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Is This Okay..

nissan200sx.dk
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nissan200sx.dk Community Regular

nissan200sx.dk

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Thanks for all the replys.

If it is clearance issues why does it change then? Its ONLY when it has been sitting still for a little minutte, it "binds".

Have measured accuratly today with a torque dial gauge. (built in dial gauge), range 0-8N. Its calibrated 2 times a year.

To break the "bind" it need ~6 N.

To rotate it need ~2N, after the "bind" has been broken.

If I start rotate just after stop, I still need ~2N.

If I wait 15 sec, it need ~6N to begin rotation again. (If I wait 5 min. it still is 6N to begin rotation)

There is NO spots were it need more or less N to keep rotation.

Have talked to a engine builder here in Denmark. He says when the crank rotates it draws oil on to the surfaces, 2N friction, when it sits still the oil runs back in the grooves, and crank makes contact with bearing, that is what I need to overcome?

The block is upside down, and havnt tryed doing this when block isnt upside down. Could this have any influance?

Tomorrow I should check for endfloat, and run out on number 4 bearing? What more should I check?

proengines Rising Star

proengines

Posted
Posted

The crankshaft runs on a hydrodynamic wedge of oil which can be squeezed out when the crank sits for a bit and the crank sits against the bearing. Once you turn the crank you pull oil between the crank and the bearing and the crank floats on it. I'd still check the end float, most bearings are made at the maximum thrust flange width which can reduce the thrust clearance anyway. It's quite common to have to sand the thrust face of the bearings to provide the proper end float.

Cheers,

Greg.

nissan200sx.dk Community Regular

nissan200sx.dk

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Posted (edited)

Endfloat is: 0.08mm

Run out, measured on number 4 main bearing, is 0.015mm. This is total what the dial show. Souldnt this be cut in half to get correct run out number?

Edited by nissan200sx.dk

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