5HP18 (A5S310Z) strip down

I've just moved house. Still dont have a garage but I've got a shed!:D I've kept my old tranny because I wanted to take it apart and find out what failed. I dont have the valve body manual but you can drop that without taking the tranny out anyway. I do have the workshop manual from ZF but it doesnt cover the VB. This may not be of interest to guys in the US as I think this tranny was only fitted to the 530 and M3. I dont want to bore everybody with another auto tranny thread but if anybody is interested I will make notes and take pics

I'm always interested in a post mortem diagnosis. Haven't broken anything for a while myself. (knocks on head)

BMW forgot to tell me they were closed for stock-taking today so I couldnt get the microfilter:(. Finished dismantling the tranny instead. Hadnt found anything wrong so far and the 3 machine screws that hold in the D/G clutches were proving akward. Once out all was clear - the spring ring in the D/G had disintegrated and 'shaved' the castellations off the top of the F clutch. Chunks were also embedded in between the clutch plates. Plates in the F clutch seemed a bit loose apart from that the tranny is fine....

http://i290.photobucket.com/albums/l...r/S7001307.jpg

Wow that looks scary! Was it still working when you took it out, or totally daffied?

Quote:

---

Originally Posted by e34.535i.sport

Wow that looks scary! Was it still working when you took it out, or totally daffied?

---

Car would move but thats about it. All the clutch packs fit in a line like a tube of rolos. You just take the valve body off from underneath (only the screws with the larger head or it falls into bits). Then undo the bolts inside the bell housing and they all pull out. The back end just bolts on.
I'd say it would be an easy job to refurb with the big BUT that you have to get the clearances bang on for each clutch pack or I think you may end up with a picture like mine

if I was younger and saw that example I would say neutral slam... yuk what a mess.

Nice... real interested in this. Are you going to rebuld her? A kit is not very much, but (I hear) the procedure is well documented in the manual. Have you read Bill Rs famous dissection of the 4HP22EH?

This is of interest to anyone outside the US as the GM trannies were not used in euro cars so much. 5HP18s are very common in the euro 525, 530 and 540s in Europe, Japan and Australia.

I've never even seen a GM tranny here in Oz.

and I wish I could find one, I have a filter kit for one I need to offload... :)

What we really need is a decent how-to to go with the ZF manual, so people would be encouraged to rebuild these trannys instead of scrapping the car... the trannys mst be a decent project for any shade-tree mechanic that with med-good ability. (which is why I haven't done one yet :))

Quote:

---

Originally Posted by genphreak

Nice... real interested in this. Are you going to rebuld her? A kit is not very much, but (I hear) the procedure is well documented in the manual. Have you read Bill Rs famous dissection of the 4HP22EH?

This is of interest to anyone outside the US as the GM trannies were not used in euro cars so much. 5HP18s are very common in the euro 525, 530 and 540s in Europe, Japan and Australia.

I've never even seen a GM tranny here in Oz.

and I wish I could find one, I have a filter kit for one I need to offload... :)

What we really need is a decent how-to to go with the ZF manual, so people would be encouraged to rebuild these trannys instead of scrapping the car... the trannys mst be a decent project for any shade-tree mechanic that with med-good ability. (which is why I haven't done one yet :))

---

I dont plan to rebuild it - I just wanted to find out what happened to it. That may change if the one thats in now (my second change!) gives up on me. The ZF manual is good but there is a seperate one for all the 5HP valve bodies and thats serious money. Tool wise you could probably get away with some sort of press and a dial gauge for the clutch packs though the manual lists a lot more. Will post some more pics and a fuller description of the disassembly if anyone is interested

Quote:

---

Originally Posted by whiskychaser

I dont plan to rebuild it - I just wanted to find out what happened to it. That may change if the one thats in now (my second change!) gives up on me. The ZF manual is good but there is a seperate one for all the 5HP valve bodies and thats serious money. Tool wise you could probably get away with some sort of press and a dial gauge for the clutch packs though the manual lists a lot more. Will post some more pics and a fuller description of the disassembly if anyone is interested

---

<subscribed>

I udnerstand that the main problem on high mileage/old ZFs is that the valve body gets fouled, making it feel really sloppy.

Once removed, compressed air through some parts of the valve body can blow out deposits and allow the box to change like new- going from a slushbox in slothmode to 'sweet'n'smooth' powerhouse again.

Would be good if someone with a rebuild manual could post it somewhere so we can all have a read. I've got a 4HP22EH to do soon, would like to know what to do with it valve bodywise at least. I know the A-clutches and shaft bushes will need to be replaced, but have no idea what to do witht the valve body.

You can get hold of a valve body kit like this for the 5HP18:
http://www.tsgparts.net/index.php?p=...d=94&parent=39
So I imagine you can get one for the 4HP22 too.
The 5HP18 manual is on cd but I wouldnt have an idea where/how to post it

The valve body you have to clean, put in new plastic balls, a new main gasket, test all the valves, clean them, clean all channels with brake cleaner and compressed air. That is it mainly. And the main harness of the valve body might have to be replaced, the plastic at the pin/spade connectors on the valves breaks for sure, but that is not the problem. I usually remove all the broken crumbled plastic and the connectors are fine. But the problem is the 7 (old version 8 pin) connector at the side of the transmission, have seen it often and at the moment also have one where the transmission fluid goes out of the transmission in the area around the pins inside the plug. These pins are in plastic but apparently over so many years it gets brittle. Then the whole plug fills up with transmission fluid and I have heard of cases that the transmission of the data between transmission and TCU was interrupted and caused transmission trouble.

That set costs I assume around $ 100, I would replace it, just just found it here on the site our friend posted
valve body harness 4HP22/24
product ID 1043 227 016
no price given there, pls check
http://www.tsgparts.net/index.php?p=...parent=41&pg=1

whow, here they are for >300$ for this harness
http://www.zftranspart.com/index.php...parent=47&pg=1

valve body overhaul ZF 5HP18 https://web.archive.org/web/20150918...aul-DIY-Part-1

Quote:

---

Originally Posted by shogun

valve body overhaul ZF 5HP18 https://web.archive.org/web/20150918...aul-DIY-Part-1

---

What a blast from the past. Classic writeup, that!! Thanks for reviving it from the waybarkchine!

BTW, @Shogun- where is the best place to buy a 5HP19 rebuild kit? The family car has thrown the front TC-Pump bushing and dropped some fluid out.

Of course I can't find a manual replacement, so switching to a real transmission would probably require importation of a 325 or 330i from Japan or someplace for parts... very few manuals in Oz :-(

I bought some parts from Maktrans in Poland, they have good prices + ship worldwide https://maktrans.net/zaptchasti-akpp...zf5hp19-fl-fla https://maktrans.net/index.php?route=common/home
compare prices with
https://www.thectsc.com/catalog/5hp19-3.html
https://www.europeantransmissions.co...lding-kit.html
https://www.oregonperformancetransmi...-5HP19-RB.html
https://www.transmissionpartsdistrib...7-07-a5s-325z/
https://www.fivestartransmissionpart...steel-1995-up/

if you know the p/n from ZF for the part your need, then google search with that ZF number https://aftermarket.zf.com/remotemed...pdfc-5hp19.pdf

Quote:

---

Originally Posted by shogun

I bought some parts from Maktrans in Poland, they have good prices + ship worldwide https://maktrans.net/zaptchasti-akpp...zf5hp19-fl-fla https://maktrans.net/index.php?route=common/home
compare prices with
https://www.thectsc.com/catalog/5hp19-3.html
https://www.europeantransmissions.co...lding-kit.html
https://www.oregonperformancetransmi...-5HP19-RB.html
https://www.transmissionpartsdistrib...7-07-a5s-325z/
https://www.fivestartransmissionpart...steel-1995-up/

if you know the p/n from ZF for the part your need, then google search with that ZF number https://aftermarket.zf.com/remotemed...pdfc-5hp19.pdf

---

Fantastic, thank you (xMillion!)