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Onan JC Distributors


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  #1  
Old 09-07-2017, 11:13:25 PM
nothingbutdarts nothingbutdarts is offline
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Default Onan JC Distributors

I have about 3 JC distributors, all seem to have the advance mechanism rusted to the main shaft, I have managed to get one free, the others I have been heating the cam area with a hand held propane torch and then spraying with WD40, doing this a number of times and I still can't get the cam section to break free of the main shaft.
This dist. is pretty much just like a car distributor for those that have not seen the insides of one.
Looking for ideas the get these other two freeded up???
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  #2  
Old 09-07-2017, 11:23:59 PM
Dale Russell Dale Russell is offline
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Default Re: JC distributors

Try the Electrolysis process on them. Just might work. Some people swear by it.
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Old 09-07-2017, 11:40:44 PM
PnishrPW PnishrPW is offline
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Default Re: JC distributors

I'd change to using a true penetrating oil like Aerokroil or PB Blaster. WD40 aint gonna cut it... Electrolysis works awesome on "exposed" rust, less so on items rusted together.
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Old 09-08-2017, 12:09:40 AM
Power Power is offline
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Default Re: JC distributors

When penetrating oil and gentle persuasion did not work, I have been successful heating up and quickly putting in crushed ice. Sudden contraction makes rust bust into power. Sometimes it takes several cycles.
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Old 09-08-2017, 12:25:30 AM
AngrySailor AngrySailor is offline
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Default Re: JC distributors

Maybe try soaking in an acid bath for a bit if all else fails.
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Old 09-08-2017, 06:58:20 AM
KPack KPack is offline
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Default Re: Onan JC Distributors

You know we like pictures.
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  #7  
Old 09-08-2017, 08:53:46 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan JC Distributors

Not the best but, here are two.
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Old 09-08-2017, 09:09:23 PM
len k len k is offline
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Default Re: Onan JC Distributors

Could apply penetrating oil couple times a day for 2 weeks, did that on pistons. Krol (spelling) supposed to be good.

If it's really stuck cold works just as well as heat. You want max temp difference between the cold pin and the hot hole to get it to free up. On brake calipers I've warmed caliper with hairdryer then dripped cold freeze spray liquid (-40 deg F, upside down canned air) on breeder bolt so rubber seal in caliper won't be overheated and damaged. Have to work fast, small bolt warms FAST.

Can work the other way too to compress pin/stretch hole ( hot pin and cold hole) then keep piece with hole cold till pin cools somewhat. Then reverse it, cold pin and hot hole to try to open it up.

If -40 deg F freeze spray doesn't work, dry ice is -109 deg F, liquid nitrogen is -346 deg F, never had to use them. Use chemical safty glasses ( top and side shields) to prevent loss of sight from cold liquid splashes.

On Chevy exhaust manifold bolts I've heated manifold (threaded hole) yellow hot and cooled bolt with wet rag, can almost turn bolt out with your fingers ... careful of steam from rag, it burns fingers, had to wire it on a stick.

Last edited by len k; 09-09-2017 at 10:29:52 AM.
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Old 09-09-2017, 07:00:04 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan JC Distributors

I have also had good luck with a product called "Knocker Loose" from CRC or LPS, can't remember for sure who makes it. It seems like a very good penetrate.
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Old 09-09-2017, 07:16:26 AM
Gunny Gunny is offline
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Default Re: Onan JC Distributors

WD40 is pretty much useless for that problem. Try a penetrating oil, something designed for or formulated for that application. Kroil mixed 50/50 with ATF comes to mind also.
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  #11  
Old 09-09-2017, 10:02:11 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan JC Distributors

For right now I switched to PB Blaster and heat.
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Old 09-09-2017, 10:02:54 PM
dracer dracer is offline
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Default Re: Onan JC Distributors

you can make the best penetrating there is by mixing automatic transmission fluid and acetone in 50-50 mix
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Old 09-09-2017, 10:44:50 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan JC Distributors

Another question for the smart guys: In the parts book there are two different part numbers for a JC distributor, one number for a pressure cooled and another number for a Vac U Flow, what's up with that??? In the same parts book it the internal break down of the dist., all the parts are the same part numbers, however, for the bare housing there is no part number for either.
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Old 09-09-2017, 10:47:32 PM
Wayne 440 Wayne 440 is offline
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Default Re: Onan JC Distributors

Quote:
Originally Posted by dracer View Post
you can make the best penetrating there is by mixing automatic transmission fluid and acetone in 50-50 mix
+1 for the above. Another underappreciated benefit of that mixture is that it works well to set the item on fire with if you get tired of working on it.
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Old 09-11-2017, 12:11:26 PM
grif grif is offline
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Default Re: Onan JC Distributors

Quote:
Originally Posted by Wayne 440 View Post
+1 for the above. Another underappreciated benefit of that mixture is that it works well to set the item on fire with if you get tired of working on it.
A nice write up in Home Shop Machinist a few years ago about that mix. Something to be said for long soaks.

If you use dry ice,,, be careful. Makes things brittle at that temp.
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Old 10-28-2017, 01:34:59 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan JC Distributors

Well, after about 3 weeks of soaking the main shaft and advance mechanism in the 50/50 mix (which is mighty hard to keep mixed together mine you, it seperates quite easily, ATF and acetone) I tried turning the adv. mechanism again no go, light heat, still no go. Well I gave in and got the real torch out, a bit more heat on the advance mechanism and finally got it to turn, more and more, finally got it off the main shaft. I hope I haven't hurt the points cam area of the advance mechanism any. I put it in oil after getting it loose to try and quench it.
I'm thinking of a Pertronix pick-up in it anyway!
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