Help!

[WutsHeh]

Hey all! I recently received a Tecumseh 5.5 Horse engine, and the shaft on it steps up from 5/8 diameter to 3/4 diameter, with a 3/16 key way. I believe it was keyed and tapped for a pulley. Is there any clutch I could put on this thing? The frame I’m putting it on is a one wheel peel, with a sprocket to fit a #35 chain. PLEASE HELP

 

[Whitetrashrocker]

Most gokart stuff is either ¾ or 1" stuff with ¼ keyway.
I don't even think they make an adapter sleeve for this.

 

[Hellion]

You could “sleeve it” with some tubing to bring the outer portion of the shaft up to the same diameter as the rest of it but the problem is the short keyway. You need a normal, full length keyway to key a clutch to the shaft.

Good on you for using a Tecumseh. However, to keep using it I see a replacement crankshaft in your future
You might find one nearly anywhere even fleabay if you know what you’re looking for.

What is the model number/engine code of your engine?

 

[ezcome-ezgo]

I don't think the small end of that shaft is 5/16th of an inch. Can you re-measure?

 

[Hellion]

Is this your engine [more or less]?

 

[WutsHeh]

Is this your engine [more or less]?

View attachment 155363

Yep! That looks like it for the most part

 

[WutsHeh]

I don't think the small end of that shaft is 5/16th of an inch. Can you re-measure?

Sorry 5/8 diameter

 

[WutsHeh]

Sorry 5/8 diameter

Had a brain fart or my phone autocorrected lol my bad

 

[WutsHeh]

You could “sleeve it” with some tubing to bring the outer portion of the shaft up to the same diameter as the rest of it but the problem is the short keyway. You need a normal, full length keyway to key a clutch to the shaft.

Good on you for using a Tecumseh. However, to keep using it I see a replacement crankshaft in your future
You might find one nearly anywhere even fleabay if you know what you’re looking for.

What is the model number/engine code of your engine?

The model number is: LH195SP-67516D

 

[WutsHeh]

You could “sleeve it” with some tubing to bring the outer portion of the shaft up to the same diameter as the rest of it but the problem is the short keyway. You need a normal, full length keyway to key a clutch to the shaft.

Good on you for using a Tecumseh. However, to keep using it I see a replacement crankshaft in your future
You might find one nearly anywhere even fleabay if you know what you’re looking for.

What is the model number/engine code of your engine?

Do you think a smaller made pulley clutch would be the best bet then? If I did that I would have to replace the sprocket with some kind of pulley too then. I’m not even sure where to look for a pulley that would hook up to the side of the tire like the sprocket does.

 

[Whitetrashrocker]

V belts and matching type pulleys don't drive karts very well.
Use a Centrifugal Clutch and chain for the simple little tire karts.
A better idea is a Torque Convertor like a comet 30 series.

 

[Hellion]

I think at the least, your crank could be sleeved on the 5/8" portion but the rest of the crank needs to be broached for a keyway [as well as the sleeve, probably (a split sleeve)]. Otherwise, you're going to have to determine which engine in the LH195 series has a straight 3/4", all-one-diameter crankshaft and get it. Er, at least all-one-diameter for the part of the crank that is outside the block.

Parts lookup for "LH195SP"
https://www.partstree.com/search/?type=model&term=LH195SP

PartsTree - Home of OEM Parts for Outdoor Power Equipment

We are committed to providing you with the largest selection of OEM parts from the best brands, the best diagrams and part search tools anywhere.

www.partstree.com

Click on an engine, scroll to part number 30 [crankshaft] and see if you can find photos for what these actually look like. FUN!

 

[Hellion]

I think a Hazard Fraught Parking Lot Sale is coming up in August, one of the best recurring sales. Pretty sure the Rotaderp 212cc will be discounted to $99.99. Get one or two and live happily ever after. It has the shaft you need that sounded dirty

 

[ezcome-ezgo]

Or maybe something like this:

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[Hellion]

Or maybe something like this:

Perfect, "parts right off the shelf" as it were. Now about that keyway.... I say he might need to extend it if just a little or a lot. The crankshaft steel should be pretty hardened beyond mild steel, but Mr. Abrasive Cut-Off is stronger. How feasible is it to cut more of a keyway with a hand held tool?

I think he should be shopping for a clutch first and most clutches I have seen only have a short key on the inside of the bore. Decisions, decisions....

Theoretical outcome:



I just realized that shaft is looooong. Perhaps too long for a simple centrifugal clutch. How long is it from the side of the engine to the end [minus the bolt and washer], WutsHeh?

You might hacksaw the "deformed" end off and then some more.

 

[WutsHeh]

Perfect, "parts right off the shelf" as it were. Now about that keyway.... I say he might need to extend it if just a little or a lot. The crankshaft steel should be pretty hardened beyond mild steel, but Mr. Abrasive Cut-Off is stronger. How feasible is it to cut more of a keyway with a hand held tool?

I think he should be shopping for a clutch first and most clutches I have seen only have a short key on the inside of the bore. Decisions, decisions....

Theoretical outcome:
View attachment 155414


I just realized that shaft is looooong. Perhaps too long for a simple centrifugal clutch. How long is it from the side of the engine to the end [minus the bolt and washer], WutsHeh?

You might hacksaw the "deformed" end off and then some more.

I actually thought about taking a cutting wheel to the 5/8 bit, and cutting the key way back some. I paint pretty often so I believe I’d have a steady enough hand and it’s 3 3/8 long. Pretty freakin long lol

 

[Hellion]

I actually thought about taking a cutting wheel to the 5/8 bit, and cutting the key way back some. I paint pretty often so I believe I’d have a steady enough hand and it’s 3 3/8 long. Pretty freakin long lol

The 212cc Rotaderp has a shaft that is 2.43 inches long which is plenty long for our applications and uses. With a longer shaft like yours, it's a liability having an "appliance" further out on the shaft -- you want the clutch mounted as close to the centerline of the crankshaft as possible.

Agreed on cutting off the 5/8" portion but you could cut it down to size [2.5"] and have the bulk of the exposed crankshaft [sometimes called a PTO] cut for a longer keyway. Plus you may need the end drilled and tapped deeper as that bolt and washer is crucial to clutch retention.

I'd take your engine apart, take the crankshaft to a local machine shop and get an estimate for those services. Shouldn't be too costly, I am guessing.

 

[Whitetrashrocker]

If someone came to my shop with a crank to cut, drill, tap and key, I'd probably charge more than $100.

A new rotoderp 212 is just a few dollars more and will bolt right up.

 

[Hellion]

I'd probably charge more than $100.

Of course you would.

Be neat to find out the price though. If he does it himself with a hacksaw, drill and grinder, it's best to have it out of the engine anyway.

 

[Hellion]

I believe it was keyed and tapped for a pulley.

By the way, it appears to have been a snowblower engine and yes, had a double-pulley setup on the shaft.