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H190 LSD fitment


Jelmer C31

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I have a stock H190 in my 1983 Datsun Laurel C31. It has the 29 spline axles.

I bought a OEM Nissan CLSD for it but when I took the old diff centre out and compared it I found out that it has a different height at the crown wheel flange and bigger crown wheel bolts.

 

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The crownwheel does fit but it sits to low.

 

Any advice what to do?

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The differential is adjustable side to side for setting the gear lash. It may be within adjustment range but if not, a suitable shim between the ring gear and the body of the differential should work. 

 

Drill and tap the differential for the larger bolts.

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The differential is adjustable side to side for setting the gear lash. It may be within adjustment range but if not, a suitable shim between the ring gear and the body of the differential should work. 

 

Drill and tap the differential for the larger bolts.

The stock, open diff had no shims in it and is not adjustable like how a H233B is.

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The stock, open diff had no shims in it and is not adjustable like how a H233B is.

 

The H190 has the shims under the bearing, and typically they are very thin, so seeing them is almost impossible without pulling the bearing. Not like the R200, or my 8" Toyota that uses fairly thick shims on the outside of the bearing.

So Mike is right, you are not going to move the diff over 3-4mm.

 

There are 2 ways to come up with a ring gear shim.

I originally took an old open diff, stuck it in the lathe, and machined a shim from the original flange.

Now take a piece of ground flat stock, and machine, laser cut, or water jet cut a shim out of that.

McMaster-Carr has the ground flat stock, which I bought a piece in case any one wanted a spacer when someone bought an LSD from me.

Don't know if McMaster-Carr will ship out of the country. If not, anyone in the US can buy it, and ship to you.

 

Ring Gear Spacers info:
ID: 4.724" min - 120mm
OD: 6.965"
8) 12.5mm holes on 145mm BC
 
Thicknesses: 3mm, 4mm
McMaster-Carr p/ns for flat stock:
3mm - 1388K45
4mm - 1388K57
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Thanks guys!

 

About the 10mm bolts, is a ring gear easy to drill and tap? It looks to me it is very hard and won't let it drill and tap that easy.

 

You can't !

You can't even chase the threads with a good tap. Too Damn Hard !

When I used ARP bolts in my ring gear, the threads were about 2mm too shallow for them to screw into.

The holes were plenty deep, but a tap wouldn't cut that hard of steel.

The only way to use them was to grind a slight taper on the end of the bolts.

 

If your ring gear takes 10mm bolts, and your diff has 12mm holes, make some sleeves, to go into the holes.

That is what I did.

 

H190%20ring%20gear%20bolt%20spacers.jpg

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If you sit each in it's outer bearing race, on surface plate, or machined flat surface, and measured from that surface to the ring gear flange, then you would get the exact shim thickness you need.

Then you could have the spacer made to that difference, and never have to touch the shims under that bearing.

After all, that is the bearing that sets the gear mesh.

The shim on the other side just holds the tension.

 

The way you're measuring throws a whole lot of variables into the mix.

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As long as the shim is flat, it should be fine. There is some leeway with the side adjusters.

 

I would make extra sure that the shim is totally, perfectly the same thickness all the way around, otherwise it will cause runout of the ring gear (crown wheel) that in turn cause tight spots with the gear lash. If it's not within .003" or .004" runout, you will have problems. Ideally there would be zero runout.

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The hardest part about grinding that shim will be holding it while grinding. Maybe you could grind it before you cut it out.

 

Yes, I used to chuck the carriers in a lathe to true them up also. They are usually pretty close though, within .002" or .003".

 

Once you get it all assembled, check for runout on the back of the ring gear and also check the backlash in multiple places around the ring gear.

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The hardest part about grinding that shim will be holding it while grinding. Maybe you could grind it before you cut it out.

 

The bed of that machine is switchable magnatic so it just sticks to the surface.

 

Crown wheel = ring gear

Bonnet = hood

Spotted dick = ???

Stoffregen = Dust Rain (in Dutch B)  )

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