rodgling
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| posted on 12/6/12 at 10:55 PM |
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clanky sound while cranking, flywheel?
Just installed a replacement M3 engine, first start tonight.
It runs with good oil pressure... but when cranking it sounds very "clanky" for want of a better word. The regular "thump thump
thump" of cranking has a more clangy sound to it.
Could this be due to fitting a lightweight flywheel instead of the dual mass? It doesn't sound like my old engine did which died of big-end
failure (I did the big ends before installing the new engine and didn't see any badly worn bearings or crank damage).
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rodgling
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| posted on 13/6/12 at 09:24 AM |
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Youtube link: http://www.youtube.com/watch?v=O7ST5sXwJP4&feature=plcp
Could be engine hitting the chassis?
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MakeEverything
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| posted on 13/6/12 at 12:35 PM |
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yep, sounds like its hitting the frame or a panel somewhere.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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rodgling
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 posted on 13/6/12 at 07:42 PM |
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Took the afternoon off to work on the car and get to the bottom of this... Found a bit that was very close to the chassis, so I sorted that out with a
hacksaw, then started the car... and the starter did absolutely nothing.
Cue FOUR HOURS of tracing wiring and cursing... and then it started working for NO REASON AT ALL (ok maybe the battery was a bit flat but I'd
have expected something from the starter).
And then I found that the engine's actually in firm contact with the chassis somewhere else (on the sump). So in summary I've taken the
afternoon off to solve this noise and achieved zip. Bloody cars.
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MakeEverything
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| posted on 13/6/12 at 09:53 PM |
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Check all your earths. I had a slightly loose earth once and it gave me the same intermittent symptoms.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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rodgling
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| posted on 13/6/12 at 09:56 PM |
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Will do, thanks, I guess the engine block - battery earth path is the most critical?
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DIY Si
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| posted on 14/6/12 at 12:11 PM |
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It certainly is as far as starting is concerned!
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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rodgling
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| posted on 14/6/12 at 08:57 PM |
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Yup, engine was touching the chassis. Fixed now and it sounds healthy again. Phew.
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