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Testing cranks and rods #718041
12/07/17 4:40 pm
12/07/17 4:40 pm
Joined: Dec 2017
Posts: 209
England
F
ferretjuggler Offline OP
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ferretjuggler  Offline OP
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F

Joined: Dec 2017
Posts: 209
England
I've got an A65 OIL project coming along at present.
The bike is a basket case (bits from several bikes actually)
The original crank and the DS rod were trashed beyond repair, but I've now got a used crank that has two grinds left, and a nice looking pair of used rods.
But I know absolutely nothing of the history of these components except what their visual appearance tells me.
I've heard of people getting cranks X-rayed or magnafluxed to check for hidden cracks or defects, but I'm not really sure how far to go.
I'm not planning on going racing on this bike, but on the other hand I do believe in using them for what they were made for.

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Re: Testing cranks and rods [Re: ferretjuggler] #718049
12/07/17 5:37 pm
12/07/17 5:37 pm
Joined: Apr 2015
Posts: 114
Wolverhampton, U.K
S
Simon Ratcliff Offline
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Simon Ratcliff  Offline
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S

Joined: Apr 2015
Posts: 114
Wolverhampton, U.K
I got my 150,000 mile crank (Norton Commando) checked 3 years ago using the magnaflux type method. Cost was flat rate of £50. No problems with mine but they showed me a ground stanchion which looked perfect until tested. The crack showed up no mistake.

So if you have any doubts I think it's money well spent. Never had any aluminium components x-rayed though. Have A65's got a habit of breaking rods?


Norton Mk3 Commando.
Re: Testing cranks and rods [Re: ferretjuggler] #718079
12/07/17 8:47 pm
12/07/17 8:47 pm
Joined: Mar 2006
Posts: 1,363
Magnolia, TX
htown Offline
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htown  Offline
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Joined: Mar 2006
Posts: 1,363
Magnolia, TX
Problem with A65 rods with alloy cap is the big end wears oval. Bolt the cap back on and carefully measure vertical and horizontal diameter.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
Re: Testing cranks and rods [Re: ferretjuggler] #718080
12/07/17 8:53 pm
12/07/17 8:53 pm
Joined: Aug 2015
Posts: 1,268
Bolton Lancs UK
A
Andy Higham Offline
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Andy Higham  Offline
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Joined: Aug 2015
Posts: 1,268
Bolton Lancs UK
I would not entertain used rods. A pair of new rods is cheaper than a leg out of bed


BSA B31 500cc "Stargazer"
Greeves 200cc "Blue Meanie"
Greeves 350
Greeves 360 Challenger
Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
'35 OK Supreme
'36 OK Supreme
Re: Testing cranks and rods [Re: Andy Higham] #718098
12/07/17 11:40 pm
12/07/17 11:40 pm
Joined: May 2013
Posts: 5,011
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,011
Rotherham - S. Yorkshire
Originally Posted by Andy Higham
I would not entertain used rods. A pair of new rods is cheaper than a leg out of bed


Plus 1!

I buy new aluminium rods from thunder engineering for my bikes, cost about £360-380 for a matched pair and excellent quality! The weight is the same as the 1970 on type rods so it could match your crank balance too.

I also had my crank nitrited following an oil starvation issue, polished the bad journal and it for treatment. Replaced the rod on that side too. Thunder matched the rod from their date code so the weight was uneffected.

I did polish a set of rods which were going into a friends engine, as they didn’t want to fit new units.


beerchug
Re: Testing cranks and rods [Re: ferretjuggler] #718184
12/08/17 11:56 pm
12/08/17 11:56 pm
Joined: Dec 2017
Posts: 209
England
F
ferretjuggler Offline OP
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ferretjuggler  Offline OP
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F

Joined: Dec 2017
Posts: 209
England
Thanks for all the good advice.
It looks like I'll have to add a new pair of rods to my Christmas list.
I've found some steel capped ones made by L F Harris Ltd.
Looking at them they are T140 rods with narrower big ends.
Not sure about the effect on the balance factor
though.

Last edited by ferretjuggler; 12/09/17 12:01 am. Reason: Correction of predictive text
Re: Testing cranks and rods [Re: ferretjuggler] #718240
12/09/17 3:51 pm
12/09/17 3:51 pm
Joined: Aug 2001
Posts: 4,121
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Joined: Aug 2001
Posts: 4,121
argyll. scotland, uk
I used T140 rods in one build, SRM bored them to suit the A65 big end size.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod

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