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Looking at the fitting instructions for the pump housing (12 vane) and the need to use different gaskets of different thicknesses. I assume that the dimension between the rotor and the bottom face of the pump housing is critical to the efficiency of the pump.
Mine is very badly pitted. Or at least I think it is but I have never seen a new one so I am not sure what is expected or acceptable.
I notice that replacements are very cheap which make me concerned about the quality. Mike (Project PFJ) where did you get your pump housing from and how is the quality.
Second question. What is the size of the heater hose fitting. I very much doubt I am going to get it out.
Just saw your queries. On the heater hose fitting, I got mine for $9 plus $5 shipping from Ohio, so it is not worth the effort to try and recycle the old one:
https://www.ebay.com/itm/273973719921?h ... Swx8pdXLQd
The correct 1/2" British Pipe Standard size is identified as "12 mm hose -to- 1/2 pipe" in the drop down menu. The 1/2" heater hose is close enough to 12 mm so there is no metric fitment issue for the hose end. 1/2" BSP is the crucial requirement. Probably not necessary to say, but use a good quality thread sealant to install the fitting into the pump cover (I used Hylomar Blue Universal Jointing Compound, leftovers from an old E-Type project).
I got my 12-vane pump cover for GBP 18.25 from the usual suspect in the UK:
https://rimmerbros.com/Item--i-PKC437
It looked cheaply made (even uglier than the photo on their website), but the functional part of it looked to be OK:
I now have the new water pump installation complete and have run the engine a good bit - all seems to be well (for now!). I will be posting fuller details on the PFJ thread in the next couple of days.
The fitting procedure for the new pump cover is a bit of a rigmarole. For me the biggest PITA was the measurement of the free gap between the pump cover and the block. I spent LOTS of time with feeler gauges to try and get a consistent gap measurement around the perimeter of the cover. Then it dawned on me that to this *precision* measurement, one adds anywhere between 0.0125" - 0.0250" (with no advice given on where one should aim for in this spread), so the overall accuracy required must be rather loose. I ended up using the single 0.030" gasket for the install. The new 12-vane pump seems to run quite happily.
Note that the shipping costs from the UK to the US can eat one alive, unless one is willing to wait for up to 50 transit days for the cheapest shipping service. My water pump parts order was part of a larger order for GBP 388 in parts so I felt that I could "amortize" the nose bleed GBP 55 shipping cost for air express over the whole order. I got my order from the UK in five days' time - can't even get a letter from SC to NC that fast.