Help! i have a kenmore sewing machine model number 158.1355080 and the thread was not catching so i took apart the upper thread tension discs and i need to put them back together.

Have a look at link it may helps
http://www.repairsewingmachine.com/

If you getting loops on the bottom of your material, you need to re-thread the top of your machine. I say this because it is very rare when you will have to adjust the bobbin tension. But if you must, looking straight down at the bobbin as a clock- at 6:00 is the bobbin tension adjustment- lefty lucy, righty tighty. Hope this helps.
The shuttle is a half moon- shaped item. In the machine you will see a driver, which is the other half of that- another half moon. Put the shuttle into the driver to form a complete circle. Place the race cover on the race, snap left ear to the right, right ear to the left, insert the bobbin inside bobbin case, insert bobbin case into shuttle, and you should be good to go.

There is no specific pressure- it just cannot be too tight to bog the machine down and it can't be too loose so that the belt slips over the teeth.

I can walk you through the adjustments if you call my tech help line 732-335-8902. Have a thin philips head screwdriver as well as a flathead screwdriver handy when you call.
pls rate the solution if helped.thanks.

U have to go with a professinol repairer

Try this link may help

Sewingmachine.repairsewingmachine.com/diagram-to-thread-kenmore-sewing-machine-.html

Http://www.sewusa.com/Sewing_Machine_Repair/Thread_Tension_Settings.htm

see if that helps, if not contact sears or sewusa.com to aquire the manuals for this machine.

Its easy to locate from where the thread moves check that

THREADING DIAGRAMS

Did you put the bobbin in the right way round? Is the ends of the threads nice and long before you start sewing
and are you holding them as you start sewing? Some machines have a
slight tendency to 'eat' the thread tails as you start sewing if they
are too short or not held.Using the instructions in the manual, thoroughly clean the
entire machine, and oil all designated spots.

Clean the thread path, using lint free heavy thread or cord,
especially between the tension disks.

Remove the bobbin, and if possible the bobbin case and use a
soft brush to clean all areas of the case, lubricate if the
manual instructs you to do so, re-insert the bobbin case.

With the presser foot UP, thread the needle path, including
the needle.

Place a properly wound bobbin in the bobbin case, thread the
bobbin path (and once again, have the manual open to the
threading diagram and be sure you are catching the thread
under/over EVERY spring/slot/opening), leaving a 6" tail.

Holding the end of the *needle* thread in your left hand,
and with your right hand manually turn the flywheel (again
be sure you are turning it in the right direction, refer to
your manual) a full turn, until the needle goes down, picks
up the bobbin thread, and brings it up. Place BOTH threads
between the toes and to the rear of the presser foot, being
sure you leave at least 6".

Place your fabric under the presser foot, lower the foot.
Holding the thread tails firmly with your *left* hand,
slowly start to sew.

If none of this works, you may have to take your machine
back to the shop where you bought it for service and
lessons/instructions.
Just click below for the picture guides and instructions;
eBay Guides - HOW TO FIX YOUR SEWING MACHINE IN 5 EASY STEPS
Fix It Club | Small Appliances | Sewing Machine Repair

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Regards,
VOTIT