Details of rear jacking point.

Can anyone who owns a Generation 4 Prius measure the diameter of the hole at the bottom of the rear jacking point shown in the photo? A friend in another part of the country has asked me to make a jacking adapter for her.

Thanks in advance.

 

Thank you very much.

 

It means that it will take an M8x1.25 rivet nut and bolt. An upside down piece of 1/4 inch aluminum diamond plate bolted to the rivet nut with a countersunk M8x1.25x20 hex socket bolt will provide a non slide locking grip on the rubber pad of a flat top racing jack.

The jack sliding off is the worse problem in using the car's jacking points. The point slides off the pad without letting the assembly compensate with the jack's wheels.

I did this with my Gen 3 2012 Prius v and made the rear jacked up car really stable. Before, I was afraid of the jacking point sliding off the jack.

 

We made up this kit, today. Thanks to Jerrymildred for providing the information.

 

The Gen 3 version works great.

 

If there is not enough friction between the top of the jack and the jacking point, the jacking point will slide off of the top before the movement of the jack on its wheels move to compensate for the change in the length of the base of the triangle made by the front wheels is shortened and the jack is raised..

It be basically two dynamic resistance parameters opposing each other. You want to ensure that the inertia of the jack's wheels give before the frictional resistance between the jacking point and the top of the jack is overcome.

 

Almost all low profile "racing jacks" have flat tops foe access to low car chassis. The teeth of the "U" shaped cut leaves marks on the underside of the chassis and bens over "knife edge" standing seam pinch welds.

 

They don't fit correctly. The one rests on the "knife edge" of the vertical weld seam. The correct support point is the inside behind the vertical seam. Just look at the head of the Gen 2 and Gen 3 scissors jack. The slot in example you show sits the round pinch weld if the Gen 4 on two "knife edges."

 

The top of the Gen 4 scissors jack looks like this.

 

We looked for years in an attempt to find a jacking adapter to fit the "knife edge" standing seam rails of the Gen 3 Prius, which is standard with many unibody Toyota vehicle. We have found none that were a perfect match. So, we made out own.

 

The hockey puck contacts the standing seam of the pinch weld's "knife edge" similar to an upside down tight rope walker.