89 mid cabin bad valve lifter noise

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mrrudely
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89 mid cabin bad valve lifter noise

Post by mrrudely »

the boat has twin 454's
port engine developed what seems to be a lifter noise
mechanic did a compression check and found number 8 at 50psi
all the rest were good
he thinks burned valve because of bad gas
we bought the boat after it had been sitting for at least 5 years
did compression check then and all cylinders were good
pumped some old gas out day one and have since put some fresh gas in so whatever was old had been diluted
we have put less than 100 hours since purchase
any thoughts?
lifter noise just a coincidence or result of a sticking valve?
thx
10 meter mid cabin
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prowlersfish
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Re: 89 mid cabin bad valve lifter noise

Post by prowlersfish »

Sticky valve , bent push rod or broken spring come to mind .
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
mikeandanne
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Re: 89 mid cabin bad valve lifter noise

Post by mikeandanne »

Have your mechanic do a proper leak down test on #8, that will tell you what is leaking.
mrrudely
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Joined: Sat Jun 08, 2019 11:52 am
Location: Marina Del Rey, CA

Re: 89 mid cabin bad valve lifter noise

Post by mrrudely »

can bad gas burn up a valve in less than 30 hrs?
10 meter mid cabin
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prowlersfish
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Re: 89 mid cabin bad valve lifter noise

Post by prowlersfish »

Not likely . Under High load , running lean maybe . A valve that slightly leaks can burn . A slightly sticking valve , a weak or broken spring can cause a valve leak then burn .
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
mrrudely
Sporadic User
Posts: 180
Joined: Sat Jun 08, 2019 11:52 am
Location: Marina Del Rey, CA

Re: 89 mid cabin bad valve lifter noise

Post by mrrudely »

turns out to be a stuck valve in #8
causing a bent push rod
10 meter mid cabin
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prowlersfish
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Posts: 12645
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Re: 89 mid cabin bad valve lifter noise

Post by prowlersfish »

Thanks for the update . Glad you found the issue .
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
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