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About lazyboy

  • Birthday 07/06/1958

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    marine diesel engines

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  1. The overheating issue was never resolved with the 4LE1 Isuzu 55 marine engine. The industrial version of the 4LE1 that were fan and radiator cooled as in a Generating set or wood chipper were absolutely fine in service. It was just the marine version of that particular engine model that experienced constant cylinder head gasket failures due to overheating. The only solution that HMI came up with was to change the entire engine for a newer version, the Isuzu 4LE2 and market that as the Isuzu 55.
  2. A hire fleet operator had Isuzu 55 engines that were overheating and causing cylinder head issues throughout their fleet. HMisuzu tried to put the fault back with the fleet operator claiming their skin tanks were to small. This was proven not to be the case. HMIsuzu were unable to find a solution to the engine failures. The hire company became very dissatisfied and claimed the Isuzu 55 was not fit for purpose and threatened to take legal action if the issue was not resolved. HMIsuzu replaced under warranty every Isuzu 55 engine (4LE1) in the fleet with an Isuzu 42 (4LC1).
  3. HMIsuzu abandoned the marine market because their biggest customer at that time stopped building narrowboats. Liverpool boats had an annual demand of 400 Isuzu marine engines. Liverpool boats then became Collingwood boats with a annual requirement estimated to be about 80 engines per year. This left HMisuzu with a huge quantity of stock engines and a greatly reduced market in which it could sell them.
  4. The Isuzu 55 engine with known cylinder head problems is a marinised version of the industrial 4LE1 engine.
  5. Your Isuzu engine would of been originally supplied with Trelleborg Cushyfloat mounts. The same size mount was used on the Isuzu 35, 42 and 55 models. It looks like the outline of the old mounts is still visible in your pictures.
  6. lazyboy

    Isuzu paint

    Boots blue, as in boots the chemist. available from a company called Cromadex who supplied the original paint to HMIsuzu.
  7. lazyboy


  8. It may be that the governor lever is sticking. On these engines the four fuel pumps are connected within the crankcase by a steel rack. When you stop the engine the governor rack is pushed forward toward the end cover to the stop position. It is possible that when re-energising the start solenoid the stop/run lever falls to the start position and the engine goes through its start up sequence but the governor rack has not moved and remains in the stopped position. This then stops any fuel going to the pumps and injectors. As the engine is cranking the governor lever eventually falls open and fuel flows.
  9. The build number 02 is a Lister standard variable speed code number.In this particular engine that was the criteria used to ensure that the engine passed a specific production test. This would have been a series of dynamometer measurements taken at full load after the engine had completed a 45 minute staged running in process. For this particular engine that would have been 13.4kw @ 3000rpm. Only after completing and passing the standard production test (LS81) could the build 9 (LS145 procedure) be implemented. This would have been a set of instructions for the final speed and governor settings that were specific to that engine. That particular engine started its life as an industrial special build.
  10. 410061LPW2A902 The number 9 means the engine was a special build. The 02 means the engine was originally built and tested as a variable speed with a 100% maximum power setting of 13.4 kw @ 3000rpm. After the completion of the standard dynamometer production test which was known as the LS81 there would of been specific instructions (build 9) for final speed and torque governor settings for that engine. It certainly was not built as a marine propulsion engine as it would of had a designated build number beginning with a 4
  11. During my four years working for the HMIsuzu mariniser in Gloucestershire,changes were not made to Speed settings or governed torque output after marinisation. The engines were as set by the Japanese manufacturer to their published torque output figures for industrial engines.
  12. The black paint is the original engine primer sprayed to the cast metal surfaces by Isuzu. The primer sprayed on by the mariniser was a product called barcote.
  13. benford or thwaites construction machinery had yellow listers
  14. The original factory fitting should of included loctite thread retainer and a flat plain washer on each bolt. How old is the engine/gearbox.
  15. Isuzu 70 marine engines were marinised from two models of automotive engines. These are 4JG1 PK and 4JG1 PV. Filters were interchangeable with both models. I believe the automotive variant engines were possibly used in isuzu trooper 4x4.
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