Once the cylinder head was removed it was clear that the head gasket had failed in the past and allowed oil and/or water to contaminate one or both cylinders. Yanmar motor & transmission as removed, August 2018 We were committing ourselves to doing the overhaul and getting it running again in Carlos’s suburban garage. As parts were removed, they were placed in poly bags or plastic tubs and marked with a description.īeing a marine diesel engine, it weighs a lot more than a similar gasoline motor so our ability to pick it up and take it to specialized machine shops was pretty well nil. At every step, I photographed the steps in hi-resolution as a record of what was done and to act as a guide during re-assembly. Being Japanese, we had to first buy a set of metric sockets and wrenches before proceeding.
YANMAR 2GM COOLING PUMP MANUAL
Thanks to the power of E-Bay, Carlos has found a copy of the original mid-70’s Yanmar service manual so I did not feel entirely alone. I took the decision to strip the entire engine down, examine what we found and if nothing untoward was seen, reassemble it using new parts where applicable. So, it was not seized but that was all we knew. Once secured to an engine stand in Carlos’s garage, the first test was to determine if it would turn over by hand yes it did. Oh, don’t worry about that big hole in the tarp the next day we used the platform to put a new, custom made, heavy duty tarp over the frame. At any moment we were expecting something to snap or the platform to collapse and send the whole thing through the deck… Success and one big sigh of relief! Lifting out the engine and transmission.Ĭautiously, we slowly lifted it up from the engine well, through the companionway, (it cleared by inches) and over the hull to the ground below. By our extremely rough calculations we had a 450lb load on a 500lb crane, (plus an 6ft extra boom to complicate the math!). The plan was to set the hoist as close to the boat as possible but on the day we found a newcomer had parked their boat beside ours so we had to extend our boom using a handy fence post from a nearby landscaping truck. As can be seen, the boat is covered by a framed tarp so the lift had to clear that before it could be set down.
YANMAR 2GM COOLING PUMP PORTABLE
With the boat now firmly on dry land, the removal was done using a portable hydraulic work platform as a crane to lift out the 450lb, (200kg) engine and transmission. So, the first step was to remove the engine from the boat and get it examined.
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There were no signs of oil leaking from the engine or transmission which again was a promising sign. But at least it was intact and had not suffered from some long-ago, half-started repair. On first inspection, the engine looked to be in poor condition with evidence of water coolant leaks and severe corrosion on much of the block and ancillary parts.
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When the boat was purchased, it was stated that the engine had approximately 1500 hours running time but nothing else was known.
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Although this model has changed over the years, spare parts are available and serviceable units still command a good price. These trusty engines are good little workhorses and can be found in numerous applications in addition to offshore power. The boat is fitted with a 20 horsepower Yanmar 2-cylinder diesel engine, model 2QM20, coupled to a Kanzaki transmission.