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Author Topic: Snapped main bearing bolts  (Read 3461 times)

April 15, 2007, 03:21:48 pm

andysimpson

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Snapped main bearing bolts
« on: April 15, 2007, 03:21:48 pm »
My AAZ has broken 2 of its main bearing bolts resulting in a totallt dead engine. Its an early AAZ with the short bolts, i have a replacement engine with the long bolts, i assumed the long bolts were because the main bearing caps had been modified which they have not. I know of another AAZ which has done a similar thing are there any others out there?

Does anyone know of an uprated bolt or cause?

The other one was standard as far as i know, mine is very modified in a vanagon syncro so working hard.

I just don't want a repeat of this.
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Reply #1April 15, 2007, 03:45:45 pm

Wingaman

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Snapped main bearing bolts
« Reply #1 on: April 15, 2007, 03:45:45 pm »
It's the first time I heard this  :shock:
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DMF Diesel Enr. - 514-659-3041 - Spécialisation VW IDI/TDI ainsi que pompe à injection.
371-B, Ch. Ste-Marie
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Reply #2April 15, 2007, 03:58:40 pm

Audi80

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Snapped main bearing bolts
« Reply #2 on: April 15, 2007, 03:58:40 pm »
Does this look familiar?

Kilck
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Reply #3April 15, 2007, 04:00:37 pm

Wingaman

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Snapped main bearing bolts
« Reply #3 on: April 15, 2007, 04:00:37 pm »
Holy***  :shock:
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DMF Diesel Enr. - 514-659-3041 - Spécialisation VW IDI/TDI ainsi que pompe à injection.
371-B, Ch. Ste-Marie
Ste-Marthe QC J0P 1W0
Reply #4April 15, 2007, 04:07:50 pm

andysimpson

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Snapped main bearing bolts
« Reply #4 on: April 15, 2007, 04:07:50 pm »
Quote from: Audi80
Does this look familiar?

Kilck


Yes just like that and then broken bits had a fight with a piston and con rod. Do you know what year engine was or the number the bolts chnaged at 560001 early 94. Mine had a different bolt, your has a shoulder mine was fully threaded. Engine standard or modified?

How many more?????

Have looked at the ARP catalogue but can only find early main bolts listed (65mm ones) i need the 80mm ones.
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Reply #5April 15, 2007, 04:23:24 pm

Audi80

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Snapped main bearing bolts
« Reply #5 on: April 15, 2007, 04:23:24 pm »
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.
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Reply #6April 15, 2007, 04:41:22 pm

andysimpson

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Snapped main bearing bolts
« Reply #6 on: April 15, 2007, 04:41:22 pm »
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.


Just looked up the part number for the 5 pot bolts its the same as the late AAZ's. I have been thinking about 12.9 bolts, there 10.9 standard. I have also thought about braces under the caps, will have a look tommorow if there is room.
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Reply #7April 16, 2007, 06:21:11 pm

935racer

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Snapped main bearing bolts
« Reply #7 on: April 16, 2007, 06:21:11 pm »
Good grief what are you guys doing to these things? :shock:  I've never had any main cap or bolts failure issues one these things.

Now crank sprocket/nose failure and the mains being round after such a failure is another story...
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Reply #8April 17, 2007, 01:56:14 am

Audi80

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Snapped main bearing bolts
« Reply #8 on: April 17, 2007, 01:56:14 am »
I´ve heard of many cases, it´s not that rare :? Can´t say what causes it, but that 2,4 did have broken piston (between rings) and that cracked main cap. Luckily nothing else did broke.

When I started to build my 1,6, the reinforcement bar was the first thing my machinist told me to do :roll:
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