Crank shaft need pressed in?

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Old 06-12-07, 03:53 PM
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Crank shaft need pressed in?

I am curious, if you rebuild an engine down the need to be pressed in or something?
 
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Old 06-12-07, 04:50 PM
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erm perhaps I meant camshaft? I dunno
 
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Old 06-12-07, 05:12 PM
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well, which is it.?




in most engines neither a crank or a cam are not pressed in.

I can;t think of any that are. The only really odd situation I can think of is an Offenhouser 4 cyl (the one they used to use in Indy cars) where the block was heated and the crank cooled when you put the crank in the block. Very unusual though.

what kind of engine are you speaking of?
 
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Old 06-12-07, 05:13 PM
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camshafts are just lubed up and slide right in. I don't know anything on a typical engine that needs to be pressed in.
 
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Old 06-12-07, 07:28 PM
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on an OHC, you just lay them in the saddles and put the caps on and torque them.
 
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Old 06-12-07, 09:04 PM
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if vw

vw flat 4 air cooled and water-cooled as used on Vanagon require the timing gear (distributor dive) be pressed on/off of crankshaft.
at the same time, one of the main bearings must also be r&r as it cannot be removed with timing gear in place.
 

Last edited by peabees; 06-12-07 at 09:05 PM. Reason: missing info
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Old 06-13-07, 04:52 AM
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It is an '87 Chevy S10 2.5L. We rebuilt it and we would get it in time and start it and then stop it then try to start it again and it'd be out of time completely. It would backfire through the TBI and someone said something about pressing the crank shaft or something on the crankshaft so I was just wanting to find out more.
 
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Old 06-13-07, 01:57 PM
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well, I don;t know any specifics of this engine but if it is a typical cam in block and it still uses a distributor, there are only 2 things I can think of that would cause the timing to jump such as you have described.

the timing chain, if it has one, if it is loose, it could allow the chain to jump and cause the relation between the crank and cam to become out of time


the gear on the distributor shaft. The last I saw, Chevy used a roll pin to hold the gear on the dist shaft.If that pin was sheared, it would allow the gear to rotate to a different point than the pin would hold it in. When a pin shears, it can leave the fit tight enough so the gear would appear to be still pinned and since there is very little resistance that would keep the dist from rotating while the gear spun, it could hold tight enough most the time to keep it in place.

barring any more info from you, those are the two places I would look.

Maybe there are a few Chevy guys here that are more familiar with the specifics of this engine that can help you more.
 
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