Need help on part nr.

[marxx]

Dear all

first, greetinx from Munich, Germany. It is long time, since I last wrote and a lot of things happened.

I got my permit as historical vehicle for my 79 Oldsmobile Starfire, so she was regualry back on the road. Which ment, that now all parts that could wear out, started to wear out

It is quite a list what needed to be done in the past time. Engine mounts, fuel pump, master brake cylinder are just a few little projects that needed to be fixed. Now the cooling fan clutch has gone.

I ordered a Hayden 2705 in the US, which arrived last week. Today I wanted to swap the clutch, but (surprise) I got the wrong clutch Alltough I did a cross-check at several part dealers on the part number, it will not fit (see picture).

IMG_20140928_145648.jpg

The original clutch is on the left, the wrong Hayden 2705 is on the right.

It seems to be the same as with the engine mounts. "Normal" 305 V8 parts just won't fit right.

As I want to keep the car as original as possible (she is one of seven that came to Europe 1979) a conversion to an electric fan is only an option, if anything else failes. So here my question:

Can anyone provide me with a part number on a fan clutch for my stock 1979 Oldmobile Starfire SX (305 V8)?

Many thanks in advance

Greetinx

marxx

[cjbiagi]

There are different clutches for with AC or without, what do you have? Also, is there any markings on your original clutch such as "CN" ot "AC" etc?

[marxx]

Thank you for your quick response.

The car has an AC. On the clutch it says "EVANS". No serial numbers ...

[cjbiagi]

I remember someone else having this same problem many years ago, unfortunately I don't remember the outcome. Can you provide some measurements on both clutches? Overall height, height from the clutch to the top of the fan mount (how far out the shaft sticks) etc.

[marxx]

I can do that next weekend.The car (and the clutch) are at my weekend house outside the city.

While waiting, is there any information from official GM part catalogues available?

[Stonebird]

My book shows 461303 for AC and 460760 without AC.

[marxx]

Thanks a lot

I entered "gm 461303 oldsmobile" at google and got this as first hit:

http://www.gmpartswiki.com/w/461303

Awesome site. But the site could not confirm, that the part number matches the 79 Odsmobile Starfire (which does not need to really mean something).

As I already got the wrong part shipped over the pond and I can't just walk into a shop for Oldsmobile parts here , I'm a bit uncertain ...

So, sorry being perhaps a bit persistant, is there more information available?

[stage169]

The model H is shown so it should cover your Oldsmobile. Found a NOS part too, if you want I can call and check on the price and if it is really the part you need. Brian

[marxx]

The model H is shown so it should cover your Oldsmobile.

That was the missing link Now I'm more certain for my next US ordering adventure ...

Thanx for your offer to check for the price. I will first take a chance to dig the net by myself. In case I get lost on the web, I will post another cry for help here

Anyway I will post some measurements of the clutch here next weekend.

Thank you all

Greetinx

marxx

[kre25]

Here is the part you may need. That year had an optional Fan Clutch.
All of the specs for the part are included with the link.

Hayden #1705
http://www.oreillyauto.com/site/c/detai ... &ppt=C0331


The Hayden #2705 you received does not look correct, too tall, may have been boxed wrong at the factory. Here are the specs for the 2705.
http://www.oreillyauto.com/site/c/detai ... &ppt=C0331

I work for O'Reilly's, that is why I choose to give you our link.

Hope this helps.
kre25

[marxx]

Hi kre25

Thank you for your input. A bit confusing though

I did some measurement this morning (its a holyday today in Germany. Reunion day ... ).

The diameter of the original clutch is 7.2 inch, the overall height is 2.2 inch and the flanch mount height is 0.7 inch. These are approximated sizes, because I did the measurement in centimeters and converted the values to inches.

From your website I got this information for the Hayden 2705:

Fan Hole Bolt Circle (In): 3.250 Inch
Fan Mount Diameter (In): 2.620 Inch
Fan Mount Height (In): 1.530 Inch
Flange Diameter (In): 2.600 Inch
Number Of Bolt Holes: 4
Overall Diameter (In): 7.200 Inch
Overall Height (In): 3.110 Inch
Pilot Depth (In): 1.030 Inch
Rotation: Standard
Thread Size: 5/16-18 Inch

So I checked my Hayden 2705 with these values and found out, that it really is a 2705 that I got (overall height 3.11 inch).

Hmmm. My Starfire is, as far as I know, completely original (except for the painting). That raises the question on a possible error in the part databases of the distributors ...

The mystery gets bigger and the quest continues

[cjbiagi]

I think the 2705 and the 1705 are basically the same heights at 3.1" The 1705 is a non thermal style meaning it is not heat sensitive and just turns the fan at a slower rate. The thermal one kicks in depending upon temperature.

[marxx]

The more I search, the weirder it gets ...

I found this link here:

http://www.haydenauto.com/upload/hayden ... clutch.pdf

An official Hayden document. The 79 Starfire is listed in this document and guess what ... With the 2705

[marxx]

This post could be titled "a 50 $ lesson learned" ...

As I could not find any fitting clutches in the Hayden document, I started thinking about other options. While thinking I took a closer look at my original clutch. What I saw was tons of dirt and crusted oil around the bithermal spring of the clutch. So a keen plan rised. Cleaning!

Well to make a long story short. I cleaned the spring, remounted the clutch, drove a few kilometers and tada ... The clutch is working

So first measure, then order. But most important: Before spending money, try cleaning

Well, this little adventure does have its good side. I now know, that this clutch never should brake, because it is weired and some how non standard.

And I now have a brand new Hayden 2705 to give away. If anybody is interested, it can be picked up here in Munich, Germany

Greetinx

marxx

(on the road again)