ZF 3HP22 - goes then stops after 5 mins

Post your E12 technical questions and comments here. Please, no off-topic posts.

Moderators: Mike W., Pierre

Post Reply
garyinwestoz
Posts: 141
Joined: Thu Jan 29, 2009 9:05 pm
Location: perth, australia
Contact:

ZF 3HP22 - goes then stops after 5 mins

Post by garyinwestoz » Sun Jun 21, 2020 10:23 am

Ive been trying to figure out what is the underlying issue with my 81 528i auto box

its a ZF 3HP22 unit
engine starts - and can forward or reverse okay

then if drive for like say 3 mins - - changing up and down gears AOK - then - all suddenly all drive to wheels stops. If I turn engine off - wait a few minutes- then start again can drive for 5 mins, before looses drive to wheels again.

I am wondering if anyone could have a look at this ZF 3HP22 manual

http://peugeot505.info/files/manuals/505_3hp22.pdf

and tell me what part I need to have a look at.

my suspicion is that its the hydraulic block - or maybe the pump - but would a pump stop working after a few minutes?


I complied a drawing sheet from the manual to assist.

Image

Ive attempted to remove the hydraulic block, but 3 of the torx head screws I managed to strip! :(
so I removed the rear plate instead and checked out the pistons -(no 14 - 20 ) I'm not sure but I think the No 13 main pressure valve might be stuck (not sliding freely) - unless there is something that is meant to stop it of from coming out - the two springs holding it in are real stiff!
77 528i -4 speed manual getting rusty
76 525 - 4 speed manual LPG and holley carb
81 528i - auto - to be relicensed with a 3.5 (83 735i)
79 SA ? 528i auto
79 528i auto parts car
86 525e 5 speed manual

Post Reply