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Thread ID: 65593	2006-01-23 21:39:00	car brake disks.....	drcspy (146)	PC World Chat

Post ID	Timestamp	Content	User
423713	2006-01-26 20:57:00	... and to Terry: your: "I still dont know why Joe finds measurements to 0.0001" so remarkable, that's every day normal engineering stuff, dont take my word for it, it is what is every article on rotor runout says." .............is all well and good, but those tolerances have no practical use in the world of disc brakes..... Well, that's what the disk brake specifications call up. I checked the rotor on the other front wheel last night and the runout was 0.0012", still within spec. but not as good as the other one. ~~~~~~~~~~~~~ Torque values for drain plugs, a bloody good idea, I wish the average mechanic would do that. Case 1. My brand new in 1990 Daihatsu van, in for first service. Gear box filler plug thread stripped, and returned in that condition. Found out because oil was running down casing onto floor. Returned vehicle for repair, clown taps the hole oversize in-situ, thread out of square, gear box full of swarf. Case 2. Drain plug on differential, same vehicle, overtightened, hexagon corners removed, socket just slips round, had to have a bar welded on to be able to undo the plug. Case 3. Oil sump drain plug on Honda City bought from friend, only ever garage serviced, corners of hexagon removed, had to buy a new plug the first time I changed the oil. There are other similar cases of damaging nuts, not doing work that should have been done. I usually secretly mark parts that are supposed to be checked before taking a vehicle in. I don't like grovelling under a vehicle these days! Any wonder I query the competance of average car mechanic?	Terry Porritt (14)
423714	2006-01-26 23:23:00	Well, that's what the disk brake specifications call up . I checked the rotor on the other front wheel last night and the runout was 0 . 0012", still within spec . but not as good as the other one . ~~~~~~~~~~~~~ Torque values for drain plugs, a bloody good idea, I wish the average mechanic would do that . Case 1 . My brand new in 1990 Daihatsu van, in for first service . Gear box filler plug thread stripped, and returned in that condition . Found out because oil was running down casing onto floor . Returned vehicle for repair, clown taps the hole oversize in-situ, thread out of square, gear box full of swarf . Case 2 . Drain plug on differential, same vehicle, overtightened, hexagon corners removed, socket just slips round, had to have a bar welded on to be able to undo the plug . Case 3 . Oil sump drain plug on Honda City bought from friend, only ever garage serviced, corners of hexagon removed, had to buy a new plug the first time I changed the oil . There are other similar cases of damaging nuts, not doing work that should have been done . I usually secretly mark parts that are supposed to be checked before taking a vehicle in . I don't like grovelling under a vehicle these days! Any wonder I query the competance of average car mechanic? I would doubt the mechanical capacity of a clown who strips or rounds off any bolt or fitting . It is a case of stupidity, lack of experience or wrong tools . I have never had an adjustable crescent wrench (example ( . contractorstools . com/crescent . html" target="_blank">www . contractorstools . com) ) in my tool box . . ever!!! These are one of the worst killers of the hex on a bolt head and prevent a good feel of a bolt stretching or the threads being ruined . I don't care if a so-called "mechanic" has a fine chrome set of them in all sizes . . . it's not professional . Suspicion on my side of the water indicates to me that there are a lot of shade-tree types who hang out a sign professing to be a mechanic, who in reality should have their fingers broken . Bolts do break, and threads fall off all the time . There is a lot of bad metulurgy and quality control on the manufacturer's side too . I especially dislike most Korean and English alloys . They are either too soft or too hard . Japanese alloys are pretty good, but the old German quality that was the world's best has fallen to new lows and I rate them down there with Londonderry fog as far as draw strength, torsional capacity and all around general machinability . Quite frankly, there's not too much wrong with Detroit Iron . Unless one is a decal-swap for a Kia or Daihatsu, there's some good quality there . It isn't a quirk that the most sought after vehicles are the 1960's and 1970's US products . They may be heavy by todays standards, and not as fuel efficient, but they win in a collision and they keep on going and going .	SurferJoe46 (51)
423715	2006-01-27 01:43:00	It isn't a quirk that the most sought after vehicles are the 1960's and 1970's US products. They may be heavy by todays standards, and not as fuel efficient, but they win in a collision and they keep on going and going. The tank may win in the collision Joe, but the passengers might not survive to join the celebration. I'd rather have crumple-zones and airbags to protect me. Having survived a head-on collision at highway speeds between a late 60's English Ford and a late 70's Japanese Toyota Corolla, I appreciate the value of crumple zones, engines and gearboxes that go under instead of into the cabin and steering columns that collapse and go up to the roof instead of aiming for your heart. I literally walked away (after I woke up), the other parties didn't. Guess which vehicle I was driving? Cheers Billy 8-{)	Billy T (70)
423716	2006-01-27 02:33:00	You were lucky, Terry . My trouble with a sump plug wasn't overtightening . They didn't use a spanner . Finger tight was good enough . Until it fell out . I noticed the little light in time . A brand new van was fine . Except for the wheel studs . The first puncture saw the provided box wrench opening up . All the wheel studs were stretched . The assemblers apparently think that the torque limiter on a pneumatic wrench is a speed control . Billy, which of the Ford or the Toyota had more runout in the brake disks?	Graham L (2)
423717	2006-01-27 07:15:00	Billy, which of the Ford or the Toyota had more runout in the brake disks? Hmmm . . . . . . . . . . Hard to say, no braking was involved by either party; I barely had time to say Oh sh . . and it was all over . I'm picking the Ford though, I think the brake discs ran out on the rest of the vehicle a millisecond or so after the impact . One front wheel ended up half-inside the passenger cabin . To be honest, I wasn't over over-enthused about being attached to the front of a Ford myself . Cheers Billy 8-{) :horrified	Billy T (70)
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