assembling crankshaft problems again....

oyk · Feb 12, 2006

couple of hours ago i tried to put back together my engine.
i put the crankshaft first in to the left case and then the right case.
i gently tapped it with a plastic hammer and the screwed it...
the more i tightened the screws the more the crank got harder to spin.
again i tapped crank's both sides but with no result.

i reassebled it to check if the bearings where out of place but they were not. again the same procedure and still nothing.

i came up with the same problem a year ago and i think that there is something i do wrong.

any suggestions on this one?

Taffy · Feb 12, 2006

oyk

if you have had a new big end and the crank was pressed together there must be the chance that they didn't press the two flywheels close enough. the best way to check this is to measure with a feeler gauge - the gap between the con rod and the crank flywheel. essentially it seems that your crank is now too wide.

let me know how you get on.

regards

Taffy

PowerFiend · Feb 13, 2006

Are you using the original roller bearings or the new style cylindrical bearings? With the original style, don't you have to press the case/bearing combo onto the crank?

Have you also verified that the crank is running true? If the runout is off it will be harder to turn as everything gets lined up.

Aspen · Feb 14, 2006

Wait a minute... that 1995 uses ball bearings, right?
So there is somewhat of a press fit between bearings and crank.
If you just press it together, the very last bit of clearance can be hard to reach and you end up with residual axial pressure on your main bearings.
Applying a little bit of heat on the bearing while cooling off the crank (and the other case half) is the way to go. The halves should be easy to fit now.
Put the sealant on the cold case side and leave the main seal out not to damage it when you heat the bearing. Pop the seal in place when you are done. Works for me.

Of course, if there is misalignment or something else wrong, then you have to take care of that, like suggested above.

Good Luck!

oyk · Feb 16, 2006

thank you all for your posts,
the distance between 2 flywheels is corect and yes, my berg has deep groove single ball bearings for the crank and it is press fit not loose.
after your opinions i consider that there is some clearance left and will have to reach it carefully.

i ll' keep me posted

PowerFiend · Feb 16, 2006

oyk said:
thank you all for your posts,
the distance between 2 flywheels is corect and yes, my berg has deep groove single ball bearings for the crank and it is press fit not loose.
after your opinions i consider that there is some clearance left and will have to reach it carefully.

i ll' keep me posted

Just to check, you are using a tool to press on the inner part of the bearing over the crank. The bearing should have already been pressed into the case half with the force on the outer part of the bearing. I like to freeze the parts for an easier fit (Cold shrinks the parts).

Your assembly discription is kind of vague, if you are using the case bolts to pull the case halves together, that is not a correct assembly procedure.

The correct tool to press the bearing onto the crank typically bolts to the crank half you are working with, this way you are not putting a load across the crank pin(connecting rod big end).

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assembling crankshaft problems again....

oyk

Taffy

PowerFiend

Aspen

oyk

PowerFiend

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