How’s this for a crankshaft?
Posted: Fri May 21, 2021 7:25 pm
Doxford marine engine works, Sunderland - 1960
I think they're still looking for some NOS.Morris Minor Owners Club
Promoting the Preservation and Use of the Postwar Morris Minor
https://board.mmoc.org.uk/
How’s this for a crankshaft?
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Re: How’s this for a crankshaft?
Posted: Fri May 21, 2021 7:34 pm
How big are the big ends going to be for that? Surely they're going to need a box of giant ends? I think they're still looking for some NOS.
I think they're still looking for some NOS.Re: How’s this for a crankshaft?
Posted: Fri May 21, 2021 7:39 pm
And here is how a similar crankshaft is fitted without taking out the engine - marvellous 
https://www.youtube.com/watch?v=2drej_qeRSA
https://www.youtube.com/watch?v=2drej_qeRSA
Re: How’s this for a crankshaft?
Posted: Fri May 21, 2021 8:15 pm
Few more. Doxfords lasted until mid 80s. Building still stands.
I used to work up the Wear from there.
- Doxford Pipe/repair shop 82
- 7DCCA7B8-F883-4E8C-92D2-B08A406DFE78.jpeg (170.63 KiB) Viewed 3540 times
- Doxford Machine shop annex 60
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Re: How’s this for a crankshaft?
Posted: Fri May 21, 2021 10:25 pm
Interesting photos, thanks for posting. It wouldn't surprise me if those engines were still going strong, somewhere in the world.
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 1:15 am
Ian Smithskids on the forum has worked on crankshafts a lot larger he may put some photos on 
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 6:33 am
Brilliant photos , imagine having a drop off turning one of those cranks. ( drop off engineering term for mistake where you have to scrap the work peice)
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 9:13 am
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 11:44 am
One of my jobs until I retired was eddy current testing the internal threads of the conrods off similar sized marine engines during refurb. I never found one that was cracked.
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 3:18 pm
So - eddy's not only outside the ship but also inside the engine. 
Re: How’s this for a crankshaft?
Posted: Sat May 22, 2021 6:31 pm
I never thought of thatphilthehill wrote: ↑Sat May 22, 2021 3:18 pm So - eddy's not only outside the ship but also inside the engine.
Re: How’s this for a crankshaft?
Posted: Mon May 24, 2021 12:10 pm
And this is when you have to take the full engine outphilthehill wrote: ↑Fri May 21, 2021 7:39 pm And here is how a similar crankshaft is fitted without taking out the engine - marvellous
https://www.youtube.com/watch?v=2drej_qeRSA
- EC0A21A9-B396-450B-BB99-B84F1BD8FF94.jpeg (402.98 KiB) Viewed 3355 times
- B91305E9-4C6D-45E2-8FAD-232F4B3E5D3F.jpeg (398.19 KiB) Viewed 3355 times
- DAFBC554-B0E3-45D7-A35A-EF0DE7C36B87.jpeg (218.78 KiB) Viewed 3355 times
Re: How’s this for a crankshaft?
Posted: Thu Aug 05, 2021 12:03 am
Amazing. Can you imagine how they clocked the shaft with the dti.
They are using a 4 jaw chuck and a centre on the tail stock.
This looks good for the main bearings, but what kind of machine could machine the big end journals.
The offset is huge.
The face plate looks like it has the radius.
Whats going on with the tail stock?
Looking again, i don't think the 4 jaw is large enough.
It needs a larger diameter for the jaws to work.
It looks like the journal is very near to the diameter of the chuck.
They are using a 4 jaw chuck and a centre on the tail stock.
This looks good for the main bearings, but what kind of machine could machine the big end journals.
The offset is huge.
The face plate looks like it has the radius.
Whats going on with the tail stock?
Looking again, i don't think the 4 jaw is large enough.
It needs a larger diameter for the jaws to work.
It looks like the journal is very near to the diameter of the chuck.