Author Topic: Pitting & Journals - Can I reuse this crankshaft?  (Read 1408 times)

Online chaterlea25

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #30 on: 28.02. 2019 19:04 »
Hi Simon,
I would move the steady back onto the main journal position
Have you the drive side clocked up in a 4 jaw chuck?
A 3 jaw will tell lies *eek*
Only then can you assess if / how much the end is running out
Small errors  could maybe be trued up by
Fitting a drilled to suit bar over the there's end and  "tweaking"

The more I see of what is going on with that crank the more i think its junk  *sad2*

John
1961 Super Rocket
1963 RGS (ongoing)

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #31 on: 28.02. 2019 19:16 »
Hi Simon,
I would move the steady back onto the main journal position
Have you the drive side clocked up in a 4 jaw chuck?
A 3 jaw will tell lies *eek*
Only then can you assess if / how much the end is running out
Small errors  could maybe be trued up by
Fitting a drilled to suit bar over the there's end and  "tweaking"
John
I agree with John, it can be tweaked once the crank is set up right.
Remove the step on the thrust face and make a new bush. Job done.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #32 on: 28.02. 2019 19:36 »
Hi Simon,
I would move the steady back onto the main journal position
Have you the drive side clocked up in a 4 jaw chuck?
A 3 jaw will tell lies *eek*
Only then can you assess if / how much the end is running out
Small errors  could maybe be trued up by
Fitting a drilled to suit bar over the there's end and  "tweaking"

The more I see of what is going on with that crank the more i think its junk  *sad2*

John

If I end up doing anything to this crank, I'm going to set it up in my ER40 collet chuck. Before I do that, I need to modify the steady - unfortunately the crank web hits the foot of the steady at the moment.
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #33 on: 28.02. 2019 20:46 »
Hi All,
I don't like the look of the rust and crap on the outside of that bush housing *sad2*
If it's an original outer has the bush sleeve been pinned to it? It needs to be!
In an awful lot of cases the original bush has lost its proper interference fit

John

No evidence of any pinning. How are they usually done? Just something to stop the inner bush spinning?
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline berger

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #34 on: 28.02. 2019 21:19 »
the two steel backed ones I found in the shed  have a stepped steel pin of about 1/8th diameter on the outer reduced to about 3/32 in the bush inbetween the flanged end and the oil groove  , you might find one  if its cleaned up. yours looks different to my two, also the oil holes are drilled at an angle from the steel back into the bush , drilled towards the flanged end which I think then gets the oil ways lined up better , I have the witness marks in the bush from the crank groove and it is perfectly inline with the angled drilled holes

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #35 on: 28.02. 2019 21:37 »
Excellent. So the stepped pin is radial to the bush axis?
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline berger

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #36 on: 28.02. 2019 21:55 »
yes simon --, when you mentioned oil groove alignment I think I have answered your problem and your steel bit is drilled in the middle of the groove, mine are drilled right on the edge of the groove nearest to the flange at an angle into the bush which then gets everything in line

Online ironhead

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #37 on: 28.02. 2019 22:56 »
G'day Simon,
Probably the best thing to do with the 2 piece bush is "bin" it.
Make sure the hole in the crankcase is bored true ( round & straight) then make a solid bush to suit.
I've done this many times & works fine. I think this was discussed recently somewhere on here.
With the thread clean up, the way I have done the "bashed THOR ends" *rant* in the past is mounting the crank in the lathe. 4 jaw drive side , fixed steady on the existing R/H main journal & chasing the thread via single point tool (60 degree) & gearbox setting ( 20 tpi) . Its also a good time to re-instate the centre drilling with a fine pointed tool for future use.
SA

Offline Swarfcut

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #38 on: 01.03. 2019 12:23 »
 Simon  That bush looks to have started life as a standard steel backed composite bush, from which someone has removed the inner thin walled bearing material and pressed in a custom bush. Alas, while allowing reclaimation of the well worn crank, the oil holes appear to be not quite right, and as you have found, the bush is not pegged.

 I'd go with the sound advice from Ironhead, bin the bush, start afresh  and add some oil ways and oil drillings in the right place. Line boring the case to clean it up, install the bush then line bore again to the crank running clearance gives the best result.  The outer end of the main journal is usually flush with the outer face of the bush, so bear this in mind  if you decide to make a new one. The thread run out is the deal breaker here......maybe it is just too much hassle to turn the pig's ear into a thing of beauty.

 Swarfy.

 Swarfy.

Offline SimonHolyfield

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cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #40 on: 02.03. 2019 18:31 »
G'day Simon.
That one is pinned. The smaller hole at 10 O'clock.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #41 on: 04.03. 2019 19:05 »
I've done a bit more work on the crankshaft today. There are a few pictures, so I have documented progress here:

https://ariel-square-four.blogspot.com/2019/03/fh-crankshaft-2-cleanup.html

Comments & encouragement gratefully received as always!
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline Swarfcut

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #42 on: 04.03. 2019 20:05 »
Simon.... The most luxurious backyard engineering I have ever seen. I await the sludge trap extravaganza.

Swarfy.

Offline SimonHolyfield

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cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline cyclobutch

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #44 on: 05.03. 2019 11:57 »
Enjoying this now, keep it coming ...
Various, including ...
'58 Iron Head Flash Bitza