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Main : Misc The other end [Busted rod]

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The other end [Busted rod]
The other end [Busted rod]Popular
SubmitterDodgemanMore Photos from Dodgeman   Last Update2004/7/23 15:18    Tell a friendTell a friend
Hits1863  Comments8    0.00 (0 votes)0.00 (0 votes)
Considering the damage elsewhere, this part is in pretty good shape.

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
Dodgeman
Posted: 2004/7/23 15:15  Updated: 2004/7/23 15:15
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: The other end
If this rod had been lightened, just a little, by following the process outlined in the factory manual [see other photo], then there is every reason to believe that this engine would be alive today.

Polishing the beams removes surface irregularities that can be the source of these fatigue cracks. If there are any surface scratches remaining, created by the polishing process, they should be "along" the beam, which is OK, it's the ones that are across the beam that cause the real grief.

Poster Thread
Dodgeman
Posted: 2004/7/21 13:24  Updated: 2004/7/21 13:24
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: The other end
Does that look like a fatigue crack to you?

Poster Thread
who_your_datty_1200
Posted: 2004/7/21 13:29  Updated: 2004/7/21 13:29
No life (a.k.a. DattoMaster)
Joined: 2004/2/26
From:
Posts: 1440
 Re: The other end
that would be the smooth part rite??

Poster Thread
Dodgeman
Posted: 2004/7/21 13:33  Updated: 2004/7/21 13:33
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: The other end
None of it is actually "smooth" but there are two distinct colours & a very obvious line between them. Perhaps i should have a real good look at the real thing tomorrow.

Poster Thread
who_your_datty_1200
Posted: 2004/7/21 13:44  Updated: 2004/7/21 13:44
No life (a.k.a. DattoMaster)
Joined: 2004/2/26
From:
Posts: 1440
 Re: The other end
I see what you mean now, very distinct line, just had to open my eyes a bit wider.

Poster Thread
feral
Posted: 2004/7/21 14:04  Updated: 2004/7/21 14:04
Home away from home
Joined: 2002/5/1
From: Millgrove Vic OZ
Posts: 985
 Re: The other end
The left side centre of the rod has a discoloured area that was originally a small corroded area or bump on the surface. I reckon this has been a stress raiser and started the rod cracking here. It eventually opened up the crack over time till it reached the right side straight line where it had little support left and it opened with a bang.

If any one is interested in this sort of stuff, Caterpillar have a very good course in failure analysis for their diesel engines. It applies to small petrol engines equally as well I think.

This is an example of why race engines used polished beams and shot peened rods.

Poster Thread
woodydat
Posted: 2004/7/21 14:52  Updated: 2004/7/21 14:52
Home away from home
Joined: 2004/1/29
From:
Posts: 966
 Re: The other end
wat does shot peenin do and wat does polishing do..i thought it made the rod stronger

Poster Thread
holeshot
Posted: 2004/7/23 11:12  Updated: 2004/7/23 11:12
Home away from home
Joined: 2003/4/29
From: GOLD COAST AUZ
Posts: 360
 Re: The other end
YEP that is a stress crack.Makes you think a bit harder about lighting rods.