The correct way to measure the o.d. of piston is a micrometer. To measure the bore of the engine would be to use bore gages or T gages.

Thanks for takeing time from your busy schedual to make this Video!

I'm a machinist of 40 yrs and this well intentioned, very knowledgeable guy is just checking that the piston is in the ballpark, not one or two standard over-sizes. I hope he inspected the bore for scoring but for any other work what's a small garage/home/ shop supposed to do if the piston is manufactured wrong?Plus aren't some of these cylinders chrome plated or nikasiled? Around the house I have a 6" Harbor Freight plastic caliper, it was under $20 I trust for 2 or 3 thou. Good work

I recently purchased one of those for my Onan restoration, its a great tool to have.

wow man, big change, I wish you the best and hopefully you will still be posting vids

you did a great job sir, thankyou

If you know the piston sizes are correct and are selecting off the shelf rather than measuring then that looks fine, I often use calipers to check something is "somewhere close" To Accurately Measure a Piston I'd use a micrometer to check OD then a dial gauge, V block and height comparator stand to check for out of round.

thats awesome.......do they make oversized piston kits for stihl equipment?

Smashing :-) I bought a digital caliper from my local aldi store, £8 (about $12 and 70cents us), its been so handy for quick checks. Its not perfect but for 8 pounds i dont expect it to be lol.

Correct...but for comparison reasons(std vs oversize), calipers will be close enough unless you are boring/honing to size. Also, based on piston design, it's important to measure at a specific point on a piston to get the correct bore diameter. Check with the manufacturer for the proper point. Many pistons taper...smaller at the ring lands, wider at the skirt(bottom).

doing well......i recently had a job offer at a ford/new holland dealership and i took it......they are sending me to school in a few months to get diesel certified....wish me luck brother!

Thank you!

The Proper way is to measure it in top, center and bottom. Thrust and Pin sides. But, The tool you use, Is a micrometer, and T gauges.

Dony, can you let us know how that Italian made piston works out for you? I've used one in the past along w/ a new cylinder and it just didn't hold pressure as well as the OEM. I had about 100 psi compression after the rebuild.

remember that i'm not working on the Space Shuttle

have a nice weekend steve

Very good to know.

Dial Caliper is ok to measure the OD, I was a machinist for many years, but I do have Mics, If I feel the caliper is off. One cylinder, small engine, a caliper is just fine. If it was the bore that would be different, I used to make go no go gauges running a cnc, saved a lot of time and when you place the piston in the bore, you know if there is any slop.... Nuff said. :)

What is the best way to measure a cyliner bore

good tip.

What if the top part of the piston measures 0.5 less than the bottom part/skirt of the piston. For example: Top part of the piston 61.58mm, piston skirt is 62.04mm

Any way you could make a video on how to change the killswitch for a Husqvarna 36 chainsaw?...or maybe even recommended one? I can't seem to find anything and I'm clueless.

So what size rings would he use?,,,

Hi Donny. I need to ask a question about a repair I am attempting. I have a Poulan Pro chainsaw that the recoil starter is very hard to pull. With the spark plug removed, everything works smoothly and turns very easily. Everything seems to be in working order but the saw will not start.

You are right donyboy, After 30 plus years as a tool & die maker I got carried away.

THANK YOU

Does Digital Caliper Last Longer ??

it depends on the stroke.

How many cc's is 34mm?

i've seen aftermarket ones on ebay,

Hi Donnyboy;I need to pick your brain.My friend has a vintage Johnson Iron Horse 4 cycle engine.I found a head gasket and cylinder gasket for it on Ebay,but he needs a set of rings for it as well.Hope you can point me in the right direction for the rings.Like your channel watch all your vids.

my issue is finding the 2 outermost points

I need to replace my piston Does this way work on a 4 stroke 10hp B&S engine.

@JimShai-yf4et

4 жыл бұрын

Yes

i would have to doublecheck that

next comment will be that "it's not brain surgery" lol

that sounds accurate, the piston in the video is from an fs85

You're wrong. For selecting std or oversize, which is what the OP did, it's perfectly acceptable to use a dial caliper. He's not boring/honing a cylinder to size otherwise, you'd be correct.

50cc=39mm. So i think it's around 25.4CC'S.I just googled it, but im not sure. 34mm (25.4cc)

Avoid the plastic bodied ones which are the cheapest & least accurate. It's "You get what you pay for" but depending on the quality & accuracy you need, using something not top of the line could be ok. I think the best brands are: Starrett, Brown & Sharp, Mitutoyo, Mahr. You can't go wring with any of these name brands. I do know most people don't want to spend a few hundred on a pair of calipers. I have a Carrera, model #CP9808 they cost $40, Good enough for what I do with them.

how are you anyways?

they are definitely not as good as oem unless you get the Tecomec brand

you are using those calipers wrong, you should only measure with the tapered tip, you a measuring too far in

@

Measure in "standard" size lol, the usa measurement system is so stupid. the system is not based on a coherent and intuitive set of units. Also it is a vernier gauge !! And not the way to do this

Elon musk?