The Craftmans Shop > New from Old
Puma / Dorman 6LE / MacFarlane B46B / 110 kVA Generator Resurrection
awemawson:
So an early lunch then start pulling the alternator apart. I've changed many but never dismantled one before - how hard can it be :med:
Not too bad really - I hadn't realised I'd have to un-solder and remove the slip ring assembly, but using 'chuck wedges' pulled it off it's spline eventually. I'll put a bit of Loctite on it on re-assembly.
Bearings came out without too much drama - whole thing would have been very quick if I hadn't been distracted by an urgent call to fix a cattle crush as the Vet was waiting to do a TB test - no pressure :bugeye:
Bearings measure out at 20 x 52 x 15 mm and 15 x 35 x 11 mm both being double rubber sealed. £11.28 produced a pair for delivery later in the week which isn't too bad at all :thumbup:
Now I need to measure up some anti-vibration mounts that hold the oil pressure and charging gauges and the big electrics box as the originals have perished not surprisingly after 47 years !
hermetic:
So why was there no oil pressure showing on the guage Andrew? Faulty electric sender?
AdeV:
--- Quote from: awemawson on September 30, 2019, 09:40:55 AM ---...urgent call to fix a cattle crush...
--- End quote ---
I could ask my sister (who is a vet), or you, what a "cattle crush" is, but I prefer to imagine it's a crushed ice-based drink, either grass or beefburger flavoured, served in a black-and-white mug with a large stem of hay, a pair of Christmas cracker fake cow horns, and drunk through an udder......
:scratch:
In all seriousness, it sounds rather nasty, and I hope all concerned emerged unharmed.
awemawson:
--- Quote from: hermetic on September 30, 2019, 02:39:24 PM ---So why was there no oil pressure showing on the guage Andrew? Faulty electric sender?
--- End quote ---
Puzzled :scratch:
Oil pressure is showing in excess of 60 psi whenever the engine is running - there was no pressure showing at initial cranking but that's not really surprising.
Ordered some light blue hammer finish paint and some anti-vibration mounts today. Lets see if the weather lets me trot outside with it and attack it with the steam cleaner in the next day or two :scratch:
awemawson:
--- Quote from: AdeV on September 30, 2019, 03:39:21 PM ---
--- Quote from: awemawson on September 30, 2019, 09:40:55 AM ---...urgent call to fix a cattle crush...
--- End quote ---
I could ask my sister (who is a vet), or you, what a "cattle crush" is, but I prefer to imagine it's a crushed ice-based drink, either grass or beefburger flavoured, served in a black-and-white mug with a large stem of hay, a pair of Christmas cracker fake cow horns, and drunk through an udder......
:scratch:
In all seriousness, it sounds rather nasty, and I hope all concerned emerged unharmed.
--- End quote ---
A cattle crush is a sort of tight pen holding a cow (or bull) tightly so that various things can be done to it, such as administering various veterinary products, or for instance artificial insemination. In this case it was a TB test:
"The TB skin test is the common name for the Single Intradermal Comparative Cervical Tuberculin (SICCT) test. This skin test is regarded as the definitive indicator of infection by the bacterium that causes TB in cattle - Mycobacterium bovis. It is the required test in the EU and has proved to be a reliable tool worldwide. In Northern Ireland, all herds are tested annually, as a minimum requirement, but some are tested more frequently if they are considered at increased risk.
On Day 1 of the test, two sites are clipped on the neck of the animal. The skin thicknesses at both sites are measured and recorded. Two types of tuberculin, one made from killed Mycobacterium bovis and the other from killed Mycobacterium avium, are injected under the outer layer of the skin of the neck (i.e. into the dermis) at the ‘bovine site’ and the ‘avian site’ respectively. On Day 4 of the test, the skin reactions to the two types of tuberculin are measured and compared. When the bovine site reaction exceeds the avian site reaction by more than 4 mm, the animal is declared a reactor under standard interpretation. When the bovine site reaction measures 1-4 mm more than the avian site reaction, the animal is declared an inconclusive under standard interpretation."
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