Thread size inquiry

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Fairlady5150
Roadster Nut
Posts: 63
Joined: Sat Jun 22, 2019 10:44 am
Location: South Carolina
Model: 1500/1600
Year: High Windshield-68-70

Thread size inquiry

Post by Fairlady5150 »

Hello all. Wondering if anybody knows the thread size for the block drain valve on an early / 3-main 1600 block? Also looking for thread sizes to plug the coolant line inlet and outlet on the intake manifold.
1968 1600
1967.5 1600
1970 2000
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keith0alan
Roadsteraholic
Posts: 879
Joined: Wed Sep 22, 2004 10:07 am

Re: Thread size inquiry

Post by keith0alan »

I don't remember the exact sizes but they are BSPT and not common hardware store pipe threads. Check with your local hydraulic shop rather than plumbing store.
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Solex68
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Posts: 1970
Joined: Fri May 25, 2012 3:30 pm
Location: Laguna Hills, CA
Model: 2000
Year: High Windshield-68-70

Re: Thread size inquiry

Post by Solex68 »

1/8 X 28 BSPT
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
Laguna Hills, CA
68 2000 U20
Always willing to help another Datsun Roadster owner
Pending installs: SS brake lines, Stan Stealth Dizzy
david premo
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Joined: Wed Jan 24, 2007 8:23 am

Re: Thread size inquiry

Post by david premo »

I think it’s 1/4 BSPT actually. The 1/8 BSPT are the ones along the oil gallery at the front of the 1600 and 2000. BSPT not only has a different thread count, the shape of the thread is different as well. As it’s a 1500 I’m not 100% sure, it could even be 3/8 BSPT.
Dave
Fairlady5150
Roadster Nut
Posts: 63
Joined: Sat Jun 22, 2019 10:44 am
Location: South Carolina
Model: 1500/1600
Year: High Windshield-68-70

Re: Thread size inquiry

Post by Fairlady5150 »

Thanks all!
1968 1600
1967.5 1600
1970 2000