« previous next »
Pages: [1]

Author Topic: IDI main bearing cap failure  (Read 5813 times)

April 27, 2007, 09:03:23 am

diesel_head

  • Newbie
  • Offline
  • *
  • 3
IDI main bearing cap failure
« on: April 27, 2007, 09:03:23 am »
How common is it to break a main bearing cap when running 27 psi of boost? :(

Thanks
Logged
Reply #1April 27, 2007, 02:48:57 pm

HarryMann

  • Junior
  • Offline
  • **
  • 170
IDI main bearing cap failure
« Reply #1 on: April 27, 2007, 02:48:57 pm »
Heard of two running less than that in the UK, one bolt and one a cap... the cap one, running std boost on a refurb engine about 2 years old. The other a bolt running 20psi or so and went when cruising at low boost.

What length bolts are yours - the M10x 65mm or the AM10x80's ?
Logged
Reply #2April 27, 2007, 03:24:25 pm

diesel_head

  • Newbie
  • Offline
  • *
  • 3
IDI main bearing cap failure
« Reply #2 on: April 27, 2007, 03:24:25 pm »
Not sure what bolts I have.

I saw a post on here where a guy made up what looked like 3/4 by 3/4 inch bars that go under the caps for more support. does anyone know where that thread is?
Logged
Reply #3April 27, 2007, 03:35:54 pm

HarryMann

  • Junior
  • Offline
  • **
  • 170
IDI main bearing cap failure
« Reply #3 on: April 27, 2007, 03:35:54 pm »
No, been looking as we are getting a bit nervous here  :D

The std. boost engine with the broken cap, I now have. Owner repaired hole in block with plastic metal (nice) and put the broken cap back on with a steel bar over the top, and then drove it for quite a while, nervously and not too fast - just fine :roll:

The steel reinforcing bars remind me of the Ford  tuners in the 60's and 70's who made a habit of doing this on the 1300's and 1600's over here... keep looking for that thread and let us know here if you find it!

Another UK VW GTD poster says that the longer main bolts are for a thicker cap, presumably later engines. But because the caps come line-bored as part of the short-engine and not separately, ETKA doesn't show a specific part nunber for the caps alone...

Many thanks for your post, but you haven't said what happened to yours - exactly  :)
Logged
Reply #4April 27, 2007, 07:20:08 pm

craiggroombridge

  • User+
  • Offline
  • *
  • 38
IDI main bearing cap failure
« Reply #4 on: April 27, 2007, 07:20:08 pm »
what you are describing is a main girdle for the bottom end easy to make with the right tools and makes the bottom end a lot more stable
Logged
My first was an 85 gas fun
my second is an 86 gas more fun
my third is a 92 n/a diesel project
Reply #5April 27, 2007, 07:53:16 pm

jtanguay

  • Veteran
  • Offline
  • ***
  • 6879
IDI main bearing cap failure
« Reply #5 on: April 27, 2007, 07:53:16 pm »
Logged


This is how we deal with porn spammers! You've been warned.
Reply #6April 30, 2007, 08:07:35 am

diesel_head

  • Newbie
  • Offline
  • *
  • 3
IDI main bearing cap failure
« Reply #6 on: April 30, 2007, 08:07:35 am »
That's a cool, but alot of work.

What I saw and I'm pretty sure it was on this site was a pic of a broken main cap and he pugraded it with a steel bar and longer bolts.

Thanks

DH
Logged
Reply #7April 30, 2007, 07:57:19 pm

itzdshtz

  • Junior
  • Offline
  • **
  • 94
IDI main bearing cap failure
« Reply #7 on: April 30, 2007, 07:57:19 pm »
I think you were looking for a picture from Audi 80.

Quote from: Audi80
It was 5 cylider 2,4D with 80mm bolts (5 cylinder aaz) It was a little modified,  but not much ~140whp. No more cracked caps: pic  :wink: Used 12.9 allen head bolts.
Logged
1989 Vanagon Westfalia 2.1
1987 Vanagon Syncro Westfalia 2.0 TD
2004 Audi allroad 4.2
1997 Audi A6
1985 Audi 5000 Td
http://vanagonsyncroproject-herman.blogspot.com/
http://picasaweb.google.com/itzdshtz/VanagonSyncroProject02
Reply #8April 30, 2007, 08:16:08 pm

vwmike

  • Authorized Vendor
  • Veteran
  • Offline
  • ***
  • 1158
IDI main bearing cap failure
« Reply #8 on: April 30, 2007, 08:16:08 pm »
Logged
Reply #9May 01, 2007, 11:48:13 am

Audi80

  • Guest
IDI main bearing cap failure
« Reply #9 on: May 01, 2007, 11:48:13 am »
:shock:  Anyone used that? This is pretty much same thing I have worked for my engine... :roll:
Logged
Reply #10May 01, 2007, 04:28:15 pm

foxracer1

  • Authorized Vendor
  • Veteran
  • Offline
  • ***
  • 991
IDI main bearing cap failure
« Reply #10 on: May 01, 2007, 04:28:15 pm »
Logged
84 4dr Rabbit 1.6 N/A sold to friend
86 Jetta TD getting raced out AHU 02A
98 Jetta TDI Malone tune stg 3
91 S10 305 TPI T56
86 S10 2WD Prerunner project.


Now offering turbo rebuilds. HP or stock. Any turbo you have i can rebuild it for ya.
Reseal injection pumps PM for det
Reply #11May 03, 2007, 09:57:59 pm

craiggroombridge

  • User+
  • Offline
  • *
  • 38
IDI main bearing cap failure
« Reply #11 on: May 03, 2007, 09:57:59 pm »
$400 that is cheap for a bottom end that won't shift and brake things how much dose a 1.6 td sell for now a days with the current price of fuel
Logged
My first was an 85 gas fun
my second is an 86 gas more fun
my third is a 92 n/a diesel project
Pages: [1]
« previous next »