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Old 07-13-2018, 04:52 PM   #1
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“Clacking” noise on SP 135

Does it ever fail that when you’re getting ready for a trip things start to break? Hopefully, this isn’t one of those times. There’s a “clacking” noise coming from the rear of our starboard Lehman. It’s not as loud as a knocking rod bearing, but seems a bit louder than “normal” valve noise.

It seems to come from the extreme rear of the engine—by the flywheel (if there is one). I did just change the oil and it only took about 12 quarts to reach the high level on the dipstick (vs the 14.5 quarts American Diesel recommends). So maybe it’s low? When I shutdown and restarted, it seemed to be noticeably quieter. The port engine has no similar noise.



Any thoughts?
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Old 07-13-2018, 05:02 PM   #2
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How many hours on the damper plate? Those have a definite lifespan, are between the engine and transmission and can make quite a racket if one or more springs are broken. On the plus side they're pretty straightforward to change and not too expnsive.

Ken
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Old 07-13-2018, 05:07 PM   #3
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Beat me to it.
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Old 07-13-2018, 05:08 PM   #4
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How many hours on the damper plate? Those have a definite lifespan, are between the engine and transmission and can make quite a racket if one or more springs are broken. On the plus side they're pretty straightforward to change and not too expnsive.

Ken
Each engine has about 3,400 hours if you can believe the meters. If it’s a damper plate, what’s the harm in running it that way?.
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Old 07-13-2018, 05:08 PM   #5
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How many hours on the damper plate? Those have a definite lifespan, are between the engine and transmission and can make quite a racket if one or more springs are broken. On the plus side they're pretty straightforward to change and not too expnsive.

Ken

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Old 07-13-2018, 05:16 PM   #6
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Each engine has about 3,400 hours if you can believe the meters. If it’s a damper plate, what’s the harm in running it that way?.
I suppose it depends on the type. Some fail open, meaning no go, some fail with just no damping meaning more wear on the transmission gears. Some fail into pieces and jam and stall the engine.

Of course it's anybody's guess even if you knew it was the damper - how much longer it may last.

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Old 07-13-2018, 05:34 PM   #7
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Thank you, Kan and all.

I guess my real question is whether the noise is an indication of inevitable failure or “must repair”?

Edit: Oops, reading closer, I see you answered that.
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Old 07-13-2018, 05:55 PM   #8
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Just hope it isn’t cylinder#6 scuffing. Much rather it be a damper plate.
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Old 07-13-2018, 05:59 PM   #9
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My dampener went 100hrs and over 600 miles between first clacking sounds and failure to locking up the flywheel stalling the engine...15 miles from home but in some lousy sea conditions.

Hope to never repeat it.... An easy job if you have decent access at the rear of your engine.
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Old 07-13-2018, 06:04 PM   #10
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My dampener went 100hrs and over 600 miles between first clacking sounds and failure to locking up the flywheel stalling the engine...15 miles from home but in some lousy sea conditions.

Hope to never repeat it.... An easy job if you have decent access at the rear of your engine.
Thanks, Scott. Please define “easy.”
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Old 07-13-2018, 06:05 PM   #11
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Just hope it isn’t cylinder#6 scuffing. Much rather it be a damper plate.
Fingers and toes crossed.
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Old 07-13-2018, 06:06 PM   #12
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Just hope it isn’t cylinder#6 scuffing. Much rather it be a damper plate.
The #6 scuffing is a 120 problem.
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Old 07-13-2018, 06:09 PM   #13
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Just a lot of bolts to take off and put back....no adjustments really unless you feel the need to realign the engine afterwards.

As long as you can get there and slide the tranny back a few inches...and support it.

If your rear engine mounts are on the tranny, different story.
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Old 07-13-2018, 06:49 PM   #14
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Just a lot of bolts to take off and put back....no adjustments really unless you feel the need to realign the engine afterwards.

As long as you can get there and slide the tranny back a few inches...and support it.

If your rear engine mounts are on the tranny, different story.
That doesn’t sound too bad. No mounts under the tranny and ample access (thank you, Art). Still, I’ll probably have a pro do it. Too many other chores and it would take me days to do something a pro could do in hours.
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Old 07-13-2018, 06:55 PM   #15
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While I had my tranny off, I took it for a checkup, flush, new front and fear seals
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Old 07-13-2018, 07:55 PM   #16
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Each engine has about 3,400 hours if you can believe the meters. If it’s a damper plate, what’s the harm in running it that way?.
The dampers on Lehmans are rated for 2,500 hours. If the springs break they can drop down in the housing and get jammed such that the engine actually is stopped. IMHO you need to have the dampers replaced in both engines. ANGUS, you know my boat. The repair records that came with the boat, although not complete, did not show that the plates were ever replaced, 5,500 hours on the clock. There was a lot of clattering at idle, an indication that the springs were weak and loose. No way way did I want to be doing "the loop" with those old damper plates. They both got replaced before we left. As I write, we are tied up in Smith Falls, Ontario on the Rideau Canal/ River. No more clattering by the way.
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Old 07-14-2018, 07:03 AM   #17
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One significant omission in my earlier post: this engine had a Twin Disk transmission retrofitted after the Velvet Drive failed. The noise is not coming from the tranny, however, but from the bell housing of the engine. Does this change anyone’s diagnosis?

Anyone know any good diesel mechanics on the extreme upper eastern shore of the Chesapeake? (We’re at Worton Creek, but I don’t know what their availability is going to be.)

Amazing how something I never knew existed can wreck months of planning. I know . . . . plans . . .
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Old 07-14-2018, 07:10 AM   #18
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How many hours on the damper plate? Those have a definite lifespan, are between the engine and transmission and can make quite a racket if one or more springs are broken. On the plus side they're pretty straightforward to change and not too expnsive.

Ken
Will the boat have to be pulled? I imagine a fair amount of water gets in if the shafts have to be slid back.
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Old 07-14-2018, 07:28 AM   #19
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No, shouldn't have to pull the boat, any shaft leaks should be minor if it can't be adjusted to none.
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Old 07-14-2018, 08:30 AM   #20
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If your shafts can be slid back about 4" or so it's enough.
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