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#32660 - 12/09/06 03:09 PM Best way to flush a converter?
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
After wiping out a rear drum support on my spare 727, I need to know how to do this. I was sure that this particular converter was clean the first time, and it obviously wasn't. How's it done?
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#32661 - 12/09/06 04:09 PM Re: Best way to flush a converter? [Re: mark_gates]
VernMotor Offline


Registered: 11/28/03
Posts: 7190
Loc: Mt.Vernon ,Ohio
drill a 1/8 hole in the side at the seam. to drain it.all you can do with out a converter flusher. is pour fluid in it and dump it out. but you can not get it all out unless you drill the hole. weld the up when done. we are talking a very small hole and a very small amount of weld so no balance problems. I have done this many times.
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Racing is not a Hobby,But a way of Life 2000-2001 Pacemakers Major JR Dragster Champion 2005 PRO Class Champion 2006 PRO Class Champoin 2011 Mo-Power Pro champion (Jenni Vernon)

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#32662 - 12/09/06 04:14 PM Re: Best way to flush a converter? [Re: VernMotor]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
Is that fore or aft of the welded seam? You're talking on the side of the converter rather than where they sometimes have a drain plug?

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#32663 - 12/09/06 04:26 PM Re: Best way to flush a converter? [Re: mark_gates]
VernMotor Offline


Registered: 11/28/03
Posts: 7190
Loc: Mt.Vernon ,Ohio
I have not seen a drain plug in one in so long I DON'T REMEBER where they put them. you have to be real old to have seen that LOL..I drill where the two hafts over lap.beside the weld. hope you know what I mean.
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Racing is not a Hobby,But a way of Life 2000-2001 Pacemakers Major JR Dragster Champion 2005 PRO Class Champion 2006 PRO Class Champoin 2011 Mo-Power Pro champion (Jenni Vernon)

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#32664 - 12/09/06 04:32 PM Re: Best way to flush a converter? [Re: VernMotor]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
well I'm 56 vern, but I occasionally run across one-usually a stock truck converter. They put the plug on the face of the converter, usually between the balance weights and the lugs.

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#32665 - 12/09/06 04:37 PM Re: Best way to flush a converter? [Re: mark_gates]
VernMotor Offline


Registered: 11/28/03
Posts: 7190
Loc: Mt.Vernon ,Ohio
WELL I am only 49 lol and I have seen a flew of them. but no I do not drill there.
_________________________
Racing is not a Hobby,But a way of Life 2000-2001 Pacemakers Major JR Dragster Champion 2005 PRO Class Champion 2006 PRO Class Champoin 2011 Mo-Power Pro champion (Jenni Vernon)

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#32666 - 12/09/06 04:42 PM Re: Best way to flush a converter? [Re: VernMotor]
Anonymous
Unregistered


I've seen an 1/8 pipe plug in the face of the converter also. Adding one, might cause a balance problem.
If it's full of crud, I'm not sure there is any way to get it all out without splitting it.

dave (59)
florida

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#32667 - 12/09/06 04:47 PM Re: Best way to flush a converter?
VernMotor Offline


Registered: 11/28/03
Posts: 7190
Loc: Mt.Vernon ,Ohio
Well they do make a machine to flush them and that is what they do drill a 1/8 hole in them to drain them. local trans shop has one. and yes a hole for a 1/8 pipe plug is a big hole . I would not do that..
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Racing is not a Hobby,But a way of Life 2000-2001 Pacemakers Major JR Dragster Champion 2005 PRO Class Champion 2006 PRO Class Champoin 2011 Mo-Power Pro champion (Jenni Vernon)

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#32668 - 12/09/06 04:55 PM Re: Best way to flush a converter? [Re: VernMotor]
Quicktree Offline
I Win

Registered: 01/20/03
Posts: 32392
Mark the only real way to get eveything is to have it cut open.

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#32669 - 12/09/06 10:03 PM Re: Best way to flush a converter? [Re: Quicktree]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 11474
Loc: So. Burlington, Vt.
Quote:

Mark the only real way to get eveything is to have it cut open.




yup.
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#32670 - 12/10/06 12:28 AM Re: Best way to flush a converter? [Re: fast68plymouth]
1_WILD_RT Offline
Management Trainee

Registered: 01/15/04
Posts: 27347
Loc: Today? Who Knows?
Quote:

Quote:

Mark the only real way to get eveything is to have it cut open.




yup.




I'll Third That!!

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#32671 - 12/10/06 06:34 AM Re: Best way to flush a converter? [Re: 1_WILD_RT]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
That's what I figured, and neither one of these(an 84 truck converter and an old GER(that works good!) is worth doing that. Thanks.
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#32672 - 12/10/06 07:38 AM Re: Best way to flush a converter? [Re: mark_gates]
challengermike Offline
super stock

Registered: 08/16/03
Posts: 1062
Loc: Amherst,NY
Just drill a small hole and drain out the fluid.Then fill the converter up with mineral spirits and dump it again.Then weld up the hole,grind the weld down flush,then put a converter cap on the neck and a radiator hose clamp and punch a hole in it and pressureize it with a blow gun,put some atf on the weld spot and look for any bubbles coming from the weld area.This will make sure you have a good weld and it wont leak.if you see any bubbles your weld is leaking and you are going to want to grind it deeper and reweld it again.

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#32673 - 12/10/06 07:40 AM Re: Best way to flush a converter? [Re: challengermike]
Quicktree Offline
I Win

Registered: 01/20/03
Posts: 32392
Quote:

Just drill a small hole and drain out the fluid.Then fill the converter up with mineral spirits and dump it again.Then weld up the hole,grind the weld down flush,then put a converter cap on the neck and a radiator hose clamp and punch a hole in it and pressureize it with a blow gun,put some atf on the weld spot and look for any bubbles coming from the weld area.This will make sure you have a good weld and it wont leak.if you see any bubbles your weld is leaking and you are going to want to grind it deeper and reweld it again.




you still wont get all the metal out. you got to ask your self is it cheaper to make sure the converter is clean or rebuild the tranny again?

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#32674 - 12/10/06 12:48 PM Re: Best way to flush a converter? [Re: VernMotor]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19817
Loc: Rio Linda, CA
If you're going to drill a drain hole you might as well take the extra time and tap it for a drain plug. Grease the drill and tap to help prevent shavings from entering. The early converters were tapped 1/8" NPT but they changed to 1/16" NPT in the mid seventies.

I've seen converters cut open after flushing with commercial flushing machines with the air blast feature and you'd be amazed at how much gunk is left (some of it loose).

The only to get it really clean is to cut it open.
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#32675 - 12/10/06 01:17 PM Re: Best way to flush a converter? [Re: John_Kunkel]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
Just a thought-how much pressure in the line out to the cooler and back? Might be a good place for a temporary filter?

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#32676 - 12/10/06 04:15 PM Re: Best way to flush a converter? UPDATE [Re: mark_gates]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
Well, as it turned out they both had drain plugs on the face of them, so I drained them. GER looked quite clean, the truck conv somewhat brown. I replaced the plugs and filled with kerosene. With them laying face down I then used a spare front pump assembly(unrebuilt) and installed it to hold the sprag and spun it back and forth vigorusly. Then I installed a spare input shaft and spun that as well. With the face down over a bucket, I quickly removed the drain plug and applied compressed air, boiling the kerosene inside. This creates a vapor, so be careful. I then drained them. Both of these trans will be run in on an engine stand; usually I simply run a line from the out to cooler line right back into the return port, as there's no real load on the tranny. I think I will install a clear plastic fuel type filter in that line to see what I catch. The rear drum and support was lost on the stand the very same way, but I'm thinking either the damage was already there and I didn't catch it, or there may have been a mess of crap in the line that I used, as the converter came out real clean. Odd thing was, most of the damage was to the drum bearing surface, not the support itself.


Edited by mark_gates (12/10/06 04:18 PM)

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#32677 - 12/10/06 04:28 PM Re: Best way to flush a converter? UPDATE [Re: mark_gates]
Sport440 Offline
master

Registered: 01/20/03
Posts: 6590
Loc: Canton, Ohio
I agree the only way to make sure you get all the junk out is to cut it open. But with what you have going on I think you will be okay with what your doing. Well except for that Filter part.

Thats a good idea but what do you have planned for a Filter. There is a good amount of flow going through those lines with alot of pressure. When you say one of those clear filter types I picture one of those cheap gas inline filters. I hope thats not the case .mike

Edit I Reread and see you stated the fuel type clear filters. No , Im positive that wont work. I like your idea though. The oil is much to thick and the pressure will be to high IMO. You will POP those filters like a balloon IMO. mike


Edited by Sport440 (12/10/06 04:33 PM)

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#32678 - 12/11/06 07:04 AM Re: Best way to flush a converter? UPDATE [Re: Sport440]
mark_gates Offline
Fish Bowl Racer

Registered: 01/19/03
Posts: 6354
Loc: Cambridge Vt.
That what I figured; I'll figger something out, Lol!

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#32679 - 12/11/06 12:54 PM Re: Best way to flush a converter? UPDATE [Re: mark_gates]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19817
Loc: Rio Linda, CA

Here's an inexpensive filter designed for the job:

http://www.bulkpart.com/Merchant2/mercha...e=inline-filter
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