Morris C8 Crankshaft specs.

[Lynn Eades]

Mike, Terry, it appears we might be able to do it from here, without the risk or expense.
It seems the same book has already been copied to a disc which recently arrived in N.Z.

[Mike K]

Originally Posted by Lynn Eades

Mike, Terry, it appears we might be able to do it from here, without the risk or expense.
It seems the same book has already been copied to a disc which recently arrived in N.Z.

That is good news because the Post Office want $50 to post the manual to NZ

[T Creighton]

Mike.-Thanks for taking the trouble to go to the Post Office to get that news.
It probably would be a similar amount to send it back as well.
Lynn is working on finding more about the disc so lets wait and see.
Thanks again.
Terry

[Mike K]

Getting back to the crankshaft size. Most crankshaft journals should be a rounded off figure eg 2" or 3" or whatever . Using a simple micrometer , it is a easy job to work out the size of the journals ? Mike

[Richard Farrant]

Originally Posted by Mike Kelly

Getting back to the crankshaft size. Most crankshaft journals should be a rounded off figure eg 2" or 3" or whatever . Using a simple micrometer , it is a easy job to work out the size of the journals ? Mike

Hi Mike,
I rebuild a lot of vintage engines, and must say that crank journal size at Standard do not commonly appear as "rounded off" measurements. I have the 1945 Morris Commercial C8 workshop manual and no where in it can I see crankshaft dimensions, although it does list the two undersizes available.
I suggest anyone removing bearing shells to carefully check the numbering on the back of the shell to determine what undersize it may be (or even STD).

When measuring crank journals always check for ovality too, when determining if they are worn.

[Mike K]

Originally Posted by Richard Farrant

Hi Mike,
I rebuild a lot of vintage engines, and must say that crank journal size at Standard do not commonly appear as "rounded off" measurements. I have the 1945 Morris Commercial C8 workshop manual and no where in it can I see crankshaft dimensions, although it does list the two undersizes available.
I suggest anyone removing bearing shells to carefully check the numbering on the back of the shell to determine what undersize it may be (or even STD).

When measuring crank journals always check for ovality too, when determining if they are worn.

Yes I should have written 'to the nearest 1/16" or similar' ! The big end journal on my Indian Lister is 3" diam. I think my series 1 Land Rover has 2" big end journals but that's a guess?

[T Creighton]

Mike and Richard.
I have two crankshafts at the engine shop tagged red and yellow
Red measures 2.110" to 2.114" Yellow measures 2.112" to 123"
My book (probably the same as Richard's) says -015" and -030 shells are available.
Jeff the reconditioner thinks the two shafts have been ground but????
He needs to grind the best one down another 0.010"
I have a rusted block here that still had the crankshaft installed. It has a reconditioning brass tag that states Pistons +0.020" Big ends -0.015 Mains -0.015
The tag says B&W was the workshop and the date Feb 1945
We still don't know what the original size should be which was my original query.
Who is good with the math?
Terry

[T Creighton]

The shells on the rusted engine block have the following:
Rear: service C9175-G-25FL
Centre: service C25-G-5EL
Front: service C24-G-5FL
Does this mean anything to anyone? I assume the G indicates the repair size which according to the tag is -0.015.

Ian Cox (Cox and Turner UK) says the last 4 engines they have done the mains were white metaled and line bored to suit the freshly ground shaft due to the scarcity of repair size shells.

Terry

[Lynn Eades]

Terry, Jeff should be able to guess closely what the original size was,judging from the type and size of shells removed?
I have some details here in front of me for bi metal steel backed bearings:
Babbit on a steel back is usually 0.004"thick.
Copper/lead is overlaid ) 0.008" to 0.020" thick
Tin/ Aluminium is the same, 0.008 to 0.020" thick.
(I guess a known steel backing thickness is needed)
Tri metal bearings are usually the same as the last two with the addition of 0.001" of babbit
Do you have a source of shells?. I guess you ask them to give you a shell tunnel size (measure them) and if they sound right, have Jeff grind to suit after you have them in hand?