TooTallMike Posted January 30, 2012 Author Share Posted January 30, 2012 I hope those are genuine UNF bolts you are using and not metric rubbish. I will be taking notes you know! Also found that you'd left the dust extractor (vacuum cleaner) for the blast cabinet, I'll come by and drop it off soon. All UNC thank you very much - and at great cost! I have established that Bonda Primer bites well into the BZP so there's no concern about using shiny bolts. - MG Quote Link to comment Share on other sites More sharing options...
TooTallMike Posted February 26, 2012 Author Share Posted February 26, 2012 Engine has been stripped of ancillaries for painting. New rear chassis crossmembers have been drilled and test-fitted. Donor GMC rear bumperettes being re-drilled for the Autocar chassis mounting holes. Question - does anyone know what material the bumperettes were made from? They drill really easily for the first 3/4 of their depth from the outside (as shown), and then the rotabroach just refuses to bite further. - MG Quote Link to comment Share on other sites More sharing options...
Grasshopper Posted February 27, 2012 Share Posted February 27, 2012 I think they may be made of Undrillium. Quote Link to comment Share on other sites More sharing options...
G506 Posted February 27, 2012 Share Posted February 27, 2012 Hi Mike, that rear chassis section is a work of art, loving it! :-D Quote Link to comment Share on other sites More sharing options...
Joris Posted February 27, 2012 Share Posted February 27, 2012 It's starting to look very good already!! Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted February 27, 2012 Share Posted February 27, 2012 In all probability those bumperettes are made of spring steel, tough as old boots to machine but up to a point will bounce back into shape after an inpact rather than deforming. Quote Link to comment Share on other sites More sharing options...
N.O.S. Posted February 27, 2012 Share Posted February 27, 2012 I'm sure Radiomike is correct. Sounds like a job for an armour plate drill bit with those very flat rake angles. Guess they do an armour plate rotabroach bit for something less than a good GMC is worth? Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted February 27, 2012 Share Posted February 27, 2012 It's been quench and tempered or something like that to get a spring effect. Spot heat it with a gas torch till it glows red, then it'll drill OK Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted June 27, 2012 Share Posted June 27, 2012 http://www.g503.com/forums/viewtopic.php?f=26&t=206594 In case it is of use to you. Gordon Quote Link to comment Share on other sites More sharing options...
TooTallMike Posted August 13, 2012 Author Share Posted August 13, 2012 http://www.g503.com/forums/viewtopic.php?f=26&t=206594 In case it is of use to you. Gordon Thanks Gordon, but as stated they must be for the earlier civilian-cabbed 4144-series. Cheers anyway - MG Quote Link to comment Share on other sites More sharing options...
TooTallMike Posted August 13, 2012 Author Share Posted August 13, 2012 Progress has been slow and erratic due to multiple other pressures but we have now had time to do a bit more. I won't bore you with photos of components being blasted, primed and undercoated but suffice to say there are very few parts now not on the 'ready-to-fit' shelf. The engine is now well on its way to completion with just the starter motor to refurbish and fit. The biggest achievement of recent times was extracting the chassis from its dry store out into the field where it is to be steam cleaned, shotblasted and painted. I towed it a fair way with the Dodge WC but when that ran out of turning circle I had to resort to lifting the front up with the bucket of the JCB and manoeuvering it that way. - MG Quote Link to comment Share on other sites More sharing options...
AndyFowler Posted August 13, 2012 Share Posted August 13, 2012 Now that looks like a very pleasant working enviroment Mike ! Good to hear you have managed to sort out some spare time ! The most precious commodity Quote Link to comment Share on other sites More sharing options...
42 chevy Posted November 12, 2015 Share Posted November 12, 2015 Mike; Any updates on the rebuild, only asking because an Autocar G510 followed me home towing a 10 ton trailer:-D John G Quote Link to comment Share on other sites More sharing options...
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