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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