WBX-Unknown

Big lumps of metals and spanners. Including servicing and fluids.

Moderators: User administrators, Moderators

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

I have finally found the specs for the one piece main bearing :D I knew it would be somewhere on the internet

After searching for bearing specs for KS, Mahle and Glyco I decided to use VW classic to see if the information was there. It was, but the data was a little too rounded for my liking, but I now had part numbers rather than NLA

One piece bearing https://www.volkswagen-classic-parts.de ... 82d97.html "26" mm

Three piece bearing https://www.volkswagen-classic-parts.de ... b7f4e.html "20" mm excluding thrust washers. We already knew this was 19.8mm

I then dropped the part number into a site that had popped up before, though these are oversize, the bearing length remains the same at 25.96mm https://e-shop.eoltas.lt/en/74181630-KOLBENSCHMIDT/

So my one piece bearing has worn 0.07mm while itchys had only worn 0.04mm. I'm happy now that I will be able to get the endfloat back into spec and not have to use three maximum thickness shims :ok

I still want to figure out why there is a dimension difference between the two bearings, but that's just satisfying my intellectual curiosity. My technical German has improved again :)
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

Sorry my untrained eye does not see anything wrong where am I looking?

937carrera wrote:Con rod first. Remember axial play at 0.4mm is within spec so that isn't causing the side load

Image

1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

Look at the shell between about 11 o clock and 1 o clock. There's a dark curved line with a lighter colour to the shell above, compared to the rest of the shell.

That's where the bearing is more polished & worn, and where the additional side play at the small end is coming from.
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

oh hes I see that now thought it was a relflecton.
is that typical of a bent rod then?
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

Maybe...

Typical would see the same wear on the diagonally opposite shell, which there isn't.

I think I need to take a closer look at the little end of that piston / con rod and see if there is any sign of uneven wear there
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

checked piston/rod/ pin weights?
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

No, not yet, a bent rod weighs the same as a straight one.......Or are you thinking a heavy piston causing torsional stresses on the crank.

It's very difficult to bend a crank and type 4 / WBX ones are pretty strong
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

No I was just stabbing in the dark, perhaps an unbalanced piston/rod/pin can cause wear if you found that one was different you might do some more research on it.

Remind me it's not reground is it, wasn't there talk of grinding marks on that journal, can't remember?
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

The journal specs were a couple of pages ago, the crank is completely standard, almost as new except for main number 4, couple of minor marks on rod number 2 cylinder which I'm OK with now

I put the spec sheet up a couple of pages ago, you must have been enjoying your hols that day :lol:

Image
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

937carrera wrote:
I put the spec sheet up a couple of pages ago, you must have been enjoying your hols that day :lol:



yep on me holls and on a mobile, I may have mentioned that the pics are slow to load so all you see is the text for about 15 minuites if you can even be bothered to wait that long :D
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
937carrera
Registered user
Posts: 3599
Joined: 05 Apr 2015, 19:29
80-90 Mem No: 16333
Location: N Yorks.

Re: WBX-Unknown

Post by 937carrera »

Sorry about that, here's another....

Early case alternator bracket

Image

I've just weighed the rotating assemblies, set out as rod + piston, rod being rod+ shell bearings, piston being piston+gudgeon pin+1 circlip:

1. 569+549 = 1118
2. 568+546 = 1115
3. 567+549 = 1114
4. 567+551 = 1118

They look pretty good, but the kitchen scales I used aren't giving consistent results, so these values were the result of a number of weighings, being sure to repeat the positioning on the scale. :shock: They are all as pulled from the case, no cleaning, so this was the actual rotating mass, ignoring oil in the rod.
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

Its not that then.
Personally I wouldn't worry as you are fitting new shells
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

937carrera wrote:
I still want to figure out why there is a dimension difference between the two bearings, but that's just satisfying my intellectual curiosity.

I know :D
The answer is staring you in the face, let's see if you can work it out before I can get into the shed and get the money shot.
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
itchyfeet
Registered user
Posts: 12427
Joined: 23 Jul 2007, 17:24
80-90 Mem No: 12733
Location: South Hampshire

Re: WBX-Unknown

Post by itchyfeet »

The answer is they are not different they can't be, it's the assumption that the thrust washers touch the bearing thats wrong, they don't they are held clear by the casing.

ImageP1100438 by Paul_Barr, on Flickr
1988 DG WBX LPG Tin Top
1989 DJ digijet WBX Holdsworth Villa 3 Pop Top
itchylinks

User avatar
bigbadbob76
Registered user
Posts: 1733
Joined: 07 Nov 2016, 14:41
80-90 Mem No: 15707
Location: Isle of Skye

Re: WBX-Unknown

Post by bigbadbob76 »

Doh! :rofl :rofl
Obvious now aint it.
'86 1.9 DG, 4 spd, tintop, camper conversion.
Split case club member.

Post Reply