Author Topic: 1.6 Crank Trust Bearing Woes (Read 5346 times)

monomer · « **on:** November 04, 2008, 12:46:55 pm »

I drop my shortblock off at my local Machine shop. This is they're (and mine) first VW diesel block.

a week later, I get a call. They want to re-weld and grind the "gash" in the thrust bearing area. It's a Diesel crank, not a 350SB here - no welding for me. I find one and order it off the samba.

I dropped it off today. This is the first time I see said "gash" I note the fact that the snub on the new crank is the wrong one (from an auto...) But the Thrust areas are nearly exactly the same.

Pics:

(sorry for the poor quality, didn't have my digital on me when I dropped it off - only my phone)

The "Gash" looks to be an oiling groove to me. Anyone?

myke_w · « **Reply #1 on:** November 04, 2008, 12:57:07 pm »

Very difficult to see in those pics if you have better ones that would be ideal for figuring this out

monomer · « **Reply #2 on:** November 04, 2008, 06:53:24 pm »

the groove is roughly .030 deep, on the inside.

both cranks have the same exact groove, one cranks from an auto, ones from a manual.

the groove looks to be turned in. It shows no signs of overheating/discoloration

I'll try to get more pics tomorrow.

monomer · « **Reply #3 on:** November 08, 2008, 11:05:09 am »

new pics turned out the same

macro on my camera seems to do nothing.

No-one has had one of these apart?

burn_your_money · « **Reply #4 on:** November 08, 2008, 12:55:18 pm »

What motor is this for?

fatmobile · « **Reply #5 on:** November 08, 2008, 06:49:53 pm »

What kind/brand of bearings were on it?

monomer · « **Reply #6 on:** November 09, 2008, 06:58:36 pm »

Quote from: "fatmobile"

What kind/brand of bearings were on it?

no idea. I'd say stock.

This is a 1.6 Diesel (1983 rabbit 5 speed)

anyone have one of these apart? Recall what it looked like?

Vincent Waldon · « **Reply #7 on:** November 09, 2008, 07:34:05 pm »

I think we're all going to draw a blank until we can see clear pictures of the damage ?

monomer · « **Reply #8 on:** November 09, 2008, 08:11:02 pm »

Quote from: "Vincent Waldon"

I think we're all going to draw a blank until we can see clear pictures of the damage ?

Well, you see the rough dimensions of said groove. it's only on the one side. No annealing or discoloration the groove is .020-.030 deep on the inside (guessed by eye)

it's there, and in the same dimensions on both cranks.

pretty straightforward. I think it's an oiling groove, but this is my first build.

lord_verminaard · « **Reply #9 on:** November 10, 2008, 05:52:10 am »

Just had mine apart too, I'm pretty sure that groove was there, though I was in a hurry and didn't look too close. Make damn triple sure that the machine shop puts "proper" bearings back in it, a lot of cheap replacement bearings for early VW cranks are 2-piece with the thrust washer built in to the shell, those are junk. Make sure to get the 4-piece version and make sure they set up the thrust properly. If not, the crank will be trash after the first 20 times you push in the clutch. Many times you can re-use the thrust washer if neither the crank or the washer is worn.

Brendan

monomer · « **Reply #10 on:** November 10, 2008, 03:16:36 pm »

Quote from: "lord_verminaard"

Just had mine apart too, I'm pretty sure that groove was there, though I was in a hurry and didn't look too close. Make damn triple sure that the machine shop puts "proper" bearings back in it, a lot of cheap replacement bearings for early VW cranks are 2-piece with the thrust washer built in to the shell, those are junk. Make sure to get the 4-piece version and make sure they set up the thrust properly. If not, the crank will be trash after the first 20 times you push in the clutch. Many times you can re-use the thrust washer if neither the crank or the washer is worn.

Brendan

I'm getting the full glyco deal from myke.

The shop is just boring/decking/resizing. I plan on having a trusted friend assemble the shortblock.

I

monomer · « **Reply #11 on:** November 13, 2008, 02:34:49 pm »

I know someone's had the bottom end apart......

this is holding me up.

jtanguay · « **Reply #12 on:** November 13, 2008, 03:11:47 pm »

theres pictures somewhere on this site of what the damage looks like... i just forget who's crank it was...

monomer · « **Reply #13 on:** November 14, 2008, 01:38:42 pm »

More pics:

zukgod1 · « **Reply #14 on:** November 14, 2008, 01:40:34 pm »

I'm pretty sure that's just supose to be a flat surface. no groves at all.