start captain hip hop 

yes to your question,  rods on crank then crank in case.  you could do a bearing clearance check with plastigauge just to make sure you didnt make a mistake with the letter numbers on crank , rods and case.  Before you do the final assembly with goo.    If the journals look good and the numbers are similiar I just do a random check on one BE and one main,  but thats just lazy ol me.

Have you epoxy painted the inside of the cases for oil flow return ?

cheers johno

Sweet, thanks for the info. First CB motor I have put together so making sure I ask the "dumb" questions!

I painted the interior with Glyptal. One reason was so oil wouldn't pool and move through better, yes.

[vfourfreak]

Don't forget the cam chain.
Looks delicious.

Kev

[SOHC4 Cafe Racer Fan]

Just put it in a glass case and stare at it.   

[Justind97]

I did this exact same setup recently.  I found it easiest to mount the rods on the crank with the crank removed from the cases.  Remember the 3 steps of torquing the rod bolts down and make sure you do it 3 times total to stretch the bolts.
6 ft/lbs, 12 ft/lbs and 18.8ft/lbs, 

Having two people to do it is best.  one to hold the crank and the other to do the torquing.

Then install the HiVo chain and away you go.

Did you machine those case halves?  It looks a little bit too clean to have not been done.

[bambuhiphop]

I did this exact same setup recently.  I found it easiest to mount the rods on the crank with the crank removed from the cases.  Remember the 3 steps of torquing the rod bolts down and make sure you do it 3 times total to stretch the bolts.
6 ft/lbs, 12 ft/lbs and 18.8ft/lbs, 

Having two people to do it is best.  one to hold the crank and the other to do the torquing.

Then install the HiVo chain and away you go.

Did you machine those case halves?  It looks a little bit too clean to have not been done.

Thanks for the step on the stretching. Do you loosen after 6 and 12? Or just tighten to 6, then 12, then 18.8?

No machining. The outer parts of the case were mineral blasted. Interior was soda blasted. Then I took a brass cup brush (many actually) and went over every interior (non bearing) surface. Cleaned with denatured alcohol and then applied the Glyptal. For the gasket and bearing surfaces I used a red and grey scotch brite pad with denatured alcohol with light pressure. Then wiped down with more denatured and coffee filters. The flash makes it look slightly better... but not much This might be a better look at the real shine:

[Justind97]

No loosening until you've done a full round from 6-18.8 

Tighten it gradually using the steps and then loosen it off and start over.   Just ensures everything is good to roll.

Cheers!