750 Crankshaft:big end journals

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pierodn

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Please,
i have to regrind the big end journals.
The measurement now is 43,96 mm.
I don't know the stock measurement of the journals.
May be i have to go to a new -030 BRG Shells ?
Please, could i know the original measurement of the big end journals.
Thank you.
Piero
 
Start with 1.7500" to 1.7505" per factory for stock new condition.

It is very important to specify 0.090" filet radiuses. The crank grinder may be reluctant to dress the grinding wheel for this so get it in writing.
 
Dances with Shrapnel said:
Start with 1.7500" to 1.7505" per factory for stock new condition.

It is very important to specify 0.090" filet radiuses. The crank grinder may be reluctant to dress the grinding wheel for this so get it in writing.
Click to expand...

Hi and thank you for helping me.
Please, can you let me better understand what means 0,090 filet radiuses?
Ciao
Piero
 
Hi Les thank you.
Sorry, but on the workshop manual don't say what means 0.90 face radius.
Thank you the same.
Ciao
Piero
 
pierodn said:
Sorry, but on the workshop manual don't say what means 0.90 face radius.
Click to expand...

It does.

Three times on that page = ".090" RAD. IMPORTANT" and "GRIND THE CRANKPIN TO ....... DIA WITH .090" FACE RADIUS"
 
Sometimes a picture helps ....

750 Crankshaft:big end journals


Slick
 
Last edited:
pierodn said:
Hi Les thank you.
Sorry, but on the workshop manual don't say what means 0.90 face radius.
Thank you the same.
Ciao
Piero
Click to expand...


The face radius is where the journal meets the flanks of the crank. There has to be a gentle curve here otherwise the crank could crack.
 
pommie john said:
pierodn said:
Hi Les thank you.
Sorry, but on the workshop manual don't say what means 0.90 face radius.
Thank you the same.
Ciao
Piero
Click to expand...


The face radius is where the journal meets the flanks of the crank. There has to be a gentle curve here otherwise the crank could crack.
Click to expand...

Hi and thank you.
Now i mean.
Ciao
Piero
 
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