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Old 04 April 2015, 16:03   #1
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Yamaha 420 inboard diesel

Anyone know of a supplier of Pistons or other parts for Yamaha 420 inboard turbo diesel 245hp.
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Old 05 April 2015, 03:38   #2
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Pistons probably weren't made by yamaha as its a Toyota block, would suggest you go to a engineering company or show one to toyota


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Old 05 April 2015, 05:50   #3
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I don't. You may find this interesting however: Yamaha ME420STI Sterndrive - Diveworks Charters, Fishingdownunder, Whakatane, New Zealand
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Old 05 April 2015, 06:19   #4
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This seems to be a normal misconception. Block casting is Toyota but machined by Yamaha to suit their slightly smaller Pistons which have numerous bore grades and compression heights which are coded on crank and rods. Standard Toyota Pistons last about 1 hr due to extremely high compression ratio and boost.
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Old 05 April 2015, 07:44   #5
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Quote:
Originally Posted by Paddyd51 View Post
This seems to be a normal misconception. Block casting is Toyota but machined by Yamaha to suit their slightly smaller Pistons which have numerous bore grades and compression heights which are coded on crank and rods. Standard Toyota Pistons last about 1 hr due to extremely high compression ratio and boost.

I don't mean this in a nasty way but how do you machine for a smaller piston, the block isn't liners, neither yamaha or Toyota make there own Pistons, just like the rest of the bits on the engine, injector pump for one, turbo as well, you've got to find where they used to buy them from, the compression isn't the problem, it's the bigger turbo


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Old 05 April 2015, 09:49   #6
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Yamaha 420 inboard diesel

The engine block is built up by Toyota 1hdt 12v / 1hdft 24v Yamaha supply Toyota with the Pistons an rings an big end bearings that's it the rest is Toyota . The engine block in then shipped to Yamaha to be marinised .The bores size are the same an grading A,B,C . All the engines iv striped an rebuilt have been b . The crank mains an big ends are graded 2 . By taken number of the crank ladder an the crank an added the numbers to get the right shell . But to be honest if an engine has done 1000hrs the crank an the bores are worn which means the grading is out the window .
Pistons (forged) have to be Yamaha (ART) an the rings due to the high boost pressure .The rest ie shells can be a good quality aftermarket make . Hope this helps
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Old 05 April 2015, 10:37   #7
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My understanding is that "a certain N Ireland boatbuilder", not a million miles away from Cushendall, has a whole stock of bibs and bobs for Yamaha engines.

You could try asking one of our moderators for his phone no.
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Old 05 April 2015, 11:48   #8
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I think he would have volunteered his services by now surely


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Old 05 April 2015, 12:10   #9
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The Pistons are not that expensive from Yamaha now they used 500 or so plus vat but the last batch I bought was around 250 inc vat . Still a rip off
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Old 05 April 2015, 12:10   #10
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That's each
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