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Sears ST/16 ?


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#1 KennyP ONLINE  

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Posted October 01, 2020 - 03:56 PM

What is the diameter of the pulley for the drive belt? I know the belt is a 5/8" width, just need an approximate diameter for a possible project. Thanks!


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#2 4getgto ONLINE  

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Posted October 01, 2020 - 06:02 PM

That may be something you'll have to guesstimate at. "I'm sure you already know" I'm assuming this is for the Predator swap..?
The crankshaft height will (might) be different from the other motors that were used so that makes a difference in belt lengths.
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#3 KennyP ONLINE  

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Posted October 02, 2020 - 04:26 AM

That may be something you'll have to guesstimate at. "I'm sure you already know" I'm assuming this is for the Predator swap..?
The crankshaft height will (might) be different from the other motors that were used so that makes a difference in belt lengths.

Yep, going to put the Predator in it. I'll have to drill mount holes for it, just be nice to know what size the pulley originally was. I would imagine the SS/16 drive pulley would be the same size (just different ID).


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#4 Banjopicker10 ONLINE  

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Posted October 02, 2020 - 11:21 AM

I'm pretty sure most of them had an approximate 2:1 belt ratio so for instance if it had a 6 inch on the transmission it would have a 3 inch on the engine so i would try going off of that i'm not guaranteeing that it will work but its a good place to start.


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#5 KennyP ONLINE  

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Posted October 02, 2020 - 12:58 PM

Whilst waiting on an answer for the pulley size, I brought the old girl up and swapped the rear tires. I also garnered a 30# weight off the tiller to use somewhere.

DSCN5329.JPG   DSCN5330.JPG

 

Here's the size difference:

DSCN5331.JPG

 

And on the tractor:

DSCN5332.JPG

 

Then I got to thinking. I happen to have a good running B&S 16 HP (cast iron).  It would take more effort, but that could be installed. May take more mods to get it to fit, but I'd have electric start.

DSCN5333.JPG   DSCN5334.JPG

 

Decisions, decisions!


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#6 secondtry ONLINE  

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Posted October 02, 2020 - 01:18 PM

All of my Sears/roper tractors with the Onan engines have 3 step pulleys. The outside step is 3". The next step in is 4 3/4". The Inner step for actual drive is difficult to measure exactly but seems to be about half way between the other two.

   Don 


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#7 KennyP ONLINE  

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Posted October 03, 2020 - 07:56 AM

Well, I gotta quit thinking so much. Just remembered I also have a good running Kohler 14 HP. That may be what I go with as I do love the Kohler engines.

 

All of my Sears/roper tractors with the Onan engines have 3 step pulleys. The outside step is 3". The next step in is 4 3/4". The Inner step for actual drive is difficult to measure exactly but seems to be about half way between the other two.

   Don 

olcowhand has one of those pulleys he is sending me. I'll have to get a bushing for a 1" shaft for it.


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#8 KennyP ONLINE  

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Posted October 05, 2020 - 06:17 AM

I have decided to use the Kohler. It's a K321S-6013B spec. engine from the Jacobsen 1450 Super Chief, I am trying to get the wiring figured out. This has the breakerless (trigger) ignition. The white wire from the trigger goes to the ignition switch, but I have been unable to figure if it is grounded when the switch is off. I DO NOT want to put 12V to it if it is a grounding (kill) wire. The trigger is a NLA unit. So far, testing with an ohm meter shows the wire as open to ground, but that may be a bad connection. I'll mess it more today until I am sure what this wire needs. I have not found a wiring diagram for this anywhere and the Jake wiring is to vague. If anyone is familiar with this type of ignition, please post.



#9 KennyP ONLINE  

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Posted October 05, 2020 - 08:17 AM

Well, it looks like olcowhand has helped me find the answer on the wire. The WH GT14's had the same engine around 1970. Found a wiring diagram for it and it shows the wire going to the M terminal of the ignition switch which should be grounded when the switch is OFF.

WH GT14 wiring.jpg



#10 KennyP ONLINE  

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Posted October 07, 2020 - 04:13 AM

Well I tried the Kohler K321S and it's a no-go. If this had been an SS/16 it would have worked I think.

DSCN5335.JPG   DSCN5336.JPG   DSCN5337.JPG

 

The battery/fuel tank tray won't let it come back far enough and it has the belt pulley for the clutch welded on the bottom of it.

 

Guess it will get the Predator.


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#11 KennyP ONLINE  

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Posted October 07, 2020 - 10:13 AM

After going back out this morning and looking things over with fresh eyes, I can move the Kohler back about 2.5-3". It will take some mods to the Sear parts (that I hate doing), but I can make this work. Just have to find a fuel tank location. Probably behind the seat.


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#12 KennyP ONLINE  

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Posted October 09, 2020 - 05:44 AM

I hope to get the new battery tray made today and see how far back I can move the engine.


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#13 DChappy OFFLINE  

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Posted October 09, 2020 - 10:39 AM

The battery/fuel tank tray won't let it come back far enough and it has the belt pulley for the clutch welded on the bottom of it.

 

Guess it will get the Predator.

Are you sure it's welded on? That doesn't sound right.


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#14 KennyP ONLINE  

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Posted October 09, 2020 - 01:04 PM

Are you sure it's welded on? That doesn't sound right.

Yes it is welded. I'll get a pic later.

 

I got started on the new battery tray. Cut 2 pieces of angle iron and got mounting holes drilled for them. Put the plate on top (needs trimmed some yet).

DSCN5338.JPG   DSCN5339.JPG DSCN5340.JPG

 

Welded that together along with a small angle for the back.

DSCN5341.JPG   DSCN5342.JPG

 

Slid the engine back after trimming the 'ears' for the old tray.

DSCN5343.JPG   DSCN5344.JPG

 

Right rear bolt hole would be impossible.

DSCN5345.JPG   DSCN5346.JPG

 

Then I looked at the front hole locations. Had to move the engine to the left side and back more to compensate for 'under' framework. This is where it will sit.

DSCN5347.JPG   DSCN5348.JPG   DSCN5349.JPG


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#15 KennyP ONLINE  

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Posted October 09, 2020 - 03:36 PM

Are you sure it's welded on? That doesn't sound right.

Here's a pic of the bottom of the tray.

DSCN5350.JPG


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