BRB-83-911SC

84 Euro S - I have a Valeo alternator with no cooling shroud, and the cooling hose is just pointed in the general direction of the alternator. I have searched threads on the subject, but have not come across any pictures of alternators that look like mine. Question is, can a proper cooling shroud be fitted to the alternator I have? See pics - it looks like mine has some sort of plasic cover on the back - remove that and replace with a correct shroud?

Or, leave as is? The alternator is working fine, but I just wanted to properly connect the cooling hose if possible. Thanks.

Jadz928

Got one for ya...
Let see if I can get this shipped up to you faster than the last time.

jpitman2

Mine has a Valeo on it, and it has the cooling shroud, so they exist.
jp 83 Euro S AT 53k

Landseer

The thing that seems to be missing from the back of your alternator is the extended studs onto-which the cover fits.

jwillman

So I am also missing my entire cooling shroud / hose assembly. Is this a nice to have piece of German over engineering or is it more critical?

Thanks

993turbo

I have a Valeo on my 84 ROW S2 as well. The OE cover fits perfectly!

BRB-83-911SC

Yeah, that is my concern. All pics I have seen of the Valeo doesn't have the plastic cover as seen in my pic. I am thinking that that needs to come off before the Porsche shroud can be fitted, presumably with the same bolts holding the current cover on. I have not pulled the alternator from the car (yet), but am wondering if it is worth the effort, or just leave it as is.

Also, my car did not have the splash sheild when I got it, but I have one and will be fitting it, so I imagine with that in place, there will be less cool air getting to the alternator, which is why I am favoring getting the colling shroud/ductwork in place. Thoughts?

Landseer

Combined with very low placement on the 928, the alternator fan encourages entry of grit and possible wash-out with water. Use the duct!

Lots of times rebuilds jetison the extra-long studs that double as cover holders.

My speculation is that your alternator looks like it might be the right body, but rebuilt for another car that mounts it high and uses the plastic cover as partial protection. (Not sure if it's mounting arrangement masks the long studs or if the long studs are gone).

On your car, an enviable 84 Euro specimen, do it right.
Duct from the driver's fender (encompassing the air temp sensor) using the right hose.
Use Jim's cover.
If needed, ditch that alternator and replace with one from 928's R Us or another 928 supplier.
(Inquire, too, there might be a Bosch equivalent choice --- I don't know)

The 90A unit seems fine on Jim's 84 Euro, now housed here. (pictures above).


That said, here's another approach. I have two other 84 cars. They are running, unducted, Delco (88 camaro V6 or V8, 105 Amp). I did this at the time due to price -- having overspent at the time getting those projects running. Its a good thing to know how to make this swap, even if its just backpocket information for a long distance road trip. These alternators are starting to rack-up miles, maybe 20K on one, 12K on the other, no issues.

Both of these cars had Valeo when I brought them home. Both failed. Reason? I didn't clear the hoses of cracked nut shells, presumed left in the hose by mice. The nut shells entered the alternators, partially past the diodes. When they engaged the rotating internals, this ripped-up the diode connections. Road debris could probably do the same. One of the important things to do on rescue car is to vacuum the duct. So the duct is brilliant engineering. Engineers didn't forsee the mice situation.

BRB-83-911SC

Thanks Chris - just the nudge I needed.

Jim - PM me what you want for the cover.

I'll pull the alternator and see what is going on with the studs. Thanks guys.

Jadz928

Nothing, Brian. Pulled it from the spare parts bin.
PM me your addy, pls.

joehelendetroit

Landseer,

Do you have a link on here or elsewhere regarding changing over to the Delco unit?

This past weekend my mech cooling fan broke loose and trashed my radiator. The upshot is I am looking at an electric cooling fan and I am concerned about my stock alternator handling the added load.

Landseer

There are several threads about it. Many others before me did it. 928fixer from Chesapeake. Others. Sharkskin did a long write-up trying to use an even beefier Delco and duct it. (He said it ultimately worked but I got a little lost in the writeup. Too hard to duct a Delco I think, unless you are a real craftsman)
Pretty simple change.
Some of the earlier cars used a V-belt and required swapping the pulleys. (old alt pulley onto new delco)

Basically, you buy a plug pigtail to graft onto the harness. Its a 4 wire pigtail and only one of the wires is needed for the exciteer wire (little one). I think its the pigtail electrode labeled "L". The two heavy wires and lug are attached directly to the alternator + terminal.

The spacing requires 3 or 4 flat washers be placed on the pivot bolt to fill the space and shift the alternator forward a tad to align.

A shorter belt might be needed and there are a couple ways to deal with the tightening mechanism. I eliminated it and used a bolt. Others keep it and notch the bracket a bit.

Don't be too afraid of that viscous fan. On Jim's 84 Euro he replaced it with slightly small electric one. I want to switch it back. I've refilled the silicon fluid on a couple of the viscous fans to rejeuvenate them (it leaks out when they are layed horizontally for storage). Search for that if you are interested. You should be able to source a viscous fan and bracket for next to nothing from one of these guys here through networking. New price is too high as is some of the standard used pricing. I've never been able to understand what electric fan is best. All kinds of flotsam and jetsam out there on that. I've heard expensive ones from some suppliers fail, that junkyard foreign Ford ones are superior, that cheap ones range from great to lousy--- let me know what you find. Jim's is a bit small in terms of area covered, is pinned through the radiator fins, and the car runs on a tad on the hot side. Note that Jims is running on the 84 Euro 90A alternator --- no apparent issues.

Just search a bit on these topics and if you don't find what you need, post again your questions.

Sometimes stock is good enough. Viscous fan, new radiator and standard (ducted) alternator would be my spend choice. Maybe a bigger or dual electric fan and custom-wired ducted alternator if I had funds.

BRB-83-911SC

I pulled my alternator, it looks like no other pics of 928 alternators I have seen during my searches - and it's made in China. The cover says Valeo, with part # 14602, the label inside says Transpo.

Anyway, I will have to see if a cooling shroud will work on this one, but I doubt it. The clearance behind it when installed as-is is nil, so a cooling shroud won't fit with the back cover on. And, with the back cover removed, the alternator housing where a shroud would meet is not flat - it has stepped down areas. See pics.

So, since it is working well now, I am inclined to re-install it and run it as is, and if it lives a shortened life due to lack of cooling, so be it - I will replace it with a correct unit when it dies. It seems silly to spend the $$ now, when this one could run for another year or more. I can easily find a way to spend the $$ elsewhere.

jpitman2

Sounds practical to me, but dont let it become a habit! In the meantime, gather up the bits to do the job properly (as and when they become visible anywhere) so when the time comes, you have it all there - an alternator suitable for overhaul with shroud, and some new hose of the correct size/type. By all accounts the hose does supply useful cooling.
jp 83 Euro S AT 53k

BRB-83-911SC

Yes, my cooling hose was in place, just pointed in the general direction of the alternator, not attached to anything - not that this will do much since I think the alternator fan pulls air through the back.

Which brings up another question - is the temp senor's function diminished without the alternator pulling fresh air past it? Not sure how much air gets forced into the hose in the fender just by driving....probably not much.

I was going to get a new hose anyway, since mine was pretty ratty, and for now just route it as it was. Maybe best to just leave the hose off for now and just mount the temp sensor to the bracket on the splash sheild?

When the alternator craps out, I will get a proper set-up with shroud. I have had the car for just over a year, so the PO installed this at some point. Thanks!