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Will11

Member

• May 8, 2019

• #1

The dif on my series 2 has basically sheared off all the bolts holding the crown wheel on. I ordered some 3/8 BSF bolts from Dingocroft and the original bolts were black colour (High Tensile Steel?), the new bolts that I have look like a standard steel that is 3/8 BSF.

My question is does it really matter what type of bolts that I use inside the rear diff?

Also what torque would these bolts have to be to struggling to find it.

 

Last edited: May 8, 2019

steve2286w

Well-Known Member

• May 8, 2019

• #2

As they have sheared off go for strong ones
Crown Wheel bolts 40 to 45 ft/lbs from Green Bible

 

Blackburn

Well-Known Member

• May 8, 2019

• #3

What have the new ones got stamped on the heads should be 8.8 .

 

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Will11

Member

• May 8, 2019

• #4

The new bolts have 8.8 stamped into them.

 

Blackburn

Well-Known Member

• May 9, 2019

• #5

they are high tensile so will be fined.

 

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Webley1991

Well-Known Member

• May 10, 2019

• #6

Are the replacement bolts silver coloured? If so they are most likely zinc plated.

As far as I know, zinc plated bolts should not be used where they will be submerged in oil as this can cause the zinc to flake off.

Un-plated black bolts, known as "self coloured" should be used in these situations. For example, you should not use plated bolts inside an engine.

 

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suburban

Well-Known Member

• May 10, 2019

• #7

same thing happened to my s3 a few months back. I got replacement black bolts from Ashcroft transmissions.

haven't drilled out the remains of the old bolts yet though did get a used diff to get the truck back on the road quickly

 

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suburban

Well-Known Member

• May 10, 2019

• #8

crown wheel bolts

https://www.ashcroft-transmissions....fferential-rebuild-kits/crown-wheel-bolt.html

diff faq's

https://www.ashcroft-transmissions.co.uk/frequently-asked-questions/differential-faq-s.html

crown wheel bolt torque 60nm