Timing gear help

forzainformer2 · Dec 7, 2018

So when I wrecked my truck and i was headed home the truck shut of and wouldn’t start up again, I’ve found where the problem is coming from the timing gear on the crank. I can make the engine turn over till the sun goes down and the whole crank is turning but I the cam will not, the belt isn’t broken so it has lead me to believe that it is in fact the timing gear on the crank. My question is what should I be looking for to be broke on it? Is there a keyway or something else holding that gear in place? Any help would be greatly appreciated!!!!

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RonD · Dec 7, 2018

Yes, there is a woodruff/machine key that times crank with belt gear

Picture here: https://www.2carpros.com/images/question_images/3291/original.jpg

Best guess would be the crank pulley was hit in the accident which caused the woodruff key to shear off

forzainformer2 · Dec 8, 2018

RonD said:
Yes, there is a woodruff/machine key that times crank with belt gear

Picture here: https://www.2carpros.com/images/question_images/3291/original.jpg

Best guess would be the crank pulley was hit in the accident which caused the woodruff key to shear off

The engine broke off the mounts and jumped forward, i have no clue what it couldve hit in the impact because the only body damage i have is the bumper.

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tomw · Dec 8, 2018

One other possible problem causing the cam to stay still would be if the belt had a lot of teeth sheared and they happened to be at the crankshaft sprocket. The crankshaft would turn, the sprocket turn, and the belt stay still, possibly moving back and forth a bit as the sprocket teeth bumbled over the remains of the belt teeth.
You could remove the belt cover, and move the belt manually, either by grabbing and pulling, or by using the aux or cam sprockets to move the belt. Once moved, you could examine the belt for tooth loss. You'd also have viewable access to the crankshaft sprocket.
To replace the crankshaft sprocket requires removal of the crank pulley/damper, also required(you can do it but not recommended) to replace the timing belt.
tom

forzainformer2 · Dec 12, 2018

tomw said:
One other possible problem causing the cam to stay still would be if the belt had a lot of teeth sheared and they happened to be at the crankshaft sprocket. The crankshaft would turn, the sprocket turn, and the belt stay still, possibly moving back and forth a bit as the sprocket teeth bumbled over the remains of the belt teeth.

You could remove the belt cover, and move the belt manually, either by grabbing and pulling, or by using the aux or cam sprockets to move the belt. Once moved, you could examine the belt for tooth loss. You'd also have viewable access to the crankshaft sprocket.

To replace the crankshaft sprocket requires removal of the crank pulley/damper, also required(you can do it but not recommended) to replace the timing belt.

tom

The key is missing by the looks of it the gear isnt turning either when we rotate the motor.

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tomw · Dec 12, 2018

forza:"The key is missing by the looks of it the gear isnt turning either when we rotate the motor."

Does this mean the sprocket on the crankshaft remains stationary when the crankshaft turns? Or. Does this mean the cam shaft sprocket remains fixed when the crankshaft rotates?

The key on the crankshaft is not designed to bear the load, I think, and is used more to get correct position of the gear. IOW, I think the fastener must be tightened to 80+ ft/lb to keep all things aligned, so the key does not get sheared. If not, well there you go.
If/when you decide to replace the key and belt(why not it's all apart anyway?), you can use rope down a spark plug hole to block the engine from turning while you wrench on the pulley bolt. The rope will act as a soft block when the piston gets to TDC, keeping the crankshaft stationary.
tom

forzainformer2 · Dec 13, 2018

tomw said:
forza:"The key is missing by the looks of it the gear isnt turning either when we rotate the motor."

Does this mean the sprocket on the crankshaft remains stationary when the crankshaft turns? Or. Does this mean the cam shaft sprocket remains fixed when the crankshaft rotates?

The key on the crankshaft is not designed to bear the load, I think, and is used more to get correct position of the gear. IOW, I think the fastener must be tightened to 80+ ft/lb to keep all things aligned, so the key does not get sheared. If not, well there you go.

If/when you decide to replace the key and belt(why not it's all apart anyway?), you can use rope down a spark plug hole to block the engine from turning while you wrench on the pulley bolt. The rope will act as a soft block when the piston gets to TDC, keeping the crankshaft stationary.

tom

The sprocket does stay stationary when the crank rotates and the belt is definitely getting replaced.

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forzainformer2 · Dec 14, 2018

Can someone give me the dimension/Shape of the key on the crankshaft for the timing gear?

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RonD · Dec 14, 2018

What year engine?

forzainformer2 · Dec 15, 2018

RonD said:
What year engine?

97 2.3

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forzainformer2 · Dec 18, 2018

Bump

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Timing gear help

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