Keaton85
New member
- Joined
- Aug 10, 2024
- Messages
- 4
- Tractor
- JD X320
Thanks! That's what I figured when I read through this topic, I just wanted to check if I missed something.From what I’ve seen it’s the cheap Chinese clone parts that are inferior. The camshaft material is inferior with improper or no heat treatment. An oem Yanmar cam & bearing may be interchangeable which would solve that problem.
The quality of clone parts varies from terrible to good/great.
Are you saying the crankshaft PTO and rod bearings are wearing also?
90cummins
I actually have a running "8.5Kw" Chinese diesel, and an original Winco 5.5Kw with a Yanmar L100 with unknown hours. This unit I just stripped down was one that did not get enough or probably any oil changes. Thus it has PTO end bearing wear and big end crank bearing wear, also cam fallow wear as well! This all probably caused the poor running, hot exhaust and in turn the dropped valve.
I have thought of either:
- Get a needle bearing with inner race and machine down the end shaft to press on the inner race.
- open up the crankcase bore on the bearing end and get a large ball bearing installed with some machining on camshaft.
- I noticed the Yanmar original camshaft at the gear end actually has a bushing bearing and not a ball bearing. The ball bearing could actually be causing the issue at the small end by allowing more movement. If the big end was changed to a double-row ball bearing that might keep it a bit more "straight".
Last edited: