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  #1  
Old 07-07-2003, 07:53 PM
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220sb TDC questions

Hello everyone. I am at the end of reassembling the enigne out of my 62 220sb. But, now that I have it all together, including setting the timing, I am thinking I may have set TDC at the exhaust stroke. Does anyone have inof on how I can tell if I am at the compresion or the exhaust stroke. How should the rest of the pistons look?

Any help would be greatly appreciated

Marc
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  #2  
Old 07-07-2003, 08:18 PM
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Can you compare the position of the cam lobes and the distributor rotor?

Sixto
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  #3  
Old 07-07-2003, 08:27 PM
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220sb tdc question

That is part of my problem. The whole engine was disassembled. I'm not sure if everything is lined up correctly and the palce to start is setting the #1 at TDC in the compression stroke.

Marc
1962 220sb
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  #4  
Old 07-07-2003, 11:30 PM
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Are you doing this without a manual? There should be an indicator on the timing chain cover and degree marks on the crank pulley. That will tell you where crank TDC is. I hope the pointer isn't adjustable as on the OM603. Without knowing how to align the cam sprocket to a reference or knowing the specs of the cam, it'll be difficult to check cam timing. The rule of thumb will be to check that the intake valve just closed so the #1 intake lobe point should be about 90-degrees past the valve stem and the #1 exhaust lobe point should be about 270-degrees from the valve stem. Distributor timing is less of a problem since you can check it with a timing light while cranking.

These are generic suggestions. There might be nuances of the M127(?) that I'm not familiar with.

Sixto
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Old 07-08-2003, 01:16 AM
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When Crank pointer is at TDC, the cam index mark should line up with the slot on the front cam tower...
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  #6  
Old 07-08-2003, 04:53 AM
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I use a screw in compression tester screwed into number one plug hole , when turning engine over buy hand compression gague will start to rise on compression stroke then its just a matter of lining up TDC mark on balancer.......
Wiliam Rogers........
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  #7  
Old 07-08-2003, 08:51 AM
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With #1 piston up as indicated by the crank pointer you are either on number one or you are on number six. if you were to rotate the crank 360 degrees you would be on the other.

Since the cam aligns as Arthur states your question then comes as to where to put the distributor.

To tell whether you are at one or six look to the lobes of the cam on these two cylinders. The one that has the lobes up (rabbit ears) is the firing cylinder. The one with lobes down is not.
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