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Author Topic: Vibrations  (Read 2141 times)
rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« on: April 09, 2010, 06:22:45 PM »

OK Dallas, Here's one for you.

My 8-92t vibrates in neutral at any rpm. It has done this since I dropped a valve last year. My 92 is 440hp and the shop that worked on it put a head and piston from a 450+hp 92. A tune up has been done and it runs great, no smoke, but seems to vibrate more under acceleration,(load). Any Ideas?

Richard
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Just Dallas
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« Reply #1 on: April 09, 2010, 06:30:08 PM »

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« Last Edit: July 15, 2010, 02:37:53 AM by Now Just Dallas » Logged

I'm just an old chunk of coal... but I'm gonna be a diamond someday.
rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #2 on: April 09, 2010, 06:41:04 PM »

Your gonna make come see you, huh?
Richard
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compedgemarine
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« Reply #3 on: April 09, 2010, 06:53:35 PM »

I am sure Dallas knows the problem but my first question would be are the piston and rod weights the same? if the only moving part changed was one cylinder then it sounds like an imbalance.
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rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #4 on: April 09, 2010, 07:02:08 PM »

Could be. I'll probably have to pull the head and put anoyher piston and sleeve.
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Just Dallas
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« Reply #5 on: April 09, 2010, 07:30:34 PM »

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I'm just an old chunk of coal... but I'm gonna be a diamond someday.
rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #6 on: April 09, 2010, 07:35:58 PM »

When is Dennis coming to see you?
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luvrbus
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« Reply #7 on: April 09, 2010, 07:37:39 PM »

Dallas will get to the bottom of it but sounds like someone tried to adjust the valves with the valve bridge adjustment or did not not adjust the bridges before installing the rockers probably has a burned valve by now or he may need one of the high dollar harmonic balancers the 8v92 uses.  


good luck
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rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #8 on: April 09, 2010, 07:42:34 PM »

Thanks Clifford, Just what I wanted to hear...
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bryanhes
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« Reply #9 on: April 09, 2010, 07:43:43 PM »

Richard,

Is that worse than a differential  Cheesy  Grin

Bryan
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rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #10 on: April 09, 2010, 07:51:15 PM »

MUCH!!!!
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bryanhes
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« Reply #11 on: April 09, 2010, 07:55:25 PM »

If it wasn't for bad luck lately you might not have any  Undecided
 
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Dreamscape
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« Reply #12 on: April 09, 2010, 08:07:42 PM »

Keeps him out of trouble and on his toes! Grin
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luvrbus
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« Reply #13 on: April 09, 2010, 08:10:03 PM »

Bryan, it not a big deal for Richard he has had that engine out so many times from the 7  I am beginning to think he has Velcro or zippers on it lol call me if you need parts Richard I have some extras


good luck
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rdbishop
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'68 MCI-7 892T, 740 Richard & Missy - Texas




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« Reply #14 on: April 09, 2010, 08:13:28 PM »

Clifford, you want me to use Eagle parts on a MCI?
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