Valve adjustment crankshaft pulley one mark

[83stef]

my crankshaft pulley has only one mark !!!!????



I do not have markers 120 °....
is there a simple solution for Valve adjustement ??? I'm not a mechanic


many thanks (sorry for my English)
stef

[fasterlaster]

I don't know if this is the case, but double check there really isn't extra marks at the other positions.when I adjusted my valves for the first time it was very hard to find the marks bit they were there.

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[K Sykes]

That actually looks like one of the 120 marks. That pulley should have a similar notch on with Z1 written just below it. They can get really hard to see with crud build-up over time. A real bright light at an shallow angle to the face of the pulley can help. You can also use the rotor to get close enough to find the mark. There is a mark on the distributor that show's Z1, need to remove the dust cover under the rotor and then replace the rotor.

[83stef]

I have no other markers have with the good check ...

ok I'll look at the rotor on the distributor, many thanks

stef

[boyt911sc]

What car/model/year do you have? Keep us posted.

Tony

[83stef]

Originally Posted by boyt911sc

What car/model/year do you have? Keep us posted.

Tony

Dear Tony, Is this Porsche carrera 3.2 year 1986 gear 915... red indiana

[911pcars]

If that is indeed your TDC mark, how do you adjust timing? The factory pulley will have, as K Sykes mentioned, a Z1 stamp as well as various marks for setting static timing. You might have a generic pulley w/o timing marks for your MY Pcar.

For valve adjustment purposes, observing the rotor firing position on the cap is one method to confirm the valves to adjust are closed and the piston is at TDC.

FYI, a couple more ways:
1. Reference marks on pulley
Assuming the mark on the pulley is TDC, that indicates TDC for two cylinders, no. 1 and 4 (one piston is at end of compression, the other is at end of exhaust); same with the other paired cylinders in the firing order: 162435 (1 and 4, 6 and 3, 2 and 5), or:
1 6 2
4 3 5............. works for any 4-stroke cycle firing order

With a perm. marker, add ref. marks on the pulley 120º apart (3 total). If beginning at no. 1 @ TDC, valves are closed (rotor should point to no. 1 on cap), adjust them. Then rotate the pulley 1/3 CW so the next mark is opposite the crank split mark. That is TDC for cylinders 6 and 3, but only #6 has both valves closed. Check/adjust #6 valves. Continue rotating the pulley 1/3 rev. and adjust those cylinder valves in the firing order sequence.

Nice to know:
a. All 4-stroke cycle cylinders fire evenly spaced within 2 revs of the pulley (crankshaft).
b. Distributor rotates at 1/2 speed of crank.
c. When a rocker arm contacts the heel area of the lobe (low point), that valve is closed. One can confirm by rocking the rocker arm and feel for clearance between rocker and cam/valve. Once confirmed, check/adjust the valve clearance.
d. Adjust valve clearance when the engine is dead cold (e.g. a day after draining the oil).

2. Observe rocker clearance
I suggest this method when adjusting the exhaust valves (behind the lower valve covers). In this way, you avoid having to observe the pulley - just rotate engine and observe the rockers, then adjust. In addition, this reduces the trips back and forth between under the engine and on top to manually rotate the pulley. How to rotate?

Install a remote starter switch on the starter solenoid and bump the engine around until the desired rocker is in position (Ign. OFF). Repeat as necessary. Keep track of valves adjusted and you're done. To save time, perform all valve adjustments on one side of the engine, then do all the valves on the other

Hope this isn't too confusing and instead helps,
Sherwood

[yelcab1]

Originally Posted by 911pcars

If that is indeed your TDC mark, how do you adjust timing?
Sherwood

you don't adjust timing on a 3.2L engine with DME engine management.

[Dr J]

If no other marks, you can make your own. Measure the diameter and divide by two to get the radius r.

To get another mark, you can measure along the circumference a distance of r x 120 * pi/180

You can cut a piece of paper or something to that length and then wrap it around the circumference from the first mark and it will show you the second mark 120 degrees away. You can repeat from this mark and get the next 120 degrees.

Can also mark a piece of tape and tape it and use a file to make the mark. In this case, the tape can be longer and you just file through the mark to the metal beneath.

[83stef]

hé Dr J thank you... your idea looks simple I'll try

[bazar01]

All you really need is the Z1 and the distributor rotor position. Just mark the plug wire number and position along the perimeter of the distributor metal rim where the cap sits following the firing order 1-6-2-4-3-5. Remove the distributor cap. Rotate the crank clockwise and stop when distributor rotor is pointing to #1 spark plug mark and crank pulley at the mark. Then adjust the valve clearance. To do cylinder #6, rotate the crank pulley again until the rotor is pointing to #6. You have to use the same middle point on the rotor for reference when doing the rest of the valve adjustments.

Rotor Position Degrees
rotor on 1 - 0 and Z1 mark
rotor on 6 - 120
rotor on 2 - 240
rotor on 4 - 360/0 and Z1 mark
rotor on 3 - 120
rotor on 5 - 240

[hank911]

Great post,

Been adjusting my 911SC & 914 valves for years.
Just got a 1971T and the crank pulley was grungy and VERY lightly marked.
I like using white nail polish on the 120's if like this one, not well marked.
Now this is very important. If married make SURE your wife gives you one of
her old nail polish's , less you risk the wrath of just sneaking one out of her stash.
THEY KNOW!

[hank911]

Also,
I must be in the minority as I don't do one bank then the other I do the opposing pairs,
1-4
6-3
2-5
Whatever makes you happy.
Remember your old Vdub days with the KOOL pulley dials with all 360 degrees?

Kool!

[vngufmxw]

this reduces the trips back and forth between under the engine and on top to manually rotate the pulley.

[911pcars]

Originally Posted by yelcab1

you don't adjust timing on a 3.2L engine with DME engine management.

I guess some cranks just have one mark or 3 equally spaced marks? FWIW, my 3.2 crank has Z1 and timing marks/nos. on it. With only 3 marks on the pulley, one would need a timing light with an advance knob to confirm ignition advance or possess much tuning faith.

Sherwood

[83stef]

ok , news pictures :
when the rotor face this marker on the distributor :


and this the face of the pulley in the position :


what else ?