Model # 917.289072 19.5 42" When i engage blades it is very noisy like metal on metal It seems to cut ok but I don't want to mess it up more I changed blades and changed oil

Which blade are you using? You need a blade with a lot of teeth per inch to cut any thin metal.

with unit off look under at deck and inspect cable and pulleys and belt adjust and or repair

Something is binding in the mower deck area, perhaps and stuck bearing, bearing needs greased, stick or stone or big clod of grass caught between blade and deck or belt and pulley..
Disconnect to spark plug, and use a stick or something to spin blades manually. MAKE SURE spark plug is disconnected before EVER messing with blades. Motor could spin one time around accidentally and cut off your fingers. Disconnect plug wire and or remove plug to be absolutely sure before messing with blades. I'll say it again REMOVE plug wire from plug before inspecting blade area.

Number one are you sure you replaced the new blades with the right ones. Another thing if you say you have hit something you may have bent one or both shafts.the blades are fastened to. You can check this out by spinning the blades by hand . Please pull the starting key before you put your hand underneath to check it out.

Your belt may be on wrong or slipping.

Can you please show me where is the oil filter is so I can the oil

Hi Jen,

It depends on whether you have an older or newer model jigsaw. Bosch makes the newer ones with a button you push that will release the blade.
On an older jigsaw, look at the handle from above the jigsaw directly in line with the blade. You should see a screw in the top of the handle. Use a screwdriver and loosen this screw, don't remove it, and when the screw is loose enough, you'll be able to pull the blade out. When you put the new one in, slide it in the slot until it seats.

A rule of thumb is to use the blade with the wider gap and larger teeth on wood, the smaller teeth on metal. Most blades will say bimetal on the metal cutting blades.
Now, the courser the teeth the rougher cut you'll get. So, if you want a nice cut, don't use the blade with the largest teeth. Move down to the next largest.

I don't have a Bosch, so am not sure which codes are for which blades, but you can't go wrong if you go by the size of the teeth.

You didn't say what material the worktop is made of. If it's wood, the second largest toothed blade should be fine.

If you've never used a jigsaw before, I could suggest a couple tips that would help you get a nice job done.
First, put a piece of painters tape or masking tape over where you will cut, draw your line and go easy. The tape will keep the blade from giving you a roughed up top edge.
When you get near the end of the cut, hold a piece of scrap wood flat against the back edge to prevent tearout.
Also, let the saw do the work, don't push it.

Hope this helps, If it does, I'd appreciate a 4 thumbs up, Thanks,

Handie Andie, "woodworker by night"

Thicker metal shows greater blade / saw adjustment errors. A simple 1/64 or 1/32 wont show much on an 1/8 thick piece of metal when cut.
Those numbers will double quickly as the cutting blade travels through thick metal.
Metal band saws seem to be trickier to adjust and fine tune because the blade seems to be twisted into the roller guides.
The downloaded manual for the saw that looked most like mine at grizzly.com helped my adjustments a lot.
The saw quality is also a factor.

get down and gun your fingers in the slot that the belt rides in, soulds like you may have a small rock or piece of wood lodged in the v part of one of the pulleys. I bet thats it Jim

Blade Width is important when purchasing a band saw. Most saws accept narrow 1/8" blades for cutting detailed designs and tight curves. Better saws also accept wider blades. Wide blades don’t flex as much as narrow ones, but they make accurate straight cuts in thick stock quicker. There are also some wide blades available that can cut metal.