TDC marks on #2 cylinder? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
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post #1 of 6 Old 05-18-2017, 07:30 PM Thread Starter
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TDC marks on #2 cylinder?

I am sure as heck no mechanic. Just curious enough to kill a mess of cats.

I have a '52 8N which has had a rebuilt block put in near 4 years ago. Lately it's started running poorly, and I've started messing about trying to get it right again. All new tune up components, clean the air intake, etc.

Well, the thing won't run right, it'll start and idle real nice at low rpm (500-600), but as soon as I tried to pick up the rpm it stutters and dies.

I start poking around with the timing. Loosening the cap screw and turning the distributor back and forth didn't make any difference in the running at all. So I took out the spark plugs, took off the distributor, and loosened the cover over the flywheel timing marks window. I cranked over the engine with my finger over the #1 spark plug hole, feeling for the compression stroke and trying to find the timing marks, couldn't find them. So just for giggles, I tried using the #2 piston and guess what? There they are.

So the questions are...
1) Aren't those marks supposed to appear in the window when #1 comes up on the compression stroke?
2) How, using your thumb, can you tell compression from the exhaust stroke?
3) Since there are allegedly timing marks 180 d apart, how do us tinkerers tell if we're on the right set of marks (flywheel rotates half as often as the crankshaft so
both count as TDC?)
4) Why are those marks coming up on the #2 piston?

I sure could use a hand with this, so thanks up front!
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post #2 of 6 Old 05-18-2017, 11:57 PM
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Re: TDC marks on #2 cylinder?

not to be a wise but t or any thing
but if you walk away from it
and find some one to fix the carb for you it will cost a lot less

john
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post #3 of 6 Old 05-19-2017, 09:01 AM
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Re: TDC marks on #2 cylinder?

As suggested, your original problem may be fuel delivery.

For timing look here>>>http://www.ntractorclub.com/howtos/p...-Procedure.pdf

For your #2.) When it's coming up on the compression stroke, the pressure will blow your finger off the spark plug hole. You won't feel that strong of force on the exhaust stroke as the exhaust valve is open and the pressure will take the path of least resistance.

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post #4 of 6 Old 05-19-2017, 02:23 PM Thread Starter
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Re: TDC marks on #2 cylinder?

For timing look here>>>http://www.ntractorclub.com/howtos/p...-Procedure.pdf

Yes, that's the page that got this started.
Once the compression stroke is felt, shouldn't the timing marks be close by? They are if I use #2 piston, they're right there.
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post #5 of 6 Old 05-19-2017, 04:18 PM
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Re: TDC marks on #2 cylinder?

Quote:
Once the compression stroke is felt, shouldn't the timing marks be close by?
TDC is at the end of the compression stroke, not at the beginning, so you would need to go past where you start to feel compression with your thumb, but I can't say just how far that might be. Finding TDC on a flathead is more an art than a science. Once you feel the compression start keep turning the engine while you look for the timing marks. If it didn't go more than a quarter turn of the crank then that's probably it.

If turning the distributor didn't make a difference in how it runs then I doubt that the timing is your issue. First test the spark to make sure that you have a good strong blue/white spark that will jump at least a 1/4" gap to a clean ground spot. Once you know you have spark then move on to fuel.

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post #6 of 6 Old 05-21-2017, 10:01 PM Thread Starter
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Re: TDC marks on #2 cylinder?

Rotated spark wires one spot clockwise. Idles nice & smooth. Carb on order.
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