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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.
Quote from: llessur on January 01, 2017, 07:59:13 PMThat 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.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.
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.
Quote from: Trigger on January 02, 2017, 06:52:14 AMNot 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.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.