Is this TDC on the flywheel?

[drshoebocks]

I'm going through the injection pump timing procedure for the first time and I am not sure if the marks I am looking at are the correct mark for TDC or not. 



Is it the mark between the 2 and the 0?

[8v-of-fury]

Hmm, looks a little different from when I did mine. Sorry for the cell phone picture.


(Gave it a shot of red spray paint so I would know where it is next time around)

MY flywheels on both my 91 and 81 were identical to this picture. This is a picture of the 91.

http://vincewaldon.com/index.php?option=com_content&task=view&id=24&Itemid=28

How I learned how to do it, and a beauty writeup at that.

[Rabbit on Roids]

TDC should almost always be right above and to the left of one of the middle bolts in the flywheel. (if you are looking at it from the trans/drivers side. unless you have a flywheel with only 6 bolts holding it on, then it will be right above and to the left of where it looks like there should be a bolt. looks like your flywheel has a zero on it, that is the TDC mark usually, at 0* after or before TDC.

also, a little finger nail polish works great to mark TDC, plus, you dont get spray paint all over all your bell housing and crap that way. you just reach in there with the little brush, and pretty much fill up the TDC notch with paint.

[drshoebocks]

Got it
I went a little further and then there was another 0 with the diamond, this also had the lobes for #1 cylinder up.  When I went to put the locking plate on I had to rotate just a bit so I am actually of tdc just a bit.  The procedure I am following says I need to loosen the cam shaft and align the two.  Now I'm looking up the method of doing this.  Slow but sure progress is happening. 

[the caveman]

If he car ran fine before, then just before you loosen everything , find TDC on the flywheel by looking at what mark you have when the cam and pump at exactly at their respective TDC. BTW it looks like you have a gasser flywheel so you may have to triple check by removing #1 injector and using some way of measuring it.

[Vincent Waldon]

BTW it looks like you have a gasser flywheel

I'd agree. 

[rabbitman]

My flywheel looks just like his, tdc is a 0 with a line by it. I ordered mine for a diesel so I assumed it was the "new" way of marking it.......I've also verified tdc by sticking a screwdriver down the injector hole.

[truckinwagen]

the one on mine looks just like that too, but the numbers seem to have no relation to anything.

TDC on mine reads somewhere around the "3"

I made a new mark on it for TDC, but I had the head off.

[motomike33y]

What is that at the right side of your picture that looks like a finger coming out from the flywheel?  That may be what is TDC(or I've thought it was) on one of my diesels.  Can't see it clearly from the pic.

[Rabbit on Roids]

still looks like a gasser flywheel to me. all mine only have one timing mark, and my digi wheel on my diesel has 2.

[drshoebocks]

I definitely found TDC on the fly wheel, it was pretty obvious once I got there, and the lobes for #1` cylinder are up.  When I went to put the cam shaft lock I had to rotate a tiny bit and it is no longer exactly at tdc on the fly wheel.  I am following Vincents write up, which is very good by the way.  I built a sprocket locking tool and I am able to loosen the sprocket bolt, but I am unclear how to actually loosen the cam shaft.  I am being a little cautious, but being my first time to this particular show, I want to make sure to get it right.  Any advice on loosening the cam shaft, and beyond that, how do I get engaged again after I align everything?  Any and all tips are greatly appreciated. 

[the caveman]

Once you realize the trick, you will want all engines to have a cam gear like a VW diesel.  Follow Vincents instructions and as for the cam gear , you can take it off almost completely . That makes it easy to get the belt on the gear, while keeping everything else lined up. Once the belt is on, you can slowly push it further onto the wedge while looking to make sure the rest of the pulleys are at TDC. Super easy.

[Vincent Waldon]

as for the cam gear , you can take it off almost completely . That makes it easy to get the belt on the gear, while keeping everything else lined up.

Yup, that's how I do it as well... I take the cam sprocket right off... and then it's the last thing to go back on with the new belt... the taper on the shaft gives the belt enough slack to make it easy to pull everything into place.

[drshoebocks]

Thanks for the replies.  I will go ahead and knock the sprocket off or almost off.  I have a rubber mallet around here somewhere. 

[drshoebocks]

I figure since I have come this far, I might as well keep documenting.  I was easily able to disengage the cam shaft sprocket and get the fly wheel lined up with cam shaft tdc cylinder #1.  I went to put in the locking pin for the injection pump and sure enough it wasn't lined up.  I loosened the tensioner and the cam shaft sprocket, moved the belt over about 2 teeth and got the pump locked.  I am going to now move forward with Vincents procedure and time the pump. 

The reason I started this whole process was a no start, er, a no idle.  I can start it and give a bunch of throttle.  It smokes like hell and won't idle.  I have a feeling being out of time a tooth or two is the issue, but I am still learning, so this is simple speculation.