22 R-E Finding TDC
11-26-2010, 06:18 PM
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22 R-E Finding TDC
I am replacing the head on a 95 4Runner with the 22 R-E Engine. Problem is I took it apart and then it sat for 3 months. I am certain I left the engine at TDC but now that I'm putting it together I'm not so sure of the Cam shaft.
The rocker arm assembly is and all torqued per spec. But now I am staring at this thing trying to remember how to get the camshaft in the correct position before I put the timing belt on the pulley.
Can anybody help me? Thanks!
The rocker arm assembly is and all torqued per spec. But now I am staring at this thing trying to remember how to get the camshaft in the correct position before I put the timing belt on the pulley.
Can anybody help me? Thanks!
11-28-2010, 12:49 PM
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Location: Nashville TN. I can help you if you're close BUT NOBODY CAN HELP YOU IF YOU DON'T FILL YOUR LOCATION IN!
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Right, and OP, 4 cylinder 4 cycle engine... With a 1, 2, 3, 4 firing order...
Though the physical piston will be at "TDC" it could be at a different process in the 4 cycle process.
And how you tell that is by the brains of the operation... The cam.
If the cam dowel is at 12:00 it's at TDC. #1 is set at it's compression stroke.
If the cam is at 6:00 and the crank is still at 0, it's at B-TDC. #4 is at it's compression stroke, and #1 is at it's exhaust...
And it's because of this, the problem of confusing #1 with #4 happens all the time.
Though the physical piston will be at "TDC" it could be at a different process in the 4 cycle process.
And how you tell that is by the brains of the operation... The cam.
If the cam dowel is at 12:00 it's at TDC. #1 is set at it's compression stroke.
If the cam is at 6:00 and the crank is still at 0, it's at B-TDC. #4 is at it's compression stroke, and #1 is at it's exhaust...
And it's because of this, the problem of confusing #1 with #4 happens all the time.
11-28-2010, 01:14 PM
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^^^ yup cam dowel at the top is TDC for the cam. TDC for the crank is the exact same for #1 and #4 on our motors since they are counter balanced shafts. Now when you put the two together via the timing chain then the TDC on the crank becomes different as there will be those two TDC's 1 exhaust and 1 compression. #1 Compression TDC is what is always generally refereed to as TDC.
The answer to your question on how to put that camshaft on correctly would be found in the FSM as the Wabbit mentioned.
but in case your one of the lazy ones that does not read it or go into jobs like this not following it like you should be, then here is a photo.
Sorry if I seem rude, but getting tired of people asking questions that can be simply found in the FSM that any person working on their truck them selves should have to begin with. Especially when it's free.
The answer to your question on how to put that camshaft on correctly would be found in the FSM as the Wabbit mentioned.
but in case your one of the lazy ones that does not read it or go into jobs like this not following it like you should be, then here is a photo.
Sorry if I seem rude, but getting tired of people asking questions that can be simply found in the FSM that any person working on their truck them selves should have to begin with. Especially when it's free.
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