Re: someone needs qualified help : thrust bearing problem

["Brian Wagner" <scirocco_88_16v@hotmail.com>]

Dirk,

The thrust bearing he is talking about is actually the rear main bearing, on 
this bearing the surface wraps around the journal end cap.
Look at the attached picture the large bearing to the left, what this does 
is reduce the amount of crankshaft walk. Yes these will go bad after a 
period of time, just think about how many times you use your clutch a day 
when driving the car and the amount of force that is necessary to disengauge 
the clutch. All that force is transfered to that load area on the rear 
bearing , so is it common for a vehicle with 150K or poor maintainence to 
fail I would say yes. Also the amount of play he is talking about could 
cause other failures on the bottom end.

HTH

Brian

87 16v
86 8v (parts car)



>From: SCIROCCO2@t-online.de (Dirk Schneider)
>Reply-To: "Dirk Schneider" <Dirk@Scirocco2.de>
>To: <scirocco-l@scirocco.org>
>Subject: someone needs qualified help : thrust bearing problem
>Date: Thu, 11 Oct 2001 20:00:39 +0200
>
>Hello listers,
>I got a mail from a U.S. Scirocco driver asking for support.
>
>However, my english knowlewdge seems to be insufficient
>to help him here.
>
>Can somebody explain to me what a "thrust bearing"  is?
>he isn't talking of a motor-mount is he ?
>
>Could anybody answer this guy to help him please ?
>His address is DEREKSHIELDS@webtv.net
>and his name is Derek Shields.
>
>Thank you - Scirocco rules ! :-)
>Dirk
>
>here is his request :
>
>-----------
>on another note, have you ever heard of the thrust portion of the main
>thrust bearing wearing out. on my scirocco right now my crank shaft has
>so much end play that the back of the pressure plate rubs against the
>engine block when the clutch pedal is pressed. i pulled the tranny and i
>have .060" end play, i took the oil pan down and pulled the center
>bearing which is the thrust bearing and the thrust shoulder is totally
>worn down but the actual surface of the main bearings that ride against
>the journal are in great shape.
>have you every heard of this happening to a PL engine or any 1.8 for
>that matter. thing of it is if i put another cranck shaft in i dont want
>it to happen again. and by the looks of all the other bearings they seem
>to be getting plenty of oil. and the engine was just rebuilt about 3
>years ago.
>any info would help.
>-----
>
>
>
>
>
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