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Old 21 March 2016, 04:36   #1
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So, whats this part for on a rebuild?

Hi all I'm just finishing a rebuild on my 1992 30hp yam/mariner 689 2 stroke and 1 bit has me stumped. (see photo) it looks like either a breather or non return valve connected to the fuel system but I don't have any spare pipes left over or bits missing from my strip down. I also can't find any info on line. Any suggestions? its the silver thing! [/URL][/IMG]
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Old 21 March 2016, 08:18   #2
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Oil injection pump? Did it previously have a pump that has subsequently been removed & the engine now runs on premix?
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Old 21 March 2016, 09:55   #3
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I wonder is that engine ex-RNLI? Could it be a drain for post inversion fuel draining?
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Old 21 March 2016, 11:17   #4
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God knows. Bought it off ebay last year and it started off ok but showed signs of wear. After stripping it down the lower piston had signs of lack of oil. So rebore, skimmed and checked evening and then this little beauty is just sitting there. The powerhead is connected to the oil pump (manual) and the oil pump is connected to the oil tank
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Old 21 March 2016, 13:29   #5
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on a bit more investigation I wonder if its a fuel check valve, if it is it looks like it justs goes to air?
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Old 21 March 2016, 15:04   #6
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Would barras know they use to supply the RNLI I believe with mariner engines
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Old 21 March 2016, 15:51   #7
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Sorted it now, its the non return valve from the oil pump back into the fuel system. There must be some pipes somewhere! Cheers all. Can't wait to get it on the water again
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