SOHC.co.uk Forums > CB350/400

Is it a FRAME UP

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rigwit:
OK.
took tank to a local firm who specialise in top notch paintwork also do frame repairs......... went through what i was after, as a finished starter,  IE monoshock top trunnion mounting plate, rear foot peg hoops taken off, back top tubes cut just after mudguard/seat brace. no probs     .....so frame tank were going that afternoon to blaster (Monday) as didn't want to do any mods or lay out money if frame is past it so waiting for word back how it is, also went to my local engineering firm to see how they were progressing with the work i took, i did mention there were, "no hurries" on the work  but to find out theyhave not done anything so far was a bummer  so threw a bit of money at them to see if that speeds things up  :)  on a downer  main journals n big ends are yellow D  standard  which are not available so Ive a choice can get  green and brown bearings both of which will give a 10 and 20 undersize respectfully, other way is to take it to hindle re-man and see if they can re-metal the original shells back to tippy top------no scores on journals or  housings  and no major wear on bearings  just a few bright patches.........but id like to keep the major parts as standard as poss with out going oversize

Bryanj:
I think you are reading the shell sizes wrong as there are no such thing as undersize shells and your decimal point is in the wrong place, all colours of shell will run on a standard size pin just the oil clearance varies. I have many times built with all black shells and if run in carefully instead of just bedded in no problems arrise

rigwit:

--- Quote from: Bryanj on July 29, 2010, 05:57:17 AM ---I think you are reading the shell sizes wrong as there are no such thing as undersize shells and your decimal point is in the wrong place, all colours of shell will run on a standard size pin just the oil clearance varies. I have many times built with all black shells and if run in carefully instead of just bedded in no problems arrise

--- End quote ---
D yellow is for a +0.008to -0 crankcase allowance, with a journal of +0 to -0.010 giving a running clearance of 20 to 46 u, Green is for a +0.080 to -0 crankcase allowance with a journal size of -0.010 to -0.020, and a running clearance of 22 to 48 u, Brown is for a c/case clearance of +0.008 to -0 and journal allowance of -0.020 to -0.030 and a running clearance of 24 to 50 u so my strip down was  D (yellow) which gives me a c/case allowance of +0.008 to -0 and a starting journal tollerance of +0 to -0.010 to run brown or green the journals depending on how round they are and are not tapered, would need a lick of either 10 or 20 thousandths of an inch to give me anything between 22 to 50 u clearance, or as said ,i could get the shells re-metaled at hindle re-man depending on cost of either green or brown with a journal lick over cost..










d

Bryanj:
PLEASE check the numbers again its casing hole tolerance 0.0009 inch NOT EVEN ONE THOU in which there are 3 steps and same tolerance on PIN with 2 steps which means there are 4 grades of shell to cover a less than 2 thou tolerance gap.

Either your manual is printed wrong or you are looking at metric instead of imperial numbers

rigwit:

--- Quote from: Bryanj on July 29, 2010, 01:40:08 PM ---PLEASE check the numbers again its casing hole tolerance 0.0009 inch NOT EVEN ONE THOU in which there are 3 steps and same tolerance on PIN with 2 steps which means there are 4 grades of shell to cover a less than 2 thou tolerance gap.

Either your manual is printed wrong or you are looking at metric instead of imperial numbers

--- End quote ---
It could be as half of it is in imperial and 1/2 in si units, crank is marked in 3 steps  ie : 1, 2, 3, which to me would mean 1 standard tollerance of original turning, and 2 oversize ( bearings that is) as si units were introduced during the last 18 months of my college training but i still work in imperial and yes ive worked down to u, 5 microns to be presice and on hand turned parts, also used to cast bearings  well the firm i worked for at the time did but we did it  but im buggered if i still have my rifller knifes/files ..........ah that takes me back ds are now showing  D (yellow) big ends but still only green or brown mains will mike up crank and check min/max of housing and work it out from there. 

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