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RL411 water pump hub/shaft swap question

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When using a roadster water pump to repair one from an RL411, which one do you use? Most information I've found indicates that there is an earlier and a later water pump for the r16 roadsters.

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Also... Do either of the roadster water pump gaskets work? If so, early or late?

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ive never noticed that there were different ones. depends prolly if you have the 3 main bearing or 5 main bearing motor....

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The only differences I have noticed is that the Nissan late production pumps use 6 mm screws to attach the rear cover rather than 1/4 inch screws.  The bolt holes for the fan spinner are also changed from 1/4 inch to 6 mm, but you are going to reuse your RL411 spinner anyway so who cares. Also, [probably after market suppliers to Nissan] the latest water pumps use sheet metal impellers, not cast iron ones.

 

As to the gaskets being different I think you will find that this is the area of gasket coverage of the engine block to pump surface.  The water jacket opening in the block and the coresponding pump opening will mate up and work.  Early gaskets leave a big open area around the engine block opening but the gasket seals the periphery anyway.  In either case, I  recomend tracing the gasket you do use on a sheet of good paper and saving the tracing.  You might want a gasket later and you can use the tracing to cut a new gasket from sheet gasket material.

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Sorry to thread jack, but now I am nervous. I have this water pump coming on the slow boat from Singapore. It looks like the water pump off my E1 engine. Does anyone know if this is a bolt on item???

 

image_zps41bf5e8b.jpg

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I am pretty much a Datsun noob. But I had read That the E1 is similar to the J 13 besides the stroke of the motor. I guess I will know for sure when it arrives and I compare it. But visually, on thumbnail pictures, it looks identical. Learning the hard way sometimes...

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J-series is the replacement for the E12 engine. They are similar and some parts interchange.

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i would say use the one with the lil square in the bottom corner....

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I know this is an old thread so I apologize if it is inappropriate to reply, but there is a significant difference between the early and late 1600 Roadster water pumps. The late Roadsters had a fan clutch which pushed the fan further forward. To compensate, the mounting bracket on the shaft was pressed much farther back, if I recall correctly actually recessed back further than the end of the water pump housing itself. The bolt pattern for the fan was also different, as the 68-70 Roadster fan was a single plastic unit rather than two pressed metal pieces.

 

 

I never had an opportunity to try it for the 1600, but I bought some parts for my '66 PL411 (J engine) from a Nissan forklift parts department. The H20, commonly used in forklifts, is the same block as the R16. It is possible that the H20 forklift water pump may work on the RL411, and if so is probably dirt cheap - at least they were back in the early 2000's.

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the issue on the 411 isnt the aluminum part itsself, the hub is specific to the 411 and the h20 wouldnt have that hub on it most likely

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