Good point. I will certainly check the isos closer. The vibration was noted as normal. I’m Not sure what you mean by the shaft log height and how that plays into vibration at idle.
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Thread: MAN R6 800's 38 Cabo
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11-23-2021 06:39 PM #1Registered Member
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Re: MAN R6 800's 38 Cabo
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Re: MAN R6 800's 38 Cabo
As the mounts settle, the shafts get a lil lower in the logs also.
Pending your log gland type, you may see the log hose tilting down and find the shaft just touching (dancing with vibration) on the log tube, forwarding a read hard vibration into the boat.
Yes, it happens.
Putting in gear and applying torque to the engine, may rock it over a little and the shaft does not dance on the shaft tube bottom.
Yes, this happens also.
Pending the mount, some of the mounts have a height reference built in. Others may need the mfg spec to check height.
vibration was noted as normal
Noted by a real MAN rep?
Did the supposed MAN rep measure the mount heights? They don't usually but if the vibration was questioned during survey, he may have checked.
Of course, I'm not there and just throwing ideas at you. It could be just normal and you need to just go fishing.
What part of the world are you in?Last edited by Captain Ralph; 11-23-2021 at 09:49 PM.
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04-17-2022 05:55 AM #3Registered Member
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Re: MAN R6 800's 38 Cabo
Just a quick update. I emailed Sound Down, (Distributor for Rubber Design Mounts). They actually had some old data showing the model TT2 isolator model at Durometer of 70, "which I have" was too soft when paired with the R6 Engine which caused excessive vibration at idle. They switched to a durometer of "75". I ordered and received 8 of these. Engines are currently blocked up and getting switched out to the 75's. I will update this thread after a sea trial in late May.
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04-17-2022 07:03 PM #4Senior Member
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Re: MAN R6 800's 38 Cabo
Super great of you to follow up on the forum! This is why it works...many thanks!
DAN
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04-19-2022 07:02 AM #5
Re: MAN R6 800's 38 Cabo
Another possible contributing factor, is the engine is running in "half" mode? I have 8v92's electronically controlled and just recently learned the engine runs in half mode at low RPM. In my case half mode, is half of the V (4 cylinders) as it was explained to me. It does sound a little odd with additional vibration until its bumped up to about 700rpm, exits half mode, and enters full mode on all 8 cylinders.
Last edited by Hat52MY; 04-19-2022 at 07:34 AM.
Best regards,
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David
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08-23-2022 08:13 AM #6Registered Member
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Re: MAN R6 800's 38 Cabo
TT2 / 75 Isolators installed and made a major improvement with vibration.