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Jacobsen 4 Cycle Engine


I finally got myself a Jacobsen 4 cycle engine. It's no Briggs, but I still like it!:D Anyone have...

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  #1  
Old 06-16-2012, 10:15 PM
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Default Jacobsen 4 Cycle Engine

I finally got myself a Jacobsen 4 cycle engine. It's no Briggs, but I still like it!

Anyone have an original muffler they don't need?

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Old 06-17-2012, 10:57 AM
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Default Re: Jacobsen 4 Cycle Engine

Nice engine Junkologist!! Is that the Carb (Mixer) over the gastank?

Bigjoedo
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Old 06-18-2012, 04:32 PM
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Default Re: Jacobsen 4 Cycle Engine

Yes, the carb sits on top of the gas tank. The cylindrical part is the air cleaner. There is a bristle brush inside like a bottle cleaning brush. They are usually missing just like the shrouds are.
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Old 06-20-2012, 09:14 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Jacobsen 4 Cycle Engine

Nice running engine, and great find! The 4 strokes were only made for 3 years, and the dual mechanically operated valve ones, only one! Engine oiling issues were the fault of their demise! Most people who bought them were used to the 2 strokers, and did not bother to check the oil level, thus burning out the bronze con rod! Out of the eight 4 strokes I have seen, 4 were toast, due to have been run with no oil. One I had bought for parts actually had the con rod big end bearing beaten to about 1/4" oversize! There was virtually no oil in the crankcase!
Andrew
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Old 06-21-2012, 10:21 AM
Larry Caskey Larry Caskey is offline
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Default Re: Jacobsen 4 Cycle Engine

A couple pics and a video of my Jacobsens. The one on the left is the single pushrod Jacobsen Junior, the other one is the double pushrod Jacobsen Putting Green mower.

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Old 06-24-2012, 04:17 PM
Everett Hayden Everett Hayden is offline
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Default Re: Jacobsen 4 Cycle Engine

Hey Andrew,
I just got the single rocker style still on the "Junior" style mower like Larry's.As a result I was refered to an ex Jacobsen employee who had at least one example of every mower Jacobsen built. He also had a list of serial # production dates, which showed my mower as a 1926. I will try and get a copy from him but I think that list showed a longer production time. Could be I am "misremembering" but I do remember it showing over 3000 of the single rockers and 1xxx of the twin rockers.
The mufflers are scarce as hen's teeth he says. My mower needs the starting crank and holder. Some one converted it to rope start so, it's always something, ya know!!!
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Old 06-25-2012, 10:07 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Jacobsen 4 Cycle Engine

I have a master manual from Jacobsen. If you PM me the mower number, I can verify the date. The manual has no engine data on either the early 2 strokers nor either of the early 4 stroke engines. I got my info from several sources, and being that these engines were made over 80 years ago, there could always be errors in memory. Too bad that Jacobsen only put the S/N info on the mowers. Quite a few engines cannot be dated as Jacobsen did not keep data on the engines themselves, only the equipment it was mounted on. The 4 strokes were not all that popular, and were produced along with the 2 stroke engines. Jacobsen also built a 2 stroke twin! I have never seen one in person, but have seen advertising on it. Sure would like to see one in person!
Andrew
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Old 06-25-2012, 10:27 AM
Doug Tallman Doug Tallman is offline
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Default Re: Jacobsen 4 Cycle Engine

There was a 2 stroke twin at the Portland swap last May. It was the first I'd seen or heard of one. It was just an engine only without a mower. Never did hear what he was asking for it.
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Old 07-09-2012, 11:16 PM
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Default Re: Jacobsen 4 Cycle Engine

I picked up this 19 inch putting green mower this past weekend. It needs a lot of work. Hopefully, I'll be able to make a video of it running one day! Does anyone else have one of these engines with a muffler like the one on this mower??
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everett briggs jacobsen putting green mower 30hp foos 018.jpg   everett briggs jacobsen putting green mower 30hp foos 019.jpg   everett briggs jacobsen putting green mower 30hp foos 020.JPG   everett briggs jacobsen putting green mower 30hp foos 021.JPG  

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Old 08-12-2012, 06:18 PM
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Default Re: Jacobsen 4 Cycle Engine

Well, thanks to Everett and a parts engine he supplied, I got the putting green mower running today. I had to use the cylinder, piston, rod, crankshaft, cam, and gas tank from the parts engine. Everything else is original to the mower. Not a real good design the way the crankcase splits in half around the main bearings. Hard to get it sealed up and keep the bronze mains tight.

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Old 08-13-2012, 02:29 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Jacobsen 4 Cycle Engine

Nice liiking mower! I will try to get a date for you from my manual. The muffler is of a different design from the ones I ususaally see on the jackbsens - they are usually a sectional muffler with 4 sections.
Andrew
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Old 08-14-2012, 02:38 PM
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Default Re: Jacobsen 4 Cycle Engine

Andrew,
It would be great if you could verify the year built of my mower. The number is P7-167-8. I wonder if it could be the 167th one built in 1928?
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Old 08-14-2012, 09:05 PM
Everett Hayden Everett Hayden is offline
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Default Re: Jacobsen 4 Cycle Engine

Dang Mike, that makes me really happy to see your mower running.
I love old engines and am glad that parts engine is back on a mower. Thanks for sharing the video.

Everett

Last edited by Everett Hayden; 08-14-2012 at 09:06 PM. Reason: Better wording used.
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Old 08-20-2012, 01:36 PM
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Exclamation Re: Jacobsen 4 Cycle Engine

Junkologist, your Jacobsen Putting Green Mower was built in 1928. Apparrently, these mowers were not too popluar, as production seems to be low for these units. I'm guessing that as a specialty unit, sales were not that great. 1928 was not a good year for them, as only 19 19" Putting Green Mowers were built that year! That's right, only 19 units! Rare bird indeed, and seeming in good shape too! Keep an eye on oil level - the 4 stroke Jacobsens don't like to run on low oil!
Andrew
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Old 11-09-2012, 01:10 PM
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Default Re: Jacobsen 4 Cycle Engine

Quote:
Originally Posted by Junkologist View Post
I finally got myself a Jacobsen 4 cycle engine. It's no Briggs, but I still like it!

Anyone have an original muffler they don't need?

Nice engine Junkologist. I have exactly the same engine. I posted a question and pictures of it restored back on 01-22-2012 " in this forum. Got all kinds of help. In fact, that was what prompted me to join the forum.

Once again, nice motor. Still have mine and I crank it up occasionally to show it off. People are really amazed something so old runs so good.

Have a good one.
Dave
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Old 11-09-2012, 01:15 PM
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Default Re: Jacobsen 4 Cycle Engine

I have one of those been looking for a shroud for it anyone have one that you know of?
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Old 12-22-2012, 04:47 PM
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Default Re: Jacobsen 4 Cycle Engine

I just picked up a single rocker Jacobson today It has the outer part of a clutch from a putting green mower on it. It is compete with origional muffler, shroud, and airceaner. Il have pics and Maybe a vidieo tomarrow or Monday.
-Greg
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Old 12-23-2012, 05:19 PM
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Default Re: Jacobsen 4 Cycle Engine

heres some pics. i got it running today. Il try to have the vidieo soon.
-Greg
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Old 12-23-2012, 08:34 PM
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Default Re: Jacobsen 4 Cycle Engine

heres the vidieo
-Greg
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Old 02-13-2013, 12:14 PM
Larry Caskey Larry Caskey is offline
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Default Re: Jacobsen 4 Cycle Engine

Isn't a 4 cycle, but figured this was the best thread to post it in. Just picked up this Jacobsen 2 cycle estate mower a few days ago.
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