Crankshaft journal repair

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Kthomas

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I suppose I will need to have my crankshaft journals turned ? There is just an ever so slight ridge. I t almost looks to be where the oil hole in the plain bearing wasn’t chamfered or ? You can’t really see the ridge on the journal but you can feel it and you can see it on the shell.
I wasn’t going to redo this crankshaft but I started obsessing about spots where the previous owner ( or factory ) marked the cap position with a scribe or chisel or something. The rods felt great prior to pulling. They had no discernible play and fell nice , slow and smooth.
Any advice appreciated :
I guess I need to order oversized shells with new rods. Maybe RGM or MAP
 
Measure it by micrometer to be sure.
The small chisel type mark on one side is common (for correct reassembly) so would not worry about it.
It could be as simple as polishing the journals, new shells (RGM and AN seem to be different as far as the surface material) and new nuts on the OEM bolts.

Rod1.jpg
 
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Thanks
Ill mic them and see what I have. I guess I thought if there was any ridge at all I should have it turned but maybe not ? What is the best way to polish the journals ?
 
If you are having the journals turned the machinist needs to impart the proper radius at the ends of the journals. This is illustrated in the shop manual. Many machinist don't have the proper tool or knowledge to do this. It may be best to send it to a Norton Specialist.
 
Kthomas said:
I suppose I will need to have my crankshaft journals turned ? There is just an ever so slight ridge. I t almost looks to be where the oil hole in the plain bearing wasn’t chamfered or ? You can’t really see the ridge on the journal but you can feel it and you can see it on the shell.
I wasn’t going to redo this crankshaft but I started obsessing about spots where the previous owner ( or factory ) marked the cap position with a scribe or chisel or something. The rods felt great prior to pulling. They had no discernible play and fell nice , slow and smooth.
Any advice appreciated :
I guess I need to order oversized shells with new rods. Maybe RGM or MAP
Click to expand...
Hi,
I will sale the steel Carillo rods from the Sunburst becouse I will put the long rods from Jim Schmidt. the rods have only 2.000 kms
PM me if intrested
Yves
 
Kthomas said:
Thanks
Ill mic them and see what I have. I guess I thought if there was any ridge at all I should have it turned but maybe not ? What is the best way to polish the journals ?
Click to expand...

You sound more than up to speed on things.
My optimism hopes the ridge is not a ridge and a clean and measure will reveal a journal that still has decent life in it.
Until that is verified within 0.0001's it is ?

The fillet radius thing is the cart after the horse and any decent grinder (mine does) will ask you for the fillet spec on paper and the the desired clearance. (supply rods and new shells, torqued to spec, I personally send them with new bolts as needed and old nuts with the locking ring machined off as applicable )

The only thing I have found is if replacing standard shells on a good 1.750 journal is the running clearance can be in the 0.0015 to 0.002" range (on a good journal) (The reason I used RGM shells when I had both those and AN at hand)
Not a problem on a regrind with the rod bore able to be measured to grind to size.

I see no problem with the stock parts as long as they are within spec, my opinion will always be (until proven otherwise) Norton rods fail due to A - Idiots sending the tacho needle round to Made in UK or B- loss or lack of oil pressure.
 
Time Warp said:
You sound more than up to speed on things.
My optimism hopes the ridge is not a ridge and a clean and measure will reveal a journal that still has decent life in it.
Until that is verified within 0.0001's it is ?

The fillet radius thing is the cart after the horse and any decent grinder (mine does) will ask you for the fillet spec on paper and the the desired clearance. (supply rods and new shells, torqued to spec, I personally send them with new bolts as needed and old nuts with the locking ring machined off as applicable )

The only thing I have found is if replacing standard shells on a good 1.750 journal is the running clearance can be in the 0.0015 to 0.002" range (on a good journal) (The reason I used RGM shells when I had both those and AN at hand)
Not a problem on a regrind with the rod bore able to be measured to grind to size.

I see no problem with the stock parts as long as they are within spec, my opinion will always be (until proven otherwise) Norton rods fail due to A - Idiots sending the tacho needle round to Made in UK or B- loss or lack of oil pressure.
Click to expand...
 
I spent a little time today measuring and polishing. ( Not much on the polishing )
With a micrometer I was getting 1.752 on both sides . I played a little bit with some 1200 grit wet and dry. Ridge is hardly noticeable. Yves I sent you a message asking how much and where are you privately ( I think ) but im not that good with controls on this site.
 
The crankshaft must be disassembled before gronding each half. I chose to do that part myself.
 
And mark the flywheel before taking the journals off so you know which way round it goes.
 
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