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Old 02-15-2011, 04:57 PM   post #1 of 23
Btackett
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Default Troy Bilt Junior engine replacement

I bought a TB Junior and the crank is busted. What retro engine replacement has anyone done? It has a double pulley on the back of the motor. Can this cover be removed and bolted onto another Tec or Briggs motor? I believe it is a 3 hp? Trying to find the manual online now.



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Old 02-15-2011, 08:16 PM   post #2 of 23
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Default Re: Troy Bilt Junior engine replacement

Other than a bad engine, it sure looks to be in good shape. Looks like you did pretty good. I would have to wonder what broke the crankshaft though.
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Old 02-15-2011, 09:06 PM   post #3 of 23
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Default Re: Troy Bilt Junior engine replacement

I don't know what would have broken it? Maybe low on oil and heat?? It is in really good shape and I hope someone replies on here. I am finding some H35 Tecumseh motors on ebay but they are all single shaft. I wonder if I could take a single shaft and use my cover and aux shaft parts to make one?
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Old 02-15-2011, 09:27 PM   post #4 of 23
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Default Re: Troy Bilt Junior engine replacement

I'm sorry, but I have no idea what engine would fit. The low oil and heat theory makes sense though for breaking the crank. The only Troy-Bilt that I've ever messed with is my old Horse with a 7 HP Kohler on it. I'm sure someone will have an idea and will chime in soon though.

Is the gear box still tight? The only other thing that I can think of to break that shaft would be getting the tines fouled up, but that should shred the belt before damaging the engine like that.
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Old 02-15-2011, 11:15 PM   post #5 of 23
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Default Re: Troy Bilt Junior engine replacement

Shouldn't the front belt be run inside that bracket & the rear belt straight up/down like the bigger tillers??????

Ronnie
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Old 02-16-2011, 08:00 AM   post #6 of 23
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Default Re: Troy Bilt Junior engine replacement

Ronnie, the belt is outside the bracket I guess because the shroud is missing and I was poking around with them. I don't know about the straight up / down like other tillers unless I had some pics to compare to. I found a side where some newer briggs inteks were adapted to the Pony models with a aux shaft but it did not give me enough info if it would work with this Junior model.
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Old 02-16-2011, 09:33 AM   post #7 of 23
ekibobrut1@optonline.net
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Default Re: Troy Bilt Junior engine replacement

I have same tiller.

If you do not need reverse gear, you can pick up a Greyhound engine from Harbor freight for $100-$150. It fits perfectly & does the job.
If you must have reverse, B & S still makes a replacement engine with the required output shaft for the reverse pulley. Last time I checked , they were around $300.
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Old 02-16-2011, 10:07 AM   post #8 of 23
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Default Re: Troy Bilt Junior engine replacement



I have an old B&S engine with the camshaft PTO pulley . It come from one TORO tiller. It is rare .
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Old 02-16-2011, 10:11 AM   post #9 of 23
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Default Re: Troy Bilt Junior engine replacement

Your fix is simple. Buy a similar Tecumseh engine, they are plentiful, swap your sump and cam into it and install. We do it all the time for snowblowers.

Dan
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Old 02-16-2011, 09:32 PM   post #10 of 23
Btackett
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Default Re: Troy Bilt Junior engine replacement

Dan, when you say any Tec engine do you mean any H35 model?
also, you said to swap the sump and cam? Are you talking about the aux shaft cam and cover on the rear of the engine?


Would this work? It is a model H35TO. And just replace the rear cover and pulleys from mine?




Bill

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Old 02-16-2011, 10:16 PM   post #11 of 23
eddyyy302
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Default Re: Troy Bilt Junior engine replacement

Right,
All you need is a long block that will accept the parts from your old engine, Tec. engines were built the same for MANY years. Therefore as long as you get an engine that mounts the carb and muffler the same as yours and is close to the same HP, you swap your cam with the shaft and sump onto the new engine. OR where did the crank break? did it damage anything else? I probably have a crank here if you want to swap it in. I am in the midst of 2 weeks of building engines for spring, so I am in the middle of organizing any leftover parts that I have this season.

Dan
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Old 02-17-2011, 08:18 AM   post #12 of 23
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Exclamation Re: Troy Bilt Junior engine replacement

I don't know where the crank broke but it is locked up and the PO took the carb off and kept it for another motor. I got the "broken shaft" if you call it that

Not worried about it, but now that I know I can buy a H35 and swap some parts I feel better. I can buy the motor in the picture for $150 with FREE shipping. I can use the rear cover and aux shaft parts and swap sides with the gas tank and it should work.

Sounds like a plan to me. I really want to get this tiller going as it will be used between my rows due to the narrow width.

I have a 44" hydraulic tiller that will do the most work in garden prep. As soon as I get a pump bracket made for it, it will be behind my JD400.

I have got way to many irons in the fire now and not enough time
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Old 02-17-2011, 09:02 AM   post #13 of 23
eddyyy302
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Default Re: Troy Bilt Junior engine replacement

Tear your engine about prior to ordering that engine and make sure that the cam and sump are not damaged.

Dan
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Old 02-17-2011, 10:40 AM   post #14 of 23
Btackett
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Default Re: Troy Bilt Junior engine replacement

That sounds like a good idea.

thanks for all your help. Maybe this will turn out ok. I really like to keep the Junior tiller.
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Old 02-19-2011, 10:19 PM   post #15 of 23
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Default Re: Troy Bilt Junior engine replacement

Dan, I took the sump off and it was a broken rod that killed it. Look at these pictures and tell me if you can swap the cover on any H35 motor. also , do all H35 motors have the gear on the crank like I am pointing to in one pic? I should be able to remove the new motor cover and replace with my parts. Any secret to holding the lifters in place while putting the cover/camshaft on? I would think to maybe use vasoline to hold them up while putting the cover on? How are the lifters ran on the engines without aux shafts? I would guess just like this one except minus the exterior shaft/pulley? Also , what is the trick to aligning the cam when installing the cover back?

The cam and all gears look fine. Also the crank looks good.

thanks for all your help on this. Sorry so many questions.



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