85 UR quattro

7 minute(s) of a 211 minute read

Some progress today. I removed the subframe and dragged it to one side of the shop:

Was going to split the block and transmission next but was thwarted by one wastegate bracket nut so decided to remove the intake and exhaust plumbing first.

Discovered a few issues of course. One is that almost every fastener I have removed so far seemed very loose. Is this normal? Also these:

What's this?

Broken connector on the diff lock actuator:

If I get time tomorrow I'll split the block and trans

7-31-2014

They're under starter's orders......

Ready............

Go!

YUK!

Not too bad

Clutch slave cylinder off. Replace?

Borrowed this to test fit. Will it fit?

Today I might get to power-wash everything and take off the clutch.

8-2-2014

Quite a bit of progress these past few days. I think this is the furthest this car has been from being drivable since before it was made!

Got the clutch off. What do you think?

Doesn't look that worn.

Bought some supplies and cleaned the sub-frame and box.

Got the flywheel off and mounted it on the engine stand.

Next, off with it's head!

8-3-2014

Got the head off. No problem with any fasteners or anything. Took me a while to figure out hoe to slacken the timing belt though. Never seen that before.

Here are some shots of the pistons and valves:

And the valves:

I filled the head with gasoline but couldn't see any leaking past the valves.

8-6-2014

So yesterday I did as suggested: flipped the head, filled the combustion chambers with gasoline and aimed compressed air at the valve seats from below. Results can be seen in this video.

As you can see, almost every cylinder has an issue. The worst is #1 though which is the one with bad compression. I think we'll be putting the new head on when we put this back all together.

I also did a similar thing with the piston rings. No compressed air though. I just poured some fuel into each to see if it leaked by fairly quickly. I have no benchmark for this test but in my opinion they leaked down very, very slowly. I'm thinking the pistons are OK but I need a better way to prove this before reassembly.

One thing I'm not sure about, how to remove the large pulley on the front also seems to be called "vibration damper". Big central nut or four Allen screws or all five? Any suggestion for stopping the crank rotating?

8-7-2014

This is scary.

How about locking the crank off the flywheel, like this?

The four Allen screws actually came out very easily.

So an air impact gun should free the center bolt up then? But I'll still need the tool to torque it back up when it's in the car?