Dave, I think it is very reasonable to do the work yourself. Having recently rebuilt my 3QM30, I would expect the cost to be about $500 or less. My whole rebuild was under $2,000.
Bring the head to a machine shop and have them check it out, acid dip & clean, resurface if needed, and do a valve job. The exhaust valves are usually pitted, and since they cost about $10 each, I would just purchase new Yanmar exhaust valves along with the Yanmar valve seals(which are a better quality than the bulk seals many shops use). With regards to the injectors, your may be fine, and if not you can always replace them easily at a later time. But while the injectors are out you can take them to a truck diesel repair shop and have them tested. My local shop did this free of charge, and all three of mine were fine. Also, you can save a fair amount of cash by buying Yanmar parts from a tractor supply. For example, Mastry Marine (Yanmar marine of the south east) wanted over $1000 for a new set of pre-combustion chambers which I was able to get for about $200 online at Hoye Tractor(just put in the Yanmar part number into their search page) . Here is a link to my blog where the 3QM30 rebuild is described. http://svjohannarose.blogspot.com/search/label/EngineWork I have the 3QM30 service manual, and even more helpful, I have the 3QM30 parts catalog. Let me know if you need either one. - Paul E. 1981 C&C 38 Landfall S/V Johanna Rose Carrabelle, FL http://svjohannarose.blogspot.com/ > On Sep 8, 2016, at 4:48 PM, cnc-list-requ...@cnc-list.com wrote: > > Date: Thu, 8 Sep 2016 14:40:32 -0400 > From: David <davidrisc...@msn.com <mailto:davidrisc...@msn.com>> > To: CNC CNC <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> > Subject: Stus-List 3QM30 Head Gasket > Message-ID: <blu174-w37d4ff9b05b292f36eb400da...@phx.gbl > <mailto:blu174-w37d4ff9b05b292f36eb400da...@phx.gbl>> > Content-Type: text/plain; charset="iso-8859-1" > > So...we are leaving harbor to make our way down to Mystic for the > Rendezvous. As I usually do I turn around and check the exhaust for water > and color. > > Today the color as darkish grey and it looked like oil was coming out as well. > > I do an immediate 180 and go back to the mooring. > > Mechanic is out within the hour and confirms my suspicions. Head gasket. To > do the job right (injectors, planing head etc) he estimates $2,500 to $3,000. > I think the price is fair but I wonder if I could do it myself. Anyone > have any experiences around this? I am a fair mechanic, but I don't want to > be penny-wise of pound foolish and I have never done anything like this > before. > > Thanks in advance... > > > > David F. Risch > 1981 40-2 > (401) 419-4650 (cell) >
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