Oil pump Dowel pin too tight - Chevelle Tech
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  • 1 Post By Tom Mobley
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post #1 of 15 (permalink) Old Nov 15th, 19, 9:50 PM Thread Starter
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rick
 
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Oil pump Dowel pin too tight

I'm putting a melling HV pump in a BB and the pin closest to the shaft is too tight, pump to cap is over an 1/8th to 3/16ths inch do I drill the hole a little larger? I'm worried if I just tighten it down it'll crack the pump, I did a search and didn't find anything on this problem I cant be the first with this problem?
Oh and any reason not to use locktite on the stud & nut?


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Last edited by shovelrick; Nov 15th, 19 at 9:59 PM. Reason: more text
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post #2 of 15 (permalink) Old Nov 16th, 19, 8:03 PM
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Re: Oil pump Dowel pin too tight

just torque the nut to 60 or so, no loctite needed or wanted.

Why the HV puimp? stuck in the 80s?

yes, just use the next size bit larger than the pin. that would be in 64ths.
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post #3 of 15 (permalink) Old Nov 16th, 19, 9:03 PM
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Re: Oil pump Dowel pin too tight

You might try running a file around the pin first.

And as Tom hinted, the "hot setup" is the standard pump with the blue high-pressure spring.
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post #4 of 15 (permalink) Old Nov 16th, 19, 9:52 PM
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Re: Oil pump Dowel pin too tight

It sounds like the pins are spaced correctly, from what you indicate, but, one of the pins, or both have drilled locating pin holes too small in diameter to fit the dowel pins.

I would think the pump didn't get drilled correctly. If it were my pump, and that were the case, it wouldn't get anything but taken back to the vendor, and a pump with no defects obtained.

Just my opinion.
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post #5 of 15 (permalink) Old Nov 17th, 19, 1:11 PM Thread Starter
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rick
 
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Re: Oil pump Dowel pin too tight

It's the same model pump I installed in my 454 with 22,400 miles on it 7 yrs. ago and it seems to work really good, I've already pressed the new pick up in and bolted the bracket to it (haven't decided on welding it) prob drill the hole


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post #6 of 15 (permalink) Old Nov 17th, 19, 6:46 PM
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Re: Oil pump Dowel pin too tight

Might align the pump on the drill press to drill the hole out straight. really easy to mis-align the hole, putting side load on the dowel hole, which might cause pump nousing failure later on.

As far as the pickup, I stopped welding/brazing pickups to them decades ago. I use the bracket to hold the pickup in place, and if you make your own brackets, it is easy to build one that will not allow the pickup to fall out, nor move. Just be creative.

I have also seen pickups that were welded all the way around their tubes at the pump, literally fall apart at the weld, pressed in end still in the pump, tube metallurgy altered to the point it was weakened by/at the weld.
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post #7 of 15 (permalink) Old Nov 17th, 19, 7:43 PM
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Re: Oil pump Dowel pin too tight

If the old pump fits and the new one doesn't then there is a problem with the new pump and should be taken back to the shop and swapped for another.
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post #8 of 15 (permalink) Old Nov 17th, 19, 7:50 PM Thread Starter
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Re: Oil pump Dowel pin too tight

This was a bare 4 bolt main studded/head studs block I got with nothing else, going to try a small rat tail file on the hole
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post #9 of 15 (permalink) Old Nov 17th, 19, 9:46 PM
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Re: Oil pump Dowel pin too tight

Quote:
Originally Posted by Dave Ray View Post
Might align the pump on the drill press to drill the hole out straight. really easy to mis-align the hole, putting side load on the dowel hole, which might cause pump nousing failure later on.

As far as the pickup, I stopped welding/brazing pickups to them decades ago. I use the bracket to hold the pickup in place, and if you make your own brackets, it is easy to build one that will not allow the pickup to fall out, nor move. Just be creative.

I have also seen pickups that were welded all the way around their tubes at the pump, literally fall apart at the weld, pressed in end still in the pump, tube metallurgy altered to the point it was weakened by/at the weld.
That's a classic case of overkill. I weld mine on, but just one small tack with the MIG is all that's needed.

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post #10 of 15 (permalink) Old Nov 18th, 19, 7:31 PM
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Re: Oil pump Dowel pin too tight

Try this before you take a file to the rear main cap:

1. If you have another pump - new or old - see if that one fits.
2. If you have another block - or at least another rear main cap - see if the pump fits that.
3. If you have neither - take your pump and rear cap to your friendly engine shop and see if they can try the pump on one of their blocks / caps. See if an old pump fits on your cap.

That way you will find out which is the culprit.
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post #11 of 15 (permalink) Old Nov 18th, 19, 8:23 PM
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Re: Oil pump Dowel pin too tight

OK, just what can be safely welded, or brazed to CAST IRON?

Well, only one thing, CAST IRON, when the parts are welded at a high temperature, which would cause heat distortion of the CAST IRON parts.

Over kill, "I don't think so, Tim" (Randy).

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post #12 of 15 (permalink) Old Nov 18th, 19, 9:45 PM Thread Starter
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Re: Oil pump Dowel pin too tight

The stroker assembly I got from Mike Lewis has already been assembled in the short block so I really don't want or can't remove to cap to file it, I'm going to open up the 1 pin hole that's tight and I'm thinking it should be fine, hoping my 2.5 yr old HP 17" laptop will get back to letting me post pics when I want, been reading a lot about rocker arm geometry since that's coming up soon on this engine, uhg


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post #13 of 15 (permalink) Old Nov 19th, 19, 1:15 AM
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Re: Oil pump Dowel pin too tight

Quote:
Originally Posted by shovelrick View Post
The stroker assembly I got from Mike Lewis has already been assembled in the short block so I really don't want or can't remove to cap to file it, I'm going to open up the 1 pin hole that's tight and I'm thinking it should be fine, hoping my 2.5 yr old HP 17" laptop will get back to letting me post pics when I want, been reading a lot about rocker arm geometry since that's coming up soon on this engine, uhg
Rick
Not a big deal just open the damn hole like you mentioned in your first post,,,,,,,,,

As a matter of info there are some aftermarket blocks that are drilled so you have to use a .250 pin so you have to open the pump to make it fit
The standard pin is .247
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post #14 of 15 (permalink) Old Nov 20th, 19, 1:19 PM Thread Starter
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1/4" bit fit through with my fingers so I used a cordless drill cleaned the hole and WaLa
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post #15 of 15 (permalink) Old Nov 20th, 19, 4:08 PM
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Re: Oil pump Dowel pin too tight

Good deal, sir.
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