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Onan Generators

Onan 35.0SJB or Techstar 35G


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  #1  
Old 06-06-2006, 09:29 PM
Jim Davis Jim Davis is offline
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Default Onan 35.0SJB or Techstar 35G

I would appeciate it if you pro's would offer your opinions regarding the quality of this generator and the Chrysler H135 four cylinder engine. I tried a search but as always the search engine rejected "SJB".
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Old 06-06-2006, 11:49 PM
Denny B Denny B is offline
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Default Re: Onan 35.0SJB or Techstar 35G

The SJB, SKB and the Techstar's such as as the DL4B and DL6B ran @ 3600RPM and the service department despised them, the sales farce (oops!!) sales force thought they were great as they could sell a bigger unit more 'cost effectively'. I've rebuilt and replaced a lot of engines in these series. The 35G doesn't come to mind but I'm getting old and can't remember it all anymore. Jim if you have a 45EM stick with it. In the small commercial side of the line up they were one of the most reliable unit's Onan ever built.........Denny

Last edited by Denny B; 06-07-2006 at 01:37 AM.
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  #3  
Old 06-07-2006, 12:31 AM
Steve Dawkins Steve Dawkins is offline
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Default Re: Onan 35.0SJB or Techstar 35G

The Techstars were real screamers. At 3600 rpm, they sounded like they were about 50 rpm shy of flying apart. It hurt your ears to be near them. If my memory serves me correctly, they were available in 35 and 55 kW sizes. At the time, Onan's standard 1800 rpm units were available in 10 kW increments; 30,40,50,60 etc. so the 35 and 55 kW units were awkward sizes. The local distributor wasn't very fond of them.

Some years after they were out of production, I had a customer call me about hooking a Techstar diesel up at his house. He's a land developer, and had to upgrade a city owned sewage pumping station as part of a deal for one of his projects. He had salvage rights to the old equipment, so he grabbed the generator and transfer switch. He asked me to go to a staging yard and look at it for the suitability of installing it at his house. After seeing it was a Techstar, I explained to him why he didn't want it. Besides the maintenance issues, the neighbors would have tar and feathered him because of the noise.

You Onan guys can appreciate this next story. At that time, Onan liked to standardize things as much as possible. The OTII series transfer switches from 150 to 400 amps were all in the same size enclosure. (approx 30"w x 60"h x 20"d) This same developer had the 150 amp switch that came from the pump station. The guy was an avid hunter. I refused to install it in his garage next to the circuit breaker panel because he might try to use it as a gun cabinet. (LOL) A 150 amp transfer switch in a five foot tall enclosure does seem a bit silly. I talked him into selling the Techstar and OTII switch for what he could get for them and put the money into a good standby system. He's thanked me several times since then for talking him out of it.

Last edited by Steve Dawkins; 06-07-2006 at 12:43 AM.
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Old 06-07-2006, 07:13 AM
Jim Davis Jim Davis is offline
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Default Re: Onan 35.0SJB or Techstar 35G

I would not dream of replacing my 45EM. I have so many interested neigbors and co-workers I keep my eye out for auctions. The Don Hillman parts book says the SKB is a 3600 RPM 55KW and the SJB is an 1800 RPM 35KW. Even if it really is 1800 it does not sound like a series I would recommend. Thanks guys.
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Old 06-07-2006, 08:43 AM
Denny B Denny B is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Jim, The the SK was not one of the better ideas Onan ever had. The DL4 and DL6 were good units as they ran @ 1800. When Onan added a B at the end of the engine model it always indicated that they were screaming 90MPH units running @ 3600. I never liked to stand on the side of the things when the were in motion. If you ever watched the belts on these they were scary. I've been through many, many nightmares in the day time with all of the 3600 RPM units. I put more short blocks, or rebuilt more engines in these than anything Onan ever built. To make matters worse they were in to most inaccessible locations..........Denny
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Old 06-07-2006, 06:14 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Stay as far away as you can from the SK and Tech Star units.The SK has a very money hungry control system.The Tech Star will scare everything within five miles.I was at a job site when I had to check out my first tech unit.Did not read the tag.Hit the start switch and almost got ran over by all the mexicans trying to get out of the room.We all made it around the corner when it hit me that this was a 3600 rpm unit.Have another coustomer that installed one at his deer camp last year.He had it on a timer went to town for food and came back to see all the deer leaving the woods for other sites.No deer that year.
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Old 06-08-2006, 04:18 PM
Jim Davis Jim Davis is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Billy your post tickled my funny bone and I laughed out loud in my office. It was really hilarious, except I guess for the poor unforunates that own one of these units.
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Old 06-08-2006, 04:27 PM
Wayne 440 Wayne 440 is offline
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Default Re: Onan 35.0SJB or Techstar 35G

A friend of mine (briefly) owned one of those. It was a 33kw diesel set, and was so loud that it would make your teeth hurt. I went with him to pick it up and nearly had a heart attack when it cranked.
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Old 06-09-2006, 05:48 AM
Gunny Gunny is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Excellent advice. Stay away from those 3600 rpm units.
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Old 06-09-2006, 03:52 PM
Gunny Gunny is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Quote:
Originally Posted by Gunny
Excellent advice. Stay away from those 3600 rpm units.
Still better than a Generac!
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Old 06-09-2006, 06:31 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 35.0SJB or Techstar 35G

Thanks alot Gunny my day was going good until you said the G word.
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