777B's in for repairs...

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Nick Drew
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Re: 777B's in for repairs...

Post #11 by Nick Drew » Tue Apr 15, 2008 10:39 pm

Scary amounts of money Stuart !!! :o :o :cry:

Nick :mrgreen:


jevlar
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Re: 777B's in for repairs...

Post #12 by jevlar » Wed Apr 16, 2008 9:59 pm

Doesn't look to bad on the spindle, that groove can easily be repaired by a specialist shop like http://www.metalock.se/index.aspx?lang=EN-EN
Seen them do amazing jobs on large axles in the papermills around here.


But I have to wonder, didn't that amount of mechanical wear on the bearings and spinlde show up on the drain plug magnet or sos samples?
/Per Eriksson

Cat tech


davej
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Re: 777B's in for repairs...

Post #13 by davej » Wed Apr 16, 2008 10:30 pm

Found this on www.lorryspotting.com

http://www.lorryspotting.com/newsArticle.asp?nID=1123959027

Are these your "D" models coming up from southampton by any chance stuart??

Nice little queue behind em....

Dave
my mumblings and general witterings....http://normanshowse.blogspot.com/


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SRB
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Re: 777B's in for repairs...

Post #14 by SRB » Thu Apr 17, 2008 10:29 am

Hello Dave,

They certainly are our trucks, the plant numbers are a dead giveaway, only another 3 to come up now!

Hi Jevlar,

You have to be careful of how the spindle is repaired, we have metal sprayed them in the past only for them to peel off in big lumps, we have a couple of superb engineering companys who can repair them for us, but one of the main troubles is there has been several mods to how the bearing is mounted, first there was no dowel or ball, then a ball and slotted bearing was introduced, the ball would shear off so then an elongated hole and a dowel was introduced then they went away from pinning the bearing all together! So just trying to figure out what to do.
As for the oil sample, we bought these 3 truck used from Cyprus, so we have no real history on them.

The continuing saga of the engine.........

The engine is still coming apart, got it on the turn over stands and started to knock it apart again, removed the right hand bank of heads, found all new non-genuine gaskets underneath, looks as if its just been nailed back together, however, the locating dowels for the cylinder heads have been installed to far in, this means the heads wern't properly located which may explain all the water. The right hand cam shaft is also looking a bit sick, couple of the lobes are pitting up quite bad, looks like more expense.
The bores are water marked so looking like a set of liners to go, should be down completly today, fingers crossed that the bottom end is in some sort of order......
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SRB
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Re: 777B's in for repairs...

Post #15 by SRB » Thu Apr 17, 2008 1:32 pm

Well the engine is now stripped,

Looks to have had a single cylinder failure recently as there is a new piston and head on number 4 bore.
Crankshaft needs a re-grind as it is scored and water damaged.
Both camshafts will need to be replaced as well.
injectors to be tested, turbo's oil pumps and water pumps re-built and all the coolers to be changed out.
This engine didn't have any thermostats in ti, not sure if that is because of the high temperature they were working in or to cover up another fault!

SB
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martyn williams
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Re: 777B's in for repairs...

Post #16 by martyn williams » Fri Apr 18, 2008 4:55 pm

Looks like an expensive rebuild Stuart.I expect those trucks soon recoup there money though.
The V16 Ruston Paxman's I worked on in the early 1990's used to cost £200,000 to overhaul but would last 10 years till next rebuild.


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SRB
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Re: 777B's in for repairs...

Post #17 by SRB » Thu Apr 24, 2008 6:10 pm

Well work is sort of slowing down on the B's now, got the block away for skim and then it will need a counter bore, the crank is away for a polish and inspection (hopefully won't need to grind), heads are being stripped and cleaned, got the bill in.............. won't be gettting much change out of £55,000..... :o
On the upside, the engine will be good for the next 15,000 hours, in Scotland 777's normally do around 4500 hours per year so would be needing to go into her again in about 3 an half years, but she is destined for the blooming coalfields of England so will only be doing anout 2500 per year :thumbs_up:

Just purchased a complete wheel station as a spare unit, this is going straight on one of the B's whilst we rework the others.

Will keep updated as we start the re-build...

SB
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Mark Williams
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Re: 777B's in for repairs...

Post #18 by Mark Williams » Wed Jan 21, 2009 1:05 pm

Hello Stuart,
I have a bit of imformation regarding OHT wheel spindles for the future for you if it is of any help.
I used to work for Finning at Llantrisant,Cardiff,Tumbler Ridge and Toromont Cat here in Canada.
Most of my work has been around OHT, especially 777s and 785s.
I spent 99% of my time over-hauling front and rear wheel stations at Tormonts reman facility for the above trucks.
When we would get the wheel stations in for over-haul,all the major wearing parts would be magna-fluxed for cracks,the spindles would be measured and every time would be under spec.
We had our own metal spray facility,but had found in the past as you said that it would peel after a while.
I found while the crack testing was carried out on the rear spindle by an outside contractor on the premises,that the splines would have an air line crack lenth ways,90% of the time and an OR spindle was needed ,the fronts would be ok.
We had a hard chrome contractor in Quebec and sent a front and rear spindle as a trial,because of our experience with metal spraying,it was decided to have them hard-chromed to spec with NO + or - so the pre-load could be met on setting the bearings in the vertical position on assembly.
We run 15 Cat 785B and C trucks on this maintainance contract and all the spindles if they don't crack are hard-chromed.We get way over the given hours on this repair.
By the way Stuart,the cracks in the spindles as we both know are down to the obvious,OVER-LOADING.
But they don't listen.
I hope this imformation is of some help,
Regards from Canada,
Mark. :D


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SRB
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Re: 777B's in for repairs...

Post #19 by SRB » Wed Jan 21, 2009 1:35 pm

Cheers Mark,

"overload"? No, never, everyone knows the 777 is a 150 ton truck............... ;)

SB
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Ross
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Re: 777B's in for repairs...

Post #20 by Ross » Thu Jan 22, 2009 12:37 am

Nice Pic's mate :thumbs_up:

The last time I was inside a 3500 was a 3516HD. Changing a few head's ....... :thumbs_up: lovly job :thumbs_up:


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