Miks15
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| posted on 5/2/10 at 07:34 PM |
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finding TDC-BMW M40 engine
Hi all,
I need to get a toothed wheel cut to run my edis with, problem is i dont know how to find the TDC on my engine. Its a 1.6 M40 BMW engine.
I couldnt see any timing marks, but was wondering if theres any easy way of finding TDC?
Cheers all
Mikkel
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rusty nuts
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| posted on 5/2/10 at 07:48 PM |
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If iot's the same as some BMWs I've worked on there will be a hole in the block on the left hand side at right angles to the flywheel.
Insert a round bar screwdriver etc into the hole and rotate the crank until the bar goes into the flywheel . Should then be set at TDC.
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scudderfish
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| posted on 5/2/10 at 07:55 PM |
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There's an article about this in this months Practical Performance Car mag
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britishtrident
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| posted on 5/2/10 at 07:58 PM |
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Take all the spark plugs out except No1 turn the engine over slowly by hand in the correct until you start to feel compression.
Remove the spark plug and probe down the plug hole to feel the position of the piston using something not likely to cause damage (I generally use a
foot long plastic rod cut from a coat plastic hanger) and then carefully turn the engine slowly by hand until you feel the piston on its highest
point, where rocking the the crankshaft back and forth slightly produces no perceptible movement in the piston.
This TDC no1 cylinder at the end of the compression stroke.
For super accuracy you could use a dial gauge with an extension to go down the plug hole but even without precision tools it is accurate enough to
establish marks for ignition timing.
[Edited on 5/2/10 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Miks15
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| posted on 5/2/10 at 08:12 PM |
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Ahh cool cheers, i will have a look rusty nuts! That would be good if it was like that!
If not ill do your id trident.
I just had a thought of mounting the sensor on an adjustable plate, this way i could fine tune the timing with this, so if i get in roughly in the
right place, then use the adjuster to get it spot on this should work shouldnt it?
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franky
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| posted on 5/2/10 at 10:45 PM |
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is it out of an e36? I've got a bentley manual you can borrow if it'd help?
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Mark G
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| posted on 5/2/10 at 11:25 PM |
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Go careful with locking the flywheel to find tdc as some engines the pistons are all at half stroke (all level) when locked.
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Miks15
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| posted on 6/2/10 at 12:25 PM |
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Just looked in my haynes manual and it described about the locking flywheel...
So have just done that so have now found TDC of piston one, cheers guys 
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