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Engine Compression Test and Leak Down Test
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<blockquote data-quote="airtube" data-source="post: 736331" data-attributes="member: 11123"><p>For a start now, I can share my compression test readings and procedure on how i did it. Very easy.</p><p></p><p>1. Open engine cover.</p><p>2. Remove all Ignition coil.</p><p>3. Remove all spark plug.</p><p>4. Check spark plug for trace of engine oil. If there is engine oil on plug thread, high possibility valve cover gasket need replacement - that procedure I will share in another post.</p><p>5. Remove Fuel fuse under glovebox (No 31 for E39 cars).</p><p>6. Insert and tighten the compression meter into cylinder 1.</p><p>7. Press accelerator/throttle full.</p><p>8. Turn key to start engine and allow 5 time engine cranking.</p><p>9. Note down readings.</p><p>10. Repeat (6) to (9) for all other cylinders.</p><p></p><p>Warning: do not conduct this act alone as a bad compression reading can cause depression to the car owner and nobody will be around to cheer him up....</p><p></p><p>My M54B30: 190psi, 185psi, 185psi, 185psi, 185psi, 185psi</p><p>M54B22: 210psi, 220psi, 195psi, 205psi, 225psi, 205psi</p><p>M54B25: 188psi, 186psi, 170psi, 180psi, 175psi, 195psi</p><p></p><p>Remember that in western and developed countries, it is a norm to conduct a compression test regularly and of course before a purchase of a car or engine. But it seems in asia, an issue with the engine always ends up in a top overhaul or complete overhaul which is where some mechanics do take the full opportunity of the situation. Nevertheless, we as graduates should know better to investigate before deciding next move or taking further action.</p><p></p><p>Deep DeEp @ Heisenberg</p></blockquote><p></p>
[QUOTE="airtube, post: 736331, member: 11123"] For a start now, I can share my compression test readings and procedure on how i did it. Very easy. 1. Open engine cover. 2. Remove all Ignition coil. 3. Remove all spark plug. 4. Check spark plug for trace of engine oil. If there is engine oil on plug thread, high possibility valve cover gasket need replacement - that procedure I will share in another post. 5. Remove Fuel fuse under glovebox (No 31 for E39 cars). 6. Insert and tighten the compression meter into cylinder 1. 7. Press accelerator/throttle full. 8. Turn key to start engine and allow 5 time engine cranking. 9. Note down readings. 10. Repeat (6) to (9) for all other cylinders. Warning: do not conduct this act alone as a bad compression reading can cause depression to the car owner and nobody will be around to cheer him up.... My M54B30: 190psi, 185psi, 185psi, 185psi, 185psi, 185psi M54B22: 210psi, 220psi, 195psi, 205psi, 225psi, 205psi M54B25: 188psi, 186psi, 170psi, 180psi, 175psi, 195psi Remember that in western and developed countries, it is a norm to conduct a compression test regularly and of course before a purchase of a car or engine. But it seems in asia, an issue with the engine always ends up in a top overhaul or complete overhaul which is where some mechanics do take the full opportunity of the situation. Nevertheless, we as graduates should know better to investigate before deciding next move or taking further action. Deep DeEp @ Heisenberg [/QUOTE]
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