Wanted: ZPJ V6 crankshaft centering bushing

[gtpdz]

Hello there,

I am trying to find a good pilot bushing that goes into the crankshaft on the flywheel side, on ZPJ and ZPJ4 cars with manual transmission. If anyone has a lead please let me know. Thank you.

PN 053551

Screenshot_20260616_113404_Chrome.jpg

As shown in the circle

mmexport1781881603548.jpg

[Dieselman]

This engine is the PRV6, so used in Peugeot 604, Renault 30, Volvo760 and Delorean DMC12.

It's possible they all may use the same size spigot bearing, so worth checking those suppliers.

Check local bearing suppliers to see if they can supply one, alternatively have a precision engineers machine one from Phosphor bronze. It needs to be an interference fit into the crank-shaft and a sliding fit for the input shaft.

An engine remanufacturing workshop may be able to supply one.

[Dieselman]

I've had a look and Peugoet, Renault and Volvo appear to use a ball bearing in this location, size 17*40*12mm. (0.669*1.575*0.472") if that is the correct size, to avoid Oem p# use Timken 203FF.
Alternatively look for the correct size bearing for your gearbox input shaft. You can buy a special bore, (5/8") 15.88*40*12mm, both known as 6203 bearing.

It won't readily wear out as it only revolves when the gearbox is in gear and the clutch depressed, at all other times the gearbox input shaft is revolving with the engine crankshaft. Another good reason to not ride the clutch, or keep it depressed for longer than necessary to pull away, or change gear.

[gtpdz]

Thanks Will,

I have done some further look into parts catalogue, looks like on ES9 engine which have the similar crank end design of PRV, they have gotten rid of this spigot bush/bearing entirely for the manual transmission. They use ML5T which has identical internal supported input shaft bearings design as ME5T. Plus this bush was also never presented on XU engines with ME gearbox.

I have got one of these 5/8" 6023 bearing, but the fit onto the input shaft is kinda loose, that I can rock the bearing a little which means there might be a chance of the shaft free spinning inside the bearing race creating heat and potential damage.

So I have decided that this bush is not necessary, fingers crossed that I was right, will see how it works when the car is finished.

[Dieselman]

The XU series of engines doesn't need a spigot bearing as the centre drilling is sized to match the gearbox input shaft.

Did you obtain the special size 6203 bearing, I would be inclined to install it. Next size down is 15mm.
The input shaft spins in the original spigot bearing and the Xu steel crank, so I don't think the risk is significant. I can't see the gearbox input shaft for the applications specified with a ball bearing to be an interference fit, as you would never be able to fit the gearbox.

[gtpdz]

Yes I got two of these special sized 15.875 bearings, for me I considered pilot bearing should be a slide fit but with no side to side rocking movement, however these bearings have about 0.2mm of clearance in total which give quite a bit of side rocking movement when test fitted.

My idea of omitting this bearing is mostly based on ES9 crank end design being similar to PRV. That for the auto with 4hp20 they use the same plastic bush as the XM II with PRV and 4hp18, and for the manual with ML5T they have no bushing or bearing.

[Dieselman]

I have no knowledge of the ML5 gearbox, but am aware some gearboxes don't have a spigot bearing at all, the input shaft doesn't interface with the crankshaft.
It will rely on the input shaft bearing being rigid enough to support the shaft.