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76 400 four valve stem oil seals

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Chris400F:

--- Quote from: llessur on January 01, 2017, 07:59:13 PM ---That makes sense- thanks. What originally through me was that I had downloaded the Workshop Manual from this site and it shows eight seals, however on checking the parts manual it only shows four.

--- End quote ---
I noticed that too. It is in the 350 section of the manual though, although it says nothing different in the 400 section.
I had a look in the Haynes manual; that says the seals are only on the inlet valves.
Final clue was in the 350 Parts List. Early models (prior to a given engine number) had 8 seals, after that only 4 were used.
So as Orcadian says the inscrutable Japanese accountants possibly decided to save a few Yen and deleted the seals on the exhaust valves.

Trigger:

--- Quote from: Chris400F on January 01, 2017, 10:31:17 PM ---
--- Quote from: llessur on January 01, 2017, 07:59:13 PM ---That makes sense- thanks. What originally through me was that I had downloaded the Workshop Manual from this site and it shows eight seals, however on checking the parts manual it only shows four.

--- End quote ---
I noticed that too. It is in the 350 section of the manual though, although it says nothing different in the 400 section.
I had a look in the Haynes manual; that says the seals are only on the inlet valves.
Final clue was in the 350 Parts List. Early models (prior to a given engine number) had 8 seals, after that only 4 were used.
So as Orcadian says the inscrutable Japanese accountants possibly decided to save a few Yen and deleted the seals on the exhaust valves.

--- End quote ---

Not deleted Chris, upgraded from 4 seals to 8 seals. All the early engines never had the seals on the exhaust valve guides, even on the 750's.

Chris400F:

--- Quote from: Trigger on January 02, 2017, 06:52:14 AM ---Not deleted Chris, upgraded from 4 seals to 8 seals. All the early engines never had the seals on the exhaust valve guides, even on the 750's.

--- End quote ---
That's not how I understand it from the Parts List Trig.
This is the text from the 350/4 Parts List:

[ Guests cannot view attachments ]

So up to engine number 1068969 there were 8 seals (for inlets and exhausts) then from engine number 1068970 there were only 4 (inlets only).
Not sure what the 2000000 series engine numbers are, a different market maybe?
The 400/4 Parts List also only lists 4 (inlets only).
I'm presuming that the 350 manual was put together in the early days which is why the diagram text shows 8 seals.

kevski:

--- Quote from: Chris400F on January 02, 2017, 10:03:12 AM ---
--- Quote from: Trigger on January 02, 2017, 06:52:14 AM ---Not deleted Chris, upgraded from 4 seals to 8 seals. All the early engines never had the seals on the exhaust valve guides, even on the 750's.

--- End quote ---
That's not how I understand it from the Parts List Trig.
This is the text from the 350/4 Parts List:

(Attachment Link)

So up to engine number 1068969 there were 8 seals (for inlets and exhausts) then from engine number 1068970 there were only 4 (inlets only).
Not sure what the 2000000 series engine numbers are, a different market maybe?
The 400/4 Parts List also only lists 4 (inlets only).
I'm presuming that the 350 manual was put together in the early days which is why the diagram text shows 8 seals.

--- End quote ---

So the 350 f0 has 8 seals and the f1 has only four, does anyone know how many 350s were made?

Chris400F:
Just looked at the Parts list again in case I had missed something (I had ....).
Quantities in the left column are for the F (F0?), those in the right are for F1.
So it looks as if F engine numbers were 106xxxx, F1 were 200xxxx.
Not sure if that actually helps though!

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