Oil Pump Gear Installation

[33GTRV]

Hi guys. First cab off the rank: This is a basic tutorial meant as an informative guide only and i accept no responsibility for work you choose to do on your own. Remember, if in doubt, consult your engine builder/machinist ALWAYS!

Ok, here ill show you a quick guide on replacing or upgrading your RB oil pump gears. Its relatively easy and pretty quick if the pump is out of the car.

Time: Approx 1hr.

Cost: Gearset(personal choice of OEM or aftermarket, i went aftermarket at $475) Loctite thread locker $10.99, Impact screwdriver $20 and a new main seal $unknown, probably about 10 bucks, Degreaser $9.99

Tools required: Impact screwdriver and bits, Small Ball Pein Hammer, Phillips head screwdriver, gasket scraper, small brush

Your pile of stuff should look like this

Directions are relatively straight forward, even for the not so mechanically minded. First of all, give the outside of the oil pump a good cleaning with some degreaser and a small brush to remove any excess grime and build up, if you have access to a small pressure washer, use it, makes it far more simpler, but remember, safety first, wear some goggles and the appropriate clothing and footwear if you do. After a quick wash it should look like this. Standard oil pump, in need of lovvin.

Ok, now, get the pump on a flat stable surface where you can get a firm grip on it and use the impact driver to loosen the backing plate screws on the pump.

Once all of the screws are out, carefully remove the coverplate, mentally noting where and how everything looks. Its a handy way to remember if you are sidetracked momentarily with something, like the kids for instance. After you have the backing plate off, it should look like this

Now carefully remove the gearset inner and outer, noting where the timing marks are.

Once again, its time to clean the pump. Clean clean clean! the cleaner it is the better it is. Now its clean, its time to wipe a small smear of grease onto the face of the pump housing that the gerotor rests on like so, you dont need alot here.

Now its time to install your new OEM/aftermarket gears into the housing. I places the inner gear into the housing first then gently layed the outer gear into the housing second. As you can see here ive gone with a Spool billet gearset that utilises the same wave design as the nismo and n1 gearsets.

Now check everything is snug, everything is clean and everything is in the right place. If all is as its supposed to be, its time to place the cover plate back onto the pump. Gently place the cover plate over the gearset (this only goes one way, so if you fcuk it up, you really need to go and get hammered) Now, i have seen far too many oil pump components in my time rattle loose under harsh operating conditions, so its a preference of mine to use a small amound of Loctite thread locker on the cover plate screws. You dont need to bath the things in it, just a small portion on one side of the screw as it will be pushed around the thread once its engaged into the housing.

Now, make sure you have got enough loctite to just cover the countersunk underside of the screw when it is torqued too, its a good habit and will guarentee they wont work themselves loose during thier life cycle.Torque the screws up firm and youre ready to go! DO NOT USE THE IMPACT DRIVER TO TORQUE THEM UP! There is an almost certain chance you will strip threads ot damage the housing. Demonstrated below

And finally, the reason for the replacement. This is not actually the pump out of my car, it ingested a washer and the housing was shagged. This was a pump i picked up cheap and as "Condition unknown" but this is the start of a very sinister ending for an engine. The crack has started to form after what looks like its had a few limiter bashings as pictured below.

Hope its of some help to you all and if there are any variations ive missed, let me know so i can edit them in. HAPPY HUNTING!

Cheers, Allan

[JonnoHR31]

Very nice writeup, will definately come in handy down the track when i get some of those gears. Thanks

that cracked gears looks like its seen a lot of limiter abuse, the point where its cracked is right where the crank hits it when it hammers back and forth. disaster waiting to happen, lucky you pulled it apart.

[33GTRV]

it wasnt the pump out of my cat. It was a second hand pump i picked up for a 10 pack of rambo's. My pump looks like a small torch has attacked the houring and gearset lol. Ill be doing a writeup on the pump when i get closer to finishing the build, i might even make up a bench jig to test the flow and pressure, or send it away to someone with one, depends on how creative im feeling.

[33GTRV]

my god, the iphone autocorrect is garbage! this thing needs to be run over lol

[JonnoHR31]

it wasnt the pump out of my cat. It was a second hand pump i picked up for a 10 pack of rambo's. My pump looks like a small torch has attacked the houring and gearset lol. Ill be doing a writeup on the pump when i get closer to finishing the build, i might even make up a bench jig to test the flow and pressure, or send it away to someone with one, depends on how creative im feeling.

yer i know, just saying its lucky you didnt just throw it on without pulling it apart like i probably would have