hi

i received my M-10552 pump today, and it have the pink high pressure spring installed...

currently i run a SV/SP "non-performance"pump.., its a Sealed Power (that is made by Melling)

can i just swap the springs? are they equal length?

thank you

 

My vote is that the spring from the Sealed Power 224-4146
(5/8" press-in inlet) is not a direct replacement for the
pink spring supplied with the Melling 10552 pump.

My reasoning is that the Sealed Power pump is likely to use
a roll pin retainer for the by-pass spring, instead of a
screw-in plug like the M-10552.

The pink spring in an M-10552C has the following dimensions
For comparison, the M-10553 uses an OEM-like roll pin retainer.
While it also ships with a pink spring, the spring is larger in
diameter, nearly the size of the bore of the by-pass - 0.442".
Moreover, the outer end of the spring coils into the centerline
of the spring, probably to ensure that it can not 'unthread'
itself over the retaining pin.

Although the screw-in plug of the M-10552C extends into the
bore roughly the same distance and the location of the roll pin,
the inner side of the screw-in plug has a cavity/counter-bore
that the smaller dia spring seats into.

I have a spare yellow std pressure spring for an M-10552C but
it is in deep storage. When I am able to get to it, I will post
dimensions.

In a worst case scenario, someone could research round wire
die-fixture springs and attempt to come up with the best candidate.
Contacting Melling Tech Support would probably
be simpler.

.

 

Does any one have a Sealed Power or OEM pump on the shelf.

How large is the outside diameter of the by-pass spring? There is no
need to remove the spring, a visual will do. Does it essentially fill the
by-pass bore?

.

 

Actually, the standard pressure spring I have is bare steel.

This unpainted standard pressure spring for an M-10552C has the
following dimensions:
Note that this spring probably is not suitable for the 10553 pump.

.

 

I dont know if this helps,

but I have a #26 SBC High Pressure Oil Pump Spring made by Mr. Gasket that measures .300" OD by 2.220" long

Never used still in the package on my desk so it has not been collapsed, no paint color, just steel.

 

Don't know about the spring.I run a 'white' firebird spring which gives me about 75psi cold.Just chipped in to remind you to weld the pick up if you haven't already done so.

 

At first, the available dimensions suggested your Mr G spring is similar
to the spring I have.

However, a check of the catalog (p54) indicates that the company markets
the spring as a 'High-Pressure Oil Pump Spring'. Mind you, 'Hot 45-50 lbs'
is not all that high.



LD85, if you have calipers and some time it would be interesting to see
the rest of this spring's physical measurements for a more complete
comparison. (I measured coils-per-inch inward from the ends to get
away from the squared/ground portions.)

At the risk of redundancy, this spring and my springs are 0.300-0.320"
in outside dia. They fit into the recess of the screw-in plug retainer.
Springs in the pumps that use a roll (taper) pin for retention are larger
in outside diameter, nearly the size of the bore of the by-pass - 0.442".

.

 

10 coils per inch
.300" OD
2.220-2.230" OAL

 

10 coils per inch
.300" OD
2.220-2.230" OAL

 

Diameter of the wire itself?

.

 

Sorry,,, .040" wire diameter

 

Thanks

The pink spring in an M-10552C has the following dimensions
The unpainted standard pressure spring for an M-10552C has the
following dimensions:
Restating the dimensions of LD85's Mr Gasket 'High-Pressure Oil
Pump Spring' (P/N #26) gives us the following
With just the info above, it will take someone with more knowledge
& experience than I have to come up with firm conclusions about what
differences in oil pressure would be observed in a back-to-back test of
these three springs in any given engine. It isn't that I do not have an
opinion, just that it would be no surprise if my guess turned out wrong.

In a previous life, I made a BBC pump pressure tester 'fixture' out of a
scrap rear main cap. That approach is still valid, but if there is a
chance you'd be testing more than GM pumps you would be money
ahead to buy Percy's Oil Pump Dyno #01002.



Proper use of some kind of bench test fixture would give you the
opportunity to narrow down the pressure map that would occur and
make adjustments prior to assembly/installation.

.

 

Some information about the OEM GM White spring. I believe this is
the one with the large outside diameter for pumps with the roll/taper
pin spring retainer.

Gilbert
GM Parts Direct

 

[QUOTE=Slalom4me;1563764018]Some information about the OEM GM White spring. I believe this is
the one with the large outside diameter for pumps with the roll/taper
pin spring retainer.

Gilbert
That's the one and it was fitted by Lingenfelter in my engine.Another Lingenfelter trick is to Tap and plug the high pressure bypass hole.It's only there for people who never change filters and if you have a blocked filter it allows oil circulation.Of course when you have people like us that are religious about oil and filter changes that doesn't apply and it makes sure that all the circulating oil passes through the filter.Those pressures are a little low.Mine hits 80 on a cold start if I rev it a little(which I don't) and usually hangs around 65/70 normal driving and drops to 45 on a hot idle.
AND I REPEAT,WELD ON THAT PICKUP.

 

thats exactly what i received from Melling today...

 

Hi

installed the 10552 pump today, with the stock
pressure spring, i´m getting 55-60lbs, hot or cold...

 

My mellings M55 is 80 psi cold and 40-45 psi when warm, around 180 degrees. So, I must have the higher pressure spring.
Mine has a roll pin and a orange colored spring. It was installed in engine 2001.
This is in my 96 LT1 396 in my 93 Vette

Mine may be a Canton Racing spring
http://www.cantonracingproducts.com/oil_pumps/acc.html

 

[QUOTE=staugur;1563764749]Is this plug what LPE does to bypass?

 

I just recieved two springs from Mellings.
Heres their quote. I run the M55 pump.
I want the lower pressure, what spring would you run.
"The M-55 uses the yellow spring & is standard volume, standard pressure pump. The M-55A uses the green spring & is a standard volume , high pressure pump."
My spring that was in it was a Canton Orange spring. The green spring Mellings sent is longer than both the Orange and Yellow. Tuesday I will get exact dimensions.