Hilux bolt from diff

[Renfen]

G'day all I've hit a dead end
I'm fitting a trd centre to my hilux diff.
I have needed to make a 4mm spacer to space the crown wheel over.
In doing this I need longer bolts to hold the crown wheel on
They are 11mm wide 1mm pitch and I need them to be 25 mm long. My local bolts place can not help me.

[madmont]

Have a look at flywheel bolts for Mitsubishi 4g92 motor

[Indelible]

doubt they would be 11mm diameter, would be 12 or 10

[Hurricane]

maybe landcruiser ones? id go look into it now but im sick and feeling shit

or what about somone like ARP?

dan.

[madmont]

doubt they would be 11mm diameter, would be 12 or 10

You may doubt it if you like but I know they are 11 and longer than what is needed

[Indelible]

wow 11mm thats weird and very uncommon size

[petergoudie]

Are you ABSOLUTELY sure they are 11mm as there are plenty of Japanese bits that seem to be made on old British or US machinery and are Imperial size. They might be 7/16 UNF which is 11.1mm. Check using a pitch gauge.

If they are 11mm, a number of Renaults used 11mm x 1mm pitch (I think the pitch is correct) on their crown wheels. My old R4 had them and I think the late R10, 12, 14 and possibly Fuego all used the same gboxes. One of the big French suppliers is in Melbourne I think it is called Eurospares. I think it has recently opened a place in Sydney as well.


The R4 started with 9mm bolts, then went to 10mm then 11mm until they couldn't fit a bigger thread size in the diff carrier. The problem was the bolts could not get the clamping force required and the crown wheel would slip on the diff carrier and eventually the teeth would break. My fix (which worked) was to loctite the crown wheel on and then spot weld the bolt heads to the crown wheel with low hydrogen rods.

[dnegative]

Doubt they are 11mm

Take the bolt into an engineering supply store and get them to see what it is.

[4th surf]

As I cannot be bothered rummaging thru my box of nuts and bolts to find one nor do I have the inclination to pull one out of a diff to confirm at time of writing (fun day at the office) but I do recall them being an oddball size and thread pitch. I tend to agree with what Peter has posted as they are either a 1mm thread pitch or UNF thread. I would also follow Dnegs advice in visiting and engineering shop.

Yet from professional and also personal experience both as a mechanic and from my younger days of "Toranadom" as an apprentice back in NZ some 25 years ago I fear you are opening not a big "tin of worms" but an entire shipping container of them. All our torries back in NZ were 4 cyl so when you got one the first mod was to fit either the obligatory 186,253 or 308 and as a 16yo if you were really lucky and had nice parents you got a 350 chev. Unfortunately I had to settle for a UC SL/E Sunbird as "Only hoons have Toranas" Well that was according to mum but luckily dad neglected to tell her they were the same car. Now back to the point in a round about way. These UCs had a salisbury diff and when fitting your larger engine the diff ratio needed to be changed. Given that the same axle was shared with VC-early VK Commodore and being NZ 6 cyl and V8 models were few and far between at the wreckers the cheapest way was to use the ring and pinion set from the old "Banjo diff". This mod required just the same things that you have done to fit your TRD centre. Bolts found and "Sweet" untill you drop your second skid and shear all the bolts off.

The crownwheel much like a ring gear on the flywheel is shrunk onto the centre, all the bolts do is provide a little more help in holding it on.

But I may have the answer. Up until MY89 all Hilux ran what is known as the "Thin crownwheel" after that all except for 4.88 ratio for some reason changed to a C&P set up with a "Fatter" crownwheel. Only 4.88 continued as "thin" and was usually found in Auto Surf/4runner (widebody only) and 2wd "Workmate" utes. To run the "Fatter" or even in your case "Spaced" crownwheel you are going to find that it fouls the diff nugget casting

[madmont]

Here is a picture of the bolt in question next to a 7/16 unf screw. As you can see the 20tpi unf thread is quite different to th 11x1mm thread

I have never seen a g series crownwheel which has been shrunk on
If you want to keep your vehicle all Toyota you might be able to use some bolts that hold the driveshafts together on 60 series Landcruisers
80 series rears are the same

[Renfen]

Wow thanks man just tried one works a treat great help!!

[Renfen]

Wow thanks man just tried one works a treat great help!!

[madmont]

Glad to hear it

[Renfen]

Just ordered 10 from Toyota for $26.00 instead of getting custom bolts made up for $200