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E46 M43 Engine Overheated
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<blockquote data-quote="jarance" data-source="post: 318067" data-attributes="member: 21"><p>If water jacket have hairline crack, then you have to do more than just an top overhaul.</p><p></p><p>As mentioned earlier, ask the mechanic to do an engine compression first. This is the cheapest</p><p>and fastest way of telling whether there is a leak. It involves removing the spark plug and</p><p>insert a pump at the spark plug port. The pump will pressurises one chamber and the pressure</p><p>gauge will show the maximum pressure it could substain. </p><p></p><p>hairline crack can be traced by using dye penetrant method. it involved spraying the engine block</p><p>with a cleaner first. Secondly, a red dye is sprayed on the engine block. Excessive red dye is cleaned</p><p>off from the block. Third, a developer is sprayed on the engine block. If there is a hairline crack,</p><p>the white developer will show a red mark or line near the crack. </p><p>Some people also use ultrasonic flaw detector to determine hairline crack similar to</p><p>aeroplane wings fault detection.</p><p></p><p>i have seen one workshop in JB who have welded aluminium block before for repairing</p><p>the hairline crack. The repair is tedious and chances is 50/50 chance of sucess. </p><p></p><p>if the engine block is warped, then most repair shop will skimmed a very thin layer off the block</p><p>and use a slightly thicker gasket to compensated for the trimming of the engine block.</p><p></p><p>Like a bypass surgery, the engine will never be the same if you do a top overhaul. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p></blockquote><p></p>
[QUOTE="jarance, post: 318067, member: 21"] If water jacket have hairline crack, then you have to do more than just an top overhaul. As mentioned earlier, ask the mechanic to do an engine compression first. This is the cheapest and fastest way of telling whether there is a leak. It involves removing the spark plug and insert a pump at the spark plug port. The pump will pressurises one chamber and the pressure gauge will show the maximum pressure it could substain. hairline crack can be traced by using dye penetrant method. it involved spraying the engine block with a cleaner first. Secondly, a red dye is sprayed on the engine block. Excessive red dye is cleaned off from the block. Third, a developer is sprayed on the engine block. If there is a hairline crack, the white developer will show a red mark or line near the crack. Some people also use ultrasonic flaw detector to determine hairline crack similar to aeroplane wings fault detection. i have seen one workshop in JB who have welded aluminium block before for repairing the hairline crack. The repair is tedious and chances is 50/50 chance of sucess. if the engine block is warped, then most repair shop will skimmed a very thin layer off the block and use a slightly thicker gasket to compensated for the trimming of the engine block. Like a bypass surgery, the engine will never be the same if you do a top overhaul. :eek: [/QUOTE]
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