Flywheel missing teeth!!
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Senior User
Joined: Dec 2003
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From: Sunny Central Oregon
Flywheel missing teeth!!
Just a quick question. I removed the starter to check if it was engaging the flywheel and noticed that there were at least two teeth completly gone. I have been driving this truck for a year with no problems. Can I fix this without pulling the motor?
Thanks, Ray
Thanks, Ray
Senior User
Joined: Oct 2003
Posts: 191
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From: Portland Oregon
You might want to think about the cause of your missing teeth.
One scenerio is timing that is firing on start up before the
rotating parts are where they should be. Untill there is enough
momentum a piston that is fired before top dead center can
force your crank backwards for a backfire. A starter can cause
your problem but in theory starter teeth give way to flywheel teeth.
You also could have a flywheel tooth starter tooth mismatch.
Hope this helps!
One scenerio is timing that is firing on start up before the
rotating parts are where they should be. Untill there is enough
momentum a piston that is fired before top dead center can
force your crank backwards for a backfire. A starter can cause
your problem but in theory starter teeth give way to flywheel teeth.
You also could have a flywheel tooth starter tooth mismatch.
Hope this helps!
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Senior User
Joined: Dec 2003
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From: Sunny Central Oregon
Thanks for the replys. Let me know if I did something really stupid that could cause futher damage to the motor.
I turned the motor by hand and then reinstalled the starter so it would engage the flywheel. It started, but runs rough.
Fordpilot, please explain the timing issue. How do I know if I have the correct starter for my flywheel?
Thanks, Ray.
I turned the motor by hand and then reinstalled the starter so it would engage the flywheel. It started, but runs rough.
Fordpilot, please explain the timing issue. How do I know if I have the correct starter for my flywheel?
Thanks, Ray.
Senior User
Joined: Oct 2003
Posts: 191
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From: Portland Oregon
Timing ..backfire..in theory if you rotate your crank
by hand slowly there is a point at top dead center
where the crank and the piston rod are straight
or aligned. With no rotational momentum energy
if the piston gets its combustion pressure at that point
the crankshaft does not know which way to go
..normal starting and running or backward [backfire].
Once running or rotating there is no problem as you have
substantial mass including fly wheel going in the correct
rotational direction and you can time ignition way before
TDC. At start up however you have a split second
before your rotational momentum is developed...and
if your timing is to advanced you can get a backfire
driving ring gear opposite of starter gear with resultant
ring gear or starter gear damage. All of this
is a ..or so I have been told deal so maybe someone
else can jump in.
by hand slowly there is a point at top dead center
where the crank and the piston rod are straight
or aligned. With no rotational momentum energy
if the piston gets its combustion pressure at that point
the crankshaft does not know which way to go
..normal starting and running or backward [backfire].
Once running or rotating there is no problem as you have
substantial mass including fly wheel going in the correct
rotational direction and you can time ignition way before
TDC. At start up however you have a split second
before your rotational momentum is developed...and
if your timing is to advanced you can get a backfire
driving ring gear opposite of starter gear with resultant
ring gear or starter gear damage. All of this
is a ..or so I have been told deal so maybe someone
else can jump in.
New User
Joined: Oct 2001
Posts: 21
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From: Louisiana
normal wear
If you remove the stater again and rotate the flywheel/flexplate a full 360 degrees, you will find 3 places that are showing more tooth wear than the rest of the ring gear. Most of the time when you shut a motor down it stops in one of three places, therefore when you start it again most of the time the drive will engage in one of those three places. If you have been driving it for any amount of time without any problems then your starter is correct. If there is a mismatch, tooth count wise, it will only take one starting attempt to figure that out, and you won't have to ask anybody. Rotating the motor by hand has nothing to do with it running rough, a coincidence.
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Senior User
Joined: Dec 2003
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From: Sunny Central Oregon
Thanks, so I must have the timing set too far advanced. I will try to clean up my timing marks and make sure I have it set to the correct one (there were two painted marks).
Is it going to hurt anything to run with missing teeth in the flywheel?
Is it going to hurt anything to run with missing teeth in the flywheel?
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Senior User
Joined: Oct 2003
Posts: 191
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From: Portland Oregon
teeth gone is substantial mechanical rudeness which
can be caused by sarting backfire incidences. To
understand such scenario you need to visualize
internal geometry of engine and role of
timing at the instant of startup. Incorrect timing
definetly can cause rough running.
can be caused by sarting backfire incidences. To
understand such scenario you need to visualize
internal geometry of engine and role of
timing at the instant of startup. Incorrect timing
definetly can cause rough running.
New User
Joined: Oct 2001
Posts: 21
Likes: 0
From: Louisiana
What was the original problem? What was happening that caused you to remove the starter? How was the truck running the last time you drove it prior to removing the starter? There is no correlation between incorrect timing and rotating the engine by hand, given that the distributor had not been disturbed. What was the last engine related change that you performed prior to removing the starter? Missing teeth and severely worn teeth are two different things.
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Get yourself another flywheel or flex plate..go to NAPA and get a new starter one that matches your old one.... Check your timing to make sure your not too far advanced, set it, and forget it, your good to go....Good Luck, Russ
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