My four year old 4JH4 HTE has reached 1000 hours. It's running great. No smoke. Doesn't burn oil. Coolant temperatures the same as day 1. Same top RPM as day 1.
While I change oil, filters, impeller, and coolant religiously - everything else is original.
I'm a big believer in "if it ain't broke, don't fix it" when it comes to diesels. I've had my share of Yanmar mechanics who have made things worse by touching the engine. Even one who put a part back on the wrong way around.
So. Are any of these "must do"?
- Replace mixing elbow (again, no sign of overheat. No drips. Full RPM)
- Check injector spray pattern
- Check fuel injection timing
- Adjust valve clearance
- Clean turbocharger
- Replace all water and fuel hoses (I'm not going to do this but the manual says every two years)
While I change oil, filters, impeller, and coolant religiously - everything else is original.
I'm a big believer in "if it ain't broke, don't fix it" when it comes to diesels. I've had my share of Yanmar mechanics who have made things worse by touching the engine. Even one who put a part back on the wrong way around.
So. Are any of these "must do"?
- Replace mixing elbow (again, no sign of overheat. No drips. Full RPM)
- Check injector spray pattern
- Check fuel injection timing
- Adjust valve clearance
- Clean turbocharger
- Replace all water and fuel hoses (I'm not going to do this but the manual says every two years)