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  #1  
Old 05-31-2008, 07:37 PM
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Default How to set timing

Hey...question about setting the timing... From what i understand the notch on the crankshaft gear needs to be lined up with the top mark on the oil pump. At the same time the marks on the cam gears need to be lined up with the notches in the timing belt cover....

Since the crankshaft rotates twice per every rotation of the timing gears, the notch on the crank gear could line up in 2 different positions. How do you know that the crank is in the right position?

Or am i thinking about this all wrong?

Oil Pump Mark...
Click the image to open in full size.


Which notch/mark should be used to line up to this? the notch on the Pulley:
Click the image to open in full size.

OR the notch on the gear?
Click the image to open in full size.


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Old 05-31-2008, 07:42 PM
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Default RE: How to set timing

Notch on the timing gear.
You will need to make sure you are on the compression stroke.
Or there is supposed to be a special tool that gets inserted into a hole in the block to lock the crank. The hole is where a torxes screw is in the block behind the starter.
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Old 05-31-2008, 08:02 PM
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Default RE: How to set timing

How do you know it's on the compression stroke and not the exhaust stroke? Maybe i'm thinking about this way too hard, but it's not making sense to me..but if onen pison is compresing or going to TDC, another piston is moving towards the BDC.

Should a certain piston number be at any particular postion (top or bottom) when it's set correctly?
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Old 05-31-2008, 10:54 PM
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Default RE: How to set timing

The notch on the crank gear. I believe you should have cylinder #1 at TDC on the compression stroke.
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Old 06-01-2008, 01:43 AM
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Default RE: How to set timing

And if you have already installed the camshafts correctly, with all spark plugs removed, insert your finger into the cyl-1 plug hole while rotating the crank. If it's on the compression stroke, you will feel pressure rise, but if it's on the exhaust stroke, you will not feel pressure as the air is escaping through the exhaust valves.

So, please specify at what stage you are (head already on, head still off, timing belt installed or not, etc...). More pics would be definitely helpful.


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Old 06-01-2008, 07:57 AM
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Default RE: How to set timing

Once the head is on before installing the cams all the valves on the head will be closed. Then you can turn the motor over some and check for the compression stroke. #1 will be up top.

But either way if you have the mark lined up then all should be fine. The Cams are what makes it the compression stroke and exhaust stroke. So it all is lined up all should be fine.
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Old 06-01-2008, 07:57 AM
 
 
 
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140, 1995, 850, adjust, basics, compression, corvair, set, setting, stroke, time, timing, timming, volvo, volvos


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