Jacobsen 321 powered Snow-Jet - Snowblower Forum : Snow Blower Forums
Reply
 
LinkBack Thread Tools
post #1 of 15 Old 01-12-2016, 08:01 PM Thread Starter
Junior Member
 
Join Date: Oct 2013
Posts: 5
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 1
Likes (Given): 0
Likes (Received): 2
Jacobsen 321 powered Snow-Jet

I have a snow jet 20" inch Jacobsen Model 52002, that I am currently working on.

The problem I have encounter is the governor linkage and its routing. The engine does run, but is running well beyond the rated 3800 RPM
spec. I have checked the following, 1) governor vane works freely, 2) No binding of carb link rod. 3) Governor lever & spring work and not tied up.

The 321 engine service manual covers the later version of this governor which is the plastic linkage arm & round throttle shaft used, somewhat similar to 501 horizontal snow burst engine. I wonder if there maybe a service manual supplement?? for this engine used on Snow Jet.

I am hoping someone would have a similar unit, that they could snap
a picture of governor linkage assembly set up, and how its to be assembled.

I ? the link attached on top of governor lever arm, looks possibly not original part. This is how It was found, before I took the carb off for some needed cleaning. Digital camera's make life a little simpler before stuff comes apart for repair work.
Attached Thumbnails
Click image for larger version

Name:	JACOBSEN 321 05.jpg
Views:	58
Size:	291.6 KB
ID:	71922   Click image for larger version

Name:	JACOBSEN 321 12.jpg
Views:	49
Size:	283.2 KB
ID:	71930   Click image for larger version

Name:	JACOBSEN 321 19.jpg
Views:	45
Size:	299.6 KB
ID:	71938   Click image for larger version

Name:	JACOBSEN SNO JET 321 14.jpg
Views:	43
Size:	306.0 KB
ID:	71946  
SnowPlow1 is offline  
Sponsored Links
Advertisement
 
post #2 of 15 Old 01-12-2016, 08:49 PM
Senior Member
 
Join Date: Feb 2015
Location: Wilmington, MA
Posts: 762
Post Thanks / Like
Thanks (Given): 9
Thanks (Received): 98
Likes (Given): 18
Likes (Received): 256
Oh man... I used to have a few of those I fooled around with, but it was 30+ years ago!

Referring to the image below, here's what I think needs to happen:

First, confirm for me the wire marked "A" is attached to the wire that goes between the vane and the throttle plate? If that's not true we may have to rethink this.

Otherwise... right now, linkage wires A, B, and C are all connected together at lever D. Wire C makes lever D move back and forth with the speed control lever, and because everything is connected together, that makes A move too which is connected to the throttle plate. The result being the throttle plate follows the motion of the lever and the governor doesn't do anything.

What I think needs to happen is disconnect wires B and A from lever D and connect them to each other. Edit: looking a little more closely, it appears they are already connected to each other, it's just there's an extra piece of wire connecting them to the top of lever D. So just remove that extra bit of wire.

What should then happen is the lever D will still follow the motion of the speed control lever. But instead of moving the throttle directly, it will apply a bending force to the spring located toward the bottom of the picture. The force from the spring will be transferred to the throttle through wires B and A. The governor will then be able to do its job, where the force on the vane balances out the force from the spring.

Did that make sense?
Attached Thumbnails
Click image for larger version

Name:	Image1.png
Views:	42
Size:	678.6 KB
ID:	71954  

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
1991 Ariens 924050 (ST824) "mama bear"
Toro PowerCurve 1800 "baby bear"

Be alert! America needs more lerts.
ELaw is offline  
Post Thanks / Like - 0 Thanks, 3 Likes, 0 Dislikes
Likes Grunt, bad69cat, bwdbrn1 liked this post
post #3 of 15 Old 01-12-2016, 10:38 PM
Senior Member
 
bad69cat's Avatar
 
Join Date: Nov 2015
Location: Cedar Rapids, Iowa
Posts: 1,236
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 87
Likes (Given): 127
Likes (Received): 275
agree - B and A don't look like factory bends any more? Somebody may have been doing their own thing....



bad69cat is offline  
post #4 of 15 Old 01-13-2016, 06:55 AM
Super Moderator
 
bwdbrn1's Avatar
 
Join Date: Nov 2010
Location: Upper Peninsula, MI Near Manisitque
Posts: 3,149
Post Thanks / Like
Thanks (Given): 553
Thanks (Received): 234
Likes (Given): 584
Likes (Received): 604
I think ELaw has hit upon your problem. That little extra twisted bit of wire in there connecting everything together at lever D just doesn't look right. Could be that the thought was that you could get extra power out of it by tying everything together.

I'm pretty much retired from the forum thing, but I check in every now and then.
bwdbrn1 is offline  
post #5 of 15 Old 01-14-2016, 09:48 PM Thread Starter
Junior Member
 
Join Date: Oct 2013
Posts: 5
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 1
Likes (Given): 0
Likes (Received): 2
Elaw

Wire A is connected to the Throttle Plate & Governor vane, so that is correct. Thanks for the illustrated photo, this should mostly like fix the problem. Since the spring on Wire "B" is already supported on Wire "A"
the (Wire Tie) on TOP of lever "D" does not need to act as support. Henceforth No governor action (Governor Over-Ride).


This would explain the added wire tie to lever "D" , I 'm thinking
someone was trying to correct a existing problem (Not enough RPM'S) and this was there solution (Wire Tie). When in fact they probably needed to
adjust the Governor Spring Tension to achieve the proper RPM setting.

To much midnight oil, makes one miss the obvious, thanks for extra eyes.
I hope to get back into by the weekend, will post the results of the fix.

Thanks to all! its appreciated.
SnowPlow1 is offline  
post #6 of 15 Old 01-15-2016, 07:15 AM
Senior Member
 
Join Date: Feb 2015
Location: Wilmington, MA
Posts: 762
Post Thanks / Like
Thanks (Given): 9
Thanks (Received): 98
Likes (Given): 18
Likes (Received): 256
Heh... not to be a downer but just so you're not unpleasantly surprised...

The problem the other person may have been trying to correct is that that is a really wussy engine!

I have a fondness for those machines since one was the first snowblower I ever used when I was young. But in anything more than a light snow, if I got the driveway done without stalling the engine 5-10 times it was a miracle! I'm sure some of it was just youthful impatience, but it's only a 3 horse engine and doesn't have a very good torque curve. So when you're snowblowing and it starts to bog down, you have to stop *immediately* or the engine will stall.

So I'm suspecting what happened is the previous owner rigged it for direct throttle control to try and get a bit more performance out of it.

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
1991 Ariens 924050 (ST824) "mama bear"
Toro PowerCurve 1800 "baby bear"

Be alert! America needs more lerts.
ELaw is offline  
post #7 of 15 Old 01-16-2016, 01:04 AM Thread Starter
Junior Member
 
Join Date: Oct 2013
Posts: 5
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 1
Likes (Given): 0
Likes (Received): 2
Thanks that's good info to have, also it being self propelled takes a little
more bite out of the engine Horsepower reserves.

Yes I could leave the governor the way it is, but it be my luck I'd forget 1 time, and buy, buy engine. So safe than sorry, especially when parts don't come by very easily for a 50yr old machine.

The real issue when I got this machine was it had a very leaky head gasket, due to the gasket failing & head bolts working loose over the years. Also the bottom hole of exhaust port was plugged solid. Besides a carb cleaning & inspection, replacing head & exhaust gaskets with new 1's. I decided to check points & condenser, found that the mag needed attention too. So new Points & condenser & spark plug. the basic tune-up.

I know some people laugh @ me, or are intrigued that the stuff I use
really works. That's why I like vintage stuff. especially the stuff you grew up with is now OLD! LOL:-)
SnowPlow1 is offline  
Post Thanks / Like - 0 Thanks, 2 Likes, 0 Dislikes
Likes classiccat, Grunt liked this post
post #8 of 15 Old 01-16-2016, 07:16 AM
Super Moderator
 
bwdbrn1's Avatar
 
Join Date: Nov 2010
Location: Upper Peninsula, MI Near Manisitque
Posts: 3,149
Post Thanks / Like
Thanks (Given): 553
Thanks (Received): 234
Likes (Given): 584
Likes (Received): 604
Gotta' love the old stuff. Those old 2 stroke Jake engines are just plain fun to listen to. I've got my eye out for one like yours, or better yet, one of their Snow Blitz contraptions.

I'm pretty much retired from the forum thing, but I check in every now and then.
bwdbrn1 is offline  
post #9 of 15 Old 02-01-2016, 11:22 PM Thread Starter
Junior Member
 
Join Date: Oct 2013
Posts: 5
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 1
Likes (Given): 0
Likes (Received): 2
Snow Jet Governor repaired

I Had chance today to get back into the Jake today. Here are
the updated pics of correct governor linkage set up. I removed the
(wire tie loop) off wire A and governor lever top hole were it was mounted
directly to lever. linkage moved freely without being taunt @ full throttle. I

Started the engine and governor now functions like it should.
I checked the RPM'S with my tach, idle and fast speeds are now within spec's. Thought you like an update with results. I not sure if I can post previous pics to this thread, sorry.

Thanks to Elaw, and other who helped. Thank You.
Attached Thumbnails
Click image for larger version

Name:	SNOW JET 321.jpg
Views:	43
Size:	308.4 KB
ID:	77065   Click image for larger version

Name:	SNOW JET 321-2.jpg
Views:	44
Size:	289.9 KB
ID:	77073  
SnowPlow1 is offline  
Post Thanks / Like - 1 Thanks, 0 Likes, 0 Dislikes
Thanks bwdbrn1 thanked for this post
post #10 of 15 Old 02-01-2016, 11:27 PM
Senior Member
 
Join Date: Nov 2013
Location: SW Ohio
Posts: 3,175
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 142
Likes (Given): 0
Likes (Received): 291
Sweet.

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
db9938 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










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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