MLU FORUM  

Go Back   MLU FORUM > MILITARY VEHICLES > The Restoration Forum

Notices

Reply
 
Thread Tools Display Modes
  #61  
Old 10-07-18, 09:57
Jonathan Moore's Avatar
Jonathan Moore Jonathan Moore is offline
Registered User
 
Join Date: Aug 2012
Location: mid wales britain
Posts: 505
Default

Nice pistons Mike, where did you get them from as I will be requiring some spares for my engine. Its going to need to be relined, new pistons but the bottom end, cam shaft etc are in incredibly good condition with very little wear, so in that respect I am lucky.

Jon
__________________
1950 Land Rover series 1
1967 Land Rover series 2A LWB
1986 Land Rover series 3 SWB
1938 DKW SB200
1944 DKW NZ350-1
1967 Ural K750 sidecar outfit
1944 VW Kubelwagen KDF82
1942 Steyr 1500A
1944 Morris C8A
1943 Chevrolet CMP8A HUP?
194? Bedford QL
Reply With Quote
  #62  
Old 10-07-18, 10:12
Mike Kelly's Avatar
Mike Kelly Mike Kelly is offline
Fan of Lord Nuffield
 
Join Date: Feb 2003
Location: Victoria Australia
Posts: 5,635
Default

Quote:
Originally Posted by Jonathan Moore View Post
Nice pistons Mike, where did you get them from as I will be requiring some spares for my engine. Its going to need to be relined, new pistons but the bottom end, cam shaft etc are in incredibly good condition with very little wear, so in that respect I am lucky.

Jon
Hi Jon

I think you need the 4 cyl. EH pistons, these are a larger bore than my 6 cyl OH engine. Apparently the 4 cyl. pistons are more easily found , you should have little problem sourcing the 4 cyl. pistons
__________________
1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad
Reply With Quote
  #63  
Old 10-07-18, 10:22
David Herbert David Herbert is offline
Registered User
 
Join Date: Mar 2010
Location: Ayrshire, Scotland - previously Suffolk
Posts: 548
Default

Mike,
If the rust on the 'new' rings will clean off with minimal pitting I would use them. individual pitts will make no difference but obviously any significant loss of metal is a no-no. A very fiddly job though as each will have to be done by hand a cm at a time.

David
Reply With Quote
  #64  
Old 11-07-18, 10:38
Mike Kelly's Avatar
Mike Kelly Mike Kelly is offline
Fan of Lord Nuffield
 
Join Date: Feb 2003
Location: Victoria Australia
Posts: 5,635
Default rings

Quote:
Originally Posted by David Herbert View Post
Mike,
If the rust on the 'new' rings will clean off with minimal pitting I would use them. individual pitts will make no difference but obviously any significant loss of metal is a no-no. A very fiddly job though as each will have to be done by hand a cm at a time.

David
I am probably being fussy, the pitting is not that bad but the oil scraper rings do look somewhat dirty and distressed. There is a piston ring business down in Melbourne ( Phoenix rings ), might give them a try and find out how much a new set of cast iron rings will be .
__________________
1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad
Reply With Quote
  #65  
Old 15-04-24, 01:51
Mike Kelly's Avatar
Mike Kelly Mike Kelly is offline
Fan of Lord Nuffield
 
Join Date: Feb 2003
Location: Victoria Australia
Posts: 5,635
Default Broken bolts

Getting back to the Morris engine .

One major problem is: the small M6 metric water jacket cover bolts have snapped off.

My repair plan is to make a drilling guide plate and drill out the broken bolts. I can tap the holes to the larger M8 . size. A Hudson car restorer had the same problem, he used a drill press but he suggested using a mag drill would be ok. The drilling needs to be highly accurate. I have 4 holes where the bolts came to use as a guide. The holes are 46mm centre to centre in the x axis. . Pics will explain.
Attached Thumbnails
20240412_123639-1.jpg   IMG_1215.jpg  
__________________
1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad

Last edited by Mike Kelly; 15-04-24 at 03:16.
Reply With Quote
  #66  
Old 16-04-24, 04:39
Mike Kelly's Avatar
Mike Kelly Mike Kelly is offline
Fan of Lord Nuffield
 
Join Date: Feb 2003
Location: Victoria Australia
Posts: 5,635
Default Big end bearings

The 1937 to 41 military CS8 truck engine had it's genesis in the family of pre-war Morris 25 engines, the Morris 'big six' sedan of 1937 to 39 utilized the 25hp 82mm bore engine, the basic block was used in both civilian and military vehicles with variations in the cylinder heads, pistons, manifolds , carby and water pump. They are similar to other pre-war engines: poured big end bearings as used in the CMP Chevrolet 216.

I found a 25 engine out of a civilian Morris truck, the crankshaft and bearings are good enough for my needs . I plan to make up a engine from the two engines I have stripped down. I have new valves , pistons and valve guides (made by me). Just need to find a good engine machinist ..

These engines have a few peculiarities i.e. there isn't a rear main crank seal in the normal sense, they used a large flange with a threaded o.d. that throws the oil back . The dynamotor is chain driven by the duplex timing chain. The crankshaft has no counterweights.The military carburetor is a special updraft Solex-dustproof. Fuel is gravity fed to the carb from the Autovac vacuum unit that is mounted on the dash panel.

Another oddity is: the Leyrub joints, these are rubber 'universal joints' on each end of the prop shaft.. These joints are still available new. .
__________________
1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad

Last edited by Mike Kelly; 16-04-24 at 12:06.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
So my employer wants me to restore this. Sean Dunnage The Softskin Forum 13 18-07-14 17:48
Two T16s to restore EricF The Carrier Forum 16 17-02-13 19:40
Wanted, WC51 or 52 to restore Eric Szalanda For Sale Or Wanted 1 01-06-10 18:41
Help wanted to restore C8A Hanno Spoelstra The Restoration Forum 1 20-09-09 11:48
Question about CMP to restore in Argentina Hanno Spoelstra The Restoration Forum 3 23-06-09 10:45


All times are GMT +2. The time now is 01:10.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright © Maple Leaf Up, 2003-2016