Toyspeed.org.nz Message Board

by **Adoom** » Mon May 16, 2011 4:36 pm

So I have had to replace some rocker shaft retaining bolts in the head of THE STARVIA!! with cap screws(allen bolts).
I damaged one of the originals when removing it and cannot easily find an exact replacement.
But to get the correct length shank(the unthreaded bit) on the bolt, I have had to get ones that are too long.
I need to shorten the bolts.

They are M8.

They are only tightened up to 22Nm.

The method I am thinking of using is to first wind a nut(or a Die if I have one) on before cutting it.

Suggestions for shortening said bolts....?

by **Malcolm** » Mon May 16, 2011 4:47 pm

Adoom wrote:
The method I am thinking of using is to first wind a nut(or a Die if I have one) on before cutting it.

Suggestions for shortening said bolts....?

That's a pretty safe way to go. Whenever I shorten a bolt I just cut it, use a bench grinder or linisher to square off the end and then give it a small chamfer to help lead in to the thread. Then just run the end under a wire wheel to clean the burrs out of the thread at the end

by **Quint** » Mon May 16, 2011 5:00 pm

Malcolm wrote: Whenever I shorten a bolt I just cut it, use a bench grinder or linisher to square off the end and then give it a small chamfer to help lead in to the thread. Then just run the end under a wire wheel to clean the burrs out of the thread at the end

Can be done with a hacksaw and a file if thats all you've got. Really easy and a good little trick to get under your belt.

by **Stott69** » Mon May 16, 2011 9:14 pm

why not extract the broken end?

by **eskimo** » Mon May 16, 2011 9:37 pm

Quint wrote:Can be done with a hacksaw and a file if thats all you've got. Really easy and a good little trick to get under your belt.

Have done this many a time with cap screws, works a treat

by **gt4dude** » Mon May 16, 2011 9:46 pm

On another note, Anyone sell pre-washered cap screws? Like standard car bolts where the washer stays on the bolt

by **MAGN1T** » Mon May 16, 2011 10:21 pm

gt4dude wrote:On another note, Anyone sell pre-washered cap screws? Like standard car bolts where the washer stays on the bolt

Pick a part.
They've got just about everything.

Steve

by **Adoom** » Mon May 16, 2011 11:41 pm

Stott69 wrote:why not extract the broken end?

You are confused.

The original bolts are 25mm long with about 10mm of shank.
The only cap screws I could get with 10mm shank are about 40mm long.
So I need to make the cap screws the same length as the original bolts.

by **Truenotch** » Tue May 17, 2011 2:03 am

Sounds like you have the right plan anyway. I usually wind a nut on, make a clean cut with angle grinder or hacksaw, clean up and wind the nut in/out a few times to clean the threads.

by **blindnz** » Tue May 17, 2011 8:45 am

The 4age 16v ones are a bitch, the ones that go through the rocker cover. its like a bolt with another thread that goes through to hold the rocker cover on.

These are not fun to snap

by **Adoom** » Tue May 17, 2011 10:17 am

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by **Bazda** » Tue May 17, 2011 5:04 pm

If its a bolt holding a rocker shaft id just to buy an original item from Nissan.

by **Adoom** » Tue May 17, 2011 5:55 pm

Bazda wrote:If its a bolt holding a rocker shaft id just to buy an original item from Nissan.

According to the nissan parts thingy software, that bolt is only from the CA16/18/20 SOHC engine(NOT the DET) and they stopped making it in 1986 I think. The engine was not exactly uber common. I had to get a bit of coolant hose for it and that was EX japan.

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Suggestions for shortening a high tensile cap screw

Suggestions for shortening a high tensile cap screw

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