ausmini :: View topic - Flywheel Markings upside down

Im in the final stages of putting together an 998 and from what it seems the flywheel markings are 180 deg out !
one and four are at tdc but the flywheel when fitted has the timing marks at the bottom
I think I'm correct in saying the flywheel only goes on one way, right ? as the slot is offset and machine cut to suit the crank tail.
This was the case when i pulled the engine apart as well as i marked the flywheel to the casing and i thought it was odd at the time but just new one and four need to be tdc to stop the gear retaining clip from falling out.
Is this even possible ? as i can't turn the flywheel around
Should i get another flywheel.
it can't have anything to do with the timing as the piston is either tdc or btdc right ?
Any feedback appreciated

miniblue wrote:

Is it a two-piece flywheel? Has the centre been removed at some point and not re-assembled in it's original orientation?

no... it's not 180° out, everything else is - or you've confused yourself.

- you must've had the crank in the wrong position when you put the gears and chain on

are we talking about flywheel to crankshaft here
or cam timing ?
miniblue said the flywheel is out 180 deg

Like DavidE said
Can a two piece flywheel be put together 180 out ?

I am one probably guilty of this and have learnt from my mistakes :cry:

as they say "we learn from our mistakes "
just don't do it again

Author:	miniblue [ Sun May 07, 2017 8:23 am ]
Post subject:	Flywheel Markings upside down
Im in the final stages of putting together an 998 and from what it seems the flywheel markings are 180 deg out ! one and four are at tdc but the flywheel when fitted has the timing marks at the bottom I think I'm correct in saying the flywheel only goes on one way, right ? as the slot is offset and machine cut to suit the crank tail. This was the case when i pulled the engine apart as well as i marked the flywheel to the casing and i thought it was odd at the time but just new one and four need to be tdc to stop the gear retaining clip from falling out. Is this even possible ? as i can't turn the flywheel around Should i get another flywheel. it can't have anything to do with the timing as the piston is either tdc or btdc right ? Any feedback appreciated

Author:	DavidE [ Sun May 07, 2017 9:54 am ]
Post subject:	Re: Flywheel Markings upside down
miniblue wrote: Im in the final stages of putting together an 998 and from what it seems the flywheel markings are 180 deg out ! one and four are at tdc but the flywheel when fitted has the timing marks at the bottom I think I'm correct in saying the flywheel only goes on one way, right ? as the slot is offset and machine cut to suit the crank tail. This was the case when i pulled the engine apart as well as i marked the flywheel to the casing and i thought it was odd at the time but just new one and four need to be tdc to stop the gear retaining clip from falling out. Is this even possible ? as i can't turn the flywheel around Should i get another flywheel. it can't have anything to do with the timing as the piston is either tdc or btdc right ? Any feedback appreciated Is it a two-piece flywheel? Has the centre been removed at some point and not re-assembled in it's original orientation?

Author:	simon k [ Sun May 07, 2017 6:46 pm ]
Post subject:	Re: Flywheel Markings upside down
no... it's not 180° out, everything else is - or you've confused yourself. The timing marks should be at the marker when #1 piston is at the top of the compression stroke. Both valves will be completely closed. If you keep turning the crank (clockwise to the front pulley), the piston will go to the bottom of the bore, then the exhaust valve will open as it comes up again If the valves aren't doing that, then you need to have another go at the cam timing - you must've had the crank in the wrong position when you put the gears and chain on

Author:	slacko [ Sun May 07, 2017 7:03 pm ]
Post subject:	Re: Flywheel Markings upside down
DavidE wrote: miniblue wrote: Im in the final stages of putting together an 998 and from what it seems the flywheel markings are 180 deg out ! one and four are at tdc but the flywheel when fitted has the timing marks at the bottom I think I'm correct in saying the flywheel only goes on one way, right ? as the slot is offset and machine cut to suit the crank tail. This was the case when i pulled the engine apart as well as i marked the flywheel to the casing and i thought it was odd at the time but just new one and four need to be tdc to stop the gear retaining clip from falling out. Is this even possible ? as i can't turn the flywheel around Should i get another flywheel. it can't have anything to do with the timing as the piston is either tdc or btdc right ? Any feedback appreciated Is it a two-piece flywheel? Has the centre been removed at some point and not re-assembled in it's original orientation?

Author:	AEG163job [ Sun May 07, 2017 9:46 pm ]
Post subject:	Re: Flywheel Markings upside down
simon k wrote: no... it's not 180° out, everything else is - or you've confused yourself. - you must've had the crank in the wrong position when you put the gears and chain on Yes, its best to have the crank keyway @ 12 o'clock (timing gear end) before lining up the dots on both gears, as per the diagram in the factory manual, which also states No.1 piston is at TDC when the inlet & exhaust valves on No 4 piston are "rocking". This also correlates with the distributor drive (& hence distributor) ending up in the correct position.

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Flywheel Markings upside down https://ausmini.com/forums/viewtopic.php?f=2&t=95340	Page 1 of 2

Author:	slacko [ Sun May 07, 2017 10:02 pm ]
Post subject:	Re: Flywheel Markings upside down
are we talking about flywheel to crankshaft here or cam timing ? miniblue said the flywheel is out 180 deg

Author:	AEG163job [ Sun May 07, 2017 10:08 pm ]
Post subject:	Re: Flywheel Markings upside down
slacko wrote: are we talking about flywheel to crankshaft here or cam timing ? miniblue said the flywheel is out 180 deg Probably both. As miniblue stated, it appears engine has been apart previously, and maybe incorrectly assembled.

Author:	slacko [ Sun May 07, 2017 10:18 pm ]
Post subject:	Re: Flywheel Markings upside down
Like DavidE said Can a two piece flywheel be put together 180 out ?

Author:	AEG163job [ Sun May 07, 2017 10:23 pm ]
Post subject:	Re: Flywheel Markings upside down
slacko wrote: Like DavidE said Can a two piece flywheel be put together 180 out ? Absolutely. Although I wonder why it would be removed in the first place, unless the hub had fretted on the crank tail, or it was butchered in an attempt to remove a flywheel that refused to budge.

Author:	slacko [ Sun May 07, 2017 10:36 pm ]
Post subject:	Re: Flywheel Markings upside down
Maybe it was pulled apart by someone that thought it had to be and put back together by the same person that didn't take that much attention to where it was when they pulled it apart many a strange thing has happened when people try to do it themselves I am one probably guilty of this and have learnt from my mistakes as they say "we learn from our mistakes " just don't do it again

Author:	AEG163job [ Sun May 07, 2017 10:43 pm ]
Post subject:	Re: Flywheel Markings upside down
slacko wrote: I am one probably guilty of this and have learnt from my mistakes as they say "we learn from our mistakes " just don't do it again I've made some whoppers. Like when I tried to do a Mk2 Jag valve adjustment and ended up bending all the inlet valves. That sure emptied the wallet!

Author:	slacko [ Sun May 07, 2017 11:01 pm ]
Post subject:	Re: Flywheel Markings upside down
AEG163job But did you learn something ? Don't do that the same way again Sorry getting of track a little here , as far as I know , the TDC marks on the flywheel should correspond with cylinders 1 and 4 , flywheel lining up when 1 & 4 at TDC

Author:	AEG163job [ Sun May 07, 2017 11:32 pm ]
Post subject:	Re: Flywheel Markings upside down
Slacko Yes mate, I learnt that I should stick to 4 cylinder engines with no overhead cams! Yes again. But you need #1 piston firing when the TDC marks are at the top (or more correctly about 11.00 o'clock to meet up with the pointer on the clutch cover aperture). This will occur when valves 7 & 8 are opening & closing on No. 4 cylinder. This determines the correct positioning of the distributor drive spindle to ensure the rotor button in the dizzy is correctly delivering a spark to # 1 cylinder, and particularly important if you want all spark plug leads in the correct position if using a dizzy cap with side entry HT leads.

Author:	slacko [ Sun May 07, 2017 11:59 pm ]
Post subject:	Re: Flywheel Markings upside down
AEG163 Yes to all of the above but , lets get back to step 1 aligning miniblue's flywheel with the crankshaft and cylinders 1 & 4 When cylinders 1 & 4 are at tdc , 1/4on on the flywheel should lineup with the pointer on the clutch cover yes ? if not ? has the flywheel been put back together wrong as DavidE may be thinking ? Mark

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Author:	slacko [ Mon May 08, 2017 12:12 am ]
Post subject:	Re: Flywheel Markings upside down
miniblue am I right in assuming , that you are saying , that when pistons 1 & 4 are at top dead centre that your timing marks are at the bottom of your clutch housing ,180deg from the pointer in the clutch cover, maybe I should have asked this before ..