1980 SN drivetrain noise |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13510 |
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Posted: October-18-2016 at 6:01pm |
roy
Newbie Joined: December-15-2015 Location: netherlands Status: Offline Points: 4 |
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Hello all,
I have also a late 1980 hull,maybe it is finished in 81. With a 351 ford commander. Can anyone tell me what a cradle is? And the function of it? Greetings roy from the Netherlands |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Tim and Terry, You missed the point Chris was trying to make regarding engine movement. So what it has a cradle. What makes you think the cradle couldn't move? |
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ultrahots
Gold Member Joined: September-08-2004 Location: United States Status: Offline Points: 618 |
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Tim is correct on the cradle vs stringer issue. My 80 makes a Squeal type noise with harder turns in either direction and shaft is perfect.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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That engine isn't moving, '80 has a cradle.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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The noise could be normal, but hard to tell what the intensity is by a text description.
If you haven't already, I would check alignment (should be within .003 ") of the prop shaft to tranny, Also check the strut bearing (shouldn't be any discernable play). Another possibility is weakened stringers. If weak from wood rot, they could be allowing the engine to move during a turn. You can check their health by tapping with a hammer, should have a solid sound. Also check lag bolts to see if they are holding torque. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Matt,
It could be normal. When turning, every boat I've driven makes noises. It sounds like prop cavitation caused by hull harmonics |
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deadsexyii
Newbie Joined: October-05-2016 Location: Kansas City Status: Offline Points: 14 |
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First off, great forum you guys have here. It's clear there's some knowledgeable folks on the site. I've got a new-to-me 1980 SN, 351 PCM. When going straight, drivetrain is silent. However, when turning either port or starboard, there is a significant noise. It is not a squeal like metal grinding on metal. It is a groan like the drivetrain is straining. The harder/tighter I turn, the louder the groan. I do not feel any vibration from the drivers seat but I also haven't ridden in the back.
I am certainly not new to boating but this is my first inboard so I am not sure if this is normal operation or whether I need to be concerned. My first guess is strut bearing but again not sure if this is normal. Previous owner (my uncle) says strut bearing has been replaced but he doesn't remember when. Appreciate the thoughts! Thanks guys. |
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