onesea Posted January 11, 2023 Share Posted January 11, 2023 found this lurking somewhere on the internet, is it correct? SOURCES OF ENGINE NOISE 1) MISFIRING or BACKFIRING. POSSIBLE CAUSES. - Fuel in tank has wrong octane/cetane number, or is wrong type of fuel. - Ignition system faulty. - Engine temperature too high. - Carbon deposits in the combustion chamber start to glow and cause misfiring. - Timing incorrect, which causes misfiring in the intake/ exhaust system. REQUIRED ACTION - Determine which type of fuel was last put in the tank. - Check the ignition system - Check the engine cooling system - Remove the carbon deposits by using fuel additives and driving the vehicle carefully - Check the timing 2) VALVE TRAIN FAULTY. POSSIBLE CAUSES. - Valve clearance too large due to faulty bucket tappets or incorrect adjustment of valve clearance. - Valve timing incorrectly adjusted valves and pistons are touching. - Timing belt broken or damaged. REQUIRED ACTION - Adjust valve clearance if possible and renew faulty bucket tappets – check cam condition. - Check the valve timing and adjust if necessary. - Check timing belt and check pistons and valves for damage – renew any faulty parts. 3) FAULTY ENGINE COMPONENTS. POSSIBLE CAUSES. - Pistons. - Piston rings. - Cylinder head gasket. - Big-end and/or main bearing journals. REQUIRED ACTION. - Disassemble the engine and check components. 4) ANCILLARY COMPONENTS POSSIBLE CAUSES - Engine components or ancillary components loose or broken. REQUIRED ACTION. - Check that all components are secure, tighten/ adjust as required. Renew if broken. Quote Link to comment Share on other sites More sharing options...
Ian Frog Posted January 11, 2023 Share Posted January 11, 2023 As with almost anything like this on the net it`s not wrong per se but it is over simplistic. It takes a lot of experience to start diagnosing faults by sound alone and I for one would be looking for a lot of other factors before plumping for a cause and getting the spanners out. Sorry if that`s not much help. Cheers Ian Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted January 11, 2023 Share Posted January 11, 2023 When exploring engine noises I find a mechanic's stethoscope takes a lot of guesswork out of the process. Considering how cheap they are it's amazing how few people have one. Quote Link to comment Share on other sites More sharing options...
JRH Posted January 11, 2023 Share Posted January 11, 2023 28 minutes ago, Mississippi Bullfrog said: When exploring engine noises I find a mechanic's stethoscope takes a lot of guesswork out of the process. Considering how cheap they are it's amazing how few people have one. Mine doubles up as a screwdriver. 1 2 Quote Link to comment Share on other sites More sharing options...
Fiddlesticks Posted January 11, 2023 Share Posted January 11, 2023 My wife goes nuts if I stick a cotton bud in my ear, I'm not risking it with a screwdriver! 1 3 Quote Link to comment Share on other sites More sharing options...
V650 Posted January 11, 2023 Share Posted January 11, 2023 1 hour ago, Mississippi Bullfrog said: When exploring engine noises I find a mechanic's stethoscope takes a lot of guesswork out of the process. Considering how cheap they are it's amazing how few people have one. Can be very handy when you are deaf as a post like I am Quote Link to comment Share on other sites More sharing options...
Tiggie Posted January 11, 2023 Share Posted January 11, 2023 4 hours ago, Mississippi Bullfrog said: When exploring engine noises I find a mechanic's stethoscope takes a lot of guesswork out of the process. Considering how cheap they are it's amazing how few people have one. I wonder if I could use my Wife's Midwifery Pinard? 3 Quote Link to comment Share on other sites More sharing options...
Ronnie Posted January 11, 2023 Share Posted January 11, 2023 5 hours ago, Fiddlesticks said: My wife goes nuts if I stick a cotton bud in my ear, I'm not risking it with a screwdriver! Just use the handle end, not the pointy bit ! 3 Quote Link to comment Share on other sites More sharing options...
Stu Posted January 12, 2023 Share Posted January 12, 2023 On 11/01/2023 at 16:59, JRH said: Mine doubles up as a screwdriver. Same! A trick my dad taught me early on 1 Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted January 12, 2023 Share Posted January 12, 2023 I've often used a screwdriver, but a proper stethoscope is cheap, much easier to use, safer and if you get the type with a probe very very accurate. 2 Quote Link to comment Share on other sites More sharing options...
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