FLYWHEEL

I removed my flywheel to clean things up before I put my new clutch together.

Is it possible to put the flywheel on wrong so that the timing mark is 180 deg out?

It's bloody heavy and I struggled to lift it on with one hand - I have a "bung" hand at the moment and I'm not keen to take it off and put it on again if I can avoid it. :x

It's a TEA20-80.

The only reference I can find in the manual is on page C33 of the engine chapter. It reads;

"Replace flywheel. Dowel holes in flywheel are 90 deg apart, while those in flange are 180 deg apart. Thus re-location of dowel provides four alternative mounting positions for flywheel"

They way I read it means, I can put it back on in any position. But there appears to be a thin line on the edge of the flywheel that looks like a timing mark.

If I replace the flywheel any which way then surely that mark will be rendered meaningless. :?

Any thoughts?

[b:52d5e09a0f]Doc.[/b:52d5e09a0f] The timing marks on the edge of the flywheel line up with a "V" slot cut in the "hole" where the starter motor fits.



When No 1 piston is at TDC, the "0" timing mark on the edge of the flywheel will align with the timing mark in the starter motor "hole".

A 1/4 inch rod will go through the hole in the block below the starter and align with a corresponding hole in the flywheel.

So, all you need to do it start with # 1 piston at TDC.

Bob in Oz
'53 TEA20

Bob,

I have no timing marks at all. Nothing.

The manual talks about chalking the the flywheel when setting the timing chain etc. No timing marks.

I know what your thinking....."he's not looking properly", BUT believe me when I say, I've had the flywheel off, lying on a bench, inspected it and NO TIMING MARKS!! :twisted:

I dunno. :?

I have a hunch that early models have the marks up near the fan.Like a car.

"Is it possible to put the flywheel on wrong so that the timing mark is 180 deg out?"

Click to expand...

"I have no timing marks at all. Nothing."

Click to expand...

[b:6f321ab822]Doc[/b:6f321ab822] ...... C'mon now - how do you time the 80 mm engine if there are no timing marks??? :shock:

[b:6f321ab822]Bendee[/b:6f321ab822] is correct - Manual page G.17 para 2 (c) states:
[i:6f321ab822]"tractors of early manufacture have a vee mark on the inner rim of the fan belt drive pulley and a corresponding cast mark on the timing cover"
[/i:6f321ab822]
Manual page C.33 para 12 states:
[i:6f321ab822]"Replace flywheel. Dowel holes in flywheel are 90° apart while those in flange are 180° apart. Thus relocation of dowel provides four alternate positions for flywheel."[/i:6f321ab822]

I can't find any manual references to a "correct" position for the flywheel.

I've never seen the timing marks on an 80 mm engine but the following appears logical:

1. The position of the flywheel on the crank shaft flange can not affect valve or ignition timing as the timing marks are on the [u:6f321ab822]front[/u:6f321ab822] crankshaft pulley and timing case, [u:6f321ab822]not[/u:6f321ab822] on the flywheel.

2. I'm guessing you have the option to mount the flywheel in any of four positions due to either: crankshaft/flywheel balance; or to change the position the starter motor engages the ring gear?

I doubt it is balance as that would imply the crank shaft and flywheel were dynamically balanced as one unit at manufacture - I've only ever seen that on performance engines and there would probably be matching marks.

The starter motor pinion generally only engages the flywheel ring gear in two (?) positions, which should be apparent from ring gear wear. I'm guessing, but you can probably rotate and relocate the flywheel 90° out from it's previous position, to present an unworn section of ring gear to the starter pinion???

In answer to your original question: I can't see how flywheel position can have any affect on valve or ignition timing.

[i:6f321ab822]Caveat Emptor![/i:6f321ab822]

Posted at 04.59 am - back to my early morning coffee!! :lol:

Bob in Oz
'53 TEA20

Gents,

Thanks. It's always nice to talk these things through.

I've assembled it all. I hope I did it right. :?

I didn't realise there were so many various flywheels used during the model run! :shock: