Changing the coolant on a Yanmar 2GM

[Kevin13713]

I own a H320 and am changing the coolant for the first time. The existing coolant has about 100 hours on it and is about a year old. I have a Yanmar 2GM. The Yanmar manual is less that descript regarding everything that needs to get done to accomplish the change (e.g. how to fully drain the system, flush it, etc). Can anyone with the experience give me a high level walk through on what to do?

 

[Don]

Procedure

is easy to do but not that easy to explain. Check the archives here as well as the Yanmarhelp site for detailsDon

 

[Ken Sturgill]

Extended Life Coolant

Make sure you you use the recomended extended life coolant. You can't use Prestone or any other car type coolant, but you can find the extended life in most auto parts stores, Cheveron and Texaco extended life or long life coolant are what my mechanic told me to look for. I bought the premixed 50/50. My mechanic told me to drain the system then fill with water run it on a weekend trip then drain again and fill with the premix coolant. I also had to replace the plastic drain cocks, Yanmar has redesigned the cocks and made them brass, the plastic just doesn't do well. I noticed a pool of coolant in the bildge, the mechanic told me it was the old style cocks, he ordered up the new cocks. I also had to remove the fuel pump and replace the gasket, which was around a $1.00.