4A-GE/GZE Oil Pump Mods

[RT40Corona4AGTE]

Forgive my ignorance, I have tried searching the forums with limited results, but what is the infamous oil pump washer "trick" a few threads speak of which is said to raise oil pressure?

Can anyone provide direction to the thread or supply pics of the modification and instructions?

Sorry again for my ignorance ..... lol

[oldcorollas]

there is a small plunger that is the pressure relief valve. it is inside the oil pump body. if you put a washer under the base of the spring, it pushes against the plunger more, so it takes more oil pressure to move it.. so oil pressure in engine is higher.

basically, increaseing thickness of the retainer 15135 in this pic
http://opc.mr2oc.com/online_parts_ca...oil%20pump.GIF

[30psi 4agte]

It is easily found in the tech section of club 4ag

[Grega]

i knew you'd posted this somewhere before stu ;



the washer goes above part 15135.

[allencr]

I have tried searching...
what is the infamous oil pump washer "trick"
Sorry again for my ignorance

Besides just doing it, also make sure that you find out & understand what that spring in the oil pressure relief valve actually does, what benefit it is and what are the dangers if the relief pressure is increased too much, or the valve gets jammed, either open or closed.

IMO, There are few, if any, old tired engines that this will help or improve.

[oldeskewltoy]

the washer goes above part 15135.

Above???? Above it it won't fit without teetering????? Below... it will act as a shim... increasing spring pressure by just the thickness of the washer. Or have I misunderstood something...................

[Grega]

OST..........above......as in b/w 15135 and the 96151-01500 circlip
shimming this (and by how much?) apparently increases oil pressure supply?

[Grega]

OST
if you look at this pic i took when i put my pump together

basically oil is pushed out where the black hose is plugged into - that hole feeds the oil squirters and that gallery in the block
so if the oil is pushed thru that channel ; towards that black hose ; if you see where the spring/plunger sits with the hole in the side for the relief ; if the pressure is built up such that the plunger is harder to be depressed by the fact the washer has been put there (and the spring tension is increased) the oil pressure *should* therefore be higher.

i can't really see much value in doing this over factory ; toyota engineered a good product so there should be sufficient oil pressure to do the job (look at the amount of folks who run the NA rb30 oil pumps in rb30et conversions)

[oldcorollas]

TOSCO manual suggests a 2mm spacer for K motor pumps, to increase the pressure.. i guess the benefit is having alightyl higher pressure to maintain oil films, but if you run out of volume or have too much clearance, it will not help...

usualyl the relief valve is bleeding off pressure after what? 3000 or 4000rpm? so there i sprobably plenty of scope for increasing pressure and in a way, increasing flow.. since you are bleeding off less oil?

[Grega]

stu in a forced (beit turbo) application theres probably benefits due to the extra oil supply to the turbo.....but not 100% sure what the increased pressure would do for you that you wouldn't get out of whats already there..

[oldcorollas]

yah, i am not sure..
you just need enough volume at X pressure so you don't lose pressure int he bearings.
if you have enough pressure, then higher pressure will just increase load on oil pump.

if you lose pressure, the shim has no effect anyway... the extra pressur emight overcome design shortcomings, such as not enough flow to cams or valve train or something..
turbo has restrictor, so the extra pressure would only be worse for that..

i guess, for most engines..(like many mods) if you don't know whay you need it, you probably don't

ps, don7t let river see that sig

[RT40Corona4AGTE]

thanks for the replies guys, most interesting! +rep all round.

[oldeskewltoy]

OST..........above......as in b/w 15135 and the 96151-01500 circlip

Ok, thats what I thought... I was looking at the photo... and "above" 15135 is the spring.... I had a feeling we were talking the same thing just withe different POV

[oldcorollas]

just remember it needs to have a hole in the shim/washer

edit: wait.. maybe i am thinking of a differen tpump...

[Grega]

RT40......yeah depends on what you wanna do mate as to whether this mod is worthwhile
FWIW getting that circlip back in is a pr1ck of a job.

and yes, can't be a solid washer either....nice one stu (do you ever sleep?)

OST.........yes mate....couldn't go under the factory washer as there's a bevel/curve in it so has to go on top b/w the circlip and the factory waster/spring retainer. and yes, different POV's aue