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Author Topic: Jensen #5 missing perhaps the most important part!  (Read 2604 times)

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Jensen #5 missing perhaps the most important part!
« on: July 07, 2025, 11:00:09 pm »
If any of you happen to use Facebook marketplace, you may have seen this one. I work nearby and swung by after work today, seller was willing to go way low because he wouldn't have to ship. But it's missing it's piston! Tragic really, when I got home and realized that the model 60 piston is not even close to the same! I am wondering about the piston on the 70, as it is double acting. If anyone has leads on a replacement piston, or is willing to try swapping a piston from a 70 to a 5, I would love to hear either way! [ Guests cannot view attachments ] [ Guests cannot view attachments ]
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Re: Jensen #5 missing perhaps the most important part!
« Reply #1 on: July 08, 2025, 01:26:37 pm »
That is a tough nut to crack.

  Unfortunately, Jensen has no replacements at this time.  You may
have to buy one in worse shape but with a cylinder/piston/rod assembly. 

  I bought a 1951 Jensen #10 with a rough but working boiler.  Then, I bought
a #5 with a good boiler, swapped the boilers, and sold the donor on ebay.
If you part the donor out you may get most of your $$$'s back.  Someone is
always looking for a whistle, S/V, sightglass assembly, and whatever else
can be detached.

Good Luck,
Wayne
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Re: Jensen #5 missing perhaps the most important part!
« Reply #2 on: July 08, 2025, 01:46:34 pm »
I'm looking for that size heater and firebox if you decide to part it out.
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Re: Jensen #5 missing perhaps the most important part!
« Reply #3 on: July 08, 2025, 03:47:33 pm »
Whoa...there you go.  I'd be willing to bet parting it out, though it would
take time, would yield a decent return.  Maybe enough to get your parts for
free.

Good Luck,
Wayne
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Re: Jensen #5 missing perhaps the most important part!
« Reply #4 on: July 08, 2025, 03:51:45 pm »
Amongst this community, I'd think the odds of sourcing a piston/cylinder for that otherwise fairly nice-looking engine are at least fair to middling!
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Re: Jensen #5 missing perhaps the most important part!
« Reply #5 on: July 08, 2025, 06:34:48 pm »
I think a #70 or #35 may work, i'll look around.
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Re: Jensen #5 missing perhaps the most important part!
« Reply #6 on: July 08, 2025, 11:35:43 pm »
These cylinders split often, so probably quite a few missing.
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Nick

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Re: Jensen #5 missing perhaps the most important part!
« Reply #7 on: July 09, 2025, 08:08:27 am »
Crossing my fingers on the 70 or 35 pistons working! If it seems like it can be swapped I will probably find a cheaper donor 70! If not, I will probably sell the boiler/firebox, and hold onto the cast iron engine base to make my own piston. Trust me when I say I am trying to put the right parts on this haha, but you gentlemen seem to enjoy bidding on ebay Jensens hahaha!
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Re: Jensen #5 missing perhaps the most important part!
« Reply #8 on: July 10, 2025, 09:59:14 am »
Check this out on Ebay .  Might be something you could use . 

https://www.ebay.com/itm/317066796109?
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D. E. Jones

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Re: Jensen #5 missing perhaps the most important part!
« Reply #9 on: July 11, 2025, 05:47:35 pm »
thanks for looking out! I'm actually looking at: https://ebay.us/m/yM1lAC   

 @parallelmotion, if you would be interested in splitting up an engine, I would put 40 towards the piston, and you can keep the rest!
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Re: Jensen #5 missing perhaps the most important part!
« Reply #10 on: July 11, 2025, 05:51:15 pm »
Thanks for the offer but I don't have one to part out--looking for a heater and firebox.
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Re: Jensen #5 missing perhaps the most important part!
« Reply #11 on: July 11, 2025, 08:17:32 pm »
I was suggesting either you or I buy the ebay engine I posted, and sell the other parts to the other person, you would get the firebox/heater, and I would get a piston, for about 40 a person
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Re: Jensen #5 missing perhaps the most important part!
« Reply #12 on: July 11, 2025, 09:38:18 pm »
Sorry I misunderstood. I think with taxes and shipping (from you to me) it's going to be a bit more than $40, so I'll have to pass.
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Re: Jensen #5 missing perhaps the most important part!
« Reply #13 on: July 26, 2025, 10:48:47 am »
Well I made an offer on a Jensen 35, and got it in hand! I sure know how to pick em! Big old crack in the cylinder. Bummer! @parallelmotion, I have a heater and firebox for you, shoot me a DM. Upside is, I have a complete no.5 that just needs a crack soldered and some cleaning!
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Re: Jensen #5 missing perhaps the most important part!
« Reply #14 on: July 26, 2025, 11:05:59 am »
  Sorry about the crack.....I've seen worse.
I had an engine with a cracked cylinder.
I was advised that super glue is a good
alternative so I tried it with success.  Just
be careful of the piston's position.  I don't
think the glue will make it all the way in. 
Just don't flood it with glue - less = no mess!

  Or, call Jensen and ask to speak with Andy.
He does a great job of soldering engine parts.
I had a cylinder that split off the steam chest
and the prior owner tried ??? to glue it together.
A real mess.  Andy took the whole engine and fixed
it perfectly. It is now a sweet runner.

Good Luck,
Wayne
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