Miscellaneous Torque Specs
02-07-16, 04:14 PM
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Miscellaneous Torque Specs
I've been wondering for awhile what the torque specs are for various items on our cars. I have a FSM, and I'm almost perplexed when it doesn't list torque specs for various items. A few things I can think of have been the thermostat cover and the drain plug for the coolant on the intermediate housing. Where are these? Are you just supposed to know what they are?
The back of the FSM has a section called "Unless otherwise specified", and lists torque specs for "6T" and "8T", I have no idea what either of those are, or how to distinguish between one and another. I'm very new to this, and I have searched, but perhaps this will help someone else. What does this mean?
The back of the FSM has a section called "Unless otherwise specified", and lists torque specs for "6T" and "8T", I have no idea what either of those are, or how to distinguish between one and another. I'm very new to this, and I have searched, but perhaps this will help someone else. What does this mean?
02-07-16, 04:51 PM
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i was going to say there is a page(s) in the back of the manual that lists torque specs, quite handy. the 6T and 8T refer to the thread size, 10mm socket and 12mm socket respectively.
Mazda is very nice, in that for the most part the fasteners are all torqued the same, they just use the thread size, which would have been the book value.
Mazda is very nice, in that for the most part the fasteners are all torqued the same, they just use the thread size, which would have been the book value.
02-07-16, 08:25 PM
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i was going to say there is a page(s) in the back of the manual that lists torque specs, quite handy. the 6T and 8T refer to the thread size, 10mm socket and 12mm socket respectively.
Mazda is very nice, in that for the most part the fasteners are all torqued the same, they just use the thread size, which would have been the book value.
Mazda is very nice, in that for the most part the fasteners are all torqued the same, they just use the thread size, which would have been the book value.
02-07-16, 09:27 PM
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you can measure, or the fasteners on the car are all JIS standard, which means that a 6x1.0 threaded bolt has a 10mm head, the 8x1.25 bolt has a 12mm head, 10mm threaded bolts (in 1.0, 1.25 and 1.5), are mostly 14mm head (the bolts that hold the engine together are 10x1.0 with a 17mm head, for example), and then the 12mm bolts are usually 17mm, although the lug bolts are 21mm.
02-07-16, 11:09 PM
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you can measure, or the fasteners on the car are all JIS standard, which means that a 6x1.0 threaded bolt has a 10mm head, the 8x1.25 bolt has a 12mm head, 10mm threaded bolts (in 1.0, 1.25 and 1.5), are mostly 14mm head (the bolts that hold the engine together are 10x1.0 with a 17mm head, for example), and then the 12mm bolts are usually 17mm, although the lug bolts are 21mm.
The '6' or '8' value specified in the FSM refers to the thread diameter on the bolt (measured in mm), whereas the second number you listed (i.e. 6x1.0) refers to the thread pitch (also measured in mm)? So given a bolt, I can measure it's diameter and head size and thus determine the proper torque specs?
02-15-16, 07:37 PM
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nope that is exactly correct, the thread size and pitch determine the torque value, and Mazda usually just goes out of the book, so just about any given size fastener is torqued the same.
with a threaded bolt the threads are expressed thus; 6mmx1.0, where the 6mm is the diameter of the thread, and the next number is the thread pitch (in english its threads per inch, not sure what metric uses, maybe cm?). if there is another number 8x1.25x30 it is the threaded length of the bolt. so that one is an 8mm thread in a 1.25 pitch, and its 30mm long.
for the head size, Mazda uses a JIS, Japanese industrial standard, part. so a 6mm bolt has a 10mm head. the 8mm bolt has a 12mm head, 10mm gets a 14mm head, and so forth. there are exceptions, things like the strut top nuts are 8x1.25 threads, with a 14mm head.
the european and american standards tend to be a 10 or 11mm for a 6mm bolt and a 13mm for the 8mm, which is why the hardware store stuff is sometimes different
with a threaded bolt the threads are expressed thus; 6mmx1.0, where the 6mm is the diameter of the thread, and the next number is the thread pitch (in english its threads per inch, not sure what metric uses, maybe cm?). if there is another number 8x1.25x30 it is the threaded length of the bolt. so that one is an 8mm thread in a 1.25 pitch, and its 30mm long.
for the head size, Mazda uses a JIS, Japanese industrial standard, part. so a 6mm bolt has a 10mm head. the 8mm bolt has a 12mm head, 10mm gets a 14mm head, and so forth. there are exceptions, things like the strut top nuts are 8x1.25 threads, with a 14mm head.
the european and american standards tend to be a 10 or 11mm for a 6mm bolt and a 13mm for the 8mm, which is why the hardware store stuff is sometimes different
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