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Best way to flush a converter? #32660
12/09/06 06:09 PM
12/09/06 06:09 PM
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Cambridge Vt.
mark_gates Offline OP
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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?

Re: Best way to flush a converter? [Re: mark_gates] #32661
12/09/06 07:09 PM
12/09/06 07:09 PM
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Mt.Vernon ,Ohio
VernMotor Offline
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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.

Re: Best way to flush a converter? [Re: VernMotor] #32662
12/09/06 07:14 PM
12/09/06 07:14 PM
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Cambridge Vt.
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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?

Re: Best way to flush a converter? [Re: mark_gates] #32663
12/09/06 07:26 PM
12/09/06 07:26 PM
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Mt.Vernon ,Ohio
VernMotor Offline
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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.

Re: Best way to flush a converter? [Re: VernMotor] #32664
12/09/06 07:32 PM
12/09/06 07:32 PM
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Cambridge Vt.
mark_gates Offline OP
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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.

Re: Best way to flush a converter? [Re: mark_gates] #32665
12/09/06 07:37 PM
12/09/06 07:37 PM
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Mt.Vernon ,Ohio
VernMotor Offline
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WELL I am only 49 lol and I have seen a flew of them. but no I do not drill there.

Re: Best way to flush a converter? [Re: VernMotor] #32666
12/09/06 07:42 PM
12/09/06 07:42 PM

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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

Re: Best way to flush a converter? #32667
12/09/06 07:47 PM
12/09/06 07:47 PM
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Mt.Vernon ,Ohio
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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..

Re: Best way to flush a converter? [Re: VernMotor] #32668
12/09/06 07:55 PM
12/09/06 07:55 PM
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Mark the only real way to get eveything is to have it cut open.

Re: Best way to flush a converter? [Re: Quicktree] #32669
12/10/06 01:03 AM
12/10/06 01:03 AM
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So. Burlington, Vt.
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Quote:

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




yup.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Best way to flush a converter? [Re: fast68plymouth] #32670
12/10/06 03:28 AM
12/10/06 03:28 AM
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Quote:

Quote:

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




yup.




I'll Third That!!

Re: Best way to flush a converter? [Re: 1_WILD_RT] #32671
12/10/06 09:34 AM
12/10/06 09:34 AM
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Cambridge Vt.
mark_gates Offline OP
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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.

Re: Best way to flush a converter? [Re: mark_gates] #32672
12/10/06 10:38 AM
12/10/06 10:38 AM
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Amherst,NY
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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.

Re: Best way to flush a converter? [Re: challengermike] #32673
12/10/06 10:40 AM
12/10/06 10:40 AM
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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?

Re: Best way to flush a converter? [Re: VernMotor] #32674
12/10/06 03:48 PM
12/10/06 03:48 PM
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Rio Linda, CA
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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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Re: Best way to flush a converter? [Re: John_Kunkel] #32675
12/10/06 04:17 PM
12/10/06 04:17 PM
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Cambridge Vt.
mark_gates Offline OP
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Just a thought-how much pressure in the line out to the cooler and back? Might be a good place for a temporary filter?

Re: Best way to flush a converter? UPDATE [Re: mark_gates] #32676
12/10/06 07:15 PM
12/10/06 07:15 PM
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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.

Last edited by mark_gates; 12/10/06 07:18 PM.
Re: Best way to flush a converter? UPDATE [Re: mark_gates] #32677
12/10/06 07:28 PM
12/10/06 07:28 PM
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Canton, Ohio
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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

Last edited by Sport440; 12/10/06 07:33 PM.
Re: Best way to flush a converter? UPDATE [Re: Sport440] #32678
12/11/06 10:04 AM
12/11/06 10:04 AM
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Cambridge Vt.
mark_gates Offline OP
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That what I figured; I'll figger something out, Lol!

Re: Best way to flush a converter? UPDATE [Re: mark_gates] #32679
12/11/06 03:54 PM
12/11/06 03:54 PM
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Rio Linda, CA
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Here's an inexpensive filter designed for the job:

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


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Re: Best way to flush a converter? UPDATE [Re: John_Kunkel] #32680
12/11/06 08:41 PM
12/11/06 08:41 PM
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Cambridge Vt.
mark_gates Offline OP
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Thanks, John.!

Re: Best way to flush a converter? UPDATE [Re: mark_gates] #32681
12/11/06 09:09 PM
12/11/06 09:09 PM
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Northeast, Alpine, NY
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9 Sec Phill Offline
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You can try some stuff called fleet, worked for me for my colonoscopy, flushed me out but good .....JK...Phill

Re: Best way to flush a converter? UPDATE [Re: mark_gates] #32682
12/11/06 09:32 PM
12/11/06 09:32 PM

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Anything that will come out of a hole drilled in the side of a converter will also come out the hub. Mark, I trashed a few 904`s and replaced them at the track. Just sparyed brake clean in the converter shook it and turned it over.Never had a converter get hurt breaking a sprag in the trans.

Re: Best way to flush a converter? UPDATE [Re: 9 Sec Phill] #32683
12/11/06 09:34 PM
12/11/06 09:34 PM
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Illinois
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That bulkpart link has reasonable prices on kits too but last time I got an order it was drop shipped from another supplier and they goofed and left the invoice showing what bulkpart(Makco Distributing) paid. I dont have the link here at home,its at work if intrested.

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