Cam Questions

[Trog]

Hi folks,

Can someone please answer a couple of questions for me.

1- What is this treaded component for, and why is it I don't see it in my reference manuals (see red arrow)?

2- Where would I find the TDC mark on the cam (930 or punch mark)?

Thx,

T...

[Mo_Gearhead]

The threaded 'pin' is used to set the cam timing. If you will note, there are inner sprockets with multiple holes behind the front chain sprocket. During cam timing, only one of those holes will be in position to insert the 'pin'.

If I understand your second question correctly, the mark should be on the cam 'face' ... AFTER you remove the large bolt and washer in your picture.

[slodave]

There is an unneeded tool that allows you to thread the pin onto, stick into the right hole and unscrew. I had no problem finding the right whole and popping the pin in with my fingers.

[shbop]

Once you have the bolt and washer off, unscrew the top of an old spark plug. You know have a custom tool for removing the pin. The spark-plug will thread right into the pin.

[2.7RACER]

I must ask, what are you trying to do?

[Trog]

Originally Posted by 2.7RACER

I must ask, what are you trying to do?

I opened up the left and right side cases to check out a potential failed chain tensioner.. and I figured while I'm in there, might as well check my timing.

[2.7RACER]

The photo shows a cam sprocket in excellent condition. It does not show whether the chain has worn or not. How do the plastic chain ramps look?
A quick check of cam timing would be to turn the engine clockwise to #1 cylinder TDC compression.
Remove the bolt and washer at the end of both cams. The markings will be visible and should be straight up and down.
If one of the chains jumped time the marks at the end of the cam will be noticably tilted.
Easily out of alignment. From what little I see it is likely in time.
For a more precise check of course will call for checking each side with a dial indicator.
That process is described very well in Waynes book and in threads in this forum.

[slodave]

If you remove the cam bolts, you will need to get a hand on the tool that loosens/tightens them. You can loosen the bolts without, but you cannot re-torque the bolts without it.

[T77911S]

like doug said above, if you suspect a cam timing problem, put a dial gage on it to check it, dont remove the cam nuts unless you have to adjust the timing.
i dont mean to insult you by saying this, if you dont know what the pin is, DO NOT remove the cam nut. get someone that has done it to help you. an experienced mechanic messed with mine (before i bought mine) and got them 15 degrees off. the reason i say experienced is because they were both set exactly the same. he also installed the cooling fins upside down. i think he just did not know about porsche's.
you need a big crows foot and special holder to remove and install the nut.

the pin is threaded for removal more so than for installation. i used a screw and pliers to remove mine.

[Trog]

Originally Posted by T77911S

like doug said above, if you suspect a cam timing problem, put a dial gage on it to check it, dont remove the cam nuts unless you have to adjust the timing.
i dont mean to insult you by saying this, if you dont know what the pin is, DO NOT remove the cam nut. get someone that has done it to help you. an experienced mechanic messed with mine (before i bought mine) and got them 15 degrees off. the reason i say experienced is because they were both set exactly the same. he also installed the cooling fins upside down. i think he just did not know about porsche's.
you need a big crows foot and special holder to remove and install the nut.

the pin is threaded for removal more so than for installation. i used a screw and pliers to remove mine.

Noted.