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Time for a rebuild on my old 7

Discuss dozers here

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Mrsmackpaul
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Time for a rebuild on my old 7

Post #1 by Mrsmackpaul » Wed Feb 11, 2015 1:39 pm

Well I guess I have been here for some time and never really put much up so I better share something I have gotta do some work on my old D7 3T
its got a Letourneau blade double drum PCU Im taking that off and making it into a hydraulic A&T blade
a few years ago it ran a bit low on water and well when I poured water in I cracked a head so due to other stuff going on in life I have only got around to it now
anyway have been collecting parts for it for a few years now and I will need it for a big job (or at least a big job for me in june july & august so time to get cracking
I only learnt about these pre-combustion chamber in recent times and told that that was the most likely thing so I thought whip them out an with any luck all my problems will be solved yeah right

so some eager person in the past had taken to the big buts that hold the injectors in with a cold chisel I had a huge drama getting the injectors out one of them had almost no nut left so I cut it out with the gas axe a bit rough I know another came out still stuck in the pre-combustion chamber so I finally got these parts out they all looked good to me except the crook cut in half injector
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0240_zpsavpm5tu2.jpg
the took some swinging off a bar to get them to move
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0237_zpsh8eze4tu.jpg
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0226_zpsbtrsp20l.jpg
so I thought I better rip the head off before I attack it with the gas axe thes pre combustion chambers looked fine to my untrained eye so out with wire brush and look what I found
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0249_zpsnot3y4ut.jpg
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0262_zps48hadkns.jpg

so I found real bad rust scale in the water manifold and two thermostats were missing parts so my theory is the cracked head was blowing back thru the head and loosened all the rust
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0225_zpstxc0ffcc.jpg
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0223_zpsnhvvyuwy.jpg
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0221_zpstnr0gt2o.jpg
not sure what this pipe does but not much at the moment
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0217_zpsw7sgipzm.jpg
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URL of the original image: http://i1370.photobucket.com/albums/ag265/MrsMackPaul/IMG_0216_zpsgzyuaigp.jpg
so I decided to pull the other head and check it out its spotless so I feel my theory is fairly sound about all the rust scale
I have found a welding place in Townsville who feel they can weld up the head up ok they have been recomended from a few places
so I will run thead up tomorrow and see what they say

Paul
Your better to die trying than live on your knees begging


Jeremy Rowland
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Re: Time for a rebuild on my old 7

Post #2 by Jeremy Rowland » Wed Feb 11, 2015 2:54 pm

Good luck with that it certainly looks like you have your work cut for you.

Jeremy


Topic author
Mrsmackpaul
Posts: 926
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Re: Time for a rebuild on my old 7

Post #3 by Mrsmackpaul » Mon Jul 17, 2017 11:50 am

Well after getting side tracked with farming and life in general I finally sourced a fresh head and some other bits and bobs

Anyway I make videos now and then of some of stupid projects I have going on on the farm some like em so I started making one of the old 7 repairs a few weeks ago
Here it is so far

https://www.youtube.com/watch?v=ims2nOFuFKI

Paul
Your better to die trying than live on your knees begging


Jeremy Rowland
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Re: Time for a rebuild on my old 7

Post #4 by Jeremy Rowland » Mon Jul 17, 2017 1:52 pm

Nice one Paul :claphands:

Jeremy


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