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When I try to manually crank my Toyota Tundra 2008 V8, it

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only moves about 10 degrees...
When I try to manually crank my Toyota Tundra 2008 V8, it only moves about 10 degrees and then stops
Submitted: 1 year ago.Category: Toyota
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12/22/2015
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago
Amedee
Amedee, Toyota Technician
Category: Toyota
Satisfied Customers: 26,816
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. Are you saying that the engine does not move much when trying to start it? Can I start by getting your VIN?

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Customer reply replied 1 year ago
NoI'm in the middle replacing my timing belt. I have almost everything off the front of the motor. The instructions indicate before I remove the old belt, I need to manually crank it so that the markers line up on the cams. However I can only manually turn it about 10 degrees. It "feels" like something is blocking it from moving.
Customer reply replied 1 year ago
I have 2008 Tundra V8 4.7L
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Right, there are going to be "hard spots" when rotating the engine over by hand because of the engine compression.

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Customer reply replied 1 year ago
Vin 5TFR54138X016999
Customer reply replied 1 year ago
That's what I heard, so I removed 4 spark plugs to relieve compression. Now, the 10 degrees of movement is easier, but then it just halts
Customer reply replied 1 year ago
I removed a few spark plugs, front two from each side. Didn't help
Customer reply replied 1 year ago
this "hard spot" feels and sounds like metal hitting metal
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

So it does not turn over or rotate completely? If this is the case, then the pistons are most likley hitting the valves.

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Customer reply replied 1 year ago
It will only rotate 5 to 10 degrees
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Why are you replacing the timing belt?

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Customer reply replied 1 year ago
The truck stalled out while sitting idle at stop sign. The trouble codes indicated a problem with timing belt
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Ok, do we know what the engine compression is at?

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Customer reply replied 1 year ago
I bought a timing belt / water pump kit and am in middle of that chore
Customer reply replied 1 year ago
I have no idea
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Please call me so we can talk on the phone.

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Customer reply replied 1 year ago
Out of funds
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Ok, no problem. Chances are the engine is not rotating because the pistons are hitting the valves.

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Customer reply replied 1 year ago
How do I correct them?
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Well, before you replace the timing belt, you need to check engine compression. If one or more of the cylinders is low, then the cylinder heads need to be removed from the engine block and send out for repair.

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Does that make sense?

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

It sounds like there is internal engine damage and that is why the engine is not rotating.

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Customer reply replied 1 year ago
How do I check that?
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

You need to use an engine compression gauge. Screw it into the cylinder after the spark plugs are removed and crank the engine over.

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Then take a reading

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Does that make sense?

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Have I answered all of your questions?

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Customer reply replied 1 year ago
What should it read? What if the compression is fine?
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Well above 100 psi in all cylinders is a good reading. If the compression is ok, then something else inside the engine is preventing the engine from turning over.

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Have I answered all of your questions now?

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Customer reply replied 1 year ago
I'd like to be understand the "something else" better. What does that mean?
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

It could be anything. Engine disassembly may be needed to figure out what is preventing the engine from turning over.

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Glad I can help

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Customer reply replied 1 year ago
How do I do compression test without starting the vehicle?
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

I just told you. Screw the compression tester into the cylinders after removing the spark plugs. Then crank the engine over. The engine does not need to start to get a reading.

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Customer reply replied 1 year ago
Sorry ... Confused. It will not crank
Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Ok, then engine disassembly will need to be required until you find out what is preventing it from turning over.

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Toyota Mechanic: Amedee, Toyota Technician replied 1 year ago

Hello! It's Amedee from just answer.

I am just checking in to see how things are going and to see if you need any further assistance?

Please let me know and I will be happy to help!

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Amedee
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