Hi, does any one know why a Triumph Stag has a R/H & L/H cylinder block drain plug.TIA
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It is a legacy from the two Dolomite engines welded together.
To drain the coolant properly and give the passages a good clean out. Should be drained and flushed every two years when the coolant is changed.
Early engines had drain taps fitted, but as these frequently became blocked, it is easier to remove them completely.
3165A245-B3E9-4266-8B17-90E1FC3C696C.jpeg DBA65B3E-8CC2-4811-823C-EBBD8CE633F3.jpegDave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989. -
Yes agree with you ,but why are there two cylinder drain plugs.Comment
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Leslie.
How else could you drain both sides of the block? The only coolant connection between them is at the top by the water pump.
Mike.Comment
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So are you saying that it is not a common flow around the rear of the block, ie when the heater is set to hot you then have a common flow between both cylinder heads via the heater matrix.Comment
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Heater matrix is fed from the top of the engine (water pump/LH cylinder head) not the block.Originally posted by leslie chappell View Post
This schematic may help (courtesy of Grampian Stags): http://www.grampianstags.net/Stag%20...stag-water.JPGLast edited by DJT; 19 July 2022, 17:26.Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.Comment
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Interesting discussion on why the drain plugs are there on the block and not up on the cylinder head area. I think the question I would have asked is why there are drain plugs and you don't simply disconnect the bottom hose.The answer isn't 42, it's 1/137Comment
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Looking at the schematic, that would only drain from the water pump. If that is higher than the lowest points in the blocks then they won't drain (unless you disconnect the top hose first and rely on syphoning . . . maybe).Originally posted by dasadrewComment
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Sorry for the confusion - I don't need any explanation myself. I just follow the ROM. I was merely puzzled by the occupation with cylinder heads and heater in terms of draining the coolant.The answer isn't 42, it's 1/137Comment
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Removing the bottom hose will drain the radiator, and the engine down to the level of the top if the water pump. There will be no syphoning action to lower the coolant level any further.
Removing the temperature sender at the back of the l/h head will lower the level in both heads but not drain them. This is useful if you are removing the inlet manifold. Otherwise the only way you can drain each bank of the cylinder block is by removing both plugs.
Mike.Comment
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Thanks, so say if you had an engine block on the floor with both heads removed ,& you filled only one bank the coolant would not enter the other bank until the coolant got up to water pump level. so my question is what is stopping the coolant filling the other bank .Originally posted by DJT View PostComment
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To remove casting sandComment
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Can anyone tell me - just out of interest - what rabbit hole we're going down with this thread?The answer isn't 42, it's 1/137Comment
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I'm not sure what the weather is like in Germany, but here in the UK it is unseasonably hot. We are all looking for something to do in the cool of the house, and nattering on this forum serves that purpose. It also gives a chance to expand what we do (or do not) know about various topics.Comment
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It's 35°C in the shade in our little valley with a babbling brook, a bit hotter in the town. Had to limit the earthwork shovelling in the garden today to half a tonne. Just had a nice 5km walk to the DIY store and back. I guess it's down to what you're used to. Spent the latter part of working life commuting between Aix-en-Provence and Athens so a hot summer is quite nice.
Whilst the natterring is going on, when stowing the soft top should the front bar handles point outwards or inwards?The answer isn't 42, it's 1/137Comment
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