I have a Yanmar
3JH40 installed as a repower
two years ago with a ZF15 MIV. One week after the engine
was installed it was shaking at idel( 8 to 850rpm) to the extent that the cpu mounts broke and the cpu fell off. Yanmar
provided new rubber mounts and within 4 weeks the same thing happened. The installation mechanic
said that he felt that the engine
was shaking abnormally although it ran fine throughout its power
range. We sent a video to MacBoring( the engine supplier) . They indicated that they were discussing the issue with Yanmar. The issue was dropped and I, foolishly didn’t follow up. Two seasons pass…the engine has a 3 year warranty. It has developed a transmission
leak at the rear seal which reminded me to follow up with Mac Boring and Yanmar as the shaking at idle never stopped and I suspect that it caused the transmission
leak.( I auxiliary mounted the cpu to protect it from the shaking engine.).
I Pursue the matter several weeks ago and send MacBoring a video of the engine at idle. They speak wit people at Yanmar. Yanmar responds by saying that a shaking engine hasn’t been a recurring problem and they have no bulletins regarding this problem. I may want to consider changing the mounts at my expense.
I am pissed.
First. Just because Yanmar doesn’t regularly hear about this problem doesn’t mean it’s not a problem with this particular 3JH40. The engine is shaking and one can only conclude that some internal issue is causing it that occurred during the manufacture of this particular engine.
Second. While he mounts might treat the problem it doesn’t solve the problem. The boat
doesn’t cause the vibration nor does the drive train since it occurs in neutral no shaft turning.
Third. If the V drive weight necessitates different non-standard mounts Yanmar engineers or MacBoring Engineers should have specified the appropriate mounts in the first place since the engine and transmission were ordered and delivered as a package.
Yanmar is responding by saying there is no problem and we are not going to address the issue or provide any help.
Mac Boring is saying “ sorry Yanmar won’t help but we are willing to sell you new mounts”
Both responses are unacceptable examples of customer disservice.
Responsible companies would:
A. Examine the engines and determine the cause of the shaking and resolve it.
B. If different mounts are needed, supply those mounts with installation
Any other response is a huge disservice and a black eye on both companies.