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Old 24-07-2013, 04:14   #1
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Yanmar 4JH5E Injection Pump Failure

I recently installed a new Yanmar auxillary 4JH5E 54bhp engine (this is a new model) and after 81 hours the injection pump breaks up internally. The part that broke is the size of a US quarter but thicker and regulates the flow of the diesel to the injectors. Would like to hear from anyone who has this engine about their experiences so far.
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Old 24-07-2013, 04:31   #2
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Re: Med Cruising

It is a very common engine that has been around for a while. (The model designation has been changed over the years, but the changes to engine itself has been minimal). It is also very similar mechanically to the turbo charged variants.

It is generally regarded as as one of the most reliable engines with a good record.

Faults to the high pressure pump are on any marine diesel engine are quite rare. I assume it will fixed under warranty and its not a fault I would be concerned about reoccurring.
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Old 02-04-2014, 08:57   #3
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Re: Yanmar 4JH5E Injection Pump Failure

Quote:
Originally Posted by gmthompson99 View Post
I recently installed a new Yanmar auxillary 4JH5E 54bhp engine (this is a new model) and after 81 hours the injection pump breaks up internally. The part that broke is the size of a US quarter but thicker and regulates the flow of the diesel to the injectors. Would like to hear from anyone who has this engine about their experiences so far.

Hi, this is Karl on Sailingcatamaran Zoe.
We built in 2 new yanmar engine 4JH5E in 2013 same type as you. one of the engines stopped 10 month later. a small prart of the distributer poston broke in the injectionpump. The local dealer (TESA in Panama) do not like to change it in warranty.
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Old 02-04-2014, 16:07   #4
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Re: Yanmar 4JH5E Injection Pump Failure

Karl,
Thanks for your reply. My problem happened last August and Yanmar, flying in the face of French consumer law, are still not taking any responsibility. It appears to me that there is a design fault in the injection pump which allows minute quantities of water to build up into the injection piston system and when sufficient quantities build up the 'quarter' size metallic fuse splits rendering the injection pump useless. Where the water comes from is a mystery. It is so minute that it could be the assembler's perspiration or just condensation from the trapped humidity inside the piston area when it was manufactured. In my case there was no evidence that the oxyidation formed by the water droplet had any sufficient salt in it to indicate it came from the sea. A further question arises in that since this part of the pump system is closed off from the pressure injection system itself, how could water ingress to the cause the malfunction?
I would like to hear from other owners that have had this problem in this forum as we may not be alone. Yanmar's steadfast refusal to honour a 2 year guarantee makes me even more suspicious that they are trying to hide something.
Do you any photos to share of the broken part or parts? What was their reasoning for not honouring the guarantee?
I certainly feel that I have been 'pistoned' myself (to use a polite term) and very unfairly treated. It is not the way to run a company such as Yanmar is!
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