Type 4 fan...

There are two types of fan on the type 4.

This type (what I have)


And this type (bought from @Zed )


The bolts for the fan at the top are too short for the fan a the bottom.

Any ideas where to get the longer type of bolts?

 

They are nothing special, just hex head bolts. If you know the length you could get them anywhere.
If @77westy isn't along with the spec I could take one of mine out and measure it for you.
BTW your existing one is from an early 1700 in a car. Do you have the bullet shaped cap for it?

 

bullet shaped cap is missing...

 

If you measure the size/length/thread pitch, any fastener supplier should have them. Try Kay's Fasteners on eBay.

If you're buying, never refer to a "bolt" if it's actually a setscrew (threaded all the way up). You'll be thrown out of any fastener shop if you commit that Ultimate Sin.

 

This is the size I got for the bottom (correct) fan.


Sent from my iPhone using Tapatalk

 

Shame, I've always thought they look cool.
It's been proved that they don't work any better though. I think those tye often came with cars that had aircon driven by an extra pulley and the real reason for the shape is that. The bullet cap was for cars without aircon.

Those are setscrews (thread up to the head). I think they should be bolts with a plain shank and thread on the end... I think I'll have to take one out...

 

I replaced like for like, but that doesn’t mean the originals were correct….correct size tho.

 

I'll have to take one out now, I expect you're right.

 

My engine is a Vega recon, so who knows what they used.

 

Parts book says M8x45 hex bolt (N0102464) although mine are setscrews. They're nothing special anyway, but I wouldn't use stainless.
Apparently the early fan had M8x30 socket heads (021 119 127).

 

^this. Standard steel is fine.

 

This^ Ordinary 8.8 grade steel has a higher strength than A2 stainless.

 

Nobody has mentioned that if you split the pulley from the fan make sure that you put it back the same way as it does have a timing notch. Notch's not visible in the pictures. Usually highlighted in white.

 

I seem to remember it's not possible to reassemble it wrong, just off centre as there's some play. Could be wrong. I had mine bead blasted and the pully powder coated and managed to reassemble it the right way and don't remember referring to the engine position to do it.

 

Yes l believe you're right. My 127 came with out a notch so I had to make one using the previous fan that I had as a rough guide and then the timing scale to pin point 7.5⁰ btdc. I was pleased with the result as tick over is smooth, without hunting, thanks to the 123.