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Old 03-02-2013, 14:41   #1
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Is it hard to find a used Yanmar block??

I need advise on where to search for a yanmar 3JH4E block. In The US, brand new is about $3200, and after spending lots of money on a overhaul, the block developed a huge crack that can't be repaired (after falling on its side from a stand)... So I ended up with new everything for this engine, and the block surprise! Also, after a huge blister job and electronics update, I find myself in a position where I can't get a new engine, not even a new block. so I need to find a used one, even if it need liners..That shouldn't be a problem, but where can I try to find this?? I did an online search, but nothing... Hope that somebody knows a place with lots of parted out engines, or knows somebody that knows somebody, that knows somebody........ Any help will be really appreciated!
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Old 03-02-2013, 15:00   #2
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Why can't this block be welded ? I've seen some old cat blocks with extensive welding to repair.
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Old 03-02-2013, 15:57   #3
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They say it might be welded, but they can warranty that it will hold strongly.. The crack is about 8" long and goes horizontal about 3/4" from the top of the block. It even goes through two threaded holes for the head retaining bolts and then goes up, ending on the edge, were the head seats... That's why Yanmars are so light.. They are very lightly built in order to save material.... That wall is not even 1/4 thick..... The worst thing is that on the shop, they are friends, and never charge me for any work, so I can't even sue them! LOL
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Old 03-02-2013, 17:04   #4
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What you might try is grinding out a vee in the crack. Then filling with epoxy, this will only work if the crack only goes into the coolant jacket. There is some stuff called Belzona that would work excellent for this, it can be drilled, tapped & machined. Last time I used any was 10 + years ago & it cost $700.00 for the 2 parts total about a quart. Good luck
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Old 08-02-2013, 14:52   #5
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Wow, that stuff is really expensive. Next week I'm taking a block to another shop for a second opinion, and I'm also going to mention that product... Will let you know how it goes..
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Old 08-02-2013, 17:56   #6
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Re: Is it hard to find a used Yanmar block??

There is a guy in the USA that reconditions and remanufacturs Yanmar engines.
hes in Wisconcon.

Ring First Mate Yachting Services in St Augustine and tell them Mark the Australian sent you, and they will give you his phone number... First Mate: (904) 829-0184

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Old 08-02-2013, 21:06   #7
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Hi mark, thanks a lot for the info. Will call first thing Monday morning!!
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Old 09-02-2013, 05:28   #8
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Re: Is it hard to find a used Yanmar block??

Thanks for the info folks. I cracked my block on a Yanmar YSB12 and am looking for options. It is well worth the look at welding / repairing the crack. Have to put on the heavy mittens to take a look as it is winter up here.
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