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Had a Rocker Fail

Old 08-09-2020, 09:04 PM
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Default Had a Rocker Fail

My luck - had a Rocker fail. 2.5 hour cruise home on one motor. Naturally, the motor with Power Steering.....

3600 RPM, just cruising along and BANG. Motors probably only have 25 hours on them. Any thoughts other than just pure bad luck?

(Actually, I feel pretty lucky since there doesn't appear to be any damages other that the clean break on the rocker)




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08-24-2020, 08:19 PM
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So thought I'd just throw this out there as an update in case anyone is ever searching, but quite a few of the adjuster nuts were WAY over-torqued by my estimation. Didn't see any other noticeable signs of damage on any other rockers. I did note that almost all of the adjusters we're about 2.5 turns out but the recommended range is 1/4 - 2 turns.

Anyways, back together and back on the lift, hopefully to see out the summer...... Little guy getting some driving time in......


Old 08-09-2020, 09:15 PM
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Jesel's?
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Old 08-09-2020, 09:17 PM
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Yes.....
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Old 08-09-2020, 09:18 PM
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25 hrs on the rockers also? They do have a life span. Aluminum fatigues vs steel. I've seen a couple Jesel rockers broken like that, but they were pretty old and decent amount of spring pressure.
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Old 08-09-2020, 09:26 PM
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I've got to go back and double check the receipt, but I believe the rockers were brand new in the build......
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Old 08-09-2020, 09:29 PM
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solid cam?
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Old 08-09-2020, 09:31 PM
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Solid roller
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Old 08-09-2020, 09:34 PM
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Might want to check another cylinder to see if you’re getting into Coil bind or something stupid…
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Old 08-09-2020, 09:40 PM
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I'll have a look, but these are Sonny Leonard built motors so I can't imagine that's an issue. Not exactly a backyard mechanic......!
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Old 08-09-2020, 09:41 PM
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Originally Posted by sailtexas186548 View Post
Might want to check another cylinder to see if you’re getting into Coil bind or something stupid…
Wouldn't that have happened sooner than 25 hours? Those Jesel rockers just suck. I've had a bunch of them break on a previous boat... with hydraulic lifters. The other engine in the boat (new build) had the same cams and lifters and Crane Golds. No issues...
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