Thrust on crank worn again...

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Thrust on crank worn again...

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Thrust on crank worn again... - 8/18/2008 2:26:01 AM

pungieEC

Posts: 11
Joined: 8/18/2008
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Good day everyone

I have this problem with my car. A time ago the thrust on the crank with the center main bearing worn off. This resulted on play on the crank and changing gears is hell as the clutch doesn''t release properly. Last week it started again and I have done only about 30 000KM on the crank and bearings.

I''m from South Africa and the car I''m driving is a VW Golf 3 with a 1600 block. The previous crank ran with the standard size bearings. What I did as well to prevent possible damage again was to replace the self adjusting clutch cable, the release bearing, push rod, the clutch and pressure plate as well. Is there something I''m maybe missing? I don''t drive with my foot on the clutch.

Any sugestions?

Thanks.

Post #: 1

RE: Thrust on crank worn again... - 8/18/2008 5:36:25 PM

SwedishGP

Posts: 801
Joined: 7/9/2008
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You sure its the bearing? Sounds like a clutching issue to me? Anyone got some insite?

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RE: Thrust on crank worn again... - 8/18/2008 9:36:15 PM

bagel

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Maybe I''m thinking about this all wrong? What does the crank shaft have to do with shifting gears? I dunno mayube I dunno as much as I thought I did but you shift with tranny and linkages, not with the crank shaft that connects to rods to move pistons which are moved by fuel and spark which lites off fuel which makes the car "go". Maybe I''m missing something.......

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RE: Thrust on crank worn again... - 8/18/2008 10:24:36 PM

SwedishGP

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Thats what im sayin Bagel... Im all confused please expand on this issue if you would, I would think a spun bearing would cause a major engine issue such as stalling or shaking, are you sure its not the throw out bearing your talking about not working right?

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RE: Thrust on crank worn again... - 8/19/2008 1:07:31 AM

pungieEC

Posts: 11
Joined: 8/18/2008
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Good day.

I will explain quickly. What happens when I step the clutch pedal is that the crank gets pushed away (the crank has some play on it) in resulting that the clutch plate doesn''t disengage properly from the pressure plate. If the clutch doesn''t disengage properly it will struggle on changing gears. What I''m trying to figure out is what is causing the thrust on the centre of the crank to get worn off.

I will quickly upload a sketch...

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RE: Thrust on crank worn again... - 8/19/2008 2:34:36 AM

pungieEC

Posts: 11
Joined: 8/18/2008
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Tried to upload the images to this sites photo gallery. Doesn''t work. Here is a link to the photo''s:
http://www.mikotime.co.za/forum.html

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RE: Thrust on crank worn again... - 8/19/2008 2:48:19 AM

pungieEC

Posts: 11
Joined: 8/18/2008
Status: offline

Let me explain the blue arrows on the 1st image. When the clutch pedal is stepped, the push rod pushes in the direction of the blue arrows. It pushes the pressure plate (bolted on the crank) away from the clutch plate so that gear shift is possible. But what happens here as well is the crank moves. In result the pressure plate is not properly disengaged from the clutch plate.

What I found that causes the crank to float to the other side is that the center bearing''s thrust gets worn away and eventialy result in the floating.

Somebody told me to prevent the wearing of the thrust bearing is to replace the clutch components (clutch cable, release bearing, push rod, clutch plate and pressure plate), which I did previously when I did had the problem. They said those components when faulty can put unnecessary stress on the crank and bearings and eventualy the bearings fail. Another possibilty could be a bad material when manufacturing these bearings. But I''m not sure as these are the original bearings sold by the car manufacturer.

What else? Any one has suggestions?

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RE: Thrust on crank worn again... - 8/19/2008 3:04:44 AM

pungieEC

Posts: 11
Joined: 8/18/2008
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Another thing worth mentioning is when the engine is running the reverse and the 1st gears is impossible to shift when the clutch is stepped. But as soon the engine is off, those gears can work. I had to drive like that for the last week. When getting to a robot or stop sign, I have to switch off the engine, shift it to 1st gear and start the car again.

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RE: Thrust on crank worn again... - 8/19/2008 7:26:11 PM

SwedishGP

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Replacing clutch components isnt going to prevent a loose crank from sliding, are all your bearing caps torqued properly? How about the crank end seals are these still good? With good bearings and the right torque applied to the caps this thing shouldnt have sideplay at all when the clutch is engaged. Are you sure your throw out bearing is good? How about your linkage adjustment?

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RE: Thrust on crank worn again... - 8/19/2008 8:39:48 PM

Jrailer

Posts: 720
Joined: 12/8/2007
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i have seen this on a honda of my freinds he replaced thrust bearings and it lasted a few weeks
time fore a O.H. or a good used motor crank is worn out

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Post #: 10