[T2] Timing question (1600cc)

[raceingcajun]

Here is a simple way to keep track of which valves to adjust.....and when:

Align TDC knoch in crankshaft pulley with "split" in case, put paint mark on 
outside edge of pulley matching knoch. Turn crankshaft 180 degrees (1/2 half 
turn) put a paint mark on outside edge of pulley.

1) Turn crankshaft till #1 cylinder is at TDC on the firing stroke. Adjust 
both valves on #1 cylinder. (also #3 cylinder will be at overlap)

            Notice, when you turn the engine backwards starting on number 
one cylinder the firing order is 1 - 2 - 3 - 4 !

2) Turn crankshaft "Backwards" 180' degrees until paint mark lines up with 
case split. Adjust both valves on # 2 cylinder ( #4 will be at overlap)

3)  Turn crankshaft "Backwards" another 180' degrees until paint mark and 
TDC knoch line up with case split. Adjust both valves on
      #3 cylinder

4)  Turn crankshaft "Backwards" 180' degrees until paint mark lines up with 
case split. Adjust both valves on # 4 cylinder
      By doing this you don't need a spotter to turn the crank or watch the 
valves.

Note: These rules are true for any engine with an even number of cylinders. 
What ever cylinder is firing the opposite cylinder in the firing order, is 
at overlap. Volkswagen firing order 1432, #1 and #3,    #2 and #4. etc.





>Subject: Re: [T2] Timing question (1600cc)


>I always like to specify which stroke whenever I say TDC. For example, if
> you set the valve gaps for a cylinder at TDC on the exhaust stroke, you
> will have a mess. Valve gap must be set at TDC of the compression stroke.
> You can tell because on the compression stroke, both valves are closed, 
> and
> their gaps are open. ( and thus you can set the gap on both ).
>
> The two TDCs (compression and exhaust) for a cylinder are one full engine
> rotation apart, but at any given TDC on the timing wheel, one of your
> cylinders is at TDC of the compression stroke, I always look at the
> distributor rotor to see which one it is. Alternatively, If you get
> somebody to turn the engine slowly, while you watch the valves of a
> cylinder, then TDC of the compression stroke comes right after the intake
> valve opens-then closes.