Pump to scored up to use?

[Warrant]

Whats a good way to go about determining if its wrecked?

If I run my finger nail across it, it'll make a "buzzing/zipper" sound. And if I push real hard with my finger nail it wont really get caught up to much, it will hang up for a sec but keep moving along.

I used 400 grit with oil and sand it in round circle on one side for about 1 minute. It got rid of all the fine scratches and made it alot smoother, however you can still feel very slight "bumps"

Here some pics if you can tell anything from them.

 

[Warrant]

Well I got some opinions from local people. Not going to risk it, Ill just get a better one.

Does anyone know or can help find the late model pump halves? 690 an 088?

Thanks

 

[bison]

Its hard to tell the severity of the grooves. Usually the flat half is worse and can be sanded if you have a granite slab. It takes a little effort but it will smooth out. The pocket depth can not be altered. If it is then the pump clearance has to be reset. There is no room for error there. .0007-.0015 assembled. Do not switch out pumps either unless they are the same exact measurement. Tenths count here. By a complete assembly from one of the vendors on here unless you have the ability to clearance one properly.

 

[Warrant]

In my case, the flat half (stator) is in better shape.

So I can make the flat half flat again without worrying about it changing clearance? Its ok to take off a couple thousands? clearance is deteremined by the bushing half?

I really cant afford a performance spec'd pump from someone. I already have all the HP valve and all new pump parts.


What do you mean by "you cannot switch out pumps either" ? You cant swap the halves? or you cant put in new rotor/vanes/slide etc.?

In a nutshell, what is involved to clearance the pump?

Thank you for your help.

 

[bison]

You cant switch pumps or halves unless its the flat half and the same casting. You cant swap out rotors/slides without verifying clearances. They are selective by tenths of thousandths. You need a means to get flat surfaces and a means to machine and measure the rotor/slide/housing to achieve proper depth and the tools to measure the parts. Plastigage can be used to check the assembled clearance. A machinist would have tools to measure depths and thickness of parts at their disposal.