Measuring the CV spacing.

The near side CV joint.

Today Damien Maguire asked if I could measure the distance between the two gearbox output CV flanges.
So the first thing was to get the car up on stands. Not easy as the ground is uneven and the car is too low for the jack to get under the front cross member. So it was a little game of lifting each side a bit at a time until I could get axle stands underneath. Not a safe process until it was up there so I forgot to take photos.

The edge of a car tyre on some cobbles. There is loose soil and weeds growing in the gaps between the stones.
These are all loose and wobbly!

With the engine under tray removed I could see where the CV joints were and how I would need to measure the spacing.

The near side CV joint.
Nearside CV joint.
Off side CV joint.
Off side CV joint

So I popped into the workshop and found some scrap sticks from the bin and a couple of small G cramps.
That allowed me to make a sorta caliper I could use to touch on the CV flanges for a measurement.

Two pointed sticks with small G cramps attached to a longer stick to make an adjustable caliper.
Well, it’s one way to measure a thing!

Crawling back under the car I was able to adjust the pointers on the caliper so that it touched off on the edge of the output drive flange.
The drive flanges are cups with a raised location rim but that was the best I could get.

An oily CV joint on the near side of the car with a wooden caliper pointer touching the gearbox output flange edge.
Measuring from this end…
An oily CV joint on the off side of the car with a wooden caliper pointer touching the gearbox output flange edge.
…to here.

So measuring between the points gave me 248mm. That might be something like 245mm from face to face but that can’t be confirmed until the gearbox is removed. Hopefully it will be accurate enough for what Damien needs.

A tape measure with one wooden caliper pointer at the 248mm mark.
248mm, I hope.

So to finish I measured the diameter of the CV joint. It should be either 90mm or 100mm so the easy thing was to set the bow calipers to 100mm and reach into the engine bay to see. And it is 100mm.

A hand holding the end of a bow caliper deep in the engine compartment to measure the diameter of the CV joint
Can just about reach from above!

 

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