Looking over the pump system on the Datsun. The pulley of the factory diameter wont slip over the whole pump housing. So that is out of the question. Without ordering a pile of pumps to samples I don't know how I could design around other models.

The Idea of moving the pump outward and continuing to use the factory V belt or custom serpentine is the best solution. The less we have to buy is best.

I could machine a custom pulley that resides within the timing belt belt plane for the water pump, and I could just place the factory pump right in its factory position.

I am picking up what you're are putting down D.

Rather than put the pump on the accessory belt plane we incorporate it into the timing belt system.

By doing that we would only need the one idler. Not two. The water pump would act as the removed idler. The tension sprung idler would remain on the opposite side of the system.

Just we would have to find a pump that resides at the exact stand off distance

If that is the current layout then no need to move anything.

I I don’t want to go any thinner than 3.5mm on the water passage wall. Looks like there is enough material there to make a decent water passage and leave a sturdy wall too.

Gotta check my paypal but I might have a few coin rattling around to buy some idlers, and a belt. I think I already have the Mazda HTD crank pulley, and might need to machine a cam pulley.

I want to move that idler down and in more too. So I can leave more material for the flow passage.

This is very close to what I am doing on the back side of the timing plate instead of the block. O-ring seal and a water passage flowing in the typical direction, but the remote WP pushes through the hose bib. No mod needed for the engine block.

It wouldn't sit in its factory spot.

Oh that’s a fancy expensive pump.

I essentially would machine the non moving parts side and a factory pump can be employed.. With a spot on the front timing plate to bolt up.

A full billet pump would be cool, but talk about endeavors.

The factory pump would be a remote option, but feeds and pulls from all the same places. I will start playing with visuals soon.

I'm going to play around with the model and see if I can incorporate the factory pump back into this with a bolt on portion. Same stand off as the factory so the V belt can be used.

I don't have the finances to invest in complete kits for this. I am only working with what I have on hand within my garage. So I would need help from the community to complete a full system.

Could someone do the foot work, and make a white paper list of all items needed along with the part numbers if it hasn't been done already? Then we can get an actual cost estimate for a complete kit.


HTD Crank Pully part number.
Idler part number.
Tension Idler part number.