Vacuum pump swap problems - HELP!

[fields_mj]

Okay, so I ordered a rebuilt Vacuum pump from Rock Auto and it came in today. While I was at lunch, I bought the puller kit from Car Quest. I got home this evening, and got the old pump off no problems. Pulled the pulley off, no problems. Hooked up the vacuum line, bolted the new pump on, no problems. Went to install the pulley, MAJOR PROBLEMS. The pulley will fall off! I grabbed my calipers and measured the pump shafts. The old shaft measures 0.669" and the new one measures 0.650"!!! ***!!! I'm going to put the old pump back on so that I can get too and from work tomorrow, but I need to know what my options are. I've spoken to Rock Auto and of course all the manufacturers are closed by now. I'm going to call back in the morning and see what they can do, but I'm not holding my breath at this point. I need this fixed by tomorrow evening at all costs. I can not get the pump locally. I can get one ordered, but the only thing I can order is a reman Cardone, which is what I bought from Rock Auto.

What are my options?

 

[sassyrel]

hmmmm,,first ive ever heard of that..wonder if someone put the wrong shaft in it????

 

[GenLightening]

There was a good pump on a 94 the last time I hit the wreckers here. An option for you.

 

[icanfixall]

Russ (typ4) posted about this differant shaft size once before... As I recall he posted the smalle rsize fits the chevy trucks but its been a few years ago since this was posted. Sorry for your issues but it will come around next time... Just heng in there. I know if you ordered from ford or international the correct part would be in your hands but at what outlandish cost... That id the problem dealing with the factory sometimes... You gotta pay big to them... That shouldn't be... The factory should be at least 15% lower than any rebuilder on the outside....

 

[itsacrazyasian]

We have a saying at our shop

a1cardone = hey juan do it again. (juan being their rebuilder goon)

It is.

The Suburban vacuum pump has a smaller shaft than my Ford. The Burb has a smooth pulley from a Ford on it now, that is till i eliminate the vacuum pump (which is there just for boost control) because the cardone pump i got from advance didnt fit my gm pump pulley.

 

[fields_mj]

Well, I think I figured it out. The original pump has the same shaft diameter all the way out. The cardone has the shaft reduced down until you get the pulley up to about the last 1/8", then it steps out to the correct diameter. What a piece of junk! Why would they go through the effort of grinding away extra material in order to make a sub par product? It's working now, and my breaks are back to normal. I put 100 miles on it this evening, so it should be okay. I'm going to talk to Rock Auto about this and let them research it. Maybe they will stop carrying cardone Doubt it, but what the heck, I'll try. I will also get another (good) pump too keep with me in the truck. Since I own the puller now, and I keep a set of metric and standard wrenches in the truck, and a spare belt, I should be able to change it on the side of the road pretty easy.

Thanks for the feedback!!!
Mark

 

[Exekiel69]

Thats no problem, the pump should be attached to the shaft part with 4 10mm bolts. You remove this bolts and the ones on the used one and just swap the diaphragm then re install. You keep Your shaft and pulley on the same unit. The V belts use a different shaft and that is what You got.

 

[fields_mj]

Thats no problem, the pump should be attached to the shaft part with 4 10mm bolts. You remove this bolts and the ones on the used one and just swap the diaphragm then re install. You keep Your shaft and pulley on the same unit. The V belts use a different shaft and that is what You got.

If that's the case, then I'm just going to make them send me the correct part. It's not like I specified the wrong truck or something when I bought it. Although I got what I believe is a good price on the pump, they still owe me the correct part.

 

[icanfixall]

Yes... You are owed the correct part. Having a spare behind the seat is good practice too. I would get a new pulley from ford to go along with the new spare pump too. They are very cheap and thats kinda funny from ford... Ford no longer sells the belt guide but does have the three bolts in a bag for sale...

 

[MIDNIGHT RIDER]

You can do as EXEKIEL says; or, in the case of the bearings being shot, you can swap the shafts into the new bearings.

The internals of these pumps are ridiculously simple; the shaft rides in two bearings, with a cam-lobe/eccentric between; an operating rod rides on the cam and works the diaphragm.

 

[snicklas]

Also, Just curious. I mentioned this in the other thread also,

Did the new pump have oil in it. I remember reading not long ago that someone replaced their vacuum pump and the new one did not have oil in it. Might want to double check it. I know that Midnight had talked about the oil and changing it. Maybe he will chime in again on this here. I just do not want to see you have to repeat this work in a few days because you ran the new pump dry......

 

[icanfixall]

If both bearings are sealed then you wont have oil in the case but... Its going to be really difficult seeing into the case at the inside bearing shield... These bearings can be bought with a shield on one or both sides. If the bearing has a shiled on both sides you don't need to oil them... On one side you need oil...

 

[MIDNIGHT RIDER]

If both bearings are sealed then you wont have oil in the case but... Its going to be really difficult seeing into the case at the inside bearing shield... These bearings can be bought with a shield on one or both sides. If the bearing has a shiled on both sides you don't need to oil them... On one side you need oil...

What he said be true; except, the operating-rod would be riding the eccentric dry.


I would fill it up with oil regardless.