Repowering Questions, OHSK130 ->Pred 420cc - Snowblower Forum : Snow Blower Forums
Reply
 
LinkBack Thread Tools
post #1 of 25 Old 03-06-2017, 12:46 PM Thread Starter
Junior Member
 
Join Date: Mar 2017
Posts: 11
Post Thanks / Like
Thanks (Given): 16
Thanks (Received): 0
Likes (Given): 2
Likes (Received): 0
Repowering Questions, OHSK130 ->Pred 420cc

I currently own a Yard-Man 31AE993I401. It's 33" and uses a Tecumseh OHSK130. 358cc, 13hp. I installed Clarence's paddle kit a few years ago and recently come across gasoline leakage (more than usual) and oil seepage (again). Both are repairable. However, the engine is tired and these repairs are getting a little long in the tooth.

In any case, I'm considering the re-power route. I've looked at B&S and LCT. B&S is not cheap and will require some modification to the engine mounting locations. The LCT is cheaper and will require a bit more modification, I think, as not only is the mounting location different (as is with the Briggs) but also, the crankshaft height is taller. That is, the height of the crankshaft in reference to the base of the engine. Dimension-ally, the Predator 420cc (13hp) is the same as the LCT but much cheaper.

Concerning these items:
- what are y'all thoughts about addressing a higher crankshaft? This raises the drive pulleys. Longer belts?
- any concerns about how to mount a new engine? I figure I can cut a piece of 3/16 plate, drill and tap it to sandwich the base (top) of the drive unit and engine.
- do y'all think the Predator 420cc is a good candidate?

Thanks all in advance.
gbodybilly is offline  
Sponsored Links
Advertisement
 
post #2 of 25 Old 03-06-2017, 01:52 PM
Senior Member
 
tpenfield's Avatar
 
Join Date: Feb 2015
Location: Massachusetts
Posts: 1,042
Post Thanks / Like
Thanks (Given): 48
Thanks (Received): 56
Likes (Given): 127
Likes (Received): 191
Garage
Longer belts would do the trick for the taller crankshaft height. Since you are staying in the same cc/HP range, you probably will want to leave the pulleys as is. Make sure the crankshaft of the replacement engine is going to be compatible with the pulleys. etc.

The chassis of the Yard-Man should have several hole patterns. Hopefully one of the patterns will fit the new engine. You can always take the old engine off for a look and some measurements.

The Predator engines are OK, although I have no direct experience with the 420cc. The 212cc is the real value leader. The other size engines are not as price competitive, so you may be able to get another brand at a good sale pricing. Common issues with the Predators are the lack of after the sale support for parts, etc. Often, those issues can be overcome with a little bit of searching around.

Regards, Ted
.
Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
tpenfield is online now  
post #3 of 25 Old 03-06-2017, 02:38 PM Thread Starter
Junior Member
 
Join Date: Mar 2017
Posts: 11
Post Thanks / Like
Thanks (Given): 16
Thanks (Received): 0
Likes (Given): 2
Likes (Received): 0
Thanks for that. However, the engine base and bolt pattern on the OHSK is narrower and shorter than the Predator 420cc. As such, I would have to mock something up.

As far as pulley height is concerned, the Predator's crank to engine base height is 0.75" taller. The calculation I'm using is as follows:

[(D1 +D2)*(1.6)] + [(C1 to C2)*(2)] = drivebelt length,

where, D1 is the diameter of 1 pulley,
D2 is the diameter of the other pulley,
C1 to C2 is the distance between the center of the pulleys

I don't foresee an issue with utilizing the original pulley as the output shafts are the same size. As such, using the equation stated, with D1 and D2 being the same and (C1 to C2) increasing by 0.75, the belts I would need would have to be 1.5" longer. However, this does not account for any belt tension variation nor the idler pulley. But I won't know that until I get the new engine on there.

Last edited by gbodybilly; 03-06-2017 at 06:17 PM.
gbodybilly is offline  
post #4 of 25 Old 03-06-2017, 07:34 PM
Senior Member
 
Kensico's Avatar
 
Join Date: Feb 2014
Location: White Plains NY 10603
Posts: 113
Post Thanks / Like
Thanks (Given): 24
Thanks (Received): 9
Likes (Given): 37
Likes (Received): 14
Briggs Horizontal Engine 21.00 TP 420cc 1" x 3-21/32" #25T232-0118 | eBay

Don't know if this engine would help you it's from Brand New Engine on eBay.
Kensico is offline  
Post Thanks / Like - 1 Thanks, 0 Likes, 0 Dislikes
Thanks gbodybilly thanked for this post
post #5 of 25 Old 03-06-2017, 07:54 PM
Senior Member
 
Kensico's Avatar
 
Join Date: Feb 2014
Location: White Plains NY 10603
Posts: 113
Post Thanks / Like
Thanks (Given): 24
Thanks (Received): 9
Likes (Given): 37
Likes (Received): 14
Kensico is offline  
Post Thanks / Like - 1 Thanks, 0 Likes, 0 Dislikes
Thanks gbodybilly thanked for this post
post #6 of 25 Old 03-06-2017, 08:16 PM
Senior Member
 
Kensico's Avatar
 
Join Date: Feb 2014
Location: White Plains NY 10603
Posts: 113
Post Thanks / Like
Thanks (Given): 24
Thanks (Received): 9
Likes (Given): 37
Likes (Received): 14
Mount-BS-Tec

Also this may help if you go with Briggs
Kensico is offline  
Post Thanks / Like - 1 Thanks, 0 Likes, 0 Dislikes
Thanks gbodybilly thanked for this post
post #7 of 25 Old 03-06-2017, 08:35 PM
Senior Member
 
Normex's Avatar
 
Join Date: Feb 2014
Location: Near Ottawa Ont
Posts: 1,371
Post Thanks / Like
Thanks (Given): 52
Thanks (Received): 85
Likes (Given): 27
Likes (Received): 82
I agree with Kensico for the winterized LCT engine which the Predator is not winterized, you can download the measurements of the holes for the LCT and as for the auger belt lenght normally it takes a belt, 2" longer for every inch of height higher,as for the
drive you would need approx. 4" longer and lastly the idler pulley normally are adjustable for tightening the auger belts.

Good Luck

Norm

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
Normex is offline  
Post Thanks / Like - 1 Thanks, 1 Likes, 0 Dislikes
Thanks gbodybilly thanked for this post
Likes Grunt liked this post
post #8 of 25 Old 03-06-2017, 08:40 PM
Senior Member
 
Normex's Avatar
 
Join Date: Feb 2014
Location: Near Ottawa Ont
Posts: 1,371
Post Thanks / Like
Thanks (Given): 52
Thanks (Received): 85
Likes (Given): 27
Likes (Received): 82
Just a quick note for the B&S is they don't have cast iron sleeves for longevity.
The LCT engines has cast iron sleeves.

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
Normex is offline  
Post Thanks / Like - 1 Thanks, 0 Likes, 0 Dislikes
Thanks gbodybilly thanked for this post
post #9 of 25 Old 03-07-2017, 01:15 PM
Senior Member
 
drmerdp's Avatar
 
Join Date: Feb 2014
Location: Northern NJ
Posts: 1,287
Post Thanks / Like
Thanks (Given): 6
Thanks (Received): 143
Likes (Given): 24
Likes (Received): 294
I'd go LCT as well. Electric start, lighting coil, plus proper shielding for snow and ice and jetting for less then a 420 predator.

The LCT engines have a very good track record of reliability.
drmerdp is offline  
post #10 of 25 Old 03-08-2017, 09:30 AM Thread Starter
Junior Member
 
Join Date: Mar 2017
Posts: 11
Post Thanks / Like
Thanks (Given): 16
Thanks (Received): 0
Likes (Given): 2
Likes (Received): 0
Quote:
Originally Posted by Kensico View Post
Briggs Horizontal Engine 21.00 TP 420cc 1" x 3-21/32" #25T232-0118 | eBay
Don't know if this engine would help you it's from Brand New Engine on eBay.
That's a good price for that brand/engine.

I have looked at LCT. The "issue" with them is that, dimension-ally, it has the same engine mounting bolt pattern as the Predator as well as the crankshaft height. However, I didn't find them at that price! Thanks for that!

Quote:
Originally Posted by Kensico View Post
Mount-BS-Tec
Also this may help if you go with Briggs
Yes, if I was going the Briggs route, I would buy this to resolve both the bolt mounting issue and the height issue. The Briggs crankshaft height is actually lower than the Tecumseh. This adapter plate would bring the engine up to the OHSK's crank height. It's definitely the more direct fit than any option I see right now but at a bit more money.

Quote:
Originally Posted by Normex View Post
I agree with Kensico for the winterized LCT engine which the Predator is not winterized, you can download the measurements of the holes for the LCT and as for the auger belt lenght normally it takes a belt, 2" longer for every inch of height higher,as for the
drive you would need approx. 4" longer and lastly the idler pulley normally are adjustable for tightening the auger belts.

Good Luck

Norm
Thanks, Norm. The LCT is dimension-ally identical to the Predator, so that remains an issue. However, at that $169.95, it undercuts the cost of the Predator..! As for drive pulley lengths, I was using a calculation for an old machinists handbook. it's good enough for a ballpark measurement, but as you mentioned, there is some adjustment in tensioning. It come down to actually fitting everything until I can take a proper measurement.

Quote:
Originally Posted by drmerdp View Post
I'd go LCT as well. Electric start, lighting coil, plus proper shielding for snow and ice and jetting for less then a 420 predator.

The LCT engines have a very good track record of reliability.
Yes, I did investigate LCT as they did buy out parts of Tecumseh, I was hoping for a drop in replacement. The retailer I've located didn't seem to offer them for less than the cost of the Predator.

Thanks for the input and suggestions, all. Keep them coming,
gbodybilly is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Snowblower Forum : Snow Blower Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in













Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome