How to: Preator two shaft engine - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 03-21-2014, 08:15 PM Thread Starter
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How to: Preator two shaft engine

I have been working on this project, just to see if I could do it. I spent days, on the internet, trying to find a basic, generic, cast aluminum box, that was narrow. I wanted to save space, so I would not have to extend the engine crankshaft, any more than need be. Only found one, and it was not cost effective.

Started looking through my engine parts boxes, and found 2 Wisconsin BKN oil pans. Right size, but would require a back-plate to complete the gear box.

I used a Tecumseh H-60 crankshaft gear and cam shaft. By turning the lobes, off the cam shaft, and installing it backwards, it gave me the extended 2ed shaft that I needed. The crankshaft gear remained stock. This will become a book, if I keep writing details, so here are some photos. ---- John


Stock Tec. H-60 camshaft + Crankshaft gear.


Camshaft, after machining.


3/4" to 1" crankshaft adapter. Also holds gear, seals and a locater bearing.



Back-plate, after machining.



Back-plate mounted.



Side cover (oil pan), after machining.



Finished prototype. Will add a flat, or keyway to the small shaft as needed, and cut to proper length.
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post #2 of 18 Old 03-21-2014, 09:24 PM
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Hey, nice job. The one small problem I see is most of the Tecumseh's had the camshaft PTO up slightly higher then the crankshaft. Not a major problem and can probably be fixed with different size belts.

Can't wait to see it in use on something.

Any plans to mass produce and sell the adapters?

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post #3 of 18 Old 03-21-2014, 10:59 PM Thread Starter
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Although it would be an easy fix, you had me double checking the height of the pto cam shaft. I checked an H-50 and an H-60, and the center height of each shaft is the same, from the base of the engine. If the 7 and 8hp engines, share the same side cover, then they would be covered also. I know the H Tecumseh`s, under 5 hp. are not the same side cover.

I plan to build a 2ed unit, for a Predator 346. It is going on the only 2 shaft powered blower, that I have. The 346, already has a 1" PTO, so the only change, will be a short adapter, to hold the oil seals. The cam part, will be the same.

Pretty sure I can use the wider H-60 side cover, for the gear box, on the 346 cc engine. The crankshaft is 1" longer to start with. It will just mean, sliding the engine back a bit more, on the blower frame. -- John

=============================================
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Originally Posted by Shryp View Post
Hey, nice job. The one small problem I see is most of the Tecumseh's had the camshaft PTO up slightly higher then the crankshaft. Not a major problem and can probably be fixed with different size belts.

Can't wait to see it in use on something.

Any plans to mass produce and sell the adapters?
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post #4 of 18 Old 03-22-2014, 05:12 AM
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Twin shaft

Very interesting! Too bad they can't be bought that way in the first place.
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post #5 of 18 Old 03-26-2014, 02:51 PM
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VERY cool! Subscribed.


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post #6 of 18 Old 03-26-2014, 03:41 PM
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thats awesome! im sure if you mass produced it it would sell great!
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post #7 of 18 Old 03-27-2014, 05:03 PM Thread Starter
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[QUOTE=

I plan to build a 2ed unit, for a Predator 346. It is going on the only 2 shaft powered blower, that I have. The 346, already has a 1" PTO, so the only change, will be a short adapter, to hold the oil seals. The cam part, will be the same.

Pretty sure I can use the wider H-60 side cover, for the gear box, on the 346 cc engine. The crankshaft is 1" longer to start with. It will just mean, sliding the engine back a bit more, on the blower frame. -- John

=============================================

Had planned to buy the Predator 346 in mid may, before my last 25% off coupon expired. Looked online, and saw that the $249.00 sale price was only good while supply lasts. Called my local store, and they only have 1 left in stock.

Decided to order one on line now. For $6.99, it will be delivered to my house, and I won`t have to try and wrestle the box, into and out of the back seat of a Toyota Tercel . Final price, with sales tax is $206.14.

Anyway, I have decided to use a Tecumseh H-60 side cover, for the 2 shaft unit, on the 346. I have been as busy as a bumble bee, stuck in a tar bucket, for the past few days. Got all my ducks in a row, as far as parts design and made some drawings to follow. Just waiting for some 3/8" aluminum flat stock, 2" round stock, and some bearings and seals, to come in the mail.

After seeing my design, for the use of an H-60 side cover on the 346. I think I can adapt it to the 212 also. My original prototype for the 212, may already be obsolete.

Here is the "beginning" only, of the rework, on the H-60 side cover.---John

Before & After, on the inside ---



Before & After on the outside ---


Last edited by Waterlooboy2hp; 02-28-2015 at 06:25 PM. Reason: replacing missing photos
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post #8 of 18 Old 05-15-2014, 11:25 PM Thread Starter
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[QUOTE=Waterlooboy2hp;206650][QUOTE=

I plan to build a 2ed unit, for a Predator 346. It is going on the only 2 shaft powered blower, that I have. The 346, already has a 1" PTO, so the only change, will be a short adapter, to hold the oil seals. The cam part, will be the same.

Pretty sure I can use the wider H-60 side cover, for the gear box, on the 346 cc engine. The crankshaft is 1" longer to start with. It will just mean, sliding the engine back a bit more, on the blower frame. -- John

================================

Here are the fruits of my labor. Ran into a few small problems, that I had not for-seen, but was able to work them out. Working out the problems, is what makes an idea interesting. - John



I made 4 bolt-in flanges, for the bearings and seals, on the back-plate and H-60 side cover.



The modified H-60 cam.


Crankshaft adaptor for seals, bearings and modified H-60 crankshaft gear.


New drive pulley, with hub extension. (could not use original, long hub pulley, due to rust) -- Extension was made from an old chain sprocket.


Crankshaft extension. (not really needed, but I like overkill)


Back-plate, with gearing in place.


Original pulley, for the added output shaft. Just added 2 more set screws.


That`s all folks.
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post #9 of 18 Old 05-16-2014, 06:41 AM
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You do some really nice work John. If I need machining done I'll be up to see you!
Seriously, that is skme very fine, thoughtful machine work. You should be proud.

Joe

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post #10 of 18 Old 05-17-2014, 02:27 PM
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Nice job! What do you plan for lubrication?

Pete
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