96 5.2 Air-conditioning pump

Hi, Paul
What's up with your old one? Unfixable? Ferrari distributors don't have any in stock?

I spent a few hours with Google, researching Sanden compressors.

The original "SD7H15 7840" (7 series) model seems to have quite a few differences to the SD7H15 8048 (8 series) model. Whether these differences are important, I'm not sure.

I wasn't able to determine if the pulley was detachable from the clutch. If not, you may have problems. The OEM clutch has a keyed shaft and the 8048 has a splined shaft.

There are cheaper (probably Chinese) compressor alternatives... see:

http://www.ferrarichat.com/forum/144549266-post529.html

Remanufactured ones also seem to be available:

Order Ferrari 02 7H15 PV5 | Sanden compressor 157355,7840

Not local, however, so postage might be a bit steep.

I was looking at Sanden's FLX series (flexible series) and the Enhanced SD7H15 series, but it looks like the OEM 119mm PV5 (5 groove) pulley isn't available for these.

If the pulley is a separate part and it's bolted onto the clutch in a similar manner on both clutch types and you could transfer your old pulley to your new compressor, you would still have to make sure it sits in the right position in relation to the compressor mount faces. When looking for compatible compressors, I believe the dimension to look for is the centre of the pulley to the mounting face (i.e. of the lugs or "ears" as they call them).

Here's some specs for the 8048:

"CO-55792 8048 SD7H15 12Volt 8V-type /132mm diameter pulley. Vertically oriented hose connectors. Standard lug mount. Original charge (?) 135cc. Dust cover. Splined shaft. Rubber armature. Clutch part number is EC-132PV81CA.

Here are some specs for Polarbearinc version:

https://www.polarbearinc.com/index.cfm?fuseaction=product.display&product_ID=11262
Compressor Description For SD 7H15 Model # 7840
Sanden Part Number: 7840
OEM 157355
PBI Replacement Part Number: CO 7840F
Mount Type: Ear Mount
Rear Head Code (raised lettering on rear head of compressor): CB ("Cylinder head")
Hose Fitting Type: Vertical 1" X 14
Vertical = Fitting on top or on side of rear head
Horizontal = Fitting on back of rear head as opposed to side or top
Pulley: 119 mm Diameter 5 Groove Pulley (Identical to OEM pulley)
Coil Voltage: 12Volts Number of Wires: 1 with diode to ground and factory connector

All SD7H15 have these specs:

7 cylinder swashplate
Capacity 155cc
Rotation Clockwise
Max continuous rpm 6000
Refrigerant type R-134a

Here's a few more links with dimensions...

https://www.highgateair.com.au/images/stories/products-pdf/Compressors.pdf

https://www.highgateair.com.au/images/stories/products-pdf/Clutches.pdf

It seems you can still buy some parts for the OEM type (bearings, seals, etc), so, depending on what's wrong with your old one, you could probably hand the compressor to your local repair man.

Sorry, no real help.

Cheers
Ian

 

I still have no idea. I hope my message didn't suggest this?

Looking at this video, it actually shows the disassembly (may require some specialist tools)...

https://www.youtube.com/watch?v=tJR1NGoMI7M

The clutch appears to consist of:
1) the hub at the end (which has the keyed or splined hole to match the drive shaft).
2) the pulley (held onto the assembly with a circlip)
3) the electromagnetic coil/doughnut

I can see all sorts of potential problems matching the old pulley to the new compressor:

Compressor drive shaft length
Pulley inside diameter in relation to drive shaft and the magnetic coil and the collar around the drive shaft
Location of groove on the drive shaft(or whatever?) for the pulley circlip
Location of the shoulder on the shaft (?) where the pulley sits
Etc..

As I said, there appears to be no 5-groove pulley options for the latest SD7H15 type compressors, and I don't know the reason why.

Time to call in the specialists (ask Sanden?)

Cheers
Ian.

(EDIT)

The video shows that the pulley is not bolted onto the clutch. It's just held in by a circlip.

 

P.S. Apparently there is some shimming involved when replacing clutches.

https://www.youtube.com/watch?v=bt5-Mf5tk40

 

Is a 23 year old compressor easier to find, Paul?

According to this site, it's a "special build"..

http://www.autoair.co.nz/site/autoair/files/PDF%20FILES/AAA%20Application%20Guide.pdf

Also, the CM7986 has a 6 groove pulley, so you would need to change that, too. Does your source say that your existing pulley can go on the 7986 clutch or will you have to transfer the complete clutch to the new compressor? Note: According to one website, there are 3 different kinds of SD7H15 clutches.

Cheers

 

Excellent. I guess a couple of millimeters fore/aft doesn't make much difference.

It still would have been nice to have been able to fit one of the enhanced SD7H15's. They are supposed to be more efficient (15%~20%). I wonder why they are not compatible.