4AGE oil pump

[Grega]

I'm in the middle of cleaning bits prior to starting my 100kw rebuild
All the gear is back and honed and nice and clean
Just took my oil pump apart to get the gasket off it and noticed the relief valve thing
Got the circlip pliers out to find a spring, a hat and a little enclosure it sits in with what looks to be a piston at the top with a relief valve or two in it

My question is, does the piston move up and down the bore as it appears stuck firm. I'm soaking it in some INOX to see if it will free it up as its gummed up, but don't quite understand how this relief valve thing works.

Anyone know for certain?

[Grega]

ok so it appears it should at least come out.
i can't seem to remove mine (even after a soak in INOX)

any thoughts on how to get this little dude out?

[too_quick]

I know nothing about 4AGE oil pumps but have 1 bigport pump that works well, If it will fit its yours free.

[oldcorollas]

pump diagram
valve 15131 should move down to compress the spring to relieve pressure?

[Grega]

des. thanks - they appear different in the drive gears.
stu - i found that same diag lastnight. concur - the piston should move up and down.

now to unstick mine and get it out. more inox soaking FTW

thanks guys

[Cuzzo]

Is it relatively new? If not go a new one if you have the cash.

[TooF]

they are only about 200 bucks brand spanking from toyota iirc.

not worth recycling an old one in a fresh engine.

[oldcorollas]

if the gears are ok, then may as well reuse it....

can you get somthing into the port to try and lever the piston up and unstuck?
can you get an airline onto it? (and somethign to catch when it pops out at high velocity )

[TooF]

true the clearance on the rotors can be just fine but doesnt mean that they arnt potentially about to crack.

the TRD oil pump (now discontinued) didnt flow any more oil or higher pressure it just had stronger rotors to cope with high rpm use so failure of the rotors is a known issue. for a new engine youve just spent countless dollars building a new pump seems like good insurance

oh and if you pop it out with compressed air best thing to have it shoot into is a nice soft piece of wood to prevent firstly it flying across the room but also to prevent damage to the piston. much like when you disassemble brake calipers.

[Grega]

oooh yeah
air pressure
never thought of that
more heads are better than one

the innards of it look ok actually, so yeah, into a piece of wood it goes
time not on my side a great deal, off to sydaney next week (again)

[TooF]

just a thought.. if you are pressed for time last time i checked toyota carried these in stock in australia.

[Grega]

TooF - know who i can talk to, to get one?

[TooF]

part number 15100-19036 your friendly toyota dealer should be able to help you out.

[Grega]

$260AUD out of local toyota dealer - has to come from sydney though

[oldcorollas]

from this pic it looks like at worst you could drill a small hole in the plunger to try and get it free... it shouldn't affect the operation as the end is what is pushed by the oil...