[Vwdiesel] Why #3
James Hansen
jhsg at sasktel.net
Fri Sep 9 02:13:08 EDT 2005
I have a parts 1.9td here with a broken crank.
Well, almost broken.
It's cracked through # 3 rod journal.
There's a story that goes with it too.... Girl owns car. Boy wishes to
impress girl with manly car talent, so he replaces clutch for her. Girl has
misfortune to have bad taste in men- she is hanging out with a ford boy.
Ford boy fails to tighten clutch bolts to spec. or use any loctite.. Clutch
vibrates off.... in small steps. girl has misfortune of continuing to drive
car until flywheel parts off the transmission at the bell housing. Upon
inspection, the vibration from the flywheel machining the bellhousing seem
to have been centered on the area just immediately beside # 3 rod journal,
and the crank is cracked through. It ran like this with some tenuous metal
bits holding it together for the last few klicks to a real shop sans ford
boys, but I would have to side with the Miser in that the vibrational
stresses could very well have a locus near the third rod journal. Some
locus focus hocus pocus... more vibration on the vanagon because of higher
rpm, or some freaky harmonic...
-James
-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
Behalf Of LBaird119 at aol.com
Sent: Wednesday, September 07, 2005 9:39 PM
To: vwdiesel at audifans.com
Subject: Re: [Vwdiesel] Why #3
In a message dated 9/7/2005 4:12:53 PM Pacific Standard Time,
Libbybapa at wmconnect.com writes:
> It is limited to the n/a diesel vanagons. It is at the big end.
Used to see a few R/J/D/Q that did similar. Usually didn't throw the rod
as they were probably more audible to the typical driver than in the back
of a Vanagon. I have one crank that had gone in a block I bought and I
believe it was #3. A couple others I'd heard of seemed they were on the
"far end" of the crank as well. These were back in the early days of the
VW diesels and from the looks of the bearings and crank in mine it was
from less than ideal oil and changes.
If you look at a Subaru crank you'll see main bearings about the size of
VW rods and rods that your young'un can reach thumb and finger around.
They put out much more hp and even torque than a 1.6 NA and they don't
throw.
I don't think I've ever heard of a crank actually breaking on a VW diesel,
which is more what we'd attribute to stress loading of the last journal than
a "Chevy" rod instance.
Loren
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