BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Help! - Rear brake cylinder bolt size needed!
- GuardianAngel
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Having taken one of the drums off, to take the shoes off get the adjuster out to clean and service it, one of the solenoid rubber just falls off pretty much resulting in brake fluid everywhere. No problem, I have new ones I will fit those. OH NO YOU DON'T says Mr Jimny!
The brake line union nut was rusted on and rounded off with a sniff of the spanner, so I cut the line, fully prepared to rebuild the line. No problem, all I need to do is unbolt the cylinder . NO NO NO the J says again! These have rusted up and rounded off in no time.
Now I need to drill the heads off and find replacement bolts
So, I need to know the size and thread pitch of the rear bolts that hold the brake cylinders onto the back plate. Does anybody know? I will email the manufacturer anyway to ask, but just in case anybody here knows...
I want to cry very hard......
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- markyp2000
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Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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- GuardianAngel
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Its the bolts that hold the brake cylinder to the rear back plate they I need replacements for. They are smaller than 10mm across (thread diameter), probably about 5mm.
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suzuki part 01550-06123 BOLT (6mmX12mm)
gustavo
Gustavo LU2HC - Rio Cuarto (Argentina)
Jimny 1999 - 1.6 16V - SOHC
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- GuardianAngel
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Many thanks again! I don't suppose you know the thread pitch? I have Googled the part number but I cant find the information.
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- GuardianAngel
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www.suzuki-forums.com/suzuki-jimny-sierr...sami.html#post329011
...that has a link to a table that describes the pitches used for different bolts sizes, apparently used by Suzuki. Here is the link:
www.boltdepot.com/fastener-information/M...ic-Thread-Pitch.aspx
I could always go Titanium! www.pro-bolt.com/titanium-hex-head-m6-x-...mm.html#.URVgaR1ri5I
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If you have destroyed the heads you will have to grind new flats, or put a slot across them.
They may well be fine pitch.
Standard ISO pitch is 1.0 for a 6mm thread, the fine pitch is 0.75mm. The Japanese have always used pressure die-casting for alloys, with fine pitched bolts. (The alloy corrodes much quicker than the traditional British sand casting alloys, but the die-cast ones don't have dirty great holes in them)
Pop down your local fastener supplier and get a couple of each
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
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- GuardianAngel
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facade wrote: Pop the rubbers out and warm the alloy cylinder up with a blowlamp and they will come out easily.
If you have destroyed the heads you will have to grind new flats, or put a slot across them.
They may well be fine pitch.
Standard ISO pitch is 1.0 for a 6mm thread, the fine pitch is 0.75mm. The Japanese have always used pressure die-casting for alloys, with fine pitched bolts. (The alloy corrodes much quicker than the traditional British sand casting alloys, but the die-cast ones don't have dirty great holes in them)
Pop down your local fastener supplier and get a couple of each
The bolts are knackered but its raining so have abandoned for the day. Freezing and hacked off.
The old man is coming over in the week with a Dremel so should be able to get them out. There is not enough room to get a drill behind the plate and get it square onto the head to drill them out.
If all else fails then I will blow lamp them as suggested, thanks for the tip.
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www.machinemart.co.uk/shop/product/detai...-piece-bolt-grip-set
They are the tool you need for removing nuts or bolts that have rounded.
Then once you have got it out you can take it to compare to the ones in Halfords or to the fasteners to get replacements.
If they sheer however, you'll be buggered and will need new wheel cylinders -but they are not that expensive anyway. A motor factor may even stock the bolts if you have to get new cylinders. It's certainly not worth trying to drill the bolts out of cylinders for the cost of new cylinders.
Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
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- GuardianAngel
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kirkynut wrote: You need a set of these:
www.machinemart.co.uk/shop/product/detai...-piece-bolt-grip-set
They are the tool you need for removing nuts or bolts that have rounded.
Then once you have got it out you can take it to compare to the ones in Halfords or to the fasteners to get replacements.
If they sheer however, you'll be buggered and will need new wheel cylinders -but they are not that expensive anyway. A motor factor may even stock the bolts if you have to get new cylinders. It's certainly not worth trying to drill the bolts out of cylinders for the cost of new cylinders.
Kirkynut
Thanks. I've got new cylinders anyway as I am going the whole hog and rebuilding the rear brakes. No messing around now
I know the size now so I will order some decent grade stainless bolts.
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GuardianAngel wrote: I know the size now so I will order some decent grade stainless bolts.
They will seize rock solid into the alloy by the time that you have got the wheels back on.
Never use stainless into alloy without a good coat of an electrically isolating thread coating.
Cadmium plated or zinc passivate is more usual.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
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