JohnH Posted May 6, 2015 Share Posted May 6, 2015 What is the threaded plug on the rear driver side of the L-series block just bottom right of the last welch plug on that side ? Quote Link to comment Share on other sites More sharing options...
cgsheen Posted May 6, 2015 Share Posted May 6, 2015 Coolant drain... Quote Link to comment Share on other sites More sharing options...
Tony D Posted May 11, 2015 Share Posted May 11, 2015 It's the water pickup for the heater in a Nissan Patrol... Quote Link to comment Share on other sites More sharing options...
JohnH Posted June 25, 2015 Author Share Posted June 25, 2015 Just a follow up. Its interesting that of the various FSM & Haynes I have for 70 - 83 that only the 79 FSM ever mentions it in an ambiguous way when draining the coolant. Anyways I used the drain plug to clear out most of the coolant in the block when I had the header & the triples off. I poured 4 liters of Evapo-Rust in the block & let it sit for a few days to clear out any internal rust. Quote Link to comment Share on other sites More sharing options...
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