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Old 06-05-2021, 07:24 PM   #1
danliveshere
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Default Houdaile oil

Hi guys Iím installing my 35 houdailes
I did a search but couldnít find the answer, what grade hydraulic oil should be used? They were rebuilt by Apple hydraulics.
Thanks Danny.
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Old 06-05-2021, 07:43 PM   #2
Rodrelic
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Default Re: Houdaile oil

I always thought 90w, probably not correct but I used modern 90-140 in mine but will caution one is leaking now, notrefurbished ‘46 shocks, after 10 years will research seal tolerances
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Old 06-05-2021, 07:50 PM   #3
danliveshere
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Default Re: Houdaile oil

I’ve sent Apple an email too but being a weekend I don’t expect a response till next week. Apple machine the case to use a different seal to original, I guess I may have to wait for their response. Dan.
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Old 06-05-2021, 08:26 PM   #4
Lawson Cox
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Default Re: Houdaile oil

Castor oil is what Henry used.
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Old 06-05-2021, 09:45 PM   #5
fordor41
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Default Re: Houdaile oil

I used hydraulic oil ISO 32 for years with good luck
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Old 06-06-2021, 04:09 AM   #6
35ragtop
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Default Re: Houdaile oil

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Hi Danny,
I was told to use Hydraulic jack oil, which is what I have used in my 48; project. When I bench tested them, it gave me a pretty solid resistance ,so I am happy with this result.
I think its about 10 w but I am often wrong,
Dave
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Old 06-06-2021, 09:49 AM   #7
rotorwrench
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Default Re: Houdaile oil

Ford and Who-Die used 8 different formulas of fluid before settling an the final formula around 1938. Mineral oil, glycerin, and castor oil were all used with varying mixes with alcohol & glycerin and varying viscosities of the different fluid formulas. The final formula was mineral oil with an approximate viscosity equivalent to SAE 50 motor oil. With mineral oil, there was a recommendation to open the fluid needle more during cold weather operation for model A cars.

In the modern era, a person may have to experiment with different viscosities of hydraulic oil to get a formula that works for their climate application. Hydraulic oil has anti foaming additives that would make it the best consideration for this design of shock absorber.
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Old 06-06-2021, 04:40 PM   #8
corvette8n
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Default Re: Houdaile oil

These were in my Dads garage, now in my shed, he used this in his bumper jack. I just noticed the Western Auto says not for houdaille shocks

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Old 06-06-2021, 06:07 PM   #9
1939mars
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Default Re: Houdaile oil

I was told 30 wt motorcycle fork oil by one of the rebuilders.
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Old 06-08-2021, 07:02 AM   #10
danliveshere
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Default Re: Houdaile oil

Thanks all. I got a reply back from Apple hydraulics. They send them out with AW-100 hydraulic oil. So that’s what I’ll use Thanks Dan.
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Old 06-08-2021, 10:59 AM   #11
rotorwrench
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Default Re: Houdaile oil

ISO-100 is approximately SAE-30.
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