Type 4 Flywheel bolt Pattern?

johnx51 · Posted: Mon Apr 25, 2016 5:52 pm Post subject: Type 4 Flywheel bolt Pattern?

Hey
I have been searching all weekend for the measurements on the type 4 flywheel.
Heres the thing I think I need the type 4 200mm flywheel but I'm not mounting it to a type 4 but a 3 cylinder Kubota Diesel Very Happy

.
The crank on it has 5 bolts and they look to be the same as the type 4 but I want the measurements first before I order the flywheel. If they don't line up I will just machine one of my 12v flywheels.

johnx51 · Posted: Tue Apr 26, 2016 6:33 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Nobody has a type 4 flywheel laying around that they could measure the crank bolt pattern?

Busstom

I am about to separate mine tomorrow. What feature are you looking for? The diameter of the bolt circle?

johnx51 · Posted: Wed Apr 27, 2016 9:22 am Post subject: Re: Type 4 Flywheel bolt Pattern?

Yes I need the circumference of the bolthole pattern in the circumference of the crankshaft and the depth of the pocket.

It's really close to the size I believe. I have laid out a 12v flywheel and I can probably machine the difference into it. But I really believe that the crank in the same 5 patten that's on the type 4.

Thanks by the way

Busstom · Posted: Wed Apr 27, 2016 8:19 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Sorry buddy, I can only derive two numbers for you at this time: the depth of the pocket is 8mm; the circumference of the pocket is 183.85mm; obviously, the crank flange is just an RCH smaller.

I was going to use the diameter of the bolt holes, the distance to the wall of the pocket, and calculate the bolt circle (what you refer to as the pattern)...but the holes in this FW are different distances to the wall, meaning they're either slightly different diameters, or the circle isn't concentric with the pocket bore. Either way, I just don't have the time to delve that deeply into it at this time.

FWIW, the five bolt holes are ~13mm.

modok · Posted: Wed Apr 27, 2016 8:37 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

The type-4 bolt pattern is WAY smaller.

The kuboda has a big flange on the back of the crank, never seen one that isn't, but maybe I haven't seen them all.
Don't give ME a hard time about measurements, YOU can measure first, and I'll see if it matches.
I'm not gonna map out the whole thing and then find out you are eyeballing it with a plastic ruler.

johnx51 · Posted: Thu Apr 28, 2016 4:10 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Thanks Bosstom. The crank coming out of the Kubota is 197.95502mm just a BCH bigger I can machine that no problem. I'll take about 1.5mm off a type 4 flywheel and take my chances with the bolt pattern And modok no ones giving anybody a hard time.

modok · Posted: Thu Apr 28, 2016 4:21 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Ok cool, now get your calipers and measure it already

johnx51 · Posted: Thu Apr 28, 2016 5:30 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

What are you talking about? I don't have a type 4 flywheel to measure. That's why I was asking on here. I've never messed with a type 4. I have a 66 split and a 71 1302. I just wanted to make sure there is enough machinable surface to work with. Before I ordered type 4 200mm flywheel, and trust me I have more than just calipers to make measurements.

modok · Posted: Thu Apr 28, 2016 5:53 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

oh, sorry
I thought you were asking about the bolt pattern, as that was the title of the topic.
If you have it figured out good!
I might add the pattern later if I find it, so suckers using the search function don't read all this for nothin. Confused

johnx51 · Posted: Thu Apr 28, 2016 6:45 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

I still need the pattern myself to double check to see if the Kubota's pattern fits.bolt pattern circumference to bolt pattern circumference. If it does it will save a load of money and I might do a write up about the conversion if it turns out good. Thanks for the help guys.

Busstom · Posted: Thu Apr 28, 2016 9:54 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Am I crazy? I'm not sure why you're referring to it as a bolt pattern circumference. Based on everything you have been saying, you really need only one thing: the bolt circle diameter. Period. The "circumferences" you're referring to are completely, totally irrelevant. It makes zero sense to calculate any circular bolt pattern based on circumference, because circumference is dependent on and directly affected by hole size, and therefore useless. What IS relevant is the hole centers, because THAT is what the bolt pattern is based on, because the screws all have to line up...and that bolt pattern is based on a bolt circle diameter, not a circumference.

So the "bolt pattern" question is answered, it's 5 equal spaces about a circle, a circle that should be datumed at true center position to the rotational axis of the object (the crankshaft, in this case). So now you can change the diameters of the fastening screws, within reason, about that same circle, because bolt circles are based on diameters - and therefore screw centers - not circumferences. Make sense?

So all you need now is the BC diameter, cuz you're a machinist, you can modify all the other features to make it work. Wink

johnx51 · Posted: Fri Apr 29, 2016 5:05 am Post subject: Re: Type 4 Flywheel bolt Pattern?

By bolt pattern circumference I mean the imaginary circle created by the center of the bolt holes. There for you can still have a 5 bolt pattern but the spacing is different. Example 5 Bolt pattern at a 138mm circumference is bigger than one at 118mm circumference. To measure this you would mark the center of the bolt holes and the trace a circle then find the diameter.

so yes all I need is the BC diameter and I can map out the rest.

I wouldn't call me a machinist just happen to be a 22yr old that happens to have a few lathe's and milling machines in my shop.

Randy in Maine · Posted: Fri Apr 29, 2016 6:29 am Post subject: Re: Type 4 Flywheel bolt Pattern?

PM me your address and I will send you one of these....

http://www.busdepot.com/021105275

Busstom · Posted: Fri Apr 29, 2016 7:18 am Post subject: Re: Type 4 Flywheel bolt Pattern?

johnx51 · Posted: Fri Apr 29, 2016 9:17 am Post subject: Re: Type 4 Flywheel bolt Pattern?

I us asking for circumference because it's a five pattern and I figured it would be easier for someone to find and I could get BC diameter. Also it's a blessing to have a good shop. I own a industrial maintenance business and thank you I sent you a pm .

Busstom · Posted: Fri Apr 29, 2016 8:02 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Hey buddy, I got shiitty news from the doctor today, so I won't be tinkering in the garage for a while. By the way, I didn't see a PM.

modok · Posted: Sun May 01, 2016 4:57 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

five 12mm bolts centered on a 41.5mm diameter circle

I'm not sure if it is exactly 41.5. Measuring the flywheel and crank different ways my results varied from 41.0 to 41.7, probably because the flywheel is not very precise.

johnx51 · Posted: Sun May 01, 2016 8:58 pm Post subject: Re: Type 4 Flywheel bolt Pattern?

Thank you guys.

With the measurement you gave me Modox it is within a couple µm.
I have already took the gamble and ordered the type 4 200mm flywheel and it will be here tomorrow so its going to be the moment of truth.

I will draw everything out on CAD and make a PDF for future reference.

Busstom sorry to here hope you get well.

Thanks Again

also I would like to start a tread for this build where would be the best place?


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