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Sears SS twins and singles same except for engine?


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#1 Tennblue59 OFFLINE  

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Posted November 10, 2015 - 08:52 PM

Working on the SS16 with the onan engine. Just got the carb rebuild kit and going through the engine. Whole thing is torn apart to do paint and fix the grill as well, but making progress.

My question - mostly just curiosity... - did sears offer a tractor that uses the same frame and running gear as the ss16 twin, but with a single cylinder engine?

If I HAD to repower, looks like there are plenty of options with the way power comes off the motor. I have a couple kohler K singles (14 and 16 hp's) laying around as well as a briggs 16hp twin. Pretty sure the onan will breath again, but seems like I always am thinking about "what would fit in there???" smile...
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#2 EricFromPa OFFLINE  

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Posted November 10, 2015 - 10:14 PM

I think All suburbans used the same frame and transaxle except the Hydro suburbans those had a different rear frame section.The SS14 and SS15 have 14 and 15hp Cast iron Briggs engines in them.They also had the Tabs on the frame for the wider engine mounts.

 

Opposed twin briggs should be a direct replacement.Roper put a 16hp opposed twin in the 16T which is basically the same as the Sears SS16 but with a different engine and slightly different Grill.

SAM_2811.jpg

 

 

 

Here is one that someone put a 14hp Kohler K321 into.


Edited by EricFromPa, November 11, 2015 - 02:17 AM.

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#3 TAHOE OFFLINE  

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Posted November 11, 2015 - 08:07 AM

Eric pretty much summed it up, basically same frames with the twins having the frame tab for the wider mounting bolts. Sears did try a 16 Hp Briggs twin in a 78 I believe, they are pretty rare though as that was first year for the twin Briggs and they had some oiling issues so many got blown up from low oil.

The ST12 & ST16's were single cyl Tecumsehs.

 

You can "fit" about whatever you want in one, it's just how much fab work do you want to do. If you would ever want to go single diesel, look up fearlessfront on youtube, he built a super cool 10 Hp diesel he uses as a mudder. 

 

If you need to do a frame swap, try to find one from 73-74, it was either in 75 or 76 Roper thinned the front frames down a hair, I've seen on some forums that quite a few get cracks were they bolt up to the back half.  


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#4 craftsmanmowerfreak OFFLINE  

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Posted November 11, 2015 - 08:40 AM

now i been messing around with frames. the tec powred subs have taller front frames. the onan, and briggs dont sit has tall. measure them with a ruler and you will see


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#5 JiminRI OFFLINE  

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Posted November 17, 2015 - 12:58 PM

I've been working on a parts commonality table for use when I need parts for my SS-16 (16 hp Onan Twin). I downloaded several manuals and put together a table in Excel. Below is an excerpt from that table showing the front and rear frame pieces across several models including the 1973 SS-16 and the same year ST-16 (16 hp Tecumseh).  The rear frame is the same, but the front (Engine Mount Assembly) is different so some fabrication may be needed to mount the Tecumseh in the SS-16.

 

 

Part                                                               SS-16       ST-16      ST-12      Sub 15 or SS-15

 

Frame - Engine Mount Assembly          634A531 634A544 634A782    pg missing

Frame - Chassis Assembly w Bearings  634A543 634A543 634A781    634A495


Edited by JiminRI, November 17, 2015 - 01:02 PM.

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#6 KennyP ONLINE  

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Posted November 17, 2015 - 01:09 PM

I've been working on a parts commonality table for use when I need parts for my SS-16 (16 hp Onan Twin). I downloaded several manuals and put together a table in Excel. Below is an excerpt from that table showing the front and rear frame pieces across several models including the 1973 SS-16 and the same year ST-16 (16 hp Tecumseh).  The rear frame is the same, but the front (Engine Mount Assembly) is different so some fabrication may be needed to mount the Tecumseh in the SS-16.

 

 

Part                                                               SS-16       ST-16      ST-12      Sub 15 or SS-15

 

Frame - Engine Mount Assembly          634A531 634A544 634A782    pg missing

Frame - Chassis Assembly w Bearings  634A543 634A543 634A781    634A495

That's cool! Makes it easy find parts!


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#7 TAHOE OFFLINE  

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Posted November 17, 2015 - 03:01 PM

now i been messing around with frames. the tec powred subs have taller front frames. the onan, and briggs dont sit has tall. measure them with a ruler and you will see

 

That would also make sense as to why the Onan's usually have a lower grill spacer under it.

 

 

Just need to drill a couple holes to mount the Tecumseh and you should be fine.


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#8 Marlin1963 OFFLINE  

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Posted November 20, 2015 - 11:03 AM

Another difference I have found on some of them,  on my GT18 (917.257112) it has a little angle bracket that is on the forward battery shield bracket  and on my ST16 (917.25961) the battery shield bracket doesn't have this, I need to do some checking so I'm ok in height with the Frankenstein dash here's what I mean in these pics. I'll add more pics of the differences in just a bit, I need to snap some close ups of the ST16.

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#9 Marlin1963 OFFLINE  

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Posted November 20, 2015 - 11:23 AM

Here's the ST16 battery shield, Both of these tractors were born with Onan Twins and the same cheap plastic dash so I'm not sure why they would do this, another thing to wonder about.

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