regginald Posted January 16, 2019 Report Share Posted January 16, 2019 Hi i have a leaking freeze plug on the bmc 1.8. it is behind the plate on the flywheel end and i do not know how to get it out to replace it has anybody had experience with this issue? it is a welch plug type. thanks Link to comment Share on other sites More sharing options...
Tony Brooks Posted January 16, 2019 Report Share Posted January 16, 2019 I suspect it may well turn out to be gearbox, bell housing flywheel & engine back plate off so you get decent access. Just may be yoy could flatten a domed core plug enough with a punch at an angle but I doubt you could drive a welch plug in that way. Link to comment Share on other sites More sharing options...
regginald Posted January 16, 2019 Author Report Share Posted January 16, 2019 thats what i suspected. I have noticed my engine block appears different to all the pictures i have found of the bmc 1.8. most seem to have one core plug like the mgb but mine appears to have 2 smaller ones next to each other. do you know why this is? Link to comment Share on other sites More sharing options...
Tony Brooks Posted January 16, 2019 Report Share Posted January 16, 2019 9 minutes ago, regginald said: thats what i suspected. I have noticed my engine block appears different to all the pictures i have found of the bmc 1.8. most seem to have one core plug like the mgb but mine appears to have 2 smaller ones next to each other. do you know why this is? No, apart from the country the block was sourced from so may be done because of local supply or manufacturing techniques. Link to comment Share on other sites More sharing options...
Boater Sam Posted January 17, 2019 Report Share Posted January 17, 2019 (edited) You could cut the rear plate corner off but its thick stuff. If its rusted through putting a convex core plug inside it stands little chance of working but there may be enough recess left outside the existing welch plug to get a convex to seal. In the bad old days we used to make lead core plugs and tap them in with goo, with low rad cap pressures they work. There are two 1.8D blocks, early have no ribs on the LH side where the "1800" is cast, later thicker blocks have ribs. Edited January 17, 2019 by Boater Sam added more Link to comment Share on other sites More sharing options...
regginald Posted January 18, 2019 Author Report Share Posted January 18, 2019 thanks, i used a hole cutter and cut out a circle from the plate and changed the plug, was incredible easy!! The hole cutter was superb and about a fiver on ebay. 1 Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 18, 2019 Report Share Posted January 18, 2019 1 hour ago, regginald said: thanks, i used a hole cutter and cut out a circle from the plate and changed the plug, was incredible easy!! The hole cutter was superb and about a fiver on ebay. Did that in an A55 to get to the core plug at the back of the engine Link to comment Share on other sites More sharing options...
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