MLU FORUM  

Go Back   MLU FORUM > MILITARY VEHICLES > The Carrier Forum

Notices

Reply
 
Thread Tools Display Modes
  #31  
Old 10-11-18, 22:21
Glen Plumridge Glen Plumridge is offline
Registered User
 
Join Date: Oct 2018
Location: Maitland NSW Australia
Posts: 35
Default

Admin?

Any chance of changing the thread title to something like "SAR LP2A and MK1 rebuilds"
Reply With Quote
  #32  
Old 11-11-18, 04:49
Luke R Luke R is offline
Registered User
 
Join Date: May 2011
Location: Gippsland, Vic
Posts: 289
Default

[QUOTE Need lots of parts so if anyone has bits for sale in Australia please let me know. I will put a WTB ad in the correct forum with a list.[/QUOTE]

Where are you in Aus, Glen?
Reply With Quote
  #33  
Old 11-11-18, 07:57
Glen Plumridge Glen Plumridge is offline
Registered User
 
Join Date: Oct 2018
Location: Maitland NSW Australia
Posts: 35
Default

East coast new Newcastle.

Can travel to pick up if required.
Did 3600 Km this past week ferrying all the parts I bought from Lightning Ridge.
Reply With Quote
  #34  
Old 13-12-18, 02:46
Glen Plumridge Glen Plumridge is offline
Registered User
 
Join Date: Oct 2018
Location: Maitland NSW Australia
Posts: 35
Default

Slowly stripping LP2A hull number 4425 and gradually getting parts and supplies together.
Only have the diff assembly to remove from the hull before I can get it sand blasted and get paint on the internal section.

Most parts have come off fairly easy and look like they will free up with a little work and lubrication.

Used the, weld a nut to the stud method to remove sheared off bolts and that worked well for the most part. Some impact after the weld cooled also helped the more stubborn ones.
Only have one threaded lug that was not recoverable.

First engine ended up being only good for parts as one of the cylinders was too far gone to re bore and putting in a sleeve is a last resort, so back on the hunt for an engine to rebuild.
It was only cheap so I got a heap of spare internals from it anyway.
The gearbox has freed up OK so might have a win with that one.

Tried a few methods of unseizing some of the worst track sections.
Soaked in citric acid solution. not much changed
Heavy hammering and flexing. not much changed
Sat the track section on a low temp fire and then worked over it with hammer once cool. This got all of the seized links moving and allowed the pins to be punched out. Pins were heavily pitted.


Found a place with 7/16" 4140 round bar so there will be new track pins if the trend continues of finding poor condition ones in the tracks so far.

Were pins hardened to a known rockwell number?


Getting some paint organised so I can protect items once they are reconditioned.
Reply With Quote
  #35  
Old 13-12-18, 11:39
David Herbert David Herbert is offline
Registered User
 
Join Date: Mar 2010
Location: Ayrshire, Scotland - previously Suffolk
Posts: 547
Default

Quote:
Originally Posted by Glen Plumridge View Post
Sat the track section on a low temp fire and then worked over it with hammer once cool. This got all of the seized links moving and allowed the pins to be punched out.
Glen,
The trouble with doing this is that it is likely to make the material of the links very brittle. That does depend on what they are made of and I do not know the metallurgy of LP track but most tank/carrier track that I have worked with is fit for display only if it has been heated. If you break a track at speed you nave absolutely no control of what happens next.

A much better way is to submerge it in a bath of molasses for a few weeks. As this is a very slow process it will gradually eat the rust from inside the hinge joints in a way that a faster chemical process won't. It will do no harm at all and is cheap if smelly. A plastic 'wheelie' type garbage bin is ideal as a tank as you can get a reasonable length in and it has a lid to keep the smell in and vermin out. There are various threads about this on the forum.

David
Reply With Quote
  #36  
Old 13-12-18, 18:42
Lynn Eades Lynn Eades is offline
Bluebell
 
Join Date: May 2003
Location: Tauranga, New Zealand
Posts: 5,534
Default

David, does M.C.I., B.S.S.309 mean anything to you?
Is it Malleable Iron ? That is a spec for British track links from Feb.1944.
They tried all kinds of brews with Nickel etc in the early days, but settled on a std brew, I imagine the Australian link was made of a similar brew.
I can't locate any info on the pin, but recall it was heat treated?
__________________
Bluebell

Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
Reply With Quote
  #37  
Old 13-12-18, 21:36
Glen Plumridge Glen Plumridge is offline
Registered User
 
Join Date: Oct 2018
Location: Maitland NSW Australia
Posts: 35
Default

I think of it this way, if track links were pure cast iron, then they would be brittle in it's normal state either hot or cold.

"Malleable cast iron" means it has had heat treatment up over 900 C to change the grain structure.

In my opinion as a welder / metal worker, heating up to around 200 C would have minimal, if any affect on the grain structure. Especially if they are cooled gradually and not quenched.

If you were to get them glowing red hot and then dump them into a tub of water then yes, problem.

The temp of the fire was around the same as if you were cooking on a cast iron pan. That sort of temperature doesn't make the pure cast iron pans brittle so I don't think the effect on track links is as bad as might be thought.

Having said that, I do accept that there is potential for a problem to arise if the metallurgy is not what we expect and will try the chemical options for a bit of a longer period to loosen links in future.
Reply With Quote
  #38  
Old 14-12-18, 12:28
John Mackie John Mackie is offline
Registered User
 
Join Date: Apr 2009
Location: Australia
Posts: 121
Default Carrier parts.

Welcome to the forum and the world carriers. The restoration of my carrier was mostly complete 10 years ago. I may be able to help you with some sispension parts.My carrier was upside dopwn in my yard for 35 years. I assembled it in 12 months and had it at Corowa in 2007 .
__________________
John Mackie (Snr) VK2ZDM

Ford GPW- script
#3A Ford Trailer
M3A1 White Scout Car
-Under restoration-
1941 Ford Truck (Tex Morton)
F15A Blitz
Radio sets- #19, #122, #62, ART13, and Command
Reply With Quote
  #39  
Old 14-12-18, 20:45
Glen Plumridge Glen Plumridge is offline
Registered User
 
Join Date: Oct 2018
Location: Maitland NSW Australia
Posts: 35
Default

Thanks for the offer John.
I think I will be OK for the suspension parts at this stage.
I have a mate that has a spare set that he is going to help me out with, so hopefully the LP2 will be OK.

I am still looking for a british set of rear suspension units though for the pommy Mk1 if you know of any around. As well as a few other pieces for both hulls.

I've got a list of odds and ends that I am looking for in the for sale and wanted section if there's anything there you might have that's no longer needed.
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
Mystery ram rod BCA The Gun Park 9 21-07-16 02:38
Who like a Mystery? Tim Lovelock The Restoration Forum 19 14-05-13 23:50
Mystery Guy 4 x 4 David_Hayward (RIP) The Softskin Forum 0 30-11-06 18:32
ID Mystery help Tony Smith The Softskin Forum 12 13-10-05 17:35
Mystery Keith Webb The Armour Forum 11 15-08-05 00:16


All times are GMT +2. The time now is 14:33.


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