question on crankshaft pulleys

[JBG3]

Just to be a worry guts, but the crankshaft isn't loose? Knackered thrust bearing wise?

Theres a front main seal leak, but it seems really tight otherwise.  After reading this, I tried to make extra sure, and it seems good.  Alarming thought!  

The crank pulley and water pump pulley are both tweaked slightly though, turn with a little wobble.  

I put a new belt on this car (turns out to be the correct model, original belt was too long), and it IMMEDIATELY started to eat the belt, less than 30 miles cooked a lot of the side of the belt, so I had to deal with it fast

-Little bits of melted belt-



about 1/8th off here in this picture from underneath-



I ended up using 6 cut flat washers and 3 new bolts that were longer to get it out further.  Turns out all the water pump pulleys on the parts engines are the same as this, so I took one of those off and will get a machine shop to rig up a legit spacer for me vs these washers, but this will work for now-




Lines up much better, but I should really replace both these pulleys, they both wobble pretty bad.  I tried to clock the wobble as best I could so one wouldn't be wobbling one way while the other was wobbling opposite and stretching the belt, but easier said than done.  

reinstalled-



Even with the wobble, its way better lined up vs wobbling and way off.  

Unfortunately, theres not much  I can do about the alternator pulley.  The nut is already right on the end of the threads, and trying to space it out 1/8th would expose too much of the nut, half of it would be off the threads.  Its still in about the same place the water pump originally was.  The distance away probably will work in my favor, does not seem to be cooking the belt anymore with a test run, but ill watch it to make sure.  

This is a weird problem to have, I can't believe all three of the 1.6 motors im sitting on all have the same problem!

[fatmobile]

There's a lock washer on the alternator pully,
 that can be removed.
 Put a spacer under the pully and use lock-tite on the nut.

[belchfire]

I think that some of your belt problems may be from your nasty pulleys. The rust and pits act as teeth and will chew up a belt in nothing flat. Seems to be a common problem. They're down so low that they are the first things to hit mud & debris. Mine would squeal horribly whenever I hit a puddle. I built a tin shield and it helps a lot.

[JBG3]

so I shot a video of the engine running so you all can see the wobble in action.  At idle, its pretty nasty looking, but once its at load, it calms down.

The belt is jumping around a lot related to the crank pulley, but also the crappy reman alternator in there, which has something broken inside after 3000 miles, and the bearings are also loosening up inside, some shaft play.  You can hear the rattle in the background, didn't pick up all that well with the camera, but its super loud.  Ive already pulled that and am giving the auto parts store the chance to make good and give me another one.

http://youtu.be/nL15KYzYyqg

[belchfire]

From your video, the alternator doesn't seem to be all that bad. The crank pulley is something else though. Looks like it got wanged at some point and wobbles pretty bad. A new one would be best but I suppose that you could try to un-wang it with a hammer. good luck.

[billybobf]

Hey, I was under the impression that the water pumps pully HUB was just pressed on? and that when ordering water pumps if you got stuck with the wrong one you could easily repair it with minimal tools? in his situation a three slot puller could fix the problem? just put the bolts through the puller threaded into the hub and push on the water pump shaft? this would have to be done with the water pump OFF the car? or possibly loosen some motor mounts and lower the water pump to below the frame?

[fatmobile]

The water pump pully comes off easily once the bolts are removed.

[billybobf]

I'm talking about moving the hub it bolts to

[bajacalal]

What with a press?

I don't see why though. The cars use the same pump, the pulleys are what's different. Some of the mk1 cars had a different pump but they were a different size hub too so the pulleys don't swap.

[JBG3]

maybe I whacked it when I was dropping the motor in.  Is a crank pulley something I can buy new?  I had assumed id have to get another one from a parts motor or some such. 

[belchfire]

Your pulleys look more like an archeological find than a machine part. E-bay might be a source. Hopefully you could find a WP one too. I'm sure that there are all kinds of mix & match applications so that'll be fun. Mine has a second sheave for power steering that's unused and runs with no problems. New? I don't know. Maybe Pelham auto parts for a start.

[JBG3]

so to follow up on this thread with some probably useful data.

I ultimately sold this car several thousand miles after this thread, maybe 5-10k?  She was driving around and apparently the crank pulley broke in half do to rust.  Right along the V section, the outboard side of the V fell off, and the belt flew off.  She ended up replacing the crank pulley, but worth mentioning what ultimately happened.