BRENDA1 Posted April 4, 2022 Report Share Posted April 4, 2022 Just been checking the car over before we go an a 11 day holiday and found that the brass tap is leaking (second tap I have had) so I would like to replace it with a blank and copper washer. Could someone tell me the thread size, it’s probably on the forum somewhere but I can’t find the link. Mike redrose group Quote Link to post Share on other sites
stuart Posted April 4, 2022 Report Share Posted April 4, 2022 Just had to do the same Mike so I know its 1/2" X20 UNF youll need a corresponding copper washer too. Stuart. Quote Link to post Share on other sites
Hamish Posted April 4, 2022 Report Share Posted April 4, 2022 Mike you can have the one out of my old engine. fitted with welseal worked for me- Quote Link to post Share on other sites
james christie Posted April 4, 2022 Report Share Posted April 4, 2022 Why can’t our suppliers and the manufacturers of these brass taps get their act together and offer us something that doesn’t leak. I too have recently substituted mine with a set screw. This leak problem has been known of, for years ! T’was the cause of my starter motor ending its life prematurely - see the thread on this subject elsewhere. I did take mine to bits and tried lapping it with some paste - apparently without success. james Quote Link to post Share on other sites
stuart Posted April 4, 2022 Report Share Posted April 4, 2022 2 minutes ago, james christie said: Why can’t our suppliers and the manufacturers of these brass taps get their act together and offer us something that doesn’t leak. I too have recently substituted mine with a set screw. This leak problem has been known of, for years ! T’was the cause of my starter motor ending its life prematurely - see the thread on this subject elsewhere. I did take mine to bits and tried lapping it with some paste - apparently without success. james Even originals werent that clever, I had to replace my original 4a one after a lot of years use. Stuart. Quote Link to post Share on other sites
ianc Posted April 4, 2022 Report Share Posted April 4, 2022 A quick fix is to taper a piece of hardwood and then ram it in the hole. When I had such a leak, Carl (at Revington) lapped the internals of the tap and made it coolant-tight. I'm certain it was not the first time that Carl had done this! Ian Cornish Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 5, 2022 Report Share Posted April 5, 2022 Moss USA know of this issue and offer a ‘fix’ https://mossmotors.com/media/instructions/434-240_460-020_470-240_INFO_web.pdf Recently I had to fit a block drain tap for someone. Just stripped it and lapped the two parts together (body and levered plug) using very fine lapping paste. Rinsed it all clean and Reassembled with touch of water pump grease to lubricate. Works and seals fine. Quote Link to post Share on other sites
brenda Posted April 5, 2022 Report Share Posted April 5, 2022 I can’t see the point of a tap in 12 years on the old engine never used it as a tap take the hole unit out of the block and you get a better flow of water, picking up a blank this afternoon. Mike Redrose group Quote Link to post Share on other sites
Motorsport Mickey Posted April 5, 2022 Report Share Posted April 5, 2022 Used to be a reasonable idea when owners used to run anti freeze only in winter and the block got a couple of flushing's a year whilst you did it, but most owners want fit and forget now. Mick Richards Quote Link to post Share on other sites
AGR 441 B Posted April 18, 2022 Report Share Posted April 18, 2022 Had same issue years ago with my 4A and I`m sure it was a tip from Stuart that the TR6 block plug was a perfect replacement, (same thread). Fitted one and used it ever since. John Quote Link to post Share on other sites
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