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Amedee
Amedee, Toyota Technician
Category: Toyota
Satisfied Customers: 25229
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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When I try to manually crank my Toyota Tundra 2008 V8, it

Customer Question

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
Expert:  Amedee replied 1 year ago.

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?

Customer: 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: replied 1 year ago.
I have 2008 Tundra V8 4.7L
Expert:  Amedee replied 1 year ago.

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

Customer: replied 1 year ago.
Vin 5TFR54138X016999
Customer: 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: replied 1 year ago.
I removed a few spark plugs, front two from each side. Didn't help
Customer: replied 1 year ago.
this "hard spot" feels and sounds like metal hitting metal
Expert:  Amedee 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.

Customer: replied 1 year ago.
It will only rotate 5 to 10 degrees
Expert:  Amedee replied 1 year ago.

Why are you replacing the timing belt?

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

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

Customer: replied 1 year ago.
I bought a timing belt / water pump kit and am in middle of that chore
Customer: replied 1 year ago.
I have no idea
Expert:  Amedee replied 1 year ago.

Please call me so we can talk on the phone.

Customer: replied 1 year ago.
Out of funds
Expert:  Amedee replied 1 year ago.

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

Customer: replied 1 year ago.
How do I correct them?
Expert:  Amedee 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.

Expert:  Amedee replied 1 year ago.

Does that make sense?

Expert:  Amedee replied 1 year ago.

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

Customer: replied 1 year ago.
How do I check that?
Expert:  Amedee 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.

Expert:  Amedee replied 1 year ago.

Then take a reading

Expert:  Amedee replied 1 year ago.

Does that make sense?

Expert:  Amedee replied 1 year ago.

Have I answered all of your questions?

Customer: replied 1 year ago.
What should it read? What if the compression is fine?
Expert:  Amedee 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.

Expert:  Amedee replied 1 year ago.

Have I answered all of your questions now?

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

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

Expert:  Amedee replied 1 year ago.

Glad I can help

Customer: replied 1 year ago.
How do I do compression test without starting the vehicle?
Expert:  Amedee 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.

Customer: replied 1 year ago.
Sorry ... Confused. It will not crank
Expert:  Amedee replied 1 year ago.

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

Expert:  Amedee 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!