Valve Adjustment for MID ENGINE VW engine

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Valve Adjustment for MID ENGINE VW engine

Postby Larry Jowdy » Wed Jul 19, 2006 8:26 am

Locate top dead center by removing the distributor cap and rotating the engine clockwise (looking from the seat of the car towards the rear of the car) until the TDC mark is at the 12 o'clock position. The rotor should be pointing towards the notch in the rim of the distributor and also pointing at the position on the distributor cap that contains the #! plug wire. If it's pointing anywhere else, try again. Use a large adjustable wrench to turn the pulley nut, which in turn will rotate the engine..

(firing order is as follows for Type 1, 2,3 &4 engines) 1-4-3-2
Cylinder arrangement for a left hand drive, mid engine car is as follows: Looking from the front of the car towards the rear of the car, #1 is closest to the rear on the drivers side, #2 is closest to the front of the car on the drivers side. #3 is closes to the rear of the car on the passenger side and #4 is closest to the front of the car on the passenger side)

Once the rotor is aligned with the notch in the rim of the distributor and the TDC mark is at the 12 o'clock position, remove the valve cover on the drivers side of the engine. (This is for left hand drive cars, if you have a right hand drive, then #1 is on the passenger side)

The (2) valves closest to the rear of the car are for the #1 cylinder.
(The inside valve controls intake the outside valve controls exhaust)

Reach in and grab the pushrod, twist the rod and it should spin freely but not to loose This equates to "O" lash provided you have chromoly push rods, which most of you do have. (Note:::: If you're running a 356/912 engine or a \"stone\" stock VW with aluminum pushrods, adjust the intake to .004 and the exhaust to .006 (The exhaust ports and corresponding valves are always the valves closest to the outside of the cylinder head. The (2) center valves (1 for each cylinder) control the intake valves)

After adjusting both the intake and exhaust then the next step is to rotate the engine \"\"counterclock\"\" wise one half of a turn. This will bring up the BDC mark to the 12 o'clock position. Adjust the #2 intake and exhaust valves, on the cylinder next to #1.

Next step, Rotate the engine one half turn \"counterclock\" wise until the TDC mark is at the 12o'clock position. Remove the valve cover on the passenger side and adjust both valves on the #3 cylinder The (2) valves closest to the rear of the car are for the #3 cylinder.

Final step, Rotate the engine one half turn \"counterclock\" wise until the BDC mark is that the 12 o'clock position and adjust both valves on the #4 cylinder.

Install new gaskets on the valve covers and re-install.

You're done.

The firing order for a VW or Porsche engine is 1-4-3-2- By rotating the engine
backwards, the valve adjustment order becomes 1-2-3-4-

Cylinder identification is as follows.
#1 is closest to the rear of the car on the drivers side.
#2 is closest to the front of the car on the drivers side.
#3 is closest to the rear of the car on the passenger side
#4 is closest to the front of the car on the passenger side

FYI, the reason you rotate the engine counterclock wise during adjustment is to keep you from going from the drivers side to the passengers side and back and forth. This way, you adjust both cylinders on the same side at the same basic time.
Good luck
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Last edited by Larry Jowdy on Tue Oct 26, 2010 4:32 am, edited 5 times in total.
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Postby Larry Jowdy » Wed Jul 19, 2006 8:28 am

By the way, if you're unsure about having the car at TDC #!, have a friend rotate the engine \"clockwise\" as you're looking at the valves. Watch the exhaust valve on #1 (it's the valve closest to the exhaust pipe) As it starts to close, it's approaching TDC. Once the pulley mark is right at the point where the case splits, that's TDC.

ALSO!!!! with the pulley lined up at TDC, look at the rotor, it should be pointing at the #1 spark plug wire.

35 degree's is probably too much advance for the engine to live properly but that depends on the octane you have available. Here in the states, I don't recommend any more than 28 degree's advance. That reading is taken with the engine turning around 3,000 RPM's. Once you reach 28 degrees advance, lock down the distributor.

If you have to change the distributor, line up the #1 spark plug with the rotor at the mark. Looking from the fan belt side of the engine, the first hole left of #1 is #4 and continuing clockwise, 3 then 2.

If you have to do this, you'll also have to re-time the engine
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