Suggestions for restoring the cooling system

[Cary]

Hi Guys,

I've just started the process to install a complete new exhaust system from the headers to the tail pipe on my wife's 1967 1/2 1600.

After removing the old headers and the intake manifold, it became obvious that the cooling system needs to be cleaned and refurbished. I've ordered new (braided) upper and lower radiator hoses, and I have a new intake manifold water tube and shield. I purchased the stainless steel water pump and cylinder head nipples. I'll remove the radiator and have it flushed. I'll take a look at the thermostat and housing, too.

Any general suggestions will be appreciated. One specific item that I'm interested in is the water that flows through the intake manifold. Do I use a pressure washer to clean out the old gunk?

Finally, below is a photo of one of the heater fittings -- it has been soldered or braised over the years. Are there replacements for these, or similar ones without the "shut off" handle?

Thanks for your advice and suggestions! Cary

2024-12-Datsun Cooling-07.jpg

[CSP311]

Yes, looks like the pipe has been re-soldered back on. You maybe able to get another secondhand from some one. Nissan has blanking plugs for the end of the pipes, https://www.carpartsmanual.com/datsun/s ... manifold#2 number 38.

I am restoring my intake manifold and I removed the welch plugs on the underside of manifold, to aid cleaning. The plugs were a bit thin, so would have leaked some point later. Replaced with new Nissan ones.

[Cary]

Hi CSP311 -- thanks for the advice and reference! Cary

[CSP311]

Cary, I used 00933-1251A for the larger 2 & 00933-1161A for the small one. The underlined bit of the part number tells you what size the welch plug is.

[toadman]

I had this manifold listed about a year ago for $100. I’d let it go for $50. if you’re interested. I believe it’s from a 1600. The valve turns nicely without being too loose.