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Old 03-03-2016, 14:41   #1
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2QM20 yanmar

ok have one that's a great runner and want to keep it that way, noticed the rocker oil feed pipe has corroded where it passes under the exhaust not yet but pretty deeply pitted, question is, is copper ok to replace this section.. welded using eziflow as having a bit of fun sourcing steel tube this size (5mm) and 1/4" copper should sleeve over ok.....thoughts anyone?
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Old 04-03-2016, 04:21   #2
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Re: 2QM20 yanmar

Seems a common problem, I think I remember 3 or 4 threads about it in the last year or so.

Don't know what eziflow is, so I can't comment on it as a way of connecting copper to steel.

As far as replacing the line with copper and brass fittings, I wouldn't have any problem with it, as long as the line is attached to the engine so that it vibrates in concert with the engine. Copper line will work harden and crack from vibration.

In the past when I've heard about this, I always wondered why people who have this problem don't just go to braided stainless. Something this small could probably be had for less than Yanmar wants for their not-so-good steel line. Plus they look cool.

Stainless lines are readily available, from hot rod parts stores and industrial instrumentation suppliers. A quick online search yielded this superduty 1/4" braided steel line, 18" long with 1/4" NPT male threads for 27.83...

1/4 In T321 SS Annular Corrugated Metal Hose Assembly With T304 SS Single Braid, AF4750

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Old 04-03-2016, 05:00   #3
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Re: 2QM20 yanmar

i knew that hose as aeroquip hosing in sporty car racing. good stuff. want to convert to this with my boat.
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