Author Topic: Pitting & Journals - Can I reuse this crankshaft?  (Read 1231 times)

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #45 on: 05.03. 2019 12:08 »
Enjoying this now, keep it coming ...

I've just learned that you have to heat the flywheel to get it on...

I'll be asking for help on that - but not yet, we have a way to go first. I haven't even looked at the rods yet.
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 #46 on: 06.03. 2019 21:34 »
After a lot of measuring, a little machining and a lot of adjusting, I have about 0.6mm run out at the very end of the oil pump worm.

Good enough? The crankshaft timing pinion run out is about 0.05 mm.
cheers

Simes

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

Offline KiwiGF

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #47 on: 06.03. 2019 22:53 »
After a lot of measuring, a little machining and a lot of adjusting, I have about 0.6mm run out at the very end of the oil pump worm.

Good enough? The crankshaft timing pinion run out is about 0.05 mm.

Is the run out caused by a “bent” crank? Or the worm itself. 0.6 mm sounds a lot....
New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

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Armstrong Siddeley Whitley for rainy days (with wife).

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Offline berger

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #48 on: 07.03. 2019 00:12 »
2 thou to 24 thou seems like your end is bent  *eek*pardon the pun ,or as kiwi has said is that with the worm gear on and that's throwing it out- 24 is a lot of bend on your end *whistle*

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #49 on: 14.03. 2019 17:46 »
Plugs out!
cheers

Simes

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

Online muskrat

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #50 on: 14.03. 2019 18:26 »
G'day Simon.
Now you know why we always ask "Did you clean the sludge trap out?" I've seen a lot worse.
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 #51 on: 14.03. 2019 23:09 »
Next question. The big end oil ways are just 3/32" holes. On their own twin, the 500 cc KG/KH, Ariel issued a service bulletin advising owners to grind a 'teardrop' into these holes to distribute oil into the bearing.

Is this advised with the BSA engine?
cheers

Simes

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

Online Swarfcut

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #52 on: 14.03. 2019 23:54 »
Simon... Before having a crank ground, I always Dremel Grind a shallow cup across the journal to enlarge the oilway width slightly and  restore the wider oil film where oil enters the bearing surface.  New cranks had a teardrop or similar cutaway machined in production, but successive regrinds narrow the width of the teardrop cup, until it almost disappears, leaving a very sharp edge to cut a nice central groove in your new shells.  Grind the shallow cup first, before grinding the crank, have it ground if necessary, then finally polish the edge again to ensure a smooth transition from oilway to journal surface.
   
 I have already posted my thoughts on this in the thread about the drive side conrod oil bleed hole. It is to do with the reduction of surface area with depth of a shallow cone, like why your vintage Martini Glass seems to empty rather quickly.

 Top Quality Sludge, you make it look easy.

 Swarfy.

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #53 on: 15.03. 2019 07:28 »
G'day Simon.
I agree 110% with Swarfy.
By enlarging the hole it ends up wider (across the journal) than long (circumferential (thank god for spellcheck)). I double (3/16") it's width with a Dremell.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online Swarfcut

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #54 on: 15.03. 2019 08:45 »
G'day Musky. Proof indeed that telepathy exists.  Or that great minds truly think alike.  More a case of necessity is a Mother.

 Crack another Stubby.

 Swarfy.

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #55 on: 15.03. 2019 10:12 »
Thanks chaps, watch this space.

I've cleaned up the flywheel threads now, and I might put it on in the next few days. Any top tips?
cheers

Simes

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

Online Swarfcut

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #56 on: 15.03. 2019 10:29 »
Get all the planned machining, grinding etc done first. Put the crank in the freezer and wait.....either until you have free and secret access to  the domestic oven or it is barbecue time and either way you can warm that flywheel up nice and gently, til the spit dances, creep up on the cold crank and just drop it together.

 Swarfy.

Offline SimonHolyfield

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #57 on: 15.03. 2019 11:38 »
Get all the planned machining, grinding etc done first. Put the crank in the freezer and wait.....either until you have free and secret access to  the domestic oven or it is barbecue time and either way you can warm that flywheel up nice and gently, til the spit dances, creep up on the cold crank and just drop it together.

 Swarfy.

Got it, thanks.
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 #58 on: 15.03. 2019 12:17 »
I am going to the pub, *beer* deserve it after brain work on the yokes , stem etc for the featherybed- long story for another day. swarfy creep up on it sounds good but not like my mate who had his triumph crank case heated up and got the outer bearing race in at an angle and he couldn't centre it up-- it was a swine to get out again once everything was hot *eek*

Online JulianS

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Re: Pitting & Journals - Can I reuse this crankshaft?
« Reply #59 on: 15.03. 2019 13:44 »
I had the misfortune to have one of the radial flywheel bolts sheer off and completely wreck the crankcases.

In my opinion it is worth changing the existing bolts for new ones whilst you have it in bits..