Oil Pump Torque Values & Other Q's

[Indycars]

I've tried to find the torque values for the 4 bolts that attach the pump cover, even going to Mellings
website. All I've found is someone posted 80 inch/lbs. I've sent an email to Melling, but don't
have much hope for a response. The pump is a Melling 10552.

Even if the pickup is bolted like in the pic, does everyone still weld the pickup to the cover ???

What's the purpose of the threaded hole into the pump inlet passage ???

 

[grumpyvette]

Ive always just tightened those oil pump cover bolts, snug, by feel with high temp loc-tite on the threads or used safety wired bolts, but about 9-10 ft lbs seems close.

http://www.google.com/products/catalog? ... CD4Q8wIwAw
Ive never had a problem in 40 plus years, and yes I generally do silver solder or braze the pick-up even if its bolted on, but obviously thats rather redundant ,and probably not required

viewtopic.php?f=50&t=4306&p=11353&hilit=safety+wire#p11353

while helical cut gears will run smoother ,
( ESPECIALLY WITH THE STOCK 7 tooth SBC oil pump)
as you potentially have 2 or three gear teeth in various stages of gear tooth contact
(depends on the angle of tooth engagement)
and yes the design will reduce a tendency to produce a pressure pulse, I have not seen this as a major issue.
simply swapping to the standard volume and pressure BIG BLOCK 12 tooth oil pump in a SBC engine all but eliminates the pulse and pressure and volume issues a sbc oil pump has.

adding "ST" to the end of the existing melling SBC OIL PUMP part number denotes the helical gear set option

if your serious about having a bolt holding something like an accessory, STARTER, Alternator, or bracket or u-joint strap etc. remain securely fastened , theres two steps you can take to assure it won,t come loose unless you want it too
step one
use a clean, and well degreased bolt and threads, and apply a decent thread locker to the threads, then torque them to the intended torque

step two
USE DRILLED SAFETY WIRE LOCKS
viewtopic.php?f=50&t=4306&p=26502&hilit=safety+wire#p26502

if you use BOTH youll find bolts stay exactly where you left them
RELATED INFO

http://www.youtube.com/watch?v=tOiHdIXV ... dded#at=34

http://www.summitracing.com/parts/MEL-10778/?rtype=4

http://www.youtube.com/watch?v=KOIhaI3e ... r_embedded

http://www.summitracing.com/parts/MEL-1 ... m=4&page=1

viewtopic.php?f=54&t=3536

viewtopic.php?f=54&t=1800

as to the threaded port in the pump, Ive never seen that before and when I called their tech dept, ,(1-517-787-8172) to ask the tech guys at MELLING the office answering services says the office is closed at this time

 

[Indycars]

Big thanks for trying to find out thru Melling !!!

Is there some reason you are using the Loctite 620 instead of the Loctite 262 ???
Twenty years ago I bought he 262 in a 1.69 FL. OZ. size, hope it doesn't have a shelf life.
This is what I'm planning on using since I already have plenty.

Loctite 620
Loctite® Bearing Mount 620 is a high temperature (450°F), high viscosity liquid retaining compound. Provides a shear
strength of over 3,800 psi on steel. Locks and secures metal cylindrical assemblies up to 0.015" diameter clearance.
Prevents metal fretting and corrosion.

Loctite 262
Loctite® 262 High Strength Red Threadlocker is a permanent threadlocker for fasteners up to 3/4" (20 mm) in diameter.
Excellent for preventing rust and corrosion in extreme chemical / environmental conditions. Mil Spec: Mil-S-46163A Type II
Grade 0. ASTM-D5363: Group 3 Class 3 Grade 1.
On my container it also says "Parts can be heated to 450 F to be disassembled".

 

[grumpyvette]

"Is there some reason you are using the Loctite 620 instead of the Loctite 262 ???"


Twenty years ago I bought he 262 in a 1.69 FL. OZ. size, hope it doesn't have a shelf life.
This is what I'm planning on using since I already have plenty."

well, I bought it just for that application (Loctite 620) and , since I have it, I use it, but Ive also used the more common (BLUE) and( RED) loctite in the past and never had any issues using those either, so the main thing is just use a thread locker, I doubt it makes any difference, one of my friends has always used the bolt threads dipped in

and thats worked well also, in most cases the sealant just adds enough extra friction to the bolt threads, to prevent vibration from loosening the bolts
(its a bit of extra insurance like safety wire)

 

[grumpyvette]

well I called MELLING BACK and the threaded plug hole , is there to allow access when they machine the by pass valve passages and should be plugged with a shallow threaded allen key plug that should have come with the pump, (PUT LOCTITE ON THE THREADS) it serves no purpose but to allow access to the area during the manufacture process

 

[Indycars]

So they do have real people at these places of manufacture. I've sent emails on several occasions and never gotten a response. The latest was asking for torque values (4 bolts) for the pump cover.

I can't believe you went to all that trouble to find out, I really appreciate that. BTW, there was a threaded plug supplied with the pump.

 

[Indycars]

I called Melling today since I never received a response to my email for torque values for the 4 bolts holding the pump cover. I was surprised, some answered promptly and was very friendly. The torque values are 80-106 in lbs, without lubrication.

 

[grumpyvette]

I wonder how many guys even own an inch lb torque wrench or have ever bothered to even try to look that up on those bolts?
I sure own a inch lb torque wrench , but I don,t think Ive ever done an oil pump except by tightening those cover bolts by feel, usually using an alllen wrench and socket head cap screws on those bolts

 

[Indycars]

I have an 1/4" torque wrench that goes to 50 in lbs and then it jumps to a 3/8" that goes to from 10-100 ft lbs. So it looks like I have a problem unless I can borrow one. Wish 50 in lbs was enough with Locite on the threads, then I would have it made.

My biggest motivation for finding out the torque specs is money.....I can' afford NORTH of $6,000 to go up in smoke !!!Us old guys know that fear is there for a reason, unlike teenagers who are indestructible.

 

[grumpyvette]

http://www.sears.com/shc/s/p_10153_1260 ... 1809972071 good (heres what Ive used for years with no problems)

http://www.harborfreight.com/1-4-quarte ... -2696.html functions

read the factory shop manual or connecting rod manufacturers info VERY carefully...FT LBS AND NM ARE NOT THE SAME
http://www.kylesconverter.com/torque/newton-meters-to-foot--pounds-force

http://www.homedepot.com/h_d1/N-5yc1v/R ... ogId=10053 very good

http://www.globalindustrial.com/p/tools ... paignId=WI better

I really think its not that critical, its far more important that the bolts are snug, and the threads have thread locker to prevent backing out from vibration, like I stated I use an allen wrench and grade 8 cap screws on most oil pump covers