Kenmore 15816800 sewing machine Parts

On the Kenmore 15816800 sewing machine, the numbers on the upper-thread tension dial are a reference scale (commonly 0 to 9) that controls how tightly the top thread is pulled between the tension discs. Higher numbers increase top-thread tension; lower numbers decrease it.

What the numbers mean in real sewing terms

Most machines use the dial numbers as a repeatable “setting,” not an exact measurement. A good everyday starting point for general sewing is usually in the middle range (often around 3 to 5), then you fine-tune based on how the stitch looks.

• Higher number: tighter top tension (top thread pulls harder)
• Lower number: looser top tension (top thread pulls easier)
• Balanced tension: the stitch “knot” sits inside the fabric layers
• Top thread showing on the bottom: top tension is usually too loose
• Bobbin thread showing on top: top tension is usually too tight

Quick adjustment checklist (best practice)

Before changing bobbin tension, we adjust the top tension and re-thread.

• Raise the presser foot, then re-thread the top thread (this opens the tension discs)
• Confirm the thread is seated in the take-up lever
• Install a new needle matched to fabric and thread weight
• Use quality thread and a correctly wound bobbin
• Test on a scrap of the same fabric using the same stitch

Symptom-to-setting guide

What you see	Most likely cause	What to try first
Bobbin thread visible on top	Top tension too tight	Turn dial down 1 step at a time
Top thread visible on bottom	Top tension too loose	Turn dial up 1 step at a time
Loops on underside	Top not threaded correctly or too loose	Re-thread with presser foot up; then increase tension
Thread breaks	Too tight, wrong needle, snagged path	Lower tension slightly; replace needle; check thread path

Why it matters

Correct tension prevents skipped stitches, puckering, thread breaks, and “birdnesting” under the fabric. Small changes (one number at a time) keep your Kenmore 15816800 sewing smoothly and protect the needle, thread path, and tension discs.

For more troubleshooting paths when stitches look wrong, use our DIY symptom guides like sewing machine skipping stitches.

Last updated: February 2026

Timing repair on a Kenmore 15816800 sewing machine typically costs about $100 to $250 for labor and adjustment; the total can be higher if worn parts (hook, gears, belt, needle bar components) also need replacement or if the machine is seized and requires extra teardown.

What “timing” repair usually includes

When we talk about sewing machine timing, we mean synchronizing the needle bar movement with the hook/bobbin area so the hook catches the upper thread correctly.

Common steps in a timing service:

• Inspect needle bar height and hook-to-needle clearance
• Re-time the hook/shaft relationship
• Check feed timing and stitch formation
• Clean lint buildup around the hook race and feed dogs
• Test sew on multiple fabrics and stitch lengths

What changes the price the most

These factors drive the estimate up or down:

• Mechanical vs. electronic model (mechanical models are often faster to adjust)
• Cause of the timing issue (needle strike, jam, broken gear, worn hook)
• Parts needed (timing alone vs. timing plus hook/gear/belt replacement)
• How stuck the machine is (lockups add labor)
• Local labor rates and bench/diagnostic fees

Typical cost ranges (what to expect)

Repair scenario	Typical total cost	Notes
Basic timing adjustment only	$100 to $200	No parts, minimal disassembly
Timing plus cleaning and tune-up	$150 to $250	Common when lint and old oil contribute
Timing plus parts replacement	$200 to $400+	Hook, gears, belt, or needle bar parts

Quick checks before paying for timing service

These steps can prevent an unnecessary timing repair:

• Install a new, correct needle (bent needles mimic timing problems)
• Rethread upper thread with presser foot up; reinsert bobbin correctly
• Remove needle plate and clean lint from feed dogs and hook area
• Confirm the handwheel turns smoothly; do not force it if it binds
• Test with quality thread and the correct bobbin type

Why it matters

Incorrect timing causes skipped stitches, thread shredding, birdnesting under fabric, and needle breaks. Fixing it promptly helps prevent damage to the hook and gears, which is what turns a simple adjustment into a bigger repair.

For step-by-step troubleshooting paths that often overlap with timing symptoms (skipping stitches, lockups, fabric not feeding), use our DIY resources like sewing machine locks up.

Last updated: February 2026

Thread bunching on a Kenmore 15816800 sewing machine is almost always caused by incorrect threading (top thread or bobbin), wrong tension, or a needle issue; the thread then “nests” under the fabric when the stitch can’t form cleanly.

Quick fixes that solve most thread bunching

• Rethread the machine with the presser foot up (this opens the tension discs so the thread seats correctly).
• Remove and reinstall the bobbin; make sure it unwinds in the correct direction and is fully seated in the case.
• Hold both thread tails (top and bobbin) for the first 2 to 3 stitches.
• Install a new needle; use the correct needle type and size for your fabric.
• Set stitch length and width back to a normal baseline (for many seams: medium length, straight stitch).
• Clean lint from the bobbin area and under the needle plate; lint can prevent proper tensioning.

What the location of the “bird’s nest” tells you

Where the thread bunches	Most likely cause	What to do first
Under the fabric	Top thread not seated in tension discs, presser foot down while threading, or top thread missed a guide	Rethread with presser foot up; verify every guide
On top of the fabric	Bobbin not seated correctly, bobbin thread not in the tension spring, or bobbin wound poorly	Reinstall bobbin; rewind bobbin evenly
Happens only on thick seams	Needle too small or dull; thread too thick; speed too high	New needle; slow down; match needle and thread

Why it matters

When tension and threading are correct, the top and bobbin threads lock in the middle of the fabric. If either thread path is wrong, the machine can’t balance the stitch, so excess thread gets pulled into the bobbin area and tangles.

If fabric is not feeding and thread piles up

If the fabric is not moving, stitches can stack in one spot and look like bunching. Check feed dogs, presser foot pressure, and stitch settings using our guide: sewing machine fabric not moving.

Last updated: February 2026