Coil discussion

[Suboval]

[tasb]

I'm not seeing any mention of the fact that most Bosch parts, including coils have a date stamp on them. The code listing is in the Split Beetle FAQ's.
_________________
Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018

1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc

1961 (October)Single Cab- Road Trip Workhorse

[tasb]

I've just finished a group of coil testing/restorations. Two of them are curious abberations perhaps?

They are wide diameter TK 6 A 3's. according to the Bosch documentation that Andy (Glutamodo) and I were able to uncover these were used from 1947-1951. That's all fine except these coils have odd date stamps One is a bit vague but appears to be 2Q which is February 1961 or it could be 2 G but the G would have to be a lower case "g" which I have never seen on a Bosch part. The other coil is 5 S which is May 1959.

Andy and I would like to turn the question over to the collective consciousness: Would Bosch have manufactured these old large outdated design coils clear into the early 1960's?

I do know from my distributor restoration exprience that they continued some distributor designs and of course tune up parts for several years after they were no longer being installed on VW's.
_________________
Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018

1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc

1961 (October)Single Cab- Road Trip Workhorse

[tasb]

Here's an interesting coil that needs some sluething. It was removed from a split window Beetle many moons ago according to the seller.

It is 62.7 mm wide and 120.9 mm long not including the bakelite cap. Besides the 1 and 15 terminal markings the bakelite has a symbol that looks like a early Bosch "B" inside the circle with two horizontal lines. The clamp though has a five pointed star with what looks like "AVP" inside it. The bracket is original to the coil and is marked TL to the left of the star and 6/1 to the right.

It has 0.O4hms resistance from secondary to secondary and 6.6K ohms from secondary to primary. It appears very primitive with a rough lap joint to the jacket.

I know that before WW II Bosch had to partner with other firms located outside the Axis Powers in order to produce items in quantity and this may account for the odd maker marks. Any thoughts welcomed and appreciated.

I've searched pretty thuroughly for a date stamp but the housing and clamp are pretty rough so I may have missed it.
_________________
Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018

1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc

1961 (October)Single Cab- Road Trip Workhorse

[janerick3]

[johnshenry]

To bolster the argument that the TL 6/1 was used before November 1, 1950; I have 5 of these coils, the date codes are:

12D Dec 1948
2F Feb 1950
5F May 1950
7F July 1950
8F Aug 1950
_________________
John Henry

'57 Deluxe
'56 Single Cab

[Brad Ripley]

Here are relevant pages from Bosch catalogs, dated Oct 1950 and Jan 1962 . Hope it helps with the discussion.

[johnshenry]

Is the TE6A3 the fat star coil with the lipped bottom? A link to a pic of one earlier in this thread is dead.
_________________
John Henry

'57 Deluxe
'56 Single Cab

[Suboval]

[Suboval]

Does anyone have anything else to add? Needs to be changed?

1946-1948: TL 6/1 moon (non star)
1949: ?
1950: TL 6/1 (star)
1951-1953: TK 6/3 (TK 6 A 3), TE 6/3 Zwitter?
1954-08/13/1956: TE 6 A 3 (Early on bakelite, later on the end of the coil)
08/14/1956-07/1960: TE 6 B 1
08/1960-1963: TE 6 B 4

TL 6/1 moon coil

[johnshenry]

To add, I picked up a "fatty"in Hessisch that is date coded 5F, May 1950, so they were making both kinds in the same month!?? And I have another skinny one with no date code. I have glass beaded it and looked at it with a magnifying glass, and there is no date code there....

[Suboval]

[johnshenry]

[56samba]

[johnshenry]

[vintage fiberglass]

I just picked up a TE6/1 coil that has 3 posts on the top and it came off a 1948 engine?? Does not mean it is correct, but that is where it came from. Looks exactly like the fat coils with a smooth bottom but 3 posts? any ideas?

[56samba]

[Frederik]

[Frederik]

I don't think the "from january 1954" change in the vw workshop manual refers to the change of coil but the change to "vju" style distributors and because of this should not be taken as a proof of thats when they started using the TE6A3 coil. It also important to remember that the part VW/ Bosch refers to in the old manuals might be what they thought was the correct when that manual was printed, and that is not always what was correct when the car was built.

From the Swedish official VW workshop manual (1952-), but this two papers are printed/updated 1956 and 1958. I think the "TK6/3" is strange as Bosch would have used the TK6A3 "numbering" by then/ at least from 1952. I don't know the exact date for this, but TK6/3 was replaced by TK6A3, TE6/3 -> TE6A3 and so on. I know the pictures are "generic"/ "re-used" but it clearly no TK6/.. coil in any pictures, maybe TK6A.. but I doubt it. This makes me think the "TK6/3" might be a printing error, they (VW) intended to use the TK6/3 or that it might have been correct for a short period when they first printed the book and they just left it there/ didn't uppdate it. I would trust HeSa's 1952 Bosch blue Book more on this. You also have the chassie number 1 261 493 when they changed to the TE6B1 coil.

This is from the Bosch parts Book printed 1958.

And they list the TE6B3 as spare part for all VW and TK6A4 (thats a blue coil) for all Porsche except carrera. With this I just want to highlight that you should take what they list as spare part and what was on from factory as two different things when looking in old books. Even when they are printed in the correct era.

TK6A4 blue coil. Also stamped in the end not bakelite. Date code 12H = december 1952.

[noheb]

Hi, am I correct that the coil
TE 6A3 (11.1950 to 8.1956) had various designs?

- Star coil

- Lipped upper edge but no star in the top

- Tall coil with loose strap with oval hole

.