Water Jacket Expansion relief

Author Message   gregoryan New member Username: gregoryan Post Number: 3 Registered: 09-2004 Posted on Tuesday, October 12, 2004 - 10:33 pm:        It seems as though one of the biggest killers of old marine engines is rust/ sediment expansion under their jackets. I dont know if this is old news, but, I have mechanically removed loads of shale like material from water jakets. [I got the idea from my friend at Nth Richmond [Australia] whom builds his own marine steam engines.] He said "Why don't you just drill down through the top to relieve it a bit?, and plug up the holes afterwards?" Pic Attachment; [Water Jacket Relief 1] Drilled four 10mm holes in an even stud pattern, then used an extended 6mm masonry bitt which can be easilly angled to drill out all the compressed expanding sediment. I found that an ordinary HSS bit would immediately dull as tho the sediment was rock! It was easy to recognise when the drill hit solid bottom and as the masonry bitt won�t drill iron, it seems verry safe! Another observation was that there is minimal sediment over the top of the combustion chamber. With the Blaxland cylinder it was helpful to remove the bottom welch plug for drill access but probably not essential. Some people will not like the idea of taper plugs in their head, but I don�t like the look of exploded jackets! If you were real fussy you could cut the plugs off flush and putty any trace!? Mabee some chemical methods work but it is hard to see and be sure of the results. Long live our irreplaceable ancient artifacts!!! holes to drill-out jackets water jacket relief 1 trimmedA.bmp (49.2 k)   peterogborne Senior Member Username: peterogborne Post Number: 210 Registered: 09-2002 Posted on Wednesday, October 13, 2004 - 05:47 am:        Certainly a new idea Greg . Getting out that scale /rust is a headache and i have spent many hours just chiseling it out . I suppose it is a matter of being lucky and getting a jacket that is not too far gone . In some cases i have cut a decent sized window in the side ,sometimes a couple . Patched them with an epoxy after

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