For example, even the smallest Yanmars can be bored 0.25 and 0.5mm oversize without affecting the integrity of the cylinder wall. Some of these motors had survived 20 years of constant use and with regular maintenance could survive another 20 years.īut providing the cooling water passage zinc anodes have been replaced when needed and oil and filter changes performed at recommended intervals, there's no reason why modern engines with their integral dry cylinder liners can't be rebuilt.
#Rebuilding a yanmar 8 hp marine engine series
In fact, so reliable was this series that my local Yanmar dealer, Minards Marine, recently told me it was not uncommon for it to rebuild commercial fishing motors from Tonga and other Pacific Island nations that had been handed down from father to son, etc. The engines had traditional engineering features, such as large diameter bearings and wet cylinder liners, which eliminated the need to re-bore the cylinders. Discontinued a couple of years ago after a 50-year run, these relatively slow-running (1800-2200 revs) naturally-aspirated and raw-water cooled diesels developed 20-25hp in twin-cylinder form, 35-38hp in three-cylinder form and around 45hp with four cylinders.
Providing a marine engine has been correctly propped according to the loads encountered and maintained according to the manufacturer's recommendations, there's no reason why it can't be rebuilt at least a couple of times.
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