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Author Topic: Jensen 10 with leaky throttle  (Read 818 times)

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Jensen 10 with leaky throttle
« on: March 22, 2023, 12:20:26 pm »
Good afternoon from Brooklyn...

  I have a Jensen 10 that runs pretty well now that
I have 'super-glued' the cylinder crack (mostly ok
now).  It will build more pressure and power the light
better, but now it appears the steam line throttle is
spritzing away some of my precious pressure. 

  If anyone out there has cured this problem before,
please let me know how you did it.  This is too nice
an engine setup for me to risk ham-fisting it.

Thanks,
Wayne
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Re: Jensen 10 with leaky throttle
« Reply #1 on: March 22, 2023, 02:56:11 pm »
Easiest thing I do is lift the valve slightly and put a drop of steam cylinder oil on it, then sort of twist it back and forth as it is pushed back down into its properly seated position. If it is really bad, I will use a bit of fine lapping compound to lap it into a better seat in the valve body. Don't know if I've ever had a Jensen steam valve that didn't leak at least a drop or three during a run, but you should be able to make it so it is not leaking a jet of steam.

Hope that helps.
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Re: Jensen 10 with leaky throttle
« Reply #2 on: March 22, 2023, 03:54:25 pm »
  Thanks for the advice.  I checked out the valve and
now realize that it can be raised just enough to get a
bit of steam oil in there without making a mess.  I'll
find a hypodermic with a finer tip to ensure the oil
flows in as it may be a good way to get some oil into
the cylinder to start a run on any Jensen.  So simple.

  I'll do a follow up in a bit.

Thanks,
Wayne
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Re: Jensen 10 with leaky throttle
« Reply #3 on: March 22, 2023, 08:45:13 pm »
I believe that Jensen used Crest toothpaste( or any toothpastes with whiteners) to lap the throttle in the bore, I have done this as well (for fine leak applications),but its a mess to clean out of there.
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Bruce, St. Paul Indiana, USA
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Re: Jensen 10 with leaky throttle
« Reply #4 on: March 23, 2023, 12:05:41 am »
I think that Ultrabright has the most grit. You want the abrasive, not the bleach that most newer ones use.
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John

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Re: Jensen 10 with leaky throttle
« Reply #5 on: March 23, 2023, 06:15:42 am »
here is a list I found...
Relative Dentin Abrasivity (RDA) is a method of measuring the erosive effect of abrasives in toothpastes on tooth dentin. This value is necessary for FDA approval of the toothpaste but is usually not required to be disclosed on the label. In order to be FDA approved, the RDA must be 200 or lower. It is recommended to use a toothpaste with a RDA of 70 or lower. The lower the number, the less enamel/dentin will be worn away. The best way to know your toothpaste’s RDA is to ask the company. Here is a chart to help in understanding what the number means:

Table:

Low Abrasive:                                    0-70

Medium Abrasive:                           70-100

Highly Abrasive:                                100-150

Regarded as Harmful Limit:          150-250

 

This chart lists some common toothpastes that can be found in stores or online with their RDA value. This chart is courtesy of Kois Center located in Seattle, WA.

Abrasiveness Index of Common Toothpastes:

(RDA#- Toothpaste Brand Name)

0- Livionex

4- Toothbrush with Plain Water

7- Plain Baking Soda

8- Arm & Hammer (A&H) Tooth Powder

15- Weleda Salt Toothpaste

18.5- CariFree CTx4 Gel 1100/5000

18.5- CariFree CTx3 Gel

30- Elmex Sensitive Plus

30- Weleda Plant Tooth Gel

34- Pronamel

35- A&H Dental Care

40- Weleda Children’s Tooth Gel

42- A&H Metadent Advance Whitening

44- Squiggle Enamel Saver

45- Weleda Calendula Toothpaste

45- Weleda Pink Toothpaste with Ratanhia

45- Oxyfresh

48- A&H Dental Care Seneitive

49- Tom’s of Maine Sensitive

49- A&H Peroxicare Tartar Control

51- Crest with Scope

52- A&H Peroxicare Regular

52- Healthy Teeth & Gums

53- Rembrandt Original

53- Closys

54- A&H Dental Care PM Bold Mint

57- PerioSciences White Care

57- Tom’s of Maine Children’s

60- Biotene Gel

62- Clinpro 5000

62- Supersmile

63- Rembrandt Mint

65- Colgate Prevident 5000 Plus

65- Colgate Enamel Care Advance White

65- Crest with Scope Whitening

68- Colgate Regular

70- Colgate Total

70- A&H Advance White Sensitive

70- Colgate 2-in1 Fresh Mint

74- Crest Rejuvenating Effects Liquid Gel

75- Prevident 5000 Booster

79- Sensodyne

80- Aim

80- Biotene Paste with Fluoride

83- Colgate Sensitive Max Strength

91- Aquafresh Sensitive

93- Tom’s of Maine Regular

94- Rembrandt Plus

94- Plus White

95- Oxyfresh with Fluoride

95- Crest Regular

97- Oxyfresh Powder

100- Colgate Enamel Care Natural White

100- Colgate Optic White

101- Natural White

103- Mentadent

103- A&H Sensation

104- Sensodyne Extra Whitening

106- Colgate Platinum

106- A&H Advance White Extreme White

107- Crest Sensitivity Protection

109- Topex ReNew

109- Colgate Tartar Control w/ Baking Soda

110- Colgate Herbal

110- Amway Glister

113- Aquafresh Whitening

117- A&H Advance White Gel

117- A&H Sensation Tartar Control

117- Fluoridex Daily Defense

120- Close Up with Baking Soda

120- Crest Extra White w/ Tartar Protection

124- Colgate Whitening

126- Crest Maximum Sensitivity

130- Crest Extra Whitening

133- Ultra Brite

139- Crest MultiCare Fresh Mint

140- Crest Pro-Health

144- Crest MultiCare Whitening

145- Colgate Baking Soda Whitening

146- Ultra Brite Advanced White Formula

150- Pepsodent

155- Crest Rejuvenating Effects

165- Colgate Tartar Control

175- Colgate Luminos

200 -Colgate 2-in-1 Tartar Control/White

200- FDA Recommended Limit

250- ADA Recommended Limit
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Bruce, St. Paul Indiana, USA
"Originality thrives in seclusion free of outside influences beating upon us to cripple the creative mind."
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Re: Jensen 10 with leaky throttle
« Reply #6 on: March 23, 2023, 11:14:07 am »
  Thanks Bruce, that is a great list.
If I'm in a pinch I can use it to pick
my poison.

 As an occasional lapidary I have plenty
of experience with abrasive pastes for
shaping, for the most part, hard agates
and rutilated quartz.  Grits from 240
to 100,000, anyone?

  I have yet to try anything other than
the injection of steam oil into the valve.
I'll test that tonight.  I could also
tighten the spring a bit like I did in the
S/V.  I'd like to put off disassembling
the valve as it appears to be neccessary
to file the bottom of the shaft first.
That is a permanent change and a last resort
in my book.

Thanks,
Wayne
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