1973 Oil Tank Questions

[HughH]

My memory is that it is separate. I had a couple of small holes repaired in it about 6 or 7 years ago and my memory is that I removed the console before giving it to the radiator specialist to clean and repair.

[frankc]

my engine is currently out of the car (fixing the gearbox shown in another thread) but i took these photos today. I could not get any better ones as the car was up on the hoist with another car under it. but without the engine in it, and from below you get an idea of how far it comes down. My car is a late June 73 build and i believe the oil tank is original.

Hugh,
That appears to be the same tank as the on in my Post #7 - what seems to be the earliest of '73 tanks (short with separate filter console). This is the style of tank that I am seeking for my '73.

So given that your car is a later build '73 and has this style tank, this brings me back to my question of when folks say that the '73.5 tank is different, are they referring to only the US CIS cars, or all 911s built after Jan '73? The data seems to be pointing towards the former (but why?), although as E Sully points out - nothing is certain.

[gled49]

Hugh's tank pix in post#38, second pix from the side is the short tank with separate console, you can see oil filter crimp. Non console pix, crimp is buried. I would be suspect of tanks in restored cars as most have non repairable perforations, especially euro cars. The red and yellow cars? Also tanks with the screen rock guard look correct. Gled

[911MRP]

This is the correct console 911.107.671.00 for the ( early) model year 73 tank. Measures 1 ”across the male thread I”12 UNF.



The matching filter is 1”12 UNF thread female whereas the earlier more common similar looking consoles (before the very different ones for MY 72S ) have the smaller UNF thread to match the filter. Earlier thread is smaller 3/4” - tad over 19mm. Other than the threaded piece being 1” vs 3/4 UNF sure if there is any difference ? Not compared the diameter of the centre hole see if that is correspondingly wider?

This is a spare 911.107.671.00 I have for my early 73 RS. The original tank and console are fitted to the car. Perhaps not a part that needs a spare much but have seen them corroded so why not keep one for a long term owned car.

Later different tanks from around end of 73 with the different details are not correct for the early homolgation RS for while differences maybe not immediately obvious unless look inside under lid and under the car important nevertheless for folks who care about authentic to original spec. Whike a the crest orange vs red gets examined the tank that is different ( integral console, capacity, shape, length etc) doesn't seem to get scrutinised. It’s one of those many things that should be correct — that’s probably why I have long had this console tucked away as a spare.

The books in the background are my original Purolator catalogues from 73 and 74/5 showing applications including the correct filter parts Porsche and Purolator numbers as were at that era.

I realise a lot has been added to the thread since the OP started with this:

I know that the '73 911s had a one year only oil tank (911.107.006.11) that is somewhat a hybrid of the '71 & '74 tanks (copper tank with separate filter console similar to '71, clamp-on S-hose, oil filter size & fixed filler tube from '74), but I have seen many suppliers selling the '74+ style stainless steel tank for '73 - '89 cars.

However worth pointing out the original tank for model 73 back in the day was not this Porsche part number (ie not 911.107.006.11 the number underlined in quote). I suspect it was obtained from PET? While PET being online is handy to look up things quickly its contents can confuse regarding original part authenticity since what were the part numbers of the original back when cars were new can get obscured by numbers of later replacement parts — this is due to how part supersession gets recorded by by what we see in PET. 911.107.006.11 first appears in the factory part book updates maroon binder paper — appears on a page dated about half way through model year 74! Tank with part number 911.107.006.11 came as a supersession part late in the model 73 cycle. While there was a lag in producing the paper manuals and they’re not always without fault 911.107.006.11 is not really the correct part for (much of model) 73 911 even if done got used on some 911 towards the end if that years production.

Cosmetic things like an orange crest badge get noted but much this much more fundamental thing — the correct and compatible combination of oil tank, mounting (console) and appropriate filter, less so.

Steve

[911MRP]

This is my spare one year only for model 73 console with an old filter a genuine ( not repainted Mahle or Porsche Classic) Purolator orange filter dating from 87 it has the P symbol



1”12 UNF female thread compatible with the somewhat rare used for part of one year only console’s male thread.

While the filter is an old original it seems to date from 15 years after my car was made

This tatty used filter was removed from a 911 2.4 whilst car in my friend’s workshop it had stood for decades untouched that’s why I saved the old filter from the dumpster as an example reference to how these Purolator Porsche orange filters were back
in the late eighties.


Steve

[911MRP]

Here are some photos of 73 tank with screen and console, also 74 as pictured above. My drain plug is the late one with the 15mm hex, I put a level on bottom of drain plug straight back to bumper bottom, almost level. + 73 tank out of the car. Gled

This is the correct 73 tank with the separate “
1”12 threaded console

It has this filler and bayonet closure

The example I have is similar length to the 73 example in the post based on a quick measurement ……


In addition to the more obvious integral console shape at bottom (area in green) is different to the very late 73 (74) where the rear was reprofiled to accommodate the rear G-series impact bumper absorber mechanism (as was pointed previously out by gled49):
. The U shape also seen in Hugh’s pictures.
Made of steel with what looks like copper plated layer then a further layer of black paint

The wider section at base measurement at bottom near the drain plug thread:


Steve

[RSTarga]

Some shots of my May 73 oil tank:

[911MRP]

David, it is the separate console type that I would expect.

Do you have any that show the shape beyond the green arrow I’ve added? Interested to see the shape shape both sides of the pipe ?

Did the drain plug they used change on the tank ? If so when?

Steve

[RSTarga]

Here you go Steve:

[911MRP]

Thanks you’ve had your model 73 car from new so it’s a good reference assuming the tank not changed as part of the RS upgrade engine work. It is as another example clearly showing the difference to the 74 versions that might have been used very late in model year 73 which are larger, taller and have a different shape in that particular area near the hose connection.


The 72/3 factory spare parts maroon parts book ( paper not PET) doesn’t specify the drain plug form in the description but the shape of the drain plug (#11) in line drawing seems to suggest it’s a shallow hex (or maybe in-hex aka Allen) shape. 72 and 73 have different suffix for the closing screw .00 vs .01. Hence my question — was there a change to the drain plug at some point in the period 72/3 related to this ?

The different drain plug in the plate / screen under engine casings was certainly made taller during model year 73 but not sure if the one for the oil tank was changed in that period.