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A-990 aluminum pumps have a steel sleeve for rotor? #2527891
07/27/18 02:48 PM
07/27/18 02:48 PM
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fullmetaljacket Offline OP
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Hey A-990 gurus.
Does anyone know if the original A-990 aluminum body oil pumps have a steel sleeve in them to prevent the inner rotor and shaft from prematurely eating away at the aluminum in a street duty application?
Just curious..HHHmmmmmmmmmm.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2527899
07/27/18 03:07 PM
07/27/18 03:07 PM
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Stuttgart, Arkansas
rickseeman Offline
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no


2011 Drag Pak Challenger
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: rickseeman] #2527911
07/27/18 03:35 PM
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fullmetaljacket Offline OP
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AHHHH, so I guess those pumps were constantly being serviced or replaced by the racers of the day just to keep 'em running clean.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2527917
07/27/18 03:40 PM
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dogdays Offline
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Why do you make that assumption?

An oil pump shaft has a constant supply of oil, plus steel on aluminum is what most engines run for main and rod bearings.

R.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: dogdays] #2527920
07/27/18 03:44 PM
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fullmetaljacket Offline OP
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I'm just thinking that the steel shaft along with the constant spinning, pulling and or side forces from pumping under pressure would wear and tear against the aluminum. I mean, thats' why aluminum blocks have steel sleeves right?
I'm just curious if those pumps led to premature disturbances in the Hemi's of the day being that they had a whole set of issues.
PLUS, I wouldn't mind running one in my street/strip blazer if it were proper.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2527925
07/27/18 04:01 PM
07/27/18 04:01 PM
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rickseeman Offline
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I think what hurt them most was blow ups getting metal pieces in them. The aluminum can't take much metal without scoring it.


2011 Drag Pak Challenger
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: rickseeman] #2527939
07/27/18 04:20 PM
07/27/18 04:20 PM
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fullmetaljacket Offline OP
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Yeah, but wouldn't you say that even a fairly healthy motor still creates an minute amount of residue/waste shavings that can eat away at the pumps. I mean, if a motor went south on me, I'd change the whole pump assembly even if it were steel.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2527971
07/27/18 05:07 PM
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rickseeman Offline
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We would like to change the pump but nowadays there's no A-990 pumps on the shelf. Years ago NHOA found a NOS stash of them and had them in the newsletter for sale for $19.95 each. But those days are gone.

Last edited by rickseeman; 07/27/18 05:07 PM.

2011 Drag Pak Challenger
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2527980
07/27/18 05:34 PM
07/27/18 05:34 PM
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What’s a NOS pump worth these days?

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528020
07/27/18 06:40 PM
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rickseeman Offline
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I don't know but I would like to have one.


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Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528070
07/27/18 09:06 PM
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There is always the Milodon billet oil pump and cover


07 Porsche C2 997.1 6spd DD and SCCA Solo II SS
68 Plymouth GTX Convert. 493cu Hotkiss Wilwood Classic air, Building for Solo II Cam
65 Chrysler 300 Convert. project
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Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528108
07/27/18 11:15 PM
07/27/18 11:15 PM
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Stanton Offline
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The surface area in the pumps is large enough to prevent wear. If the pumps were regularly swapped out as you say it was probably because some other debris got into the pump and screwed it. Also, covers, rotors and stators are the most prone to wear, not the pump body.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: Stanton] #2528112
07/27/18 11:24 PM
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fullmetaljacket Offline OP
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I would argue as well "not the pump body" but in this case aluminum pump body? Softer material casted in the early 60's.
Especially aluminum casted in those early days compared to billet tempered alloys such as the case today.

Last edited by fullmetaljacket; 07/27/18 11:25 PM.
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528144
07/28/18 12:27 AM
07/28/18 12:27 AM
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Buicks had the oil pump in the alum front cover and they have a terrible reputation for wearing out prematurely.


Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528158
07/28/18 01:03 AM
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Why not use the Milodon billet pump? You're mostly after the weight savings correct?

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: AndyF] #2528170
07/28/18 01:56 AM
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fullmetaljacket Offline OP
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Yeah, aside from the curiosity of reliability, I did take a good look at a real A-990 unit recently and it almost bit me again with the STOCK look.
Yes, I've thought of the Milodon unit as well, but the A-990 looks the part without the assurance. That being said, I would not chance my motor on some unit that has the look but can cook my motor.

Last edited by fullmetaljacket; 07/28/18 01:57 AM.
Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528176
07/28/18 02:43 AM
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AndyF Offline
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Not a super difficult part to make so you could have a shop build you some billet pump housings that look stock on the outside. Have them hard anodized for wear. Paint the outside with some cast iron looking paint and you're there. Lots of work for 3 lbs.........

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: AndyF] #2528283
07/28/18 02:09 PM
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Originally Posted By AndyF
Not a super difficult part to make so you could have a shop build you some billet pump housings that look stock on the outside. Have them hard anodized for wear. Paint the outside with some cast iron looking paint and you're there. Lots of work for 3 lbs.........


why not just hard anodize a good, stock, pump [if you can find one] ? that would spare the time and expense of machining one, unless you are after one of today's better alloys instead of yesterday's castings.
beer

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528320
07/28/18 04:03 PM
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AndyF Offline
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I don't think you would want to anodize a 50 year old, used, cast aluminum oil pump. I think the odds are very high that you would end up with a mess if you tried it.

Re: A-990 aluminum pumps have a steel sleeve for rotor? [Re: fullmetaljacket] #2528927
07/30/18 09:58 AM
07/30/18 09:58 AM
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Anodizing old parts is not complicated or risky when properly done.
We regularly anodize trans parts in Reman at Chrysler with no issues.

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