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  OT: General engine question.

 OT: General engine question.



I am in the middle of changing the timing belt on my AWD-type 2000 1.8T. Everything is going fine but I need a little help. All VAG 1.8Ts are interference type engines.

Before I removed the old timing belt, I aligned the mark on the camshaft sprocket with the mark on the valve cover. I marked that point on the belt. I also made 2 marks on the crankshaft sprocket and the belt. I figured regardless of cam and crankshaft position, I would count teeth and put the new belt on with the same marks and the same number of teeth. Then I removed the belt.

A few hours later I counted out the teeth and put the new belt on. Both belts have 150 teeth total. After wrestling with the belt for a while and finally getting it on, I was one tooth off. After a few iterations of putting the belt on and off (which fits very tight, even with the tensioner defeated), I am many teeth off.

So I go back to VW and Bentley manuals. Bentley says start with the crankshaft NOT at TDC. Then align the camshaft sprocket mark with the mark on the valve cover. Here is my question (finally): When I crank on the camshaft sprocket, it is difficult to turn. Very difficult. And I don't want to break anything. How difficult should it be to turn cams??? When trying to get the belt in place during previous attempts, I did come to what felt like a hard stop. But I stopped cranking. I did not force anything. I'm nervous I already bent something, but I am probably overreacting. (I hope).

I thought I would ask before I just muscled the camshaft sprocket.

Hard to turn:

What direction is the right way to crank this?

The waterpump impeller was in pieces (same plastic as BMW) when I removed it by the way:

New waterpump is metal.
   Reply » OT: General engine question.

potentially a valve is hitting a piston depending on the crank position

   Reply » OT: General engine question.

Quote:
potentially a valve is hitting a piston depending on the crank position
Yeah, that's why I asked.

This morning I turned the camshaft sprocket after making sure the crank was not at TDC. No problems. I was just nervous about the torque and (what I assume is) the feel of the cam lobes turning.

Now I have to get the damn belt on.

   Reply » OT: General engine question.

Sorry Jon, I have no ohc/belt experience to offer, but just wanted to mention the fact that at least you shouldn't be getting your hands dirty. That must be the cleanest VW engine compartment I've ever seen!

I did change the timing belt on a couple of Toyotas back in the 80's (non-interference) but don't remember too many details. One of them was a result of the timing belt breaking on me during a work trip to New Orleans (cheapass company car).

   Reply » OT: General engine question.

I just did a dodge 2.5 engine and same thing, the cam pulley was damn near impossible to turn even with a wrench, all those springs add up to some serious back force,
im sure its the same with yours, you should be ok

   Reply » OT: General engine question.

Everything is back together and working perfectly. The car *seemed* to click a little at idle, but I think it was either in my head or just because the car has been sitting for 2 days. BMW Motorcycle valve adjustments are the same deal. All operations normal. No fault codes on the VAG COM tool, no change in performance.

A few pics for fun... not perfect quality, but you get the idea. Some appear out of alignment, but that was because of my poor camera skills and the angles. When I pulled the pin on the tensioner, it moved the belt alignment a little, but less than 1 tooth.

Crank:


Cam:


Flywheel:


A few notes (I copied and pasted this text from my post on VWVortex):
1. The "count the teeth" method is fine for installing a timing belt, unless you move either the crank or the cam sprockets (which you should not do anyway!). If you do mark the belt and count teeth, do not expect the marks to be in the same spot each revolution unless by some miracle you put marks 75 teeth apart exactly. The cam sprocket on AWD's is 52 teeth. The crank sprocket is 26 teeth. If you mark some odd ball number of teeth, the math will not work out. I was expecting them to match every 2 revolutions and they didn't. I probably had everything perfect the first time and all of this was a total overreaction.

2. The motor mount can be a pain. Like others, I would be tempted to leave it dangling in place next time. I wasted a lot of time and effort wrestling with it.

3. The learning curve is fairly steep on this. I could do all this work again much quicker and easier. If any Bimmerfest members do a timing belt job on a VAG 1.8T, I would be happy to help over the phone in advance.


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