Trooper 3/9 RAAC Posted January 27, 2021 Share Posted January 27, 2021 Hi, can anyone help with the thread size & form of the coolant drain tap on the passenger side rear of the Bedford 28HP block. The drain cock thread looks tapered & measures around .390" nominal diameter & TPI lines up with 28TPI gauge? Doesn't seem to line up with anything standard on my thread charts. The block has been cleaned out but the thread in the block needs chasing out as the drain cock locks up after a few threads. My parts book doesn't give the thread detail of this item. advice appreciated cheers Pierre Quote Link to comment Share on other sites More sharing options...
wally dugan Posted January 27, 2021 Share Posted January 27, 2021 THE tread is 1/8th BSP 28 TPI and is a parallel thread Quote Link to comment Share on other sites More sharing options...
Trooper 3/9 RAAC Posted January 27, 2021 Author Share Posted January 27, 2021 Thanks Wally, I did look at that, but the taper on the drain cock diameter threw me a bit. thanks for the confirmation cheers Pierre Quote Link to comment Share on other sites More sharing options...
david1212 Posted January 31, 2021 Share Posted January 31, 2021 Is the drain cock you have correct / original or at some time has the wrong part with a taper thread been fitted ? Quote Link to comment Share on other sites More sharing options...
Trooper 3/9 RAAC Posted January 31, 2021 Author Share Posted January 31, 2021 david1212, It is the original tap. I've got it sorted now & in the block with some sealant. Maybe just worn on the end few threads. We'll see how it goes when up & running again, Thanks for your interest. cheers Pierre 1 Quote Link to comment Share on other sites More sharing options...
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