Manufactured 1985 - 1989
I have a 4JH-2E manufactured in 1994 with 2850 hours on it and it is running like a top; smooth, clean, lots of power, no smoke, starts instantly.
I am from the Pacific NW where thousands of commercial
fisherman run boats with one or two Yanmar
engines (usually six cylinder). My mechanic
up there maintained hundreds of them and said a Yanmar will run forever if it gets:
- clean air
- clean fuel
- regular oil
and is run hard and hot at least every ten-hours.
He said 10,000 hours was easy on a Yanmar.
You could get an oil
analysis done and have an experienced Yanmar guy go thru the engine
checking for problems. The following are the major problems I know about in the 4J2E line (1989 thru 1999):
- coolant water pump
needs replacement every 2,000 hours or so
- exhaust elbow
is very prone to clogging and can damage the heat exchanger
(parts to repair my system were $2,200 at 2600 hours and I did all the work
- motor mounts are prone to breakage and sometimes the sheared bolt is hard to detect
- the oil heat exchanger
is hard to see and inspect and can leak coolant
I'd have no concerns about a 30-year old Yanmar 4 series IF I knew the operational history